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高锡钨鑛的磁选副產品錫鑛,含有雜質很多,如鉛、鉍、铁、钨、硫、砷、銻及矽等,幾乎凡与钨鑛共生而又不感磁性的矿物,都聚積在錫石中,因此,錫鑛的品位很低。这些雜質,对锡石都是有害的。但可以依據它們与錫石有不同的物理、化学性質,採用各种选矿法,使它們与錫石分離。如铁、钨經过磁选;硫、砷、銻進行氧化或氧化还原焙燒;矽及其他脈石利用重力洗选等法使上述大部分雜質与錫石分離。但由於鉛鑛、鉍鑛与錫石三者之間的比重相差有限,又均無磁性,故不能藉重力或磁力选鑛達到与錫石分離的目的,普通進行的氧化焙燒,也难以使鉛、鉍揮發,此類錫鑛含鉛、鉍非常丰富。一般兩者平均含量在2.5～3.0％,甚至竟高達5-6％,如不先除去鉛、鉍,精选錫石,則在冶煉中,它們將与錫石一道,被还原为金屬進入錫液中,使錫品質不純,难以適应工業需要。
High-tin tungsten magnetic separation by-product tin, containing many impurities, such as lead, bismuth, iron, tungsten, sulfur, arsenic, antimony and silicon, almost all with the symbiosis of tungsten minerals are not magnetic, are accumulated in tin Stone, therefore, tin grade is very low. These impurities are harmful to cassiterites. However, depending on their different physical and chemical properties from cassiterite, various mineral processing methods can be used to separate them from cassiterite. Such as iron, tungsten after magnetic separation; sulfur, arsenic, antimony oxidation or redox roasting; silicon and other gangue gravity scrubbing method so that most of the above impurities and cassiterite separation. However, since the proportions of lead, bismuth and cassiterite are limited to a limited extent and are all non-magnetic, it can not be separated by gravity or magnetic force from the cassiterite, and ordinary oxidation roasting can hardly make lead , Bismuth volatilization, such tin lead, bismuth is very rich. The average content of the two generally 2.5 to 3.0%, or even as high as 5-6%, if not first remove lead, bismuth, cassiterite, then smelting, they will be together with cassiterite, was reduced to metal into the tin Liquid, tin quality impure, difficult to adapt to industrial needs.