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一、冶炼原理简介直接炼铅法,在原理上与焙烧还原或沉澱熔炼不同,脱硫与还原,系同时进行,脱硫时不是自外部氧化,而是自内部予以更换。所用之脱硫剂为苏打炭酸钾或二者之混合物。在高温时(约摄氏800～900度)苏打与铅精矿或辉锑矿的混合物极易熔化,脱硫在均一之液相中,迅速进行。反应后的产物为硫化钠及氧化铅,此时如有还原剂存在氧化铅即被还原。金属与渣因此重不同,分为两层,渣流动性甚好,整个反应方程式如下:(一)铅精矿的熔炼反应:
First, the smelting principle Introduction Direct smelting lead, in principle and roasting reduction or precipitation melting different desulfurization and reduction, the Department at the same time, not from the external oxidation of desulfurization, but from the internal to be replaced. The desulfurization agent used is sodium bicarbonate or a mixture of the two. In high temperature (about 800 ~ 900 degrees Celsius) soda and lead concentrate or stibnite mixture easily melted, desulfurization in the homogeneous liquid phase, quickly. The product after the reaction is sodium sulfide and lead oxide. At this point, if there is lead oxide in the reducing agent, it is reduced. Metal and slag so different, divided into two layers, the slag mobility is very good, the entire reaction equation is as follows: (A) Lead concentrate smelting reaction: