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粗锡精炼,用凝析法除砷、铁,产出“炭渣”。色深灰绿,粉末状,夹有木屑炭灰。化学成分(％)为As12～14、FE0.7、Pb11.1、Sb0.09及Sn66.45。工厂里曾用焙烧法处理炭渣,以图烧去砷而回收锡。但当温度升到700℃以上,炭渣开始部分熔化,妨碍氧化脱砷。在没有更适宜的办法时,炭渣送到反射炉熔炼成粗锡。砷又大部份回到下一批炭渣中,造成砷在炼锡过程中往复循环。
Crude tin refining, with condensate method of arsenic, iron, output “cinder.” Dark gray and green, powder, charcoal clip ash. Chemical composition (%) As12 ~ 14, FE0.7, Pb11.1, Sb0.09 and Sn66.45. Coking process has been used in the factory to treat charcoal residue, in order to burn arsenic to recover tin. However, when the temperature rises above 700 ℃, the carbon residue begins to partially melt, which hinders oxidation and arsenic removal. In the absence of a more suitable solution, the cinders are sent to a reverberatory furnace and melted into crude tin. Most of the arsenic returns to the next batch of cinders, causing arsenic to cycle back and forth during the smelting of tin.