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Study on Direct Reduction Characteristics of Iron Ore Coal Mixed Pellets 被引量:2
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作者 XUE Zheng-Hang YOU Jin-zhou ZHOU Guo-fan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2000年第2期6-10,共5页
In order to get DRI iron ore coal mixed pellets are reduced isothermally. The mechanisms of reduction desulphurization, iron oxide reduction and the structure regenesis of the coal mixed pellets during reduction have ... In order to get DRI iron ore coal mixed pellets are reduced isothermally. The mechanisms of reduction desulphurization, iron oxide reduction and the structure regenesis of the coal mixed pellets during reduction have been studied. The effect of various processing factors on the quality of DRI and economy technological indices including compression strength, desulphurization rate, recovery rate, reaction fraction, carbon content and metallization are also researched. 展开更多
关键词 iron ore coal mixed pellet DRI reduction desulphurization
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An experimental study on metal precipitation driven by fluid mixing: implications for genesis of carbonate-hosted lead–zinc ore deposits 被引量:3
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作者 Yan Zhang Runsheng Han +2 位作者 Xing Ding Junjie He Yurong Wang 《Acta Geochimica》 EI CAS CSCD 2019年第2期202-215,共14页
A type of carbonate-hosted lead–zinc(Pb–Zn)ore deposits, known as Mississippi Valley Type(MVT)deposits, constitutes an important category of lead–zinc ore deposits. Previous studies proposed a fluid-mixing model to... A type of carbonate-hosted lead–zinc(Pb–Zn)ore deposits, known as Mississippi Valley Type(MVT)deposits, constitutes an important category of lead–zinc ore deposits. Previous studies proposed a fluid-mixing model to account for metal precipitation mechanism of the MVT ore deposits, in which fluids with metal-chloride complexes happen to mix with fluids with reduced sulfur, producing metal sulfide deposition. In this hypothesis, however, the detailed chemical kinetic process of mixing reactions, and especially the controlling factors on the metal precipitation are not yet clearly stated. In this paper, a series of mixing experiments under ambient temperature and pressure conditions were conducted to simulate the fluid mixing process, by titrating the metal-chloride solutions, doping withor without dolomite, and using NaHS solution. Experimental results, combined with the thermodynamic calculations, suggest that H_2S, rather than HS^-or S^(2-),dominated the reactions of Pb and/or Zn precipitation during the fluid mixing process, in which metal precipitation was influenced by the stability of metal complexes and the pH. Given the constant concentrations of metal and total S in fluids, the pH was a primary factor controlling the Pb and/or Zn metal precipitation. This is because neutralizing or neutralized processes for the ore-forming fluids can cause instabilities of Pb and/or Zn chloride complexes and re-distribution of sulfur species, and thus can facilitate the hydrolysis of Pb and Zn ions and precipitation of sulfides. Therefore, a weakly acidic to neutral fluid environment is most favorable for the precipitation of Pb and Zn sulfides associated with the carbonate-hosted Pb–Zn deposits. 展开更多
关键词 METAL PRECIPITATION Fluid mixing Sulfur species MVT lead-zinc ore DEPOSITS Carbonate-hosted lead-zinc DEPOSITS
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Metallogeny of the Baiyangping Lead-Zinc Polymetallic Ore Concentration Area, Northern Lanping Basin of Yunnan Province, China 被引量:5
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作者 WANG Xiaohu SONG Yucai +3 位作者 ZHANG Hongrui LIU Yingchao PAN Xiaofei GUO Tao 《Acta Geologica Sinica(English Edition)》 CAS CSCD 2018年第4期1486-1507,共22页
The Lanping Basin in the Nujiang-Lancangjiang-Jinshajiang (the Sanjiang) area of northeastern margin of the Tibetan Plateau is an important part of eastern Tethyan metallogenic domain. This basin hosts a number of l... The Lanping Basin in the Nujiang-Lancangjiang-Jinshajiang (the Sanjiang) area of northeastern margin of the Tibetan Plateau is an important part of eastern Tethyan metallogenic domain. This basin hosts a number of large unique sediment-hosted Pb-Zn polymetallic deposits or ore districts, such as the Baiyangping ore concentration area which is one of the representative ore district. The Baiyangping ore concentration area can be divided into the east and west ore belts, which were formed in a folded tectogene of the India-Asia continental coUisional setting and was controlled by a large reverse fault. Field observations reveal that the Mesozoic and Cenozoic sedimentary strata were outcropped in the mining area, and that the orebodies are obviously controlled by faults and hosted in sandstone and carbonate rocks. However, the oreforming elements in the east ore belt are mainly Pb-Zn -Sr-Ag, while Pb-Zn-Ag-Cu-Co elements are dominant in the west ore belt. Comparative analysis of the C-O-Sr-S-Pb isotopic compositions suggest that both ore belts had a homogeneous carbon source, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata; the ore- forming fluids were originated from formation water and precipitate water, which belonged to basin brine fluid system; sulfur was from organic thermal chemical sulfate reduction and biological sulfate reduction; the metal mineralization material was from sedimentary strata and basement, but the difference of the material source of the basement and the strata and the superimposed mineralization of the west ore belt resulted in the difference of metallogenic elements between the eastern and western metallogenic belts. The Pb-Zn mineralization age of both ore belts was contemporary and formed in the same metaliogenetic event. Both thrust formed at the same time and occurred at the Early Oligocene, which is consistent with the age constrained by field geological relationship. 展开更多
关键词 eastern Tethyan metallogenic domain Lanping Basin Baiyangping ore concentration area lead-zinc polymetallic ore deposit genesis of deposit
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Study on experiment and mechanism of thermal dissolved sulfuration of low grade lead-zinc oxide ore in lanpin 被引量:2
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作者 Minghua JIANG Bin YANG +2 位作者 Jijun WU Yuchun ZHAI Yang ZHOU 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第4期291-296,共6页
The thermal dissolved sulfuration technology is brought forward and performed based on the characteristic of low grade lead-zinc oxide ore in lanpin. Using sulfur as the sulphidizing agent in the experiment, the oxide... The thermal dissolved sulfuration technology is brought forward and performed based on the characteristic of low grade lead-zinc oxide ore in lanpin. Using sulfur as the sulphidizing agent in the experiment, the oxides in the sandstone and ignimbrite are changed into sulfides. The disproportionation reaction of sulfur in a solution is confirmed as 4S+3H2O=2S^2-+S2O3^2--+6H^+. The dynamics process is studied and the first-order reaction rate equation -1n(1-a)=ktt is obtained. The effects of the reactive products, stirring speed, dosage of sulfuration agent, value of pH and sulphidizing temperature on the sulfuration of oxide ore are investigated. The results indicate that the reactive apparent activation energy is 100.8 kJ/mol and the sulfuration ratio of lead-zinc oxide ore reaches 60% under the conditions of pH 5.9-7.5, the sulfuration temperature of 130 ℃, sulfuration time of 180 min and the stirring speed of 800 r/min. 展开更多
关键词 lead-zinc oxides ore Thermal dissolved sulfuration Sulphidizing ratio Disproportionation reaction First-order reaction
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Recycle of Wastewater from Lead-Zinc Sulfide Ore Flo-tation Process by Ozone/BAC Technology 被引量:3
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作者 Xingyu Liu Bowei Chen +3 位作者 Wenjuan Li Yongsheng Song Jiankang Wen Dianzuo Wang 《Journal of Environmental Protection》 2013年第1期5-9,共5页
Lead-zinc sulphide ore contains lead sulphide (galena), and zinc sulphide (sphalerite). In the first flotation stage, galena is rendered hydrophobic with an organic collector such as xanthate, while sphalerite is kept... Lead-zinc sulphide ore contains lead sulphide (galena), and zinc sulphide (sphalerite). In the first flotation stage, galena is rendered hydrophobic with an organic collector such as xanthate, while sphalerite is kept from floating by depressants, and in the second flotation stage, activator was used to activated zinc flotation. Since the organic regent used are different in the two flotation stage, wastewater from the second zinc flotation stage can’t be directly recycled to the first lead flotation stage. Wastewater from flotation process for concentrating lead-zinc sulphide ore often containing organic compounds such as diethyldithiocarbamate(DDTC), xanthate, terpenic oil(2# oil) and thionocarbamate esters (Z-200), are environmentally hazardous. Their removal from contaminated water and the reuse of the water is one of the main challenges facing lead-zinc sulphide ore processing plants. In this study, synthetic wastewater containing DDTC, xanthate, 2# oil and Z-200 at concentrations ranging from 21 to 42 mg/L was fed into an Ozone/Biological activated carbon (BAC) reactor. Analyses of the effluent indicated a chemical oxygen demand (COD) removal over 86.21% and Total organic carbon (TOC) removal over 90.00% were achieved under Hydraulic retention time (HRT) of 4h and O3 feeding concentration of 33.3mg/L. The effluent was further recycled to the lab scale lead concentrating process and no significant difference was found in compare with fresh water. Furthermore, lead-zinc sulphide mineral concentrating process was carried out at lab scale. The produced wastewater was treated by Ozone/BAC reactor at O3 feeding concentration of 16.7mg/L and HRT of 4h. The effluent analysis showed that TOC removal was 74.58%. This effluent was recycled to the lab scale lead-zinc sulphide mineral concentrating process and the recovery of lead was not affected. The results showed that by using Ozone/BAC technology, the lead-zinc sulphide mineral processing wastewater could be recycled. 展开更多
关键词 lead-zinc SULPHIDE ore Ozone/BAC FLOTATION WASTEWATER RECYCLE
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Application of Tectono Geochemical Study in Deep Concealed Ore Body Exploration--As the Huize Super-Large Lead-Zinc Deposit an exemple 被引量:1
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作者 ZHANG Quan GUO Yuxinyue +1 位作者 PU Chuanjie WANG Feng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第S1期247-248,共2页
1 Geological Background of Minerlization or Geologic Setting The northeast of Yunnan1 Pb-Zn-Ag-Ge polymetallic ore district is an important part of the southwestern margin of the Yangtze block Sichuan-Yunnan-Guizhou
关键词 Application of Tectono Geochemical Study in Deep Concealed ore Body Exploration NE As the Huize Super-Large lead-zinc Deposit an exemple MVT
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Isotope Geochemistry of the Xinchang -Yongjia Silver (Lead-Zinc)Ore Belt in Eastern Zhejiang Province
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作者 Xu Butai, Li Changjiang Zhejiang Institute of Geology and Mineral Resources, Hangzhou, Zhejiangand Chen Haoshou Department of Earth Sciences, Zhejiang U niversity, Hangzhou, Zheyang Liu Xinzhu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1995年第1期69-83,共15页
In the Xinchang-Yongjia silver (lead-zinc) ore belt, there mainly occur the large to medium-sized Haoshi, Bamao, Dalingkou and Wubu silver deposits or silver-bearing lead-zinc deposits. On the basis of researches on t... In the Xinchang-Yongjia silver (lead-zinc) ore belt, there mainly occur the large to medium-sized Haoshi, Bamao, Dalingkou and Wubu silver deposits or silver-bearing lead-zinc deposits. On the basis of researches on these typical deposits, the mechanism of leaching-drawing mineralization of Mesozoic geothermal water and the related model are put forward in this paper in the light of the time interval between rock and formation ages as well as hydrogen, oxygen, sulphur and lead isotope geochemical characteristics. The major metallogenic process occurred in volcanic rock layers. The ore-forming fluids are geothermal water coming from meteoric water and circulating at shallow layers. This geothermal water leached and absorbed ore-forming materials from its country rocks during its flowing (such metallogenic elements as silver, lead-zinc and sulphur mainly came from consolidated volcanic rocks), leading to the formation of meso - epithermal silver deposits. 展开更多
关键词 isotope geochemistry silver (lead-zinc) ore belt genesis of ore deposit Zhejiang Province
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Application of Audio-Magnetotelluric Method for Exploration the Concealed Ore-Bodies in Yuele Lead-Zinc Ore Feild, Daguan County, NE Yunnan Province, China
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作者 Tran Trong Lap Chuandong Xue +7 位作者 Aiying Wei Lv Liu Wenyao Li Qiquan Hu Jingjie Li Dafeng Luo Shaoyong Zhu Tiangui Zhang 《Journal of Geoscience and Environment Protection》 2014年第3期35-45,共11页
The results of recent mineral exploration in the Yuele lead-zinc mining area of Daguan County, northeastern Yunnan province, showed that there are much early Paleozoic strata under thick late Paleozoic strata in north... The results of recent mineral exploration in the Yuele lead-zinc mining area of Daguan County, northeastern Yunnan province, showed that there are much early Paleozoic strata under thick late Paleozoic strata in northeastern Yunnan province, where developed some hidden salt structures (SSs), often with lead-zinc polymetallic mineralization varying degrees along the tension torsional fault (belts) or fracture (joint). The ore-bodies belong to the epigenetic hydrothermal filling vein-type deposit, and the prospecting potential is great. In this area, the superficial mineralization information displayed clear, but the deep mineralization is unknown, so the exploration work is restricted. The audio-megnetotelluric (AMT) surveying is an advantageous method to characterize the size, resistivity and skin depth of the polarizable mineral deposit concealed beneath thick overburden. This paper presents the surveying results using AMT method to evaluate the concealed lead-zinc mineralization in Yuele lead-zinc ore field, Daguancounty, NE Yunnan province, China. After comparing the interpretation result of AMT surveying data with the geological data and the drilling data, it is found that there is some distinct difference in resistivity and polarizable between ore-bodies hosted strata, upper strata and gypsum strata. The results show that AMT method is helpful to identify lead-zinc mineralization under this geological condition. 展开更多
关键词 Audio-magnetotelluric method (AMT) Physical anomaly Concealed ore-bodies predicting Salt tectonics (SSs) Yuele lead-zinc ore field NE Yunnan province
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FEATURES OF ORE-CONTROLLING TECTONICS OF TAOLING LEAD-ZINC DEPOSITS, CHINA
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《Geotectonica et Metallogenia》 1994年第Z2期78-79,共2页
关键词 ore LEAD CHINA FEATURES OF ore-CONTROLLING TECTONICS OF TAOLING lead-zinc DEPOSITS
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A Preliminary Study on Fluid Inclusions and Mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit 被引量:4
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作者 WANG Lijuan ZHU Xinyou +3 位作者 WANG Jingbin DENG Jiniu WANG Yuwang ZHU Heping 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2008年第4期838-844,共7页
The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming f... The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockwork rocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluid activities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonates near the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximal facies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloor fluid activity. Fluids in altered stockwork rocks and carbonates have similar H20-NaCI-CO2 system, both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to the unstratified ore bodies. Boiling of the fluids causes the separation of CO2 vapor and liquid H2O. When the fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2, decreasing temperature and pressure as well as some involvement of seawater into the fluids result in the unmixing of fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in the unconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The oreforming temperature of unstratified ore bodies is up to high temperature indicating that there is a huge ore-forming potential in its deep. 展开更多
关键词 sedimentary-exhalative system pipe facies unstratified ore bodies fluid inclusions the Xitieshan lead-zinc deposit
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The Processing Mineralogy for Lead and Zinc Oxide Ore in Sichuan 被引量:1
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作者 YANG Mei XIAO Wending +2 位作者 YANG Xiang LIANG Dongyun WU Yan 《矿物学报》 CAS CSCD 北大核心 2013年第S1期125-125,共1页
Using variety of modern testing methods, the processing mineralogical characteristics for a lead and zinc oxide ore in Sichuan were studied systematically. The chemical analysis result shows that the lead and zinc oxi... Using variety of modern testing methods, the processing mineralogical characteristics for a lead and zinc oxide ore in Sichuan were studied systematically. The chemical analysis result shows that the lead and zinc oxide content exceeding the minimum industrial grade and iron ore, total iron content reaches a minimum industrial grade and associated with gold and silver; The mineralogical analysis result shows that lead and zinc mineral composition and configuration are very complexity. The zinc minerals and zinciferous minerals are sphalerite, hemimorphite, Smithsonite, Hydrozincite, zinc chlorite, limonite, zinc dolomite and zincocalcite; lead minerals and plumbiferous minerals are mainly galena, cerussite, anglesite, limonite and Coronadite; The minerals disseminated grain size are very fine and mineral dissemination characteristics are very complex ; expected theoretical recoveries for lead and zinc were 72% and 67% respectively. The results of this study provide basic data and theoretical basis for ore dressing. 展开更多
关键词 lead-zinc oxide ore PROCESSING MINERALOGY material composition DISSEMINATED characteristics OCCURRENCE states
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Dynamics of Ore-Forming Processesof the Stratabound Skarn Copper Depositsof Tongling, Anhui Province 被引量:2
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作者 Yu Chongwen, Jiang Yaosong and Xiao Zhengyu China University of Geosciences, Beijing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1996年第1期59-73,共15页
The skarn and ore bodies of the stratabound skarn copper deposits of Tongling, Anhui Province, are both controlled by definite stratigraphic horizons, and they are concordant with the strata. They occur as layers and ... The skarn and ore bodies of the stratabound skarn copper deposits of Tongling, Anhui Province, are both controlled by definite stratigraphic horizons, and they are concordant with the strata. They occur as layers and layer-like bodies in permeable carbonate rocks of the Middle-Upper Carboniferous Huanglong and Chuanshan Formations which are underlain by impermeable shale or siliceous rocks of the Upper Devonian Wutong Formation. The authors study the dynamics of ore-forming processes of the ore deposits with the dynamic model of coupled transport and reaction, and the following results are obtained: The salinity gradient and flow rate of the ore-forming fluids can both promote the mixing and reaction of juvenile water and formation water, and the permeable strata are favourable sites for the intense transport-reaction of mixing and the formation of deposits. (2) As isothermal transport-reaction took place along the bedding of strata, the moving transport-reaction front formed at the contact between the ore-forming fluids and the rocks advanced slowly along the permeable strata, and then stratiform skarn and ore bodies concordant with the strata were formed. (3) The gradient transport-reaction taking place across the isotherms in the cross-bedding direction caused the mineralogical composition to alter gradually from magnesian skarn to sulphide ore bodies. 展开更多
关键词 stratabound skarn ore deposit dynamics of ore-forming processes dynamics of coupled transport and reaction transport-reaction of mixing isothermal transport-reaction gradient transport-reaction
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Bacterial leaching of discarded copper ores from Yongping, China 被引量:1
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作者 Muqing Qiu Genxuan Wang Zhuxia Shen 《Journal of University of Science and Technology Beijing》 CSCD 2005年第4期294-297,共4页
The elementary and phase analysis of discarded copper ores from Yongping of China has been performed. The experi- ments of extracting copper from the discarded copper ores were done with the mixed bacteria obtained th... The elementary and phase analysis of discarded copper ores from Yongping of China has been performed. The experi- ments of extracting copper from the discarded copper ores were done with the mixed bacteria obtained through a series of enrichment, separation, domestication and combination tests. The results show that in the process of bioleaching, the pH value rises at first and drops gradually. The Eh value keeps rising along with the time and the appropriate Eh value varying between 750 and 800 mV will benefit the bioleaching copper. The high concentration of ferric ions is detrimental to the bioleaching copper. The results of bioleaching copper are good. That is, the copper recovery is 31.8% after 27 days. 展开更多
关键词 BIOLEACHING discarded copper ores mixed bacteria
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Rules of Assimilation of Single Ore and Mixed Ores 被引量:1
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作者 SU Bu-xin ZHANG Jian-liang +3 位作者 WANG Da SHAO Jiu-gang REN Shan WANG Guang-wei 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第9期8-15,共8页
Assimilation behaviors of 7 kinds of iron ores from Australia, Brazil, India, South Africa and China were evalua-ted and analyzed. On the basis of that, four ore blending principles were proposed, and seven groups of ... Assimilation behaviors of 7 kinds of iron ores from Australia, Brazil, India, South Africa and China were evalua-ted and analyzed. On the basis of that, four ore blending principles were proposed, and seven groups of iron ore pow-der blending schemes were designed. The ores of different types or from different places are shown apparently differ-ent in assimilation. The assimilation of hematite in Australia, Brazil and India is relatively high, but the assimilation o{ magnetite in South Africa and China and specularite in China is relatively low. The assimilation of the ores has negative correlation with MgO content and binary basicity, while the assimilation of the ores has positive correlation with porosity, SiO2 and Al2O3 contents, and crystal water. The iron ores with smaller crystal size and microstruc- ture looseness have relatively higher assimilation. Assimilation of mixed ores has relationship of linear, arch and "S" types to the ratio of single iron ore powder. When the charge ratio of ore is less than 25%, it possesses additivity, providing theoretical basis for optimization of ore matching. 展开更多
关键词 single ore mixed ore SINTERING ASSIMILATION
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Mixed State and High Effective Utilization of Pilbara Blending Iron Ore Powder 被引量:7
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作者 CAO Yong-guo WU Sheng-li HAN Hong-liang WANG Hong-wei XUE Fang LIU Xiao-qin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第9期1-5,共5页
Pilbara blending iron ore powder (PB powder) is blending ores with good and poor quality iron ores, so how to use PB power effectively is a problem. The self-characteristics of PB powder and its single-components we... Pilbara blending iron ore powder (PB powder) is blending ores with good and poor quality iron ores, so how to use PB power effectively is a problem. The self-characteristics of PB powder and its single-components were studied respectively such as the macroscopic properties, microscopic properties, and high-temperature properties the behavior and effect in the sintering were mastered. Then based on the new ore-proportioning idea of iron ores sintering characteristics complementary, the principles on the effective use of PB powder were discussed, and was fur ther validated through the sintering pot test and industrial production. The results show that PB powder is composed of three kinds of iron ore, and the sintering characteristics of different iron ores are obviously discrepant. With the ore-proportioning optimization based on the iron ores sintering characteristics complementary, the proportion of PB iron ore powder can be increased to more than 45 %. 展开更多
关键词 Pilbara blending ore sintering mixed state high effective utilization
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Preparation of crystalline mixed rare earth carbonates by Mg(HCO3)2 precipitation method 被引量:13
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作者 Zonghe Yu Meng Wang +4 位作者 Liangshi Wang Longsheng Zhao Zongyu Feng Xu Sun Xiaowei Huang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第3期292-298,共7页
In acid treatment technology of Baotou mixed rare earth ore,large quantities of ammonia-nitrogen wastewater are produced in the step of ammonium bicarbonate precipitation to transform rare earth sulfate.In this paper,... In acid treatment technology of Baotou mixed rare earth ore,large quantities of ammonia-nitrogen wastewater are produced in the step of ammonium bicarbonate precipitation to transform rare earth sulfate.In this paper,we adopted a green precipitant magnesium bicarbonate(Mg(HCO3)2) to substitute ammonium bicarbonate to eliminate ammonia-nitrogen pollution.The effects of n(HCO3^-):n(RE^3+),aging temperature and aging time on the crystallization using Mg(HCO3)2 precipitation method were investigated.The results indicate that the rare earths could be completely recovered when n(HCO3^-):n(RE^3+) is higher than 3.15:1.The crystal water content of rare earth carbonates is affected by the aging temperature.The precipitate has a bad filterability when the aging temperature is over 40℃.This can be attributed to the less crystallized water molecules of the hydrated rare earth carbonate precipitation.The mixed rare earth carbonates are prone to be crystalline,and have a good filterability at aging temperatures below 40℃.Meanwhile,the evolution mechanism of crystalline mixed rare earth carbonates is reasonably deduced,the amorphous rare earth carbonates are first dissolute and then recrystallized.Under the optimized aging conditions,the purity of the crystalline precipitate meets the requirements of the fine product standard(GB/T 16479-2008).The filtrated could be used to produce Mg(HCO3)2,thus to realize the recycling of magnesium sulfate. 展开更多
关键词 Baotou mixed RARE EARTH ore Magnesium BICARBONATE RARE EARTH CARBONATES Ammonia-free Crystallization mechanism FILTRATE recycling
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Fluid mixing as the mechanism of formation of the Dajing Cu-Sn-Ag-Pb-Zn ore deposit,Inner Mongolia ——Fluid inclusion and stable isotope evidence 被引量:8
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作者 刘伟 李新俊 谭骏 《Science China Earth Sciences》 SCIE EI CAS 2003年第7期652-663,共12页
Dajing Cu-Sn-Ag-Pb-Zn ore deposit, in the Inner Mongolia Autonomous Region of China, is a fissure-filling hydrothermal ore deposit. The d D values of quartz-hosted inclusion water are centered at -100 — -130. The d 3... Dajing Cu-Sn-Ag-Pb-Zn ore deposit, in the Inner Mongolia Autonomous Region of China, is a fissure-filling hydrothermal ore deposit. The d D values of quartz-hosted inclusion water are centered at -100 — -130. The d 34S values of sulfide ore minerals and d 13C values of carbonate gangue minerals vary from 0.3 to 2.6 and from -2.9 to -7.0, respectively. Integrated isotopic data point to two major contributions to the mineralizing fluid that include a dominant meteoric-derived groundwater, and sulfur and carbon species from hypogene magma. Linear trends are exhibited on the gaseous H2O versus CO2 plot, and plots of CO, N2, CH4, and C2H6. It is shown by quantitative simulation that magma degassing cannot explain the linear trends. Hence, these linear trends are interpreted in terms of mixing of CO2-rich magmatic fluid with meteoric-derived groundwater. The groundwater circulated in Paleozoic sedimentary rocks and absorbed CO, N2, CH4, C2H6 and radiogenic Ar from organic matter. Cooling effects resulting from mixing have caused the precipitation of ore minerals. 展开更多
关键词 FLUID mixing FLUID inclusion quadrupole mass spectrometer stable isotope DAJING ore deposit.
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A STUDY ON SILICON AND OXYGEN ISOTOPE GEOCHEMISTRY OF SOME LEAD-ZINC ORE DEPOSITS IN CHINA 被引量:2
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作者 蒋少涌 丁悌平 万德芳 《Chinese Science Bulletin》 SCIE EI CAS 1992年第12期1022-1027,共6页
Silicon is one of the most abundant elements in rocks and minerals, so there is a possibility of using silicon isotope to study a series of geological problems on mineral deposits, such as the origin of silicon and ge... Silicon is one of the most abundant elements in rocks and minerals, so there is a possibility of using silicon isotope to study a series of geological problems on mineral deposits, such as the origin of silicon and genesis of deposits. However, no research work has been reported in this field so far. Since the 1950s, silicon isotope variations in nature have been studied, 展开更多
关键词 SILICON ISOTOPES origin of SILICON lead-zinc ore DEPOSITS
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Spatial and Temporal Distribution of Au and Pb-Zn Mineralization:Phenomenon,Mechanism and Implication 被引量:2
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作者 WANG Dongbo SHAO Shicai +1 位作者 XU Yong LIU Guoping 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2000年第3期504-510,共7页
In the 1990s, some median-large gold deposits have been discovered in several lead-zinc metallogenetic belts (e.g. the Qinling lead-zinc metallogenetic belt, Shanxi Province and Gansu Province and the Qingchengzi lead... In the 1990s, some median-large gold deposits have been discovered in several lead-zinc metallogenetic belts (e.g. the Qinling lead-zinc metallogenetic belt, Shanxi Province and Gansu Province and the Qingchengzi lead-zinc ore field, Liaoning Province) in China. Gold deposits and lead-zinc deposits spatially co-exist in the same tectonic setting; lead-zinc orebodies are commonly located below gold ore bodies. The host rocks of lead-zinc ore-bodies are conformably overlain by those of gold ore bodies. The age of gold mineralization is obviously younger than that of lead-zinc mineralization. Preliminary geochemical research has demonstrated the following: lead-zinc mineralization took place in a marine sedimentary-exhalative system, which had the characteristics of a high fluid/rock ratio, a high salinity and a high halide activity; meanwhile, most of gold was transported into the low-temperature hydrothermal plume and primarily enriched in sediments. During later (magmatism-) metamorphism- tectonism, gold was remobilized and transported into the metamorphic fluid which had the characteristics of medium- high temperatures, a low fluid/rock ratio and a low activity of halide, and precipitated at a favourable structural site. Therefore, the co-existence of gold and lead-zinc deposits and the separation of gold from lead-zinc result from the differences of chemical composition and circulation of ore fluids in the same tectonic unit. This phenomenon can be used as an important criterion in exploration. 展开更多
关键词 gold deposit lead-zinc deposit spatial-temporal distribution ore fluid
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Mechanism of improved magnetizing roasting of siderite–hematite iron ore using a synergistic CO–H2 mixture 被引量:1
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作者 Qiang Zhao Ji-lai Xue Wen Chen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第1期12-21,共10页
A fluidized-bed magnetizing roasting-magnetic separation process was selected to treat this type of material.Phase transformations and microstructural changes in the product resulting from magnetizing roasting under d... A fluidized-bed magnetizing roasting-magnetic separation process was selected to treat this type of material.Phase transformations and microstructural changes in the product resulting from magnetizing roasting under different reducing gases(CO,H2,CO+H2)were clarified by vibrating sample magnetometry,X-ray diffraction,scanning electron microscopy,and energy-dispersive X-ray spectroscopy.The results indicated that the conversion ratio and saturation magnetization of samples roasted in a mixed gas of CO and H2 were higher than those of samples produced under CO or H2 alone.This indicated that synergy of the combined CO and H2 gas had a positive effect on the fluidized-bed magnetizing roasting process.The mechanism and kinetics of the improved magnetizing roasting of a siderite-hematite iron ore mixture under this synergistic CO-H2 system were investigated under isothermal conditions.The results indicated that the apparent activation energies of the reactions of the iron oxides decreased from 37.7 and 17.9 to 15.9 kJ/moI when the roasting atmosphere was changed from pure H2 or CO to a gas mixture of CO and H2,respectively.The mixed CO-H2 gas promoted the conversion ratio of hematite and siderite to magnetite,thereby improving the conversion ratio in the fluidized-bed magnetizing roasting process. 展开更多
关键词 SIDERITE HEMATITE mixed iron ore FLUIDIZED-BED MAGNETIZING ROASTING Kinetics MAGNETITE
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