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一种新的铂族金属矿床类型—热液再活化矿床
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作者 王家枢 《地质科技动态》 1990年第1期1-4,共4页
关键词 铂族 金属矿 类型 热液活化 矿化
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一种新的铂族金属矿床类型:热液再活化矿床
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作者 Hoat.,DM 《四川地质科技情报》 1997年第4期30-32,42,共4页
关键词 铂族金属矿床 类型 矿床 热液活化
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铂族元素矿床研究的某些新进展及其对于四川找铂的启示 被引量:4
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作者 王登红 陈振宇 +1 位作者 李建康 应立娟 《四川地质学报》 2003年第4期202-208,共7页
近年来由于市场需要 ,国内外都开始新一轮的铂族元素矿床找矿工作并取得了新进展。这些进展突出地表现为在世界各地都有新的矿床、矿点发现 ,其中特提斯—喜马拉雅成矿带有可能成为一条新的铂族元素成矿带。在成矿理论方面 ,铂族元素的... 近年来由于市场需要 ,国内外都开始新一轮的铂族元素矿床找矿工作并取得了新进展。这些进展突出地表现为在世界各地都有新的矿床、矿点发现 ,其中特提斯—喜马拉雅成矿带有可能成为一条新的铂族元素成矿带。在成矿理论方面 ,铂族元素的热液成矿机制和铂族元素在相对低温条件下通过热液作用的活化转移、重新成矿机制受到普遍关注。我国西南部地区的铂族元素矿床具有点多面广、类型多、时代多的特点 ,尤其是后期构造—热事件对于前期含矿构造层的影响非常明显 ,这一方面可能破坏了原有的含矿岩体使之支离破碎 ,但也因此可能形成富矿体。以PGE找铂的地球化学方法在使用时应考虑到具体的地质情况 ,高异常不见得有矿 ,低异常也不见得无矿。 展开更多
关键词 铂族元素矿床 找矿 新进展 热液活化
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Kinetic study on carbothermic reduction of ilmenite with activated carbon 被引量:4
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作者 Hai-peng GOU Guo-hua ZHANG +1 位作者 Xiao-jun HU Kuo-chih CHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第8期1856-1861,共6页
The carbothermic reduction of Panzhihua ilmenite with various additions of activated carbon was investigated byisothermal experiments over the temperature range of1373to1773K in the argon atmosphere.According to the r... The carbothermic reduction of Panzhihua ilmenite with various additions of activated carbon was investigated byisothermal experiments over the temperature range of1373to1773K in the argon atmosphere.According to the reaction kineticsrecorded by the infrared gas analyzer,it was found that the amount of carbon addition had little influence on the reaction rates atvarious temperatures except1473K.When the reaction temperature was above the eutectic temperature of1427K of Fe?C binarysystem,part of carbon would dissolve into Fe to form a liquid phase,which made the liquid Fe as a diffusion channel of carbon todiffuse to the reaction interface.The carbothermic reduction above1573K obeyed the shrinking-core model.The mass fraction ofTiC could be determined by the standard addition technique. 展开更多
关键词 ILMENITE carbothermic reduction activated carbon titanium carbide solid-liquid interface
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Adsorption of dimethyl trisulfide from aqueous solution on a low-cost adsorbent:thermally activated pinecone 被引量:1
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作者 商景阁 何伟 范成新 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第1期169-175,共7页
Thermally activated pinecone(TAP) was used for the adsorption of dimethyl trisulfide(DMTS)from aqueous solutions,which was proved to be the main odorous in algae-caused black bloom.The effects of adsorbent dosage,adso... Thermally activated pinecone(TAP) was used for the adsorption of dimethyl trisulfide(DMTS)from aqueous solutions,which was proved to be the main odorous in algae-caused black bloom.The effects of adsorbent dosage,adsorbate concentration and contact time on DMTS biosorption were studied.The TAP produced at 600℃ exhibited a relatively high surface area(519.69 m^2/g) and excellent adsorption capacity.The results show that the adsorption of DMTS was initially fast and that the equilibrium time was6 h.Higher initial DMTS concentrations led to lower removal percentages but higher adsorption capacity.The removal percentage of DMTS increased and the adsorption capacity of TAP decreased with an increase in adsorbent dosage.The adsorption process conforms well to a pseudo-second-order kinetics model.The adsorption of DMTS is more appropriately described by the Freundlich isotherm(R^2=0.996 1) than by the Langmuir isotherm(R^2=0.916 9).The results demonstrate that TAP could be an attractive low-cost adsorbent for removing DMTS from water. 展开更多
关键词 dimethyl trisulfide LOW-COST adsorption isotherms ADSORBENT
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Adsorption and desorption properties of D318 resin for Cr(Ⅵ) 被引量:1
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作者 舒增年 熊春华 《Journal of Central South University》 SCIE EI CAS 2009年第3期405-409,共5页
The adsorption capability of D318 resin for Cr(Ⅵ) was investigated by chemistry analysis. Experimental results show that D318 resin has the best adsorption ability for Cr(Ⅵ) at pH=3.16 in HAc-NaAc medium. The st... The adsorption capability of D318 resin for Cr(Ⅵ) was investigated by chemistry analysis. Experimental results show that D318 resin has the best adsorption ability for Cr(Ⅵ) at pH=3.16 in HAc-NaAc medium. The statically saturated adsorption capacity of the resin is 265.4 mg/g. The thermodynamic adsorption parameters, enthalpy change AH and free energy change AG298 of the adsorption reaction are 4.81 and -5.16 kJ/mol, respectively. The apparent activation energy Ea is 22.4 kJ/mol. The adsorption behavior obeys the Freundlich isotherm. The molar coordination ratio of the functional group of resin to Cr(Ⅵ) is 3:2. Cr(Ⅵ) adsorbed on D318 resin can be eluted by 5%NaOH-5%NaCl quantitatively. 展开更多
关键词 Cr(Ⅵ) D318 resin ADSORPTION DESORPTION DYNAMICS THERMODYNAMICS
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Hydrothermal activities and seawater acidification in the Late Devonian F-F transition:Evidence from geochemistry of rare earth elements 被引量:12
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作者 ZENG JianWei XU Ran GONG YiMing 《Science China Earth Sciences》 SCIE EI CAS 2011年第4期540-549,共10页
Rare-earth dements (REE) in limestones were measured by ICP-MS from the Yangdi section across the Frasnian-Famennian (F-F) transition in Guilin, Guangxi of South China. The average EREE contents of measured sample... Rare-earth dements (REE) in limestones were measured by ICP-MS from the Yangdi section across the Frasnian-Famennian (F-F) transition in Guilin, Guangxi of South China. The average EREE contents of measured samples are 33.32 ppm. The average LREE/HREE ratio is 6.35. Data show LREE-enriched REE distribution pattern in the Yangdi section. Most of samples are characterized by positive Eu anomaly with average of 1.13, and there are two maxima of Eu anomaly just below the F-F boundary. Almost all analytical samples show obvious tetrad effects. Remarkable M-shaped tetrad effects are observed in these samples with positive Eu anomaly. The characters of REE and some relative elements (Fe, Mn, Al, etc.) indicate that hydro- thermal activities occurred and resulted in seawater acidification in Upper and Lower Kellwasser horizons of the Late Devonian. The changes of marine environment caused by hydrothermal activities, such as seawater acidification, heavy metal pollution, and eutrophication, would destroy the neritic ecosystem and finally result in the F-F mass extinction. 展开更多
关键词 DEVONIAN mass extinction REE hydrothermal activities tetrad effects seawater acidification
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Geochemical evidence for submarine hydrothermal origin of the Middle-Upper Permian chert in Laibin of Guangxi, China 被引量:29
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作者 QIU Zhen WANG QingChen 《Science China Earth Sciences》 SCIE EI CAS 2011年第7期1011-1023,共13页
Lithologically, two kinds of chert can be recognized in the Middle-Upper Permian from the Tieqiao section in Laibin area, Guangxi, i.e., calcic chert occurring mainly in the Maokou Formation and pure chert mainly in t... Lithologically, two kinds of chert can be recognized in the Middle-Upper Permian from the Tieqiao section in Laibin area, Guangxi, i.e., calcic chert occurring mainly in the Maokou Formation and pure chert mainly in the Wujiaping Formation. Geochemical data show that both kinds of chert contain very low A1203 (0-0.23%) and TiO2 (0.001%-0.024%) and low ZREE (0.55-19.94 ppm, averaging 9.97 ppm), as well as high ratio of Fe2O3/TiO2 (17-443, averaging 111) and low ratio of A1203/(Al2O3+Fe203) (0-0.26, averaging 0.09). Given that the average value Ce anomalies in chert deposited in the ridge-proximal environment is about 0.29, and that in the pelagic environment is about 0.60, the low Ce anomalies in the Tieqiao chert (0.24-0.46, averaging 0.35) imply that they were deposited in an ocean basin with influence of submarine hydrothermal fluid and no input of terrigenous materials. The vertical variation of the silica abundance in strata (SAIS) in the Middle-Upper Permian strata, together with the Eu anomalies and the ratios of ∑REE/Fe, indicates a relationship between the hydrothermal activity and the Emeishan basalt eruption, and that submarine hydrothermal activity was stronger in the Upper Permian (the Wujiapingian Stage) than in the Middle Permian (the Maokou Stage). 展开更多
关键词 chert GEOCHEMISTRY submarine hydrothermal fluid Emeishan basalt
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