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孟宇群 《中国有色金属学会会刊》2005,15(5):1178-1184
A new hydrometallurgical process for a carbonaceous refractory gold concentrate at ambient temperature and pressure was presented, including grinding-leaching, intensified alkaline leaching(IAL), thiosulfate leaching and cementation by zinc powder. The experimental results show that the grinding-leaching and intensified alkaline leaching process result in the selective oxidation of arsenopyrite and pyrite. The oxidation ratio of As is 96.6%, and 46.7 % for S. The total consumption of NaOH in alkaline leaching is only 28 % of that theoretically calculated under the conditions of full oxidization for the same amount of arsenopyrite and pyrite transforming into arsenates and sulfates, and 83.6% of gold is synchro-dissoluted by thiosulfate self-generated during pretreatment. Since the carbonaceous matter in concentrate possesses a strong capability of preg robbing, the cyanidation process is not suitable for the extraction of gold after pretreatment. However, the gold leaching rate by thiosulfate leaching for 24 h is increased to 91.7% from 0 - 3.2% by ultra-fine grinding without the pretreatment. The recovery of gold by zinc cementation gets to 99.6%. Due to the thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal one. 相似文献
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某低品位铜钼矿石选矿试验 总被引:2,自引:0,他引:2
某铜钼矿石中钼和铜含量较低,分别为0.081%和0.19%,且铜矿物嵌布粒度较细并与钼矿物密切共生,给两者分离带来一定困难。采用钼铜混合浮选-混合精矿精选1次后再磨再精选-铜钼分离流程对该矿石进行选矿试验,混合浮选时以石灰和水玻璃为调整剂、煤油和丁铵黑药为捕收剂,铜钼分离时以石灰、水玻璃和SK为调整剂、煤油为捕收剂,在1段和2段磨矿细度分别为-0.074 mm占70%和-0.045 mm占95%条件下,获得了钼品位为45.30%、钼回收率为84.16%的钼精矿和铜品位为14.28%、铜回收率为89.59%的铜精矿,为该矿石的开发提供了技术依据。 相似文献
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微细粒浸染包裹含砷金矿石金的回收 总被引:2,自引:0,他引:2
提供了一种微细粒浸染包裹含砷金矿石的选冶联合工艺,包括浮选、碱性常温常压强化碱浸预氧化和氰化。先对含砷金矿石进行浮选,获得含金63.80 g/t、产率5.51%、金回收率92.08%的浮选金精矿,然后对金精矿进行超细磨和碱性常温常压强化碱浸预氧化,氧化渣金的浸出率88.56%,金的选冶总回收率81.55%。 相似文献
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提高某镍业公司选厂镍精矿品位的研究 总被引:1,自引:0,他引:1
为解决某镍业公司选厂精矿镍品位较低的问题,在充分研究矿石性质和现场所存在问题的基础上,采用新的浮选流程和药剂制度进行小型试验,通过提高磨矿细度、以选择性好的C-125取代25号黑药与丁基黄药进行组合、用硫酸铵活化镍矿物、将精选中矿集中返回磨矿作业以使矿物充分单体解离等有效手段,在保持镍回收率的前提下,使精矿镍品位得到较大提高。根据小型试验结果进行工业试验,精矿镍品位由现场生产指标最好年度的6.60%提高到7.42%,镍回收率也由87.68%提高到88.87%。精矿镍品位的提高,可增加冶炼处理量,显著提高企业的经济效益。 相似文献
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某金矿石浸渣浮选精矿预氧化及氰化提金研究 总被引:3,自引:0,他引:3
某金矿石氰化尾渣浮选精矿难浸,在<37μm占99.5%的磨矿细度下氰化浸出24h,金的浸出率仅有3.95%。采用常温常压碱性强化预氧化工艺处理后,金的浸出回收率提高到85.85%,炭吸附率99.62%。 相似文献
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