期刊文献+
共找到911篇文章
< 1 2 46 >
每页显示 20 50 100
Atmospheric oxygen-rich direct leaching behavior of zinc sulphide concentrate 被引量:9
1
作者 徐志峰 江庆政 王成彦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3780-3787,共8页
The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve ob... The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve obviously except pyrite. Based on the relationship between elemental sulfur and the residual sulphides in the leaching residue, the dissolution of sphalerite, chalcopyrite, covellite and galena is assumed to follow the indirect oxidation reactions, where the acidic dissolution takes place firstly and then the released H2S transfers from the mineral surface into bulk solution and is further oxidized into elemental sulfur. The interface chemical reaction is further supposed as the controlling step in the leaching of these sulphides. The direct electrochemical oxidation reactions are assumed to contribute to the dissolution of pyrrhotite, which is controlled by the diffusion through elemental sulfur layer. 展开更多
关键词 zinc sulphide concentrate atmospheric direct leaching oxygen-rich leaching leaching behavior MINERALOGY
下载PDF
Pressure acid leaching of zinc sulfide concentrate 被引量:5
2
作者 古岩 张廷安 +4 位作者 刘燕 牟望重 张伟光 豆志河 蒋孝丽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期136-140,共5页
Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indica... Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indicate that the additive can improve the reaction kinetics and the conversion rate.And sulfur can be successfully separated from the zinc sulfide concentrate as elemental sulfur.The reasonable experiment parameters are obtained as follows:the leaching temperature 150℃,oxygen partial pressure 1 MPa,additive amount 1%,solid-to-liquid ratio 1:4,leaching time 2 h,initial sulfuric acid concentration 15%,and particle size less than 44μm.Under the optimum conditions,the leaching rate of the zinc can reach 95%and the reduction rate of the sulfur can reach 90%. 展开更多
关键词 zinc sulfide concentrate pressure acid leaching zinc SULFUR
下载PDF
Recovery of gallium from zinc concentrate by pressure oxygen leaching 被引量:4
3
作者 Xue-Lan Wu Wen-Qing Qin +3 位作者 Shun-Ke Wu Xi-Hong Ma Yin-Jian Niu Cong-Ren Yang 《Rare Metals》 SCIE EI CAS CSCD 2013年第6期622-626,共5页
Zinc concentrate with high gallium content is one of the main resources of gallium.The gallium presents in the form of isomorphism in tetrahedron coordination with sulfur in sphalerite.The research was to investigate ... Zinc concentrate with high gallium content is one of the main resources of gallium.The gallium presents in the form of isomorphism in tetrahedron coordination with sulfur in sphalerite.The research was to investigate the amenability of zinc concentrate with high gallium to pressure oxygen leaching.The particle size,sulfuric acid concentration,oxygen partial pressure,additive amount,and time of reaction were studied.The extraction yields of gallium and zinc are 86%and 98%,respectively.The optimal condition is 100 g of zinc concentrate with particle size smaller than 38 lm,sulfuric acid concentration150 g L-1,leaching temperature 150℃,leaching time120 min,oxygen partial pressure 0.7 MPa,additive amount of 0.2 wt%. 展开更多
关键词 GALLIUM Pressure oxygen leaching zinc concentrate
下载PDF
Metallogeny of the Baiyangping Lead-Zinc Polymetallic Ore Concentration Area, Northern Lanping Basin of Yunnan Province, China 被引量:5
4
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
下载PDF
ELECTROCHEMICAL NOISE ANALYSIS OF THE INFLUENCE OF THE Zn^(2+)IONS CONCENTRATION ON ZINC ELECTROPLATING
5
作者 Z.Zhang C.S.Wu +2 位作者 Q.Y.Cai F.H.Cao J.Q.Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第2期137-144,共8页
The influence of the concentration of Zn2+ ions on zinc electroplating process was investigated by means of electrochemical noise (EN) and cyclic voltammetry methods in conjunction with the scanning electron microscop... The influence of the concentration of Zn2+ ions on zinc electroplating process was investigated by means of electrochemical noise (EN) and cyclic voltammetry methods in conjunction with the scanning electron microscopy (SEM) technique. It was found that the EN generated during the electroplating of dentritic or large polymeric zinc deposit has large potential oscillation amplitude and positive potential drift while the compact zinc deposit possesses small noise amplitude and little potential drift. With the change of rate determining step from diffusion-control through mixed-control to activation-control, the maximum relative energy obtained from wavelet analysis defined from the region with larger scales to those with smaller scales, and the EDP (relative energy distribution plot) can be us, as 'fingerprints' of EN to characterize the electroplating process and the deposit structure. The results also showed that electrochemical noise technique can give more information about the electrodeposit structure than other normal electrochemical measurements, such as linear potential sweep method and cyclic voltammetry technique. 展开更多
关键词 zinc electroplating zinc ions concentration electrochemical noise electrodeposit structure
下载PDF
Reductive leaching of zinc and indium from industrial zinc ferrite particulates in sulphuric acid media 被引量:7
6
作者 张帆 魏昶 +3 位作者 邓志敢 李存兄 李兴彬 李旻廷 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2495-2501,共7页
Zinc ferrite is the principal constituent in zinc neutral-leach residue(NLR) which is commonly treated by hot-acid leaching in electrolytic zinc plants. Reductive leaching of zinc ferrite with sphalerite concentrate... Zinc ferrite is the principal constituent in zinc neutral-leach residue(NLR) which is commonly treated by hot-acid leaching in electrolytic zinc plants. Reductive leaching of zinc ferrite with sphalerite concentrate as a reducing agent was performed. It was found that leaching of zinc ferrite in the presence of sphalerit concentrate was a viable process that effectively extracted zinc and indium and converted Fe^3+ into Fe^2+ at the same time. Reflux leaching tests by two stages were performed to achieve extractions of 98.1% for zinc and 97.5% for indium, and a Fe^2+/Fe^3+ molar ratio of 9.6 in leach solution was also obtained. The leaching behaviors of other elements, such as iron, copper and tin were also studied. The results showed that iron and copper were completely leached, whereas tin presented lower extraction values. 展开更多
关键词 reductive leaching zinc ferrite zinc INDIUM sphalerite concentrate
下载PDF
Relative bioavailability of tribasic zinc sulfate for broilers fed a conventional corn-soybean meal diet 被引量:2
7
作者 LI Wen-xiang MA Xin-yan +2 位作者 LU Lin ZHANG Li-yang LUO Xu-gang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2015年第10期2042-2049,共8页
An experiment was carried out to investigate the relative bioavailability of tribasic zinc(Zn) sulfate relative to Zn sulfate for broilers fed a conventional corn-soybean meal diet. A total of 504 1-d-old Arbor Acre... An experiment was carried out to investigate the relative bioavailability of tribasic zinc(Zn) sulfate relative to Zn sulfate for broilers fed a conventional corn-soybean meal diet. A total of 504 1-d-old Arbor Acres commercial male chicks were randomly assigned by body weight of birds to one of seven treatments involving a 2×3 factorial arrangement with three levels of added Zn(30, 60, or 90 mg of Zn kg–1) and two Zn sources(tribasic Zn sulfate and Zn sulfate) plus a control with no added Zn for an experimental phase of 14 d. Plasma Zn, tibia ash Zn, pancreas Zn, and pancreas metallothionein(MT) messenger RNA(m RNA) were analyzed at 6 or 14 d of age post-hatching. The results showed that plasma Zn, tibia ash Zn, pancreas Zn, and pancreas MT m RNA increased linearly(P〈0.002) as dietary Zn concentration increased at 6 or 14 d of age. The R2 for a linear model was greater on d 6 than on d 14 for the above 4 responsive criteria, and among these indices, the fitting of the tibia ash Zn concentration was the best(R2=0.99). Therefore, based on slope ratios from the multiple linear regressions of the above 4 indices of the birds at 6 d of age on daily intake of dietary Zn, the bioavailabilities of tribasic Zn sulfate relative to Zn sulfate(100%) were 95.6%(P=0.18), 83.5%(P=0.01), 87.9%(P=0.53), and 75.9%(P=0.38) for the tibia ash Zn, pancreas Zn, plasma Zn, and pancreas MT m RNA, respectively. The results indicated that generally, Zn from tribasic Zn sulfate was as available as Zn from Zn sulfate for broilers. 展开更多
关键词 tribasic zinc sulfate BIOAVAILABILITY Zn concentration MT gene expression BROILERS
下载PDF
Extracting indium and preparing ferric oxide for soft magnetic ferrite materials from zinc calcine reduction lixivium 被引量:3
8
作者 何静 唐谟堂 +4 位作者 周存 吴胜男 陈永明 王涛 黄玲 《Journal of Central South University》 SCIE EI CAS 2011年第4期1074-1079,共6页
A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed. Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine... A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed. Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine as raw solution, copper and indium were firstly recovered by iron powder cementation and neutralization. The recovery ratios of Cu and In are 99% and 95%, respectively. Some harmful impurities that have negative influences on magnetic properties of soft magnetic ferrite material are deeply removed with sulfidization purification and neutral flocculation method. Under the optimum conditions, the content of impurities like Cu, Pb, As, Al in pure Zn-Fe sulfate solution are less than 0.004 g/L, but those of Cd, Si, Ca and Mg are relatively high. Finally, thermal precipitation of iron is carried out at 210 ℃ for 1.5 h. The precipitation ratio of Fe is 93.33%. Compared with the quality standard of ferric oxide for soft magnetic ferrite materials, the contents of Al and Mg in obtained ferric oxide powder meet the requirement of YHT1 level of ferric oxide, and those of Si, Ca meet the requirement of YHT3 level of ferric oxide. XRD and SEM characterizations confirm that the obtained sample is well-dispersed spindle spherule with regular a-Fe2O3 crystal structure. The length-to-diameter ratio ofa-Fe2O3 powder is (3-4):1 with an average particle size of 0.5 μm. 展开更多
关键词 zinc concentrates zinc hydrometallurgy indium extraction deep purification ferric oxide powder
下载PDF
Effect of Different Kinds of Zinc (Ⅱ) on Early Hydration of Calcium Aluminate Cement 被引量:2
9
作者 WANG Jingran ZHANG Jinhua +1 位作者 TAN Hongbo MA Baoguo 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第5期925-929,共5页
The early hydration of calcium aluminate cement (CAC) with different kinds of zinc (II),such as ZnSO4g7H2O,ZnO,Zn(NO3)2·6H2O and ZnCl2,was analyzed.Changes in consistency,setting time,hydration heat flow,hydratio... The early hydration of calcium aluminate cement (CAC) with different kinds of zinc (II),such as ZnSO4g7H2O,ZnO,Zn(NO3)2·6H2O and ZnCl2,was analyzed.Changes in consistency,setting time,hydration heat flow,hydration heat amount,ion concentration in solution,and hydration products were found upon the addition of different Zn^2+.The water consumption of standard consistency of CAC is decreased with different Zn^2+.Zn^2+ can delay the initial hydration of CAC.The induction period of cement with Zn^2+ is longer than that of CAC,especially the reaction time of the acceleration period is extended.Zn^2+ can promote hydration hydrate of CAC at 24 h.The characteristic diffraction peaks of CA and CA2 in CAC with different Zn^2+ are significantly reduced.It can inhibit the formation of CAH10 and promote the formation C3AH6 and AH3 in hydration products at 24 h. 展开更多
关键词 zinc calcium aluminate cement ion concentration HYDRATION
下载PDF
Effect of Socio-Demographic Factors on Zinc Status of Infants and Preschool Children in East Gojjam, Amhara Region of Ethiopia
10
作者 Adamu Belay Grace Marquis Gulelat Desse 《Journal of Food Science and Engineering》 2015年第1期22-36,共15页
Zinc deficiency is a public health concern and is the most prevalent micronutrient deficiencies in developing countries. The main objective of this study was to assess the prevalence and risk factors of zinc deficienc... Zinc deficiency is a public health concern and is the most prevalent micronutrient deficiencies in developing countries. The main objective of this study was to assess the prevalence and risk factors of zinc deficiency among infants and preschool children. Based on a community, the cross-sectional study was conducted in East Gojjam between October 2011 and April 2012. Two hundred and forty infants and preschool children were randomly selected in the study. Data on potential determinants of zinc deficiency were collected using a structured questionnaire. Serum zinc concentration was measured using atomic absorption spectrometer. Statistical analysis was done using ANOVA, independent sample student's t-test and linear regression model. The mean serum zinc concentration of infants and preschool children was 62.98 (±13.03) μg/dL in 95% confidence interval (CI) between 61.32 and 64.63 (i.e., 95% CI: 61.32, 64.63). About 57,1% of the subjects were zinc deficient. The main determinants of low serum zinc status of infants and preschool children were age and number of family members living on the same land. Zinc status of older children was 3.67 μg/dL (95% CI: -5.58, -1.77) lower than children who were aged 6-10 months. Serum zinc status of infants and preschool children is decreased by 0.83 p.g/dL (95% CI: -1.36, -0.30) with each additional family member. Food insecurity, dietary diversity, sex, child health, anthropometric indices, maternal education and wealth index were not associated with serum zinc status. Zinc deficiency among infants and preschool children is highly prevalent. Such potential deficiencies require urgent attention, including complementary food preparation education, traditional phytate reduction method and family planning implementation recommended in the study area. 展开更多
关键词 Serum zinc concentration zinc deficiency infant and preschool children.
下载PDF
硫化锌精矿氧压浸出过程中硫回收率的影响机制
11
作者 陈龙义 《有色金属(冶炼部分)》 CAS 北大核心 2024年第10期106-110,共5页
锌氧压浸出特点是硫化锌精矿直接湿法浸出,硫不进入烟气,而是直接转化成单质硫回收。该工艺生产流程更简单,环境友好,综合能耗低,硫磺产品相对更容易储存、运输及销售。因此该技术的推广应用对锌冶炼行业节能减排乃至碳达峰碳中和目标... 锌氧压浸出特点是硫化锌精矿直接湿法浸出,硫不进入烟气,而是直接转化成单质硫回收。该工艺生产流程更简单,环境友好,综合能耗低,硫磺产品相对更容易储存、运输及销售。因此该技术的推广应用对锌冶炼行业节能减排乃至碳达峰碳中和目标的实现意义重大。从精矿矿物特征及金属的浸出率、浸出过程中硫元素的酸化率、硫磺结晶过程控制、硫浮选效率以及硫精矿热过滤温度等方面着手,研究其对硫磺回收率的影响机制。 展开更多
关键词 硫化锌精矿 氧压浸出 回收率
下载PDF
甘肃某细粒铅锌矿工艺优化试验研究
12
作者 杨俊龙 黄雪雄 郭艳华 《现代矿业》 CAS 2024年第5期124-127,共4页
甘肃某铅锌矿中铅品位为0.74%,锌品位为3.72%,为了实现该矿产资源的高效回收利用,针对铅锌矿物嵌布关系紧密,粒度较细,造成铅锌精矿互含量较高,影响浮选指标的问题,在原矿性质研究的基础上,进行了4种不同方案的工艺流程对比试验。试验... 甘肃某铅锌矿中铅品位为0.74%,锌品位为3.72%,为了实现该矿产资源的高效回收利用,针对铅锌矿物嵌布关系紧密,粒度较细,造成铅锌精矿互含量较高,影响浮选指标的问题,在原矿性质研究的基础上,进行了4种不同方案的工艺流程对比试验。试验结果表明:采用铅锌优先浮选—铅、锌粗精矿均再磨的工艺流程,最终获得的铅精矿铅品位为58.42%,铅回收率为79.95%,锌精矿锌品位为56.27%,锌回收率为93.05%。相较于方案2,锌精矿锌品位提高了3.03个百分点,锌回收率提高了2.75个百分点;相较于方案1现场生产工艺,铅、锌主品位提高,铅、锌互含量显著降低,锌回收率提高了4.15个百分点。 展开更多
关键词 铅锌矿 微细粒 浮选 再磨 粗精矿
下载PDF
硫化钠体系中异极矿表面的硫化特性及硫化产物解析 被引量:1
13
作者 张嘎 王美丽 +2 位作者 和永新 王涵 丰奇成 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第2期629-642,共14页
通过多种分析检测方法揭示硫化钠体系中异极矿表面的硫化特性和机理,并对异极矿表面硫化产物进行分析测试。研究结果表明,硫化钠浓度对异极矿表面的硫化效果具有显著影响,即提高硫化钠浓度能促进矿浆溶液中硫组分与矿物表面反应,从而提... 通过多种分析检测方法揭示硫化钠体系中异极矿表面的硫化特性和机理,并对异极矿表面硫化产物进行分析测试。研究结果表明,硫化钠浓度对异极矿表面的硫化效果具有显著影响,即提高硫化钠浓度能促进矿浆溶液中硫组分与矿物表面反应,从而提高异极矿表面硫化产物的含量及矿物表面的疏水性。XPS和ToF-SIMS分析表明,异极矿表面的硫化产物并非单一的硫化物,而是由硫化物(S^(2−))和多硫化物(S_(n)^(2−))组成,且矿物表面多硫化物含量随硫化钠浓度的增加而增加,从而增强异极矿表面硫化产物的活性。 展开更多
关键词 硫化特性 异极矿 硫化钠浓度 硫化锌组分 多硫化物
下载PDF
不同锌源叶面喷施对冬小麦和夏玉米产量及籽粒营养品质的影响
14
作者 颜为 孙金鞭 +6 位作者 吕洪国 黄萌 王志伟 齐世军 崔振岭 薛艳芳 刘开昌 《农业环境科学学报》 CAS CSCD 北大核心 2024年第3期504-515,共12页
为探明不同锌源叶面肥喷施对小麦和玉米产量、籽粒矿质元素含量及锌、铁生物有效性的影响,对冬小麦-夏玉米轮作体系开展不同叶面肥喷施试验。小麦季设置去离子水(CK1)、尿素(CK2)、尿素+纳米氧化锌(U+ZnO)、尿素+壳聚糖纳米锌(U+ZnCNP)... 为探明不同锌源叶面肥喷施对小麦和玉米产量、籽粒矿质元素含量及锌、铁生物有效性的影响,对冬小麦-夏玉米轮作体系开展不同叶面肥喷施试验。小麦季设置去离子水(CK1)、尿素(CK2)、尿素+纳米氧化锌(U+ZnO)、尿素+壳聚糖纳米锌(U+ZnCNP)、尿素+普通七水硫酸锌(U+Zn)5种叶面肥处理;玉米季增加尿素与锌铁硒多元混合喷施处理(U+Zn/Fe/Se)。结果表明:各叶面肥喷施处理对小麦和玉米籽粒产量均无显著影响,但对籽粒微量元素含量有显著影响。不同锌源与尿素混合叶面肥对小麦籽粒锌含量强化效果由弱到强依次为U+ZnCNP<U+ZnO<U+Zn。与CK2处理相比,处理U+Zn使小麦籽粒锌含量显著提高77.7%(从22.80 mg·kg^(-1)增加至40.52 mg·kg^(-1))、籽粒植酸与锌(PA/Zn)摩尔比显著下降42.1%,使籽粒锌生物有效性(TAZ)显著提高74.5%。对于玉米,与CK2处理相比,处理U+Zn/Fe/Se使籽粒锌含量提高32.3%(从14.93 mg·kg^(-1)增加至19.60 mg·kg^(-1))、硒含量显著提高12.7倍(从17.66μg·kg^(-1)增加至242.04μg·kg^(-1))、籽粒PA/Zn摩尔比显著下降27.0%,使籽粒TAZ显著提高36.9%,使整个植株或玉米秸秆磷与锌(P/Zn)和磷与铁(P/Fe)摩尔比降低。研究表明,叶面喷施普通七水硫酸锌是提高小麦、玉米籽粒锌含量和生物有效性的最佳形式,其强化小麦籽粒锌效果优于玉米。叶面喷施尿素与锌铁硒混合溶液可同时提高玉米籽粒锌、硒含量及锌、铁生物有效性(籽粒、全株、秸秆),是解决人体或动物微量元素营养缺乏的有效农艺强化措施。 展开更多
关键词 冬小麦-夏玉米轮作 不同锌源 锌铁生物有效性 叶面喷施 微量元素含量
下载PDF
锌氧压酸浸硫精矿和硫尾矿的矿物学特征与环境活性
15
作者 孙朴 李兴彬 +4 位作者 魏昶 邓志敢 李旻廷 罗兴国 樊刚 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第1期32-42,共11页
采用电感耦合(ICP-OES)、X射线衍射(XRD)、扫面电镜-能谱(SEM-EDS)、红外光谱(FTIR)及差热差重(TG-DTA)等多种检测方法对锌氧压酸浸硫精矿和硫尾矿的化学组成、粒度分布、物相结构等进行研究,并采用毒性浸出程序(TCLP)法考察其短期环境... 采用电感耦合(ICP-OES)、X射线衍射(XRD)、扫面电镜-能谱(SEM-EDS)、红外光谱(FTIR)及差热差重(TG-DTA)等多种检测方法对锌氧压酸浸硫精矿和硫尾矿的化学组成、粒度分布、物相结构等进行研究,并采用毒性浸出程序(TCLP)法考察其短期环境活性。研究结果表明:硫精矿1和硫精矿2主要以球状的单质硫存在,其中,少量硫精矿1以小颗粒的闪锌矿、黄铁矿等附着于块状的铁矾颗粒上,平均粒径为22.1μm;少量硫精矿2以块状的闪锌矿、黄铁矿和小颗粒存在,平均粒径为59.2μm。2种硫精矿在185~340℃时会剧烈燃烧,热稳定性较差。2种硫尾矿主要以块状的铅黄铁矾和黄钠铁矾存在,其中,硫尾矿1平均粒径为21.1μm;硫尾矿2含一定的赤铁矿(16.86%),平均粒径为5.3μm。硫精矿和硫尾矿中锌和镉元素在弱酸条件下不稳定,硫尾矿1中锌和镉的浸出量分别超标1.93倍和2.50倍;硫精矿2的分别超标2.03倍和6.56倍,硫尾矿1的分别超标3.46倍和5.94倍,硫尾矿2的分别超标11.10倍和8.28倍。 展开更多
关键词 锌氧压酸浸 硫精矿 硫尾矿 微观结构 工艺矿物学 浸出毒性
下载PDF
水系锌离子电池宽温域性能的电解质改性策略研究进展
16
作者 程羽 何灵均 +7 位作者 林楚园 林慧 肖富玉 赖文斌 钱庆荣 黄晓霞 陈庆华 曾令兴 《应用化学》 CAS CSCD 北大核心 2024年第3期349-364,共16页
在资源短缺、能源需求倍增的当今世界,水系锌离子电池(AZIBs)作为一种大规模储能技术以其具有高安全性、低成本、高容量和快速充放电等优势脱颖而出。随着对能源多元化应用场景的增加,AZIBs被开发并应用于多种极端环境。然而,电池中的... 在资源短缺、能源需求倍增的当今世界,水系锌离子电池(AZIBs)作为一种大规模储能技术以其具有高安全性、低成本、高容量和快速充放电等优势脱颖而出。随着对能源多元化应用场景的增加,AZIBs被开发并应用于多种极端环境。然而,电池中的自由水分子会引发一系列的不良反应,导致电池出现容量下降和寿命缩短的问题。在低温条件下,溶剂水的冻结会引起AZIBs的离子电导率降低、电荷转移阻抗增加,导致电池速率性能下降。在高温条件下,溶剂水的快速蒸发会产生气泡和气体膨胀,水诱导的副反应加剧,同时电极材料也会出现腐蚀和溶解,从而影响电池寿命。针对这些挑战,在这篇综述中,分别总结了针对水系锌离子电池在高温与低温下的研究进展,提出了适用于低温、高温以及同时适用于高低温的电解质策略,重点研究了高浓度电解质、凝胶电解质、电解质添加剂和共晶电解质降低电解质凝固点、提高低温电化学性能的机理,并对进一步提高水系锌离子电池的宽温域性能和工业应用进行了展望。 展开更多
关键词 水系锌离子电池 低温 高温 高浓度电解质 凝胶电解质 添加剂
下载PDF
某铅锌浮选厂颗粒物浓度分布及其影响研究
17
作者 周天瑜 张鑫 +2 位作者 聂兴信 张晨煜 孙泽宇 《黄金》 CAS 2024年第9期87-91,共5页
铅锌浮选厂在生产过程中产生大量颗粒物,污染工作环境。以某铅锌浮选厂为研究对象,对厂房内、外颗粒物浓度分布情况进行测试分析,并对其污染状态及健康影响进行深入研究。结果表明:粒径小于10μm颗粒物其厂房内数量浓度高于厂房外,且数... 铅锌浮选厂在生产过程中产生大量颗粒物,污染工作环境。以某铅锌浮选厂为研究对象,对厂房内、外颗粒物浓度分布情况进行测试分析,并对其污染状态及健康影响进行深入研究。结果表明:粒径小于10μm颗粒物其厂房内数量浓度高于厂房外,且数量浓度随粒径变小而增加,厂房内、外颗粒物的数量浓度比平均值大多大于1。PM_(10)、PM_(2.5)和PM1的厂房内质量浓度显著高于厂房外,厂房内PM_(10)、PM_(2.5)分别超过一级标准5.333倍和6.313倍,超过二级标准2.614倍和2.134倍。厂房内对厂房外颗粒物浓度有较大影响,颗粒物的分布和浓度也有所不同,环境因素对粉尘污染有较大影响。研究结果可为矿山环境颗粒物的有效控制提供数据参考价值。 展开更多
关键词 铅锌浮选厂 颗粒物 浓度分布 质量浓度 数量浓度
下载PDF
锌精矿与锌浸出渣加压协同助浸过程优化及动力学研究
18
作者 李倡纹 李存兄 +5 位作者 戴兴征 陆占清 王启亮 陈帮耀 宋健清 成圳 《有色金属(冶炼部分)》 CAS 北大核心 2024年第10期38-48,共11页
针对现有锌精矿加压浸出过程氧气利用率低、闪锌矿溶解缓慢等问题,利用锌浸出渣中Fe^(3+)的强氧化性以及Fe^(2+)/Fe^(3+)氧化还原离子对输氧效能,提高闪锌矿中S2-的高效氧化和O2利用率,实现锌精矿与锌浸出渣协同强化浸出。研究结果表明,... 针对现有锌精矿加压浸出过程氧气利用率低、闪锌矿溶解缓慢等问题,利用锌浸出渣中Fe^(3+)的强氧化性以及Fe^(2+)/Fe^(3+)氧化还原离子对输氧效能,提高闪锌矿中S2-的高效氧化和O2利用率,实现锌精矿与锌浸出渣协同强化浸出。研究结果表明,Fe^(3+)可以提高氧气溶解度,同时Fe^(2+)/Fe^(3+)的往返变价行为加速了浸出体系中闪锌矿(ZnS)的氧化溶解,锌的浸出速率和浸出率得到显著提升。以锌浸出渣形式向体系添加6.1 g/L Fe^(3+)、在初始硫酸浓度95 g/L、氧分压0.8 MPa、反应温度160℃、反应时间120 min的优化条件下,锌浸出率可以达到98.60%,同时92.47%的铁沉淀入渣。锌精矿与锌浸出渣协同助浸受外扩散控制,表观活化能为15.61 kJ/mol,协同浸出的动力学方程为:1-(1-α)^(1/3)=4.78×10^(-3)×{[exp(-15610/8.314T)]×c(H_(2)SO_(4))1.21×P(O_(2))0.33×c(Fe^(3+))0.43×t}。 展开更多
关键词 锌精矿 加压浸出 锌浸出渣 动力学
下载PDF
锌精矿氧压浸出技术研究进展
19
作者 刘鑫宇 郭宝 左蔚然 《有色金属(冶炼部分)》 CAS 北大核心 2024年第5期19-26,共8页
传统湿法炼锌工艺存在烟气处理成本高、综合回收率低等问题,近年来,氧压浸出技术因其原料适应性强、锌回收率高、环境污染小等优点被应用于锌冶炼工业。介绍了锌精矿氧压浸出的生产工艺,论述了浸出过程反应的基本原理,以及离子催化、温... 传统湿法炼锌工艺存在烟气处理成本高、综合回收率低等问题,近年来,氧压浸出技术因其原料适应性强、锌回收率高、环境污染小等优点被应用于锌冶炼工业。介绍了锌精矿氧压浸出的生产工艺,论述了浸出过程反应的基本原理,以及离子催化、温度、酸度、分散剂等条件对浸出过程离子行为的影响与机理。讨论了锌精矿中伴生元素铁、镓、锗、铟、银等的浸出行为及在不同浸出条件下浸出行为的变化。 展开更多
关键词 湿法炼锌 锌精矿 氧压浸出 硫酸浸出
下载PDF
锌浸渣浮选银精矿还原焙烧-低酸浸出脱锌
20
作者 黄玉柱 裴双 +3 位作者 刘宇倩 周合理 朱晓红 胡宇杰 《有色金属(冶炼部分)》 CAS 北大核心 2024年第7期25-32,共8页
以某湿法炼锌厂产出的锌浸渣浮选银精矿为原料,采用回转炉还原焙烧—低酸浸出工艺进行脱锌研究。结果表明:在碳粉加入量10%、焙烧温度600℃、时间120 min、原料粒度-0.1 mm、回转炉转速5 r/min的条件下,铁酸锌还原焙烧分解效果最优,焙... 以某湿法炼锌厂产出的锌浸渣浮选银精矿为原料,采用回转炉还原焙烧—低酸浸出工艺进行脱锌研究。结果表明:在碳粉加入量10%、焙烧温度600℃、时间120 min、原料粒度-0.1 mm、回转炉转速5 r/min的条件下,铁酸锌还原焙烧分解效果最优,焙烧产物中可溶锌率达到85.83%。在硫酸终点pH为2、液固比5 mL/g、浸出温度70℃、浸出时间90 min优化条件下,对焙烧产物进行选择性浸出,锌和铁的浸出率分别为84.23%和34.71%。浸出渣中未溶解铁锌氧化物主要为还原焙烧过程中团聚成块的大颗粒及被硫酸铅熔化包裹形成的颗粒。 展开更多
关键词 锌浸渣浮选银精矿 铁酸锌 还原焙烧 低酸浸出 脱锌工艺
下载PDF
上一页 1 2 46 下一页 到第
使用帮助 返回顶部