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《GEOCHIMICA》 1996-04
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ADSORPTION OF SILVER IONS ONTO SULFIDE MINERALS AND ITS SIGNIFICANCE IN MINERALIZATION

WuDaqing;PengJinlian;ChenGuoxi (Guangzhou Institute of Geochemistry,Chinese Academy of Sciences, Guangzhou 510640)  
The experiments of the isotherm adsorption of silver ions by sulfide minerals(galena,sphalerite, chalcopyrite and stibnite)and synthetic sulfides (PbS,ZnS and Sb2O3)are carried out at pH=3, t=50°C and ionic strengh I=0.1.The results show that the sulfides are the good capture agents for silver ions and they can concentrate the silver ions from the solution to the solids(sulfides)about 5-6 orders in magnitude. The adsorption density of sulfide minerals with grain size 56-84μm is as follows: galenachalcopyritestibnitesphalerite.The larger capicity is expected if the mineral grain is more fine. Actually, for the adsorption of silver ions by new precipitated PbS, ZnS and Sb2S3 the capacity is as high as 29.7 mol /kg.The silver concentration in solution is always less than 0.01 mg/L after equilibrium which is less than the flame AAS sensitivity. It means that these sulfides can concentrate the silver ions from solution to solids for more than 6 orders in magnitude. When the temperature raises the adsorption capacities of all sulfides increase linearly. As t74°C,the adsorption capacity is:stibnitegalenachalcopyritesphalerite. This can be proved by the silver contents in sulfides found in polymetallic ore deposit except for stibnite. The results explain why the silver exists always in the sulfide minerals and is commonly associated with stibium and exsits in form of antimony sulfosalt minerals. The results also suggest that the adsorption of silver ions by sulfides plays an important role in silver concentration in the sulfides during the mineralization of polymetallic ore deposits.
【Fund】: 国家自然科学基金
【CateGory Index】: P618.205
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