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在pH值小于1～3.5条件下,能够将亚铁,元素硫和硫化物氧化的中等耐热细菌(40℃～55℃)和极耐热细菌(>55℃),为预处理难浸贵金属矿石和精矿提供了新的可能性.促使人们应用耐热细菌的因素是:迅速的氧化动力学,冷却要求减少;耐含盐条件和可能致使吸附金的碳失去活性以及潜在地利用被氧化的化合物等.中等耐热细菌的大部分操作条件类似于产硫酸杆菌铁氧化剂的操作条件.事实上,这些生物体在许多环境中共存.极耐热细菌严格地要求温度超过55℃,应用它们需要进一步研究和证实其技术和经济上的可行性.
Medium-temperature resistant bacteria (40 ° C-55 ° C) and very heat-resistant bacteria (> 55 ° C) capable of oxidizing ferrous, elemental sulfur and sulphide at pH values of less than 1 to 3.5 are essential pretreatments for refractory precious metals Ores and concentrates provide new possibilities to promote the use of thermophilic bacteria by factors such as: rapid oxidation kinetics, reduced cooling requirements, salt-tolerant conditions and loss of activity that may cause adsorption of gold carbon and potential utilization of oxidized Etc. Most of the medium heat-resistant bacteria have operating conditions similar to the operating conditions of the sulfate-producing ferric oxide, in fact, these organisms co-exist in many environments.Highly thermophilic bacteria are strictly required to have temperatures in excess of 55 ° C, applying them There is a need to further study and confirm its technical and economic feasibility.