难浸砷金精矿的碱性常温常压预氧化
Alkaline Pre-oxidation for Refractory Gold Arsenosulfide Concentrates under Normal Temperature and Pressure
查看参考文献11篇
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文摘
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本文提供了1种难浸金精矿的湿法预氧化新工艺,它包括细磨、强化碱浸预氧化、氰化和炭吸附.在螺旋搅拌式塔式磨浸机中,先将目的难浸金精矿细磨至98%<37μm,然后在40%的矿浆质量浓度、11℃的环境温度和0.1 MPa的环境压力下强化碱浸24 h,NaOH的消耗量为88 kg/t矿,仅为相同氧化率条件下将砷硫氧化成砷酸盐和硫酸盐所需理论碱耗量的30%.预氧化完成后经36 h的氰化漫出和炭吸附,金的浸出率从预氧化前的24.6%提高到95.4%,金的吸附率99.2%,NaCN的消耗4 kg/t矿.整个提金工艺的成本约300元/t矿. |
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其他语种文摘
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A new hydrometallurgical pre-oxidation process for the refractory gold arsenosulfide concentrates under normal temperature and pressure was presented. It comprised fine grinding, intensified agitation alkali-leaching, cyanidation and adsorption. In a stirring-type pulverizing-leaching tower mill, the concentrate was ground to <37 umof 98 %, then the intensified alkaline leaching for 24 h by NaOH of 88 kg/t ore was carried out in enhanced agitation tanks with the pulp solid content of 40% at the ambient temperature of 11 ℃ and the ambient pressure of 0.1 MPa. The experimental results showed that the total consumption of NaOH in alkaline leaching was only 30% of those theoretically calculated under the same conditions of full oxidization in which arsenic was oxidized to arsenate and sulfur to sulfate. After alkaline leaching, cyanidation and adsorption were carried out for 36 h. The dissolution of gold by NaCN was increased to 95.4% from 24.6% without pre-oxidation, and the adsorption of gold by activated charcoal of 99.2% was reached. The consumption of NaCN was 4 kg/t ore. The extraction cost of gold for this process was about 300 yuan/t ore. |
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来源
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贵金属
,2004,25(3):1-5 【扩展库】
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关键词
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冶金原料与预处理
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难浸砷金精矿
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常温常压
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预氧化
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地址
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中国科学院金属研究所特种制备与加工技术研究部, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-0676 |
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学科
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冶金工业 |
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基金
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辽宁省自然科学基金
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文献收藏号
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CSCD:1594857
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参考文献 共
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