关键词: 嗜酸氧化亚铁硫杆菌, 黄药类捕收剂, 毒害机理, 吸附作用

Abstract: The effects and toxicity mechanism of xanthate collectors (ethyl xanthate, isopropyl xanthate, butyl xanthate, isoamyl xanthate) on the activity of bacteria (i.e., Acidithiobacillus ferrooxidans, LD-1) were investigated. It is shown that alcohols and CS2 produced by the reaction of xanthate collectors and sulfuric acid are toxic to LD-1 bacteria. This can decrease the oxidation activity of LD-1 bacteria. With increasing of xanthate molecular weight, the absorption properties and permeability of alcohols on the surface of bacteria become increasingly stronger. So the inhibition effect of alcohols on LD-1 bacteria becomes more and more strong. With increasing of carbon chain length, the amount of CS2 produced by the reaction of xanthate and sulfuric acid decreases gradually at the same dosage of xanthate. And so the inhibition effect of CS2 on LD-1 bacteria becomes more and more weak. Therefore, xanthate collectors with different length of carbon chain have different inhibition effects on LD-1 bacteria.

Key words: Acidthiobacillus ferrooxidans, xanthate collectors, toxicity mechanism, adsorption