A new concept of the biohydrometallurgical technology for gold recovery from refractory sulfide concentrates
A new concept of the biohydrometallurgical technology for gold recovery from refractory sulfide concentrates
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DOI：
10.1016/j.hydromet.2016.05.011
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发表时间：
2016-09-01
期刊：
影响因子：
4.7
通讯作者：
Muravyov, Maxim I.
中科院分区：
文献类型：
--
作者：
Fomchenko, Natalya V.;Kondrat'eva, Tamara F.;Muravyov, Maxim I.
提出并验证了生物湿法冶金从难处理硫化精矿中回收金的新概念。该技术采用两步法氧化含金硫化物精矿。第一步是利用第二步生产的含铁溶液在高温下浸出生物铁。第二步是由嗜酸化养微生物对第一步产物进行生物氧化。采用一种含磁黄铁矿、毒砂、黄铁矿和锑矿的浮选精矿进行了研究。研究了温度对生物铁浸出精矿的影响。在80℃时观察到铁和亚铁浓度变化的最大速率，在第一个浸出循环的前40分钟内分别为44.3和32.2 g L-1 h（-1）。80℃下生物源铁预浸（100 min） 2次循环后，所有硫化物矿物的铁、砷和硫的氧化水平分别为643、31.1和45.4%。对两步法和传统的一步法工艺进行了比较，提出了新工艺流程。在生物氧化4 d时，一步法和两步法的金回收率分别为67.8%和93.0%，而在生物氧化8 d时，一步法和两步法的金回收率分别为82.4%和94.1%。采用生物生铁步骤对精矿进行预浸，缩短了后续生物氧化所需时间，提高了金回收的经济效益。(C) 2016 Elsevier B.V.版权所有
A new concept of a biohydrometallurgical technology for gold recovery from refractory sulfide concentrates was proposed and substantiated. The technology implies a two-step process for oxidation of gold-bearing sulfide concentrates. The first step is leaching with biogenic ferric iron at elevated temperature using the ferric iron-containing solution produced during the second step. The second step is biooxidation of the products of the first step by acidophilic chemolithotrophic microorganisms. A flotation concentrate, which contained pyrrhotite, arsenopyrite, pyrite, and antimonite, was used in the study. Effect of temperature on leaching of the concentrate with biogenic ferric was studied. Maximal rates of ferric and ferrous iron concentration change were observed at 80 degrees C and were 44.3 and 32.2 g L-1 h(-1) within the first 40 min of the first cycle of the leaching. The level of oxidation after two cycles of pre-leaching with biogenic ferric iron (100 min) at 80 degrees C was 643, 31.1, and 45.4% for iron, arsenic, and sulfur of all sulfide minerals, respectively. Comparison of the two-step and traditional (one-step) technologies was carried out and the flow sheet for the new process was proposed. Gold recovery from the sulfide concentrate by carbon-in-pulp cyanidation was 67.8% in the one-step process and 93.0% in the two-step process at 4 days of biooxidation, while it reached 82.4% and 94.1% in the one-step and two-step processes at 8 days of biooxidation, respectively. Introduction of the pre-leaching of the concentrate with biogenic ferric step was shown to result in decreased duration required for subsequent biooxidation, thus enhancing the economical efficiency of gold recovery. (C) 2016 Elsevier B.V. All rights reserved.