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湖北某低品位含碳质金矿碱性加压预氧化—氰化浸出试验研究

  • 康健|姚泽钰|胡良训|汪岸|黄鹏|刘爽|朱丹
  • 作者单位:
  • 自然资源部稀土稀有稀散矿产重点实验室&湖北省地质实验测试中心|西南能矿建设工程有限公司|西南能矿建设工程有限公司|自然资源部稀土稀有稀散矿产重点实验室&湖北省地质实验测试中心|自然资源部稀土稀有稀散矿产重点实验室&湖北省地质实验测试中心|自然资源部稀土稀有稀散矿产重点实验室&湖北省地质实验测试中心|自然资源部稀土稀有稀散矿产重点实验室&湖北省地质实验测试中心
  • 基金项目:

  • 湖北省自然科学基金项目(2023AFD208)
  • 详细信息:

  • 作者简介:
  • 康健(1988—),男,工程师,研究方向为稀土稀有稀散元素选冶技术;E-mail:516447146@qq.com
  • 通讯作者:
  • 刘爽(1981—),女,高级工程师,博士,研究方向为选矿工艺;E-mail:20214175@qq.com
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Experimental study on alkaline pressure pre-oxidation-cyanide leaching of low-grade carbonaceous gold ore in Hubei Province

  • English Author:
  • Key Laboratory of Rare Mineral,MNR&Hubei Province Geological Test Center|SWEM Construction Engineering Co.,Ltd.|SWEM Construction Engineering Co.,Ltd.|Key Laboratory of Rare Mineral,MNR&Hubei Province Geological Test Center|Key Laboratory of Rare Mineral,MNR&Hubei Province Geological Test Center|Key Laboratory of Rare Mineral,MNR&Hubei Province Geological Test Center|Key Laboratory of Rare Mineral,MNR&Hubei Province Geological Test Center
  • Unit:
  • 摘要
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  • 参考文献

摘要:

湖北某尾矿金品位0.325 g/t,含碳0.49 %,属典型低品位含碳质金矿。工艺矿物学表明,矿石中主要矿物组成为石英、高岭石和伊利石,79.59 %的碳质分布于有机碳中。采用直接氰化浸出、表面钝化—氰化浸出、竞争吸附—氰化浸出、化学氧化预处理—氰化浸出等浸出工艺,金浸出率均不足20 %。劫金性能试验表明,该尾矿劫金指数为1.462 g/t,属于中劫金类金矿,使用碱性加压预氧化工艺能大大降低碳质的劫金效应,提高氰化浸出金浸出率。在磨矿细度为-0.074 mm占比80 %,氧分压为1 000 kPa,液固比2∶1,氢氧化钠用量为5 %,加压预氧化时间为6 h,搅拌速度为200 r/min的条件下进行碱性加压预氧化—氰化浸出,金浸出率达到64.15 %。

关键词:

难处理金矿;含碳质金矿;加压预氧化;劫金效应;氰化浸出

Abstract:

The gold grade of a tailings sample in Hubei is 0.325 g/t,with a carbon content of 0.49 %,belonging to typical low-grade carbonaceous gold ore.The mineralogy indicates that the main minerals in the ore are quartz,kaolinite,and illite,with 79.59 % of carbon distributed in organic carbon.Various leaching processes such as direct cyanide leaching,surface passivation-cyanide leaching,competitive adsorption-cyanide leaching,and chemical oxidation pre-treatment-cyanide leaching were employed,but the gold leaching rates were all less than 20 %.The preg-robbing performance test shows that the tailings have a preg-robbing index of 1.462 g/t,belonging to the medium preg-robbing category.The alkaline pressure pre-oxidation process significantly reduced the carbonaceous preg-robbing effect and increased gold leaching efficiency.Under specific conditions of grinding fineness at -0.074 mm with 80 % distribution,oxygen pressure of 1 000 kPa,liquid-solid ratio of 2∶1,sodium hydroxide dosage of 5 %,and pressure pre-oxidation time of 6 h at an agitation rate of 200 r/min,the gold leaching rate reached 64.15 % by alkaline pressure pre-oxidation-cyanide leaching.

Keywords:

refractory gold ore;carbonaceous gold ore;pressure pre-oxidation;preg-robbing effect;cyanide leaching