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生物氧化可作为含金硫化矿的预处理方法、其药剂费用低,对环境保护也很有意义.然而,该法的动力学缓慢,反应时间长(几天甚至几周),因此操作费用很高.如果通过间接接触的方法进行生物氧化,并且将化学和生物两种作用有效地分成两个作业,则其反应动力学将会得到改善,两个作业分别为:(1)用三价铁进行硫化物的化学反应;(2)所产生的二价铁的生物氧化(化学和生物作用).本文作为一种间接生物氧化的例子,采用将化学和生物两种作用分离的方法研究了砷黄铁矿精矿的硫酸铁浸出工艺.研究结果令人满意.通过用银作催化剂和采用适宜的高温作业,提高了化学氧化阶段(硫酸铁浸出)的动力学.已经证实,二价铁生物氧化(生物阶段)动力学的驱动作用增强了化学氧化阶段的反应,从而导致整个工艺过程的改善.
Biooxidation can be used as a pretreatment method for gold-bearing sulphide ores with low cost of pharmacy and great environmental protection, however, its kinetics are slow and reaction time is long (several days or even weeks), so the operation cost is very high High If the biological oxidation by the indirect contact method, and the chemical and biological activities are effectively divided into two operations, the reaction kinetics will be improved, the two operations were: (1) with ferric (2) Biooxidation of ferrous iron produced (chemical and biological effects). As an example of indirect bio-oxidation, the separation of arsenic from chemical and biological arsenic Ferric sulfate leaching process for pyrite concentrate with satisfactory results The kinetics of the chemical oxidation stage (ferric sulphate leaching) have been improved by using silver as a catalyst and using suitable high temperature operation.It has been demonstrated that bivalent iron organisms The driving effect of oxidation (biological stage) kinetics enhances the reaction in the chemical oxidation stage, resulting in an improvement of the overall process.