共查询到17条相似文献,搜索用时 284 毫秒
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采用两段充气预处理-非氰化工艺浸出微细浸染型金矿,研究了浸出条件对金浸出效率的影响。结果表明,在氧化和碱浸预处理2个阶段充气可提高金浸出率;氧化预处理2 h后,加入氢氧化钠(20 kg/t)碱浸预处理4 h,加入氧化钙(40 kg/t)替代氢氧化钠,用TY-3浸出剂(8 kg/t)浸出4 h,金浸出率可达87.21%。浸出渣的物相分析、扫描电镜观察及X射线能谱分析结果显示,硅酸盐、碳酸盐中的金可被有效浸出,浸出渣中的石英、黄铁矿表面发生腐蚀,部分黄铁矿氧化。 相似文献
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湖南某高砷难处理金精矿的细菌氧化-氰化提金实验研究 总被引:1,自引:0,他引:1
湖南某高砷金精矿属于难处理矿石,含砷11.28%,含金66.18g/t,金的直接浸出率仅为21.91%.通过该样品5%、10%、15%、20%矿浆浓度的细菌氧化试验,发现金精矿砷的氧化率达到93%以上.细菌氧化渣的金浸出率随着矿浆浓度的增大而降低,5%矿浆浓度下细菌氧化渣的金浸出率为93.15%;10%矿浆浓度下细菌氧化渣的金浸出率为92.46%;15%矿浆浓度下细菌氧化渣的金浸出率为90.50%;20%矿浆浓度下细菌氧化渣的金浸出率为87.58%,比未经处理时金的直接氰化浸出率21.91%有了很大的提高,预处理效果很好. 相似文献
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采用高温焙烧、硫脲-硫氰酸钠浸出难处理金矿中的金,研究焙烧温度、硫氰酸钠浓度、硫脲(Tu)浓度、Fe3+浓度、pH值、浸出温度和时间对金浸出率的影响,得到混合体系浸金的最优条件,并研究浸出过程中硫氰酸钠和硫脲的稳定性。结果表明:金的浸出率达到93.1%,超过相同条件下单一体系中的浸出率之和,硫脲与硫氰酸钠摩尔比对金浸出率和金电极稳定电位影响较大;硫氰酸钠使硫脲的稳定性降低,而硫脲使硫氰酸钠的稳定性增强。 相似文献
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Altansukh Batnasan Kazutoshi Haga Atsushi Shibayama 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(2):124-128
This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching from WPCB residue after HPOL included the sulfuric acid concentration, thiourea concentration, oxidant concentration, leaching temperature, and leaching time. Recovery of gold, silver, and palladium of 100%, 81%, and 13% from the WPCB residue sample was achieved by thiourea leaching under optimized conditions. The results show that the efficiency of precious metal dissolution from the WPCB sample using thiourea solution depended strongly on the concentration of both thiourea and oxidant. 相似文献
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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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磁化焙烧对氰化尾渣中金、铁回收的影响(英文)EI北大核心CSCD 总被引:2,自引:0,他引:2
对氰化尾渣的焙烧预处理及其对有价金属综合回收的影响进行了研究。结果表明:当焙烧温度为750℃、焙烧时间为1.25h、还原剂添加量为6%时,铁的磁化率为86.27%,金的浸出率达到46.14%。结合矿物构造与赤铁矿磁化焙烧原理,探讨了焙烧对金浸出影响的机理,认为赤铁矿磁化焙烧后解离出的包裹金,是提高金浸出率的主要来源。 相似文献
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难处理金矿的处理现状 总被引:4,自引:0,他引:4
难处理金矿直接氰化金的回收率低,为了提高回收率,必须采取一定的方法进行处理。本文简要地分析了难处理金矿的难浸原因,介绍了目前常用的处理难处理金矿的方法,详细地介绍了非氰化法、强化氰化、预处理法、火法熔炼法处理难处理金矿的研究方法和研究进展。介绍了各种方法的优缺点及应用现状和前景。 相似文献