三乙烯四胺(TETA)抑制磁黄铁矿氧化的机理研究  

THE PASSIVATION OF PYRRHOTITE BY TRIETHYLENETETRAMINE

作　　者：蔡美芳[1] 党志[1] NELSON Belzile 陈雨薇 

机构地区：[1]华南理工大学环境科学与工程学院,广州510640 [2]Department of Chemistry & Biochemistry Laurentian University,Sudbury,Ontario,Canada,P3E2C6

出　　处：《环境化学》2005年第5期528-532,共5页Environmental Chemistry

基　　金：Natural Sciences and Engineering Research Council of Canada;Materials and Manufacturing Ontario Centerof Excellence;广东省科技厅重大专项项目(2004A30308002)共同资助.

摘　　要：本文分别对三乙烯四胺(TETA)抑制磁黄铁矿在空气和Thiobacillus ferrooxidans细菌作用下的氧化过程进行了研究.结果表明:TETA不但能有效防止磁黄铁矿在85—90%湿度空气中的氧化,还能显著阻止Thiobacillus ferrooxidans对样品的生物氧化.与对照样品相比,在空气中氧化90d和被细菌氧化42d后,经TETA简单包膜处理样品的氧化程度分别降低了54·7%和82·07%.TETA通过在样品表面形成一层致密的膜来隔绝样品与氧气的接触,从而抑制了磁黄铁矿的空气氧化;碱性TETA还能通过提高反应体系的pH值、恶化嗜酸细菌Thiobacillus ferrooxidans的生存环境来阻止样品的生物氧化.The potential of triethylenetetramine （TETA） to inhibit pyrrhotite oxidation by air and Thiobacillus ferrooxidans was investigated. The results showed that both the chemical oxidation in moist air （85--90% RH ） and the biotic oxidation by Thiobacillus ferrooxidans of sample had been suppressed significantly after coating treatment with TETA. Compared to the control, the oxidation extent of coated sample in the air （90d） and coated sample in the presence of bacteria （42d） was reduced 54.7% and 82.07% , respectively. The formation of a strong non-porous passive film on the pyrrhotite surface and the alkaline property of this coating agent can be used to interpret the inhibition of oxidation.

关 键 词：磁黄铁矿 三乙烯四胺 氧化 THIOBACILLUS ferrooxidans 机理研究 TETA 空气氧化 生物氧化 细菌作用 

分 类 号：TD951[矿业工程—选矿]