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| 1 | Simulating experiment on soaking and leaching of Cd in the Niujiaotang Cd-rich Zn deposit, Guizhou Province, China显示文摘CADMIUN is a dispersed element and has long been explored and utilized as a by-product of Pb-Zn ores.Current research on Cd is focused on the following aspects: (i) environmental effects due to the migration and enrichment of Cd as a heavy metal poisonous element in water (rivers, lakes, industrially discharged waste water), sediments and soils. The research paper concerned can be seen in variousjournals of environmental science; and (ii) exploration of the existing forms of Cd and its independentminerals and ordinary geological problems. However, many researchers have paid little attention tothe geochemical behavior of Cd and its environmental effects under supergene weathering-leaching conditions in Cd-bearing Pb-Zn deposits. Cd can be separated from Zn in the supergene weathering processand its sulfate CdS0-4 is easy to dissolve in water. Our preliminary studies showed that Cd can be enrichedto some extent under supergene weathering conditions in Niujiaotang deposit. The stronger the extent | YE LJn and LlU Tiegeng Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China | 1999 | Chinese Science Bulletin1999，44，S2： | 7 |
| 2 | Geochemical characteristics of the independent cadmium deposit, Niujiaotang, Duyun, Guizhou显示文摘A large independent cadmium deposit has been found at Niujiaotang, Duyun, in recent years. To the bestof our knowledge this represents the first case of its kind in the world. With a reserve of over 5 000 tonsof cadmium, the deposit is unique in its high concentrations of cadmium which are tens of to over onehundred times higher than in ordinary cadmium mineralizations associated with Pb-Zn deposits. 1 Geological characteristics The Niujiaotang deposit is located at the southwest margin of the Yangtze Plate. The region consistsof a thick sedimentary cover ranging from Sinian to Triassic in age overlying unconformably the basementof Mid-Proterozoic metamorphosed volcanic-sedimentary rocks. Lower Cambrian carbonate strata arcoutcropped in the mining district. Cadmium mineralizations, with seven layers recognizable, are devel- | LIU Tiegeng~1, YE Lin~1 and CHEN Guoyong~2 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Team No. 104, Bureau of Geology and Mineral Resources, Duyun, Guizhou 558000, China | 1999 | Chinese Science Bulletin1999，44，S2： | 2 |
| 3 | Trace and minor elements in sphalerite from base metal deposits in South China: A LA-ICPMS study显示文摘 | Lin Ye Nigel J. Cook Cristiana L. Ciobanu Liu Yuping Zhang Qian Liu Tiegeng Gao Wei Yang Yulong Leonid Danyushevskiy | 2011 | Ore Geology Reviews2011，，4： | 1 |
| 4 | Petrogenesis ofbismuth minerals in the Dabaoshan Pb-Zn polymetallic massive sulfide deposit, northern Guangdong Province, China 显示文摘 | YE Lin LIU Tiegeng YANG Yulong | 2014 | Journal of Asian Earth Sciences2014，82，： | 1 |
| 5 | Existing state of Cd in the Niujiaotang Cd-rich zinc deposit, Guizhou, China显示文摘As a dispersed element, cadmium is difficult to enrich and mineralize. As the Cd tetrahedron is similar tothat of Zn in covalent radius and crystal structure, both the elements possess similar geochemical habits.Cd is present mainly as isomorphous impurity in sphalerite. So Cd, as an associated element, occurslargely in Pb-Zn deposits. Current research both at home and abroad is focused on the environmental effect of Cd, but little work has been done on the mechanism of enrichment and mineralization of Cd. Theresearch papers available are mostly restricted to the ordinary geochemical characteristics of CdFrom the end of 1980s to the early 1990s, independent ore deposits of Te, Tl and other dispersed elements were discovered in the region of Southwest China. Prof. Tu Guangzhr proposed that dispersed elements can form their independent ore deposits. It has been realized that the dispersed | YE Lin and LlU Tiegeng Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China | 1999 | Chinese Science Bulletin1999，44，S2： | 1 |
| 6 | A study on the distribution characteristics and existing states of cadmium in the Jinding Pb-Zn deposit,Yunnan Province,China显示文摘The distribution characteristics and existing state of cadmium in the Jinding Pb-Zn deposit were studied. It was discovered that Cd was mainly distributed in sphalerite as an isomorphic impurity. There was a good correlation between Cd and Zn in the primary ore. With the oxidation and resolution of pyrite, sphalerite, sulfide, and etc., many secondary minerals, such as colloform sphalerite and smithsonite, were formed. The distribution of Cd is not symmetrical, and enrichment and dilution were observed in partial area of the oxidation zone in the deposit. Cd, except in external pore space or cracks of secondary minerals as independent minerals, such as greenockite, was mainly distributed in sphalerite as an isomorphic impurity in the secondary sphalerate and smithsonite in the oxidation zone. The research showed that Cd showed a very strong active transfer ability in the oxidation process, not only indicating that supergene leaching might be the main reason for Cd enrichment in some Pb-Zn deposits, but also reflecting that Cd was easily mobilizeed and transferred to pollute ore areas in the oxidation process. Furthermore, Cd in oxidation ore was more easily mobilized and transferred to induce bad hazards for ore areas with the effect from AMD which was produced from oxidation of sulfides. | YE Lin CHENG Zengtao PAN Ziping LIU Tiegeng GAO Wei | 2010 | Chinese Journal Of Geochemistry2010，29，3： | 1 |
| 7 | Shpalerite chemistry, Niujiaotang Cd-rich Zinc deposit, Guizhou, southwest China显示文摘 | Ye Lin Liu Tiegeng | 1999 | Chinese journal of geochemistry 19991999，6268，： | 1 |
| 8 | Trace and minor elements in sphalerite from base metal deposits in South China: A LA-ICPMS study显示文摘 | Lin Ye Nigel J. Cook Cristiana L. Ciobanu Liu Yuping Zhang Qian Liu Tiegeng Gao Wei Yang Yulong Leonid Danyushevskiy | 2011 | Ore Geology Reviews2011，，4： | 1 |
| 9 | A simulation experimental study on oxidative kinetics of sphalerite under hypergene condition显示文摘The sphalerite oxidative kinetics under hypergene condition was simulated and studied by means of a mixed flow reactor over a pH range of 1.0 7.8,and at dissolution temperatures from 20 to 55℃,ferric ion concentrations from 1.0×10-5 to 1.0×10-2 mol/L,O 2 flux of 0.5 L/min,and oxidants of ferric ion and O 2.It is indicated that with ferric ion as oxidant,the oxidation rate of sphalerite increases with increasing ferric ion concentration,temperature and decreasing pH value,and under the studied conditions,the dissolution rates of Zn and Cd are approximately identical,with the values of activation energy being 41.75 and 42.51 kJ·mol-1,respectively,suggesting that the oxidation rate of sphalerite is controlled by chemical reactions on mineral surface.However,with O 2 as oxidant,the oxidation mechanism of sphalerite varies with pH value.Oxidation rate decreases with increasing pH value when pH is lower than 5.95,whereas the increase of pH value results in an increase in oxidation rate when pH value is higher than 7.The oxidation rate of sphalerite can be expressed as:R Zn =10 1.1663 [Fe3+] 0 0.154 ·[H+] 0.2659 ·e-41.75/RT or R Cd =10 1.7292 [Fe3+] 0 0.170 ·[H+] 0.2637 ·e-42. | PAN Ziping YE Lin LIU Tiegeng CHENG Zengtao GAO Wei YANG Yulong | 2012 | Chinese Journal Of Geochemistry2012，31，4： | 0 |
| 10 | The environmental effect of cadmium-rich Pb-Zn deposit, as exemplified by Niujiaotang Cd-rich Zn deposit, Guizhou, China显示文摘 | Lin YE Ziping PAN Chaoyang LI Tiegeng LIU | 2006 | Chinese Journal Of Geochemistry2006，25，B08： | 0 |
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