| Anodic Reaction of Arsenopyrite in Ammoniacal Solution |
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| 作者姓名： | 方兆珩 于景开 |
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| 作者单位： | Institute of Chemical Metallurgy，Chinese Academy of Sciences，Beijing l00080，China |
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| 基金项目： | Supported by the National
Natural Science Foundation of China (No.: 59674023) |
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| 摘 要： | 1 INTRODUCTIONArsenopyrite is the most common sulfide mineral in arsenic refractory gold ores. The ore refractoriness mainly results from dissemination of fine grained gold in arsenopyrite and other sulphide minerals. Oxidation of sulfides by either pyro-metallurgical or hydrometallurgical tech- niques to render these ores amenable to the standard cyanidation is therefore universally effective in gold extraction. A newly developed pretreating technology for arsenopyrite-type ores is oxyge…
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| 关 键 词： | 阴极过程 砷黄铁矿 氨水 阳极反应 |
| 文章编号： | 1009-606X(2001)01-0040-05 |
| 修稿时间： | 2000年3月28日 |
Anodic Reaction of Arsenopyrite in Ammoniacal Solution |
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| FANG Zhao-heng,YU Jing-kai.Anodic Reaction of Arsenopyrite in Ammoniacal Solution[J].Chinese Journal of Process Engineering,2001,1(1):40-44. |
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| Authors: | FANG Zhao-heng YU Jing-kai |
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| Abstract: | Anodic dissolution of arsenopyrite in ammoniacal solution has been investigated by electrochemical methods. The process is an irreversible reaction with formation of a ferric oxidized film and is retarded by the film. The process rate is controlled by the electrochemical reaction on the electrode surface in the lower temperature range, or alternatively by the diffusion through the film in the higher temperature range. The overall reaction has 14 electron transferred and can be expressed by FeAsS + 11H2O = Fe(OH)3 + SO42- + HAsO42- + 18H+ + 14e-, and the reaction involves two steps: (1) FeAsS + 7H2O = Fe(OH)3 + HAsO42- + S0 + 10H+ + 8e- , (2) S0 + 4H2O = SO42- + 8H+ + 6e- . |
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| Keywords: | arsenopyrite anodic process ammoniacal solution |
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