某含金银矿石氰化提金试验

对某含金银矿石进行选矿流程研究,首先要确定氰化浸出选矿工艺,在较佳的条件下,可以同时提高金银的浸出率。然后进行吸附试验,吸附分别选用树脂和活性炭,通过实验结果对比,最终选用活性炭进行吸附,可以同时提高金银的吸附率。     

湿法提金技术发展历程及应用现状

湿法提金技术由于具有工艺成熟、适应性强、相对于火法能耗低等优点,被广泛应用于黄金生产中.介绍了氰化法、硫脲法、氯化法、硫代硫酸盐法、多硫化物法及石硫合剂法等湿法提金技术的原理,分析了其优缺点,总结了湿法提金技术的发展历程及应用现状,展望了湿法提金技术的发展前景.     

Low pH cyanidation of gold

Lime is used in CIP/CIL slurries to increase the pH, which partially stops the formation of aqueous hydrogen cyanide. Hydrogen cyanide gas can be evolved directly from the pulp surface or purged from the leach tank in oxygen or air that is sparged into the tanks to provide oxygen for the dissolution of gold.Savings in lime consumption can be achieved by leaching at a reduced pH, especially in aqueous solutions high in magnesium such as to be found in the Kalgoorlie Goldfields in Western Australia, but a greater percentage of cyanide is then present as aqueous hydrogen cyanide. Another proposed procedure to reduce lime consumption is closed tank leaching where a reduced pH or the natural pH of the ore is used and hydrogen cyanide loss is prevented by the closed vessel.The dissolution rate of pure gold as a function of pH for constant total cyanide concentration has been determined. Dissolution was directly proportional to the concentration of the cyanide ion present, with the contribution to dissolution from aqueous hydrogen cyanide too low to be measured.Ore leached in high magnesium, hyper-saline, process water showed increased gold dissolution at low pH compared to the pure gold. Reducing pH caused more cyanide to be consumed by the pulp but did not significantly increase the amount lost to the atmosphere.     

小秦岭某矿石金、铜回收试验研究

选矿试验考察了磨矿细度、矿浆pH值、浮选药剂制度等条件对选金回收率的影响。试验结果表明：采用组合捕收剂浮选金,在最佳试验条件下,该矿石金的浮选回收率可达到90％;采用浮选铜、硫分离,既可回收金精矿中的铜,又可消除铜对金氰化浸出的影响。试验采用的工艺流程及浮选药剂制度适应该矿石特性,选别指标理想。     

某贫硫化物复杂含金矿石选冶技术研究与应用

吉林省临江市金银矿对现场生产工艺流程进行了改造。采用浮选-浮尾氰化炭浸工艺流程取代了原全泥氰化炭浸生产工艺流程,金的回收率由改造前的50．96％提高到82．54％,同时在不增加设备和投资的前提下,选厂处理能力由原来的100t／d左右提高到180t／d,生产成本由原来的222．76元／t,降低到177．31元／t,每年可为企业增加效益1157．40万元。     

Influence of copper minerals on cyanide leaching of gold

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从锰银共生氧化矿中提取锰、银工艺研究

研究了用硫铁矿作还原剂,在酸性条件下浸出锰银氧化矿。结果表明:锰浸出率大于92.5%,浸出液可用于制备工业碳酸锰(锰质量分数45.71%);银留在浸锰渣中,通过重选+浮选可回收过量硫铁矿;对重选细渣和浮选尾渣氰化浸出银,银浸出液以锌粉置换产出银泥(银质量分数92.18%);全流程锰、银回收率分别为88.42%和86.25%。     

东北寨难浸金矿提金工艺研究

东北寨金矿为古砷碳镘细粒浸染贫金矿石,直接浸金的金浸出率几乎为零 采用阶段窖矿、载体浮选工艺得金品位18~92 g/t的精矿。金回收率91.52,并甩掉了大量尾矿。浮选精矿焙烧--氧化提金工艺获得了良好指标,金总回收率达85.32%     

某含铜金矿石选矿试验研究

针对某含铜金矿石,进行了直接全泥氰化、氨浸—氰化、酸浸—氰化、浮选试验研究。其结果表明,采用"先硫后氧"优先浮选—浮选尾矿氰化工艺流程,获得了较好的技术指标,金回收率可达到93.41%,银回收率达到68.81%。同时,对浮选所得的两种精矿进行氰化试验探索,也获得了较好的浸出指标。     

从氰渣中浸取金、银试验研究

对采用高酸催化氧化浸出氰渣中的氧化铁,从浸铁渣中用常规氰化浸出金、银等贵金属进行了研究.氰渣高酸催化浸出时保持35%的矿浆浓度、加入1.3倍硫酸理论用量、在100℃下反应2.5h,铁的浸出率可达97.80%;浸铁渣常规氰化金、银的浸出率分别可达87%和80%.该方法可有效浸出回收氰渣中的金、银.