内蒙古某金矿尼尔森重选—低氰浸出试验研究

金属矿山 ›› 2021, Vol. 50 ›› Issue (07): 119-123.

内蒙古某金矿尼尔森重选—低氰浸出试验研究

朱一民^1，2 葛文成^1，2 张淑敏^1，2杨新华³刘杰^1，2

1. 东北大学资源与土木工程学院，辽宁沈阳 110819；2. 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心，辽宁沈阳 110819；3. 山东黄金冶炼有限公司，山东烟台 264010

出版日期:2021-07-15 发布日期:2021-08-06

Nielsen Gravity Concentration Combined with Low Cyanide Leaching Test Research for a Gold Mine in Inner Mongoli

ZHU Yimin^1，2 GE Wencheng^1，2 ZHANG Shumin^1，2 YANG Xinhua³ LIU Jie^1，2

1. School of Resources and Civil Engineering， Northeastern University， Shenyang 110819， China； 2. National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources， Shenyang 110819， China； 3. Shandong Gold Smelting Co.， Ltd.， Yantai 264010， China

Online:2021-07-15 Published:2021-08-06

摘要/Abstract

摘要： 内蒙古某金矿含金2.83 g/t，目前采用氰化钠浸出—树脂吸附工艺提金，浸渣总氰含量高达50 mg/kg。为降低氰化物用量，使得浸渣氰化物浓度达到充填技术标准，采用尼尔森重选—重选尾矿低氰浸出工艺对内蒙古某金矿进行提纯试验研究，重点考察重选尾矿的磨矿细度、金欣用量、氧化钙用量、液固比及浸出时间对浸出效果的影响。结果表明：①在磨矿细度为-0.043 mm占87%、分选G值为80 G、流态化水量为3 L/min、给矿浓度为50%的条件下，采用“1粗2扫”工艺流程进行尼尔森重选，金累计回收率达到55.91%，金累计品位为35.48 g/t，重选尾矿含金1.34 g/t。②对重选尾矿进行低氰浸出条件试验，确定适宜的磨矿细度为-0.043 mm占79%，氧化钙用量为5 kg/t，金欣用量为1 200 g/t，浸出时间为36 h，液固比为1.5 mL/g，此时金浸出率为91.88%，重选—浸出工艺流程综合回收率达96.42%；在上述条件下，采用树脂吸附处理贵液，金吸附率为86.94%，合计重选—浸出—吸附全流程的金综合回收率为91.13%，指标良好。试验最终获得的浸渣总氰浓度为0.50 mg/kg，达到尾矿充填技术标准。

关键词: 难处理金矿石, 尼尔森重选, 低氰浸出, 金回收率

Abstract: A gold deposit in Inner Mongolia contains gold of 2.83 g/t.At present，the leaching process of sodium cyanide and resin adsorption is adopted to extract gold，and the total cyanide content in the leaching residue is as high as 50 mg/kg. In order to reduce the dosage of cyanide， Nielsen gravity separation and low-cyanide leaching process for tailings tests were conducted，so as to meet the filling technology standard. The condition including tailings grinding fineness， dosage of Jinxin and calcium oxide，the liquid-solid ratio，leaching time on leaching effect were studied. The results showed that:① Under the conditions of grinding fineness of -0.043 mm accounting for 87%，separation G value of 80 G，fluidized water flow of 3 L/min and feeding concentration of 50%， the process of "one roughing and two scavenging" was used in Nelson gravity separation.The cumulative recovery rate of gold reached 55.91% and the cumulative grade of gold was 35.48 g/t. Gold grade of gravity separation tailings is 1.34 g/t.② Low cyanide leaching conditions tests for gravity separation tailings were carried out. With the optimum grinding fineness -0.043 mm accounting for 79%，the dosage of calcium oxide of 5 kg/t，the dosage of Jinxin of 1 200 g/t，the leaching time of 36 h，the liquid-solid ratio of 1.5 mL/g，the gold leaching rate was 91.88% at this time. The comprehensive recovery rate of gravity separation and leaching process reached 96.42%. Under the above conditions， the adsorption rate of gold was 86.94% when the precious solution was treated by resin adsorption，and the comprehensive recovery rate of gold in the whole process of gravity separation， leaching and adsorption was 91.13%，indicating good indexes. The total cyanide concentration of the leaching residue was 0.50 mg/kg，which reached the technical standard of tailings filling.

Key words: refractory gold ore, Nielsen gravity concentration, low cyanide leaching, gold recovery rate

朱一民, 葛文成, 张淑敏, 杨新华刘杰, . 内蒙古某金矿尼尔森重选—低氰浸出试验研究[J]. 金属矿山, 2021, 50(07): 119-123.

ZHU Yimin, GE Wencheng, ZHANG Shumin, YANG Xinhua LIU Jie, . Nielsen Gravity Concentration Combined with Low Cyanide Leaching Test Research for a Gold Mine in Inner Mongoli[J]. Metal Mine, 2021, 50(07): 119-123.

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