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针对低品位矿石生物浸出液中铁含量高而有价金属含量低的特点,研究低温、低pH条件下微生物成矾除铁方法,考察了温度、pH值、菌液接种量、时间等主要因素对微生物氧化及铁矾形成的影响规律,并采用正交实验对微生物成矾除铁规律进行多因素影响分析。结果表明:在生物氧化过程中,亚铁含量为9.46 g·L-1的料液,在pH范围为1.4～2.0,温度范围为30～40℃时,36 h细菌将亚铁氧化完全,细菌氧化亚铁的效果较好;在生物成矾除铁过程中,当pH为2,温度为45℃,菌液接种量为15%,反应时间为10 d时,除铁率达到99.97%,除铁后料液含铁0.015 g·L-1;通过正交实验,确定了影响生物成矾法除铁的主次因素顺序分别为反应时间、接种量、总铁浓度,最优水平组合为:总铁浓度50 g·L-1,接种量20%,反应时间10 d,在此最优组合条件下,沉淀除铁率高达99.95%,实现了低温、低pH条件下微生物成矾除铁,为微生物浸出液的低成本、高效净化除铁提供了一条新途径。
In view of the characteristics of high content of iron and low content of valuable metals in biological leachate of low grade ore, the method of removing iron from microorganisms into alum under low temperature and low pH was studied. The effects of temperature, pH value, inoculum size, Oxidation and formation of alum. The orthogonal experiment was used to analyze the rule of microbial formation of alum through iron and multivariate analysis. The results showed that when the ferrous content was 9.46 g · L-1, the ferrous iron was completely oxidized in 36 h at pH range of 1.4-2.0 and the temperature range was 30-40 ℃. Bacteria Ferrous oxide is better. When the pH is 2, the temperature is 45 ℃, the inoculum capacity is 15% and the reaction time is 10 d, the rate of iron removal reaches 99.97% Iron and iron after the feed solution containing 0.015 g · L-1; by orthogonal experiments to determine the bio-alum method of iron removal of primary and secondary factors were reaction time, inoculum size, total iron concentration, the optimal level of combination as follows: Under the optimum conditions, the iron removal rate of the precipitate was as high as 99.95% under the conditions of total iron concentration of 50 g · L-1, inoculum size of 20% and reaction time of 10 d, Microbiological leachate for low-cost, high efficiency and purification of iron provides a new way.