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当今,近25%原锡是从含有大量杂质的贫精矿(40~5%sn)中提炼出来的。如玻利维亚、澳大利亚、民主德国以及其他许多国家都是用这类原料生产锡。苏联基本上也是用矿物成份复杂的低品位矿石和难选矿石生产锡的。苏联使用烟化炉的特点是含锡原料成份复杂,种类繁多:有冶炼厂旧废料场上的废
Today, nearly 25% of raw tin is extracted from lean concentrates (40-5% sn) containing large amounts of impurities. Such as Bolivia, Australia, Democratic Germany and many other countries are using this type of raw materials to produce tin. The Soviet Union basically produces tin from low-grade ores and refractory ores of complex mineral composition. The characteristics of the Soviet Union for the use of fuming furnaces are that the composition of the tin-containing raw materials is complex and varied: there are wastes from the old waste yard of the smelter