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一、回转窑操作实际在用回转窑处理含铅高的滤过渣时,铅在残渣中主要是不挥发的硫酸盐,还原硫酸铅而得到硫化铅,另一部分与硫化物生成合金。由于硫酸铅及硫化铅的反皮,形成SO_2,及金属铅,但它的蒸馏温度很高,不能显著挥发故而进入到冰铜中去。硫化铅在600℃时开始挥发,温度越高进行得越剧烈,当它与其他的硫化物做成合金时,挥发就减少了。氧化铅与别的金属相互反应时,生成金属铅进入到窑渣中去。铅混合到冰铜中以后,它在料层下部无法氧化,因此也就不能蒸馏。氧化铅在750℃或1000℃以上时开始挥发,锌及铅的化合物热组成如下表所示:
First, the operation of the rotary kiln Actually used in the rotary kiln leaching of high leaching residue, the lead in the residue is mainly non-volatile sulfate, lead sulfate reduction to be lead sulfide, and the other part of the sulfide and the formation of alloys. As the lead sulfate and lead sulfide anti-skin, the formation of SO_2, and metallic lead, but its distillation temperature is high, can not be significantly volatile and therefore into the matte. Lead sulfide begins to volatilize at 600 ° C. The harder the temperature is, the more violent it is. When it is alloyed with other sulfides, the volatilization is reduced. Lead oxide and other metals react with each other to generate metallic lead into the kiln slag. After the lead is mixed with matte, it can not be oxidized in the lower part of the bed and therefore can not be distilled. Lead oxide begins to volatilize at 750 ° C or above, and the thermal composition of zinc and lead compounds is shown in the following table: