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我场部分地区收购的粗锡,是由民营用土法冶炼出来的,杂质成份很多,共组成如下表所示:这种粗锡,过去我们曾用鼓风炉进行翻炼,虽经翻炉二次亦不能达到最低的质量标准原因是:鼓风炉温度在1100℃以上,几乎所有的杂质和锡都成熔融状态,又无药剂以清除杂质。我们经验的提纯工作,分二步进行,提炼工具用铁板溜槽,坡度约4～5%,以木炭火做高温床,位于槽上端。一、第一步提纯,将粗锡块置入溜槽上部的炭火中,使温度达600℃左右,这时,熔点在600℃以上
The crude tin purchased in some areas of our factory is smelted by privately owned soil method with many impurity components. The composition is as the following table: This crude tin, which we used to use the blast furnace to conduct the pasting, The reason why the lowest quality standards can not be achieved is that the blast furnace temperature is above 1100 ° C, almost all the impurities and tin are in a molten state, and there is no agent to remove the impurities. Our experience in the purification work, divided into two steps, refining tools with iron chute, gradient of about 4 ~ 5%, with hot charcoal fire bed, located in the upper groove. First, the first step purification, the crude tin into the chute upper charcoal, so that the temperature of about 600 ℃, then, the melting point above 600 ℃