某混合铜矿生物浸出铜的试验研究
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摘要
研究了采用细菌氧化—硫酸浸出法从某低品位混合铜矿中浸出铜。采用摇瓶浸出、模拟半连续搅拌浸出和柱浸,考察了浸出过程中铁、氮、磷浓度对生物活性的影响。结果表明:摇瓶浸出试验中,矿浆浓度为10%、浸出6d以上条件下,铜浸出率为66.0%以上;铁、氮、磷质量浓度越高,越快被消耗;pH控制在2.0时,铁、氮、磷质量浓度分别降至100、200、5mg/L,菌液仍保持较高活性。模拟半连续浸出试验中,矿浆浓度为10%时,铜浸出率超过75%,最高达85.3%;柱浸试验中,氧化浸出23周,铜浸出率为71.0%;矿石浸出时消耗磷,应适当补加。
Leaching of copper by bacterial oxidation-sulfuric acid leaching from mixed copper ore has been studied.By flask leaching,agitation leaching and column leaching tests,the influence of iron,nitrogen,phosphorus concentration on biological activity were examined.The results showed that 66.0% copper was leached after 6 days in flask leaching test with a pulp density of 10%.The higher concentration of these nutritional elements,the faster they were consumed.When pH was low 2.0 and iron,nitrogen,phosphorus concentrations reduced to 100,200 and 5 mg/L,the bacteria remained high activity.The highest leaching rate of copper was 85.3% in agitation leaching tests.71.0% copper was leached after 23 weeks in column leaching process at the ore particle size was lower than 15 mm.Phosphorus was comsumed in leaching of ore,so it should be added.
Leaching of copper by bacterial oxidation-sulfuric acid leaching from mixed copper ore has been studied.By flask leaching,agitation leaching and column leaching tests,the influence of iron,nitrogen,phosphorus concentration on biological activity were examined.The results showed that 66.0% copper was leached after 6 days in flask leaching test with a pulp density of 10%.The higher concentration of these nutritional elements,the faster they were consumed.When pH was low 2.0 and iron,nitrogen,phosphorus concentrations reduced to 100,200 and 5 mg/L,the bacteria remained high activity.The highest leaching rate of copper was 85.3% in agitation leaching tests.71.0% copper was leached after 23 weeks in column leaching process at the ore particle size was lower than 15 mm.Phosphorus was comsumed in leaching of ore,so it should be added.
引文
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[3]张冬艳,张通.硫化铜矿的细菌浸出试验研究[J].湿法冶金,1996(2):23-26.
[4]赖绍师,覃文庆,杨聪仁,等.低品位硫化铜矿的细菌浸出[J].中国有色金属学报,2011,21(6):1473-1479
[5]《浸矿技术》编委会.浸矿技术[M].北京:原子能出版社,1994:431-441.