共查询到17条相似文献,搜索用时 234 毫秒
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高砷硫化金矿真空脱砷工艺考察 总被引:4,自引:2,他引:2
用真空脱砷法处理湖南黄金洞金矿的高砷硫化金精矿,考察了溫度和残压对脱砷率的影响,分析冷凝物形态,提出了最佳脱砷条件。最后用硫脲浸金对脱砷效果作验证。 相似文献
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目前世界上有约1/3的黄金产自难处理金矿,高硫砷的金矿是公认的难处理矿石之一。目前我矿主要采用细菌氧化法处理金精矿。通过对Fe2+氧化速率的测定可以了解铁硫杆菌的生长情况和氧化特性。细菌槽水样中铁的分析就成为了日常必需分析 相似文献
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某高砷富银铋硫矿为硫化矿混合精矿,表面受到浮选药剂污染,各种矿物之间的可浮性相近,给分离带来不利影响。采用“混合精矿加温脱药-脱药精矿铋银优先浮选-铋银尾矿砷硫活化浮选”工艺流程进行处理,采用高效银铋捕收剂SAC,全流程实验获得的银铋精矿含银4386 g/t、铋13.06%、砷0.61%,回收率为银88.52%,铋85.51%;砷硫精矿含硫36.37%、砷9.69%,回收率为硫93.71%,砷97.57%。实现了混合精矿中铋银砷硫的综合回收。 相似文献
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针对西部黄金伊犁有限责任公司选矿厂氧化后的金精矿品位高,硫砷脱除不完全,直接浸出率低等问题,进行了试验研究。在试验研究基础上,对原有处理工艺进行了改造,增加了再磨、硫酸铵预处理等工序。通过生产实践,难处理金精矿的浸出率达到了95%以上,创造了较大的经济效益。 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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不同含砷类型金矿的细菌氧化-氰化浸出 总被引:1,自引:0,他引:1
对含砷类型不同的金精矿和单矿物进行细菌氧化-氰化浸出研究,分析毒砂和雄黄对金精矿细菌氧化-氰化浸出效果的影响。结果表明:在细菌氧化过程中,含砷金精矿中的毒砂易被氧化分解,经过192 h的细菌氧化后,脱砷率可达93.10%;而雄黄无法被细菌氧化分解,且影响细菌活性,延长浸矿的停滞期;在氰化浸出过程中,毒砂非常稳定,不参与任何副反应;而雄黄易与CN-及保护碱发生副反应,且产生的沉淀物质会在金粒表面形成薄膜,从而降低氰化浸出效率。 相似文献
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1 INTRODUCTIONCyanidationprocess ,characterizedbyeffectivenessandlowoperatingcost,asaconventionaltechnologyforgoldextractionfromores ,hasbeenusedinindustryforover 10 0years .Howeverthecyanideisahighlytoxicchemical,andcommercialcyanidationprocessislimitedint… 相似文献
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对某难处理金精矿进行了热压预氧化-氰化浸金实验,探讨热压预氧化温度、时间、氧化分压和矿浆浓度对金浸出率和氰化钠耗量的影响。结果表明,在粒度-44μm占90.74%、温度220℃、矿浆浓度25%、氧分压0.8 MPa和转速750 r/min条件下预氧化2.5 h,砷主要以稳定的结晶状砷酸铁或者臭葱石形式被固定在氧化渣中;预氧化渣在矿浆浓度33%、pH=10~11、初始氰化钠浓度0.3%和活性炭浓度25 g/L条件下氰化浸出24 h,与金精矿直接氰化相比,浸出率由11.21%提高至95.75%,氰化钠耗量从46.99 kg/t降低至1.36 kg/t。 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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Kafui Nyavor B.S. Nosa O. Egiebor Ph.D. 《JOM Journal of the Minerals, Metals and Materials Society》1991,43(12):32-34
Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ores and concentrates (usually those containing both carbonaceous and sulfide materials), roasting remains the most effective pretreatment before cyanidation. However, the serious environmental damage that could result from the emission of SO2 and As2O3 makes roasting an unattractive pretreatment step. In an effort to develop a technique having lower SO2 emissions, a lime agglomeration roast (LAR) pretreatment process was investigated. The technique involves the agglomeration of calcium-based SO2 sorbent with the refractory ore or concentrate before roasting. The results of the LAR pretreatment followed by cyanidation indicate that up to 95 percent of the sulfur dioxide can be captured and more than 90 percent gold extraction can be achieved. 相似文献