熔炼锡精矿时,对含砷大于1％的锡精矿须在炼前尽可能把它除去。我厂是利用沸腾炉焙烧脱砷,约有65—75％的砷进入烟尘,烟尘含砷较高,一般达30—40％,其它杂质含量亦高。多年来我厂一直采用蒸馏炉挥发法生产白砷,杂质难于分离,致使产品品位难以提高(As_2O_3一般在90—95％),其 When smelting tin concentrate, the tin concentrate containing 1% or more of arsenic should be removed as much as possible before refining. I plant is the use of boiling furnace arsenic removal, about 65-75% of the arsenic into the dust, dust containing arsenic higher, usually up to 30-40%, other impurities are also high. For many years, our factory has been using distillation furnace volatilization production of white arsenic, impurities difficult to separate, resulting in product quality is difficult to improve (As_2O_3 generally 90-95%), its