Increasing leaching rate of gold cyanide of two-stage calcination generated from refractory ore containing arsenopyrite and pyrrhotite

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• 作者：Xiao-E Dang ; Wen-Shuai Ke ; Chen Tang ; Jun Lv ; Xue Zhou ; Cheng-Peng Liu
• 关键词：Locked gold ; Hematite ; Pretreatment ; Two ; stage calcination ; Cosolvent B
• 刊名：Rare Metals
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：35
• 期：10
• 页码：804-810
• 全文大小：1,075 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1867-7185
• 卷排序：35

文摘

For the gold locked within hematite in the two-stage calcination, which leads to a low gold leaching rate, the present work is aiming at pretreating the calcination to selectively dissolve hematite. The calcination was pretreated by sulfuric acid with cosolvent B. The factors influencing the hematite dissolution rate were studied, and the pretreatment parameters considered were H₂SO₄ content, B dosage and added time, leaching temperature and time. Simultaneously, mineralogy analysis of the calcination, H₂SO₄ pretreatment residue and cyanide leaching residue were also carried out. Results indicate that the hematite dissolution rate is quicker, the dissolution temperature is lower and the dissolution time is shorter in the role of cosolvent B than without B. At the same time, the gold locked within hematite is effectively released, so the leaching rate of gold cyanide increases about 10 % than that in actual factory production. The results have an actual significance in guiding industrial production.