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环境化学  2015 

含铊硫铁矿生产硫酸过程中铊的排放特性

Keywords: ,硫铁矿,焙烧实验,影响因素,排放特性

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Abstract:

通过焙烧实验探讨了含铊硫铁矿生产硫酸过程中铊的排放特性.结果表明,硫铁矿焙烧过程中,铊排放与焙烧温度、停留时间、焙烧气氛、硫铁矿的粒度等因素有关.不同的温度条件下,铊排放率不同,这主要是与矿石中铊的赋存形态有关;实验条件下,550℃-950℃是Tl排放的主要阶段,Tl排放量约占硫铁矿中总Tl的33.9%.Tl的排放率随停留时间的增加呈现增大的趋势,Tl在10min的停留时间内急剧排放,此阶段为Tl排放的主要阶段,其排放率达到30.6%.焙烧气氛对铊的排放存在促进或阻滞的影响,氧气流量小于100mL·min-1时,铊排放率随氧气流量的增加而增加,而氧气流量高于100mL·min-1时,铊排放率随氧气流量的增加而减小.此外,硫铁矿的粒度对Tl的排放也存在一定的影响,随着硫铁矿粒度的增加,在相同的时间内Tl排放率有降低的趋势.

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