砷锑烟尘砷汞赋存形态与分布特征研究

Study on Existence Speciation and Distribution Characteristics of Arsenic and Mercury in Smelting Dust

以典型冶炼企业的砷锑烟尘为研究对象,对砷、汞的赋存形态和分布特性进行研究。结果表明,砷锑烟尘中的重金属污染物主要包括砷、汞、镉、锑等,其中回转窑工段以砷尘为主。回转窑烟尘的砷含量高达48.00%、汞含量为0.005%,电炉烟尘的砷含量仅1.15%、汞含量为0.0064%。烟尘的分布规律表明,回转窑烟尘为粗颗粒烟尘,粒径大于10 μm的烟尘总量占34.83%,电炉烟尘主要集中分布小粒径范围内,1 μm以下的颗粒总量41.72%。砷锑烟尘中砷形态表以As(III)为主,汞含量较低,主要以单质汞和氧化汞的形态存在。

The existence speciation and distribution characteristics of arsenic and mercury in typical tin smelting dust were studied. The results showed that the heavy metal pollutants in the dust dis-charged by As and Sb smelting enterprises mainly included arsenic, mercury, cadmium and tin, among which arsenic dust was the main one in rotary kiln. The arsenic content of rotary kiln dust was as high as 48.00%, mercury content was 0.005%, furnace dust arsenic content was only 1.15%, mercury content was 0.0064%. The distribution of smoke and dust in rotary kiln showed that the dust in rotary kiln was coarse particle dust, the total amount of smoke dust larger than 10 μm ac-counts for 34.83%. And the smoke dust in electric furnace was mainly distributed in the range of small particle size;the total amount of particles less than 1 μm was 41.72%. The arsenic speciation in tin smelting dust was mainly As(III), and the mercury content was low, mainly in the form of elemental mercury and mercuric oxide.