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| Study and Application of Additive in Roasting Process for Silver Bearing Refractory Gold Concentrates |
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Received:July 22, 2015
Revised:July 22, 2015
Accepted:July 23, 2015
Published Online:December 24, 2015
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| DOI：10.3969/j.issn.1007-7545.2016.01.008 |
| KeyWord:roasting; additive; leaching rate; refractory gold concentrates; silver phase |
| Author | Institution |
| ZHONG Shui-ping |
紫金矿业集团股份有限公司 低品位难处理黄金资源综合利用国家重点实验室 |
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| Abstract: |
| The effects of type and dosage of additive, roasting temperature and duration on leaching rates of gold, silver and copper were investigated in treating process of silver-bearing refractory gold concentrates. In addition, the thermodynamics of roasting reaction and silver phase were analyzed. The results show that leaching rate of silver is improved from 43.62% without NaOH addition to 75.65% with NaOH dosage of 2% when roasting temperature is 650 ℃ and roasting time is 2 h. The leaching rate of gold and copper is also improved in varying degrees, which is 91.73% and 92.50% respectively. The analysis of thermodynamics of roasting reaction and silver phase shows that adding NaOH can reduce the silicate bound for silver. The industrial practice shows that with addition of NaOH as additive in roasting process of silver bearing refractory gold concentrates can achieve good technical-economic indexes. |
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