Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (4): 267-276.DOI: 10.11890/1006-7191-104-267

• 研究论文 • 上一篇    下一篇

不锈钢炼钢厂粉尘中重金属的浸出能力和形态

马国军,范巍,薛正良,王炜,唐辉   

  1. 武汉科技大学
  • 收稿日期:2009-12-28 修回日期:2010-04-20 出版日期:2010-08-25 发布日期:2010-08-11
  • 通讯作者: 马国军

Leachability and fractionation of heavy metals in stainless steelmaking plant dusts

Guojun MA, Wei FAN, Zhengliang XUE, Wei WANG, Hui TANG   

  1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
  • Received:2009-12-28 Revised:2010-04-20 Online:2010-08-25 Published:2010-08-11
  • Contact: Guojun MA

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摘要：

采用修正的HJ/T299-2007浸出法、毒物特性浸出程序（TCLP）和一种7步连续提取程序对不锈钢炼钢厂粉尘中选定的重金属元素（Cr、Cd、Pb 和Zn）的浸出能力和形态进行了研究。结果表明，由于至少有一种可浸出的重金属元素含量超过了相应的国家环保局限制标准，不锈钢炼钢厂粉尘为认定一种有害物质。在连续提取过程中，铅是最易被提取的重金属元素，而铬、镉和锌主要存在于尖晶石相和硅酸盐形态。粉尘中重金属可移动相存在于水溶态、可交换态以及碳酸盐和氢氧化物结合态，其含量分别为0.08-1.2 % Cr、7.6-31.8 % Cd、34.1% Pb和0.052-0.4 % Zn。

关键词: 粉尘, 重金属, 化学形态, 不锈钢, 浸出能力

Abstract:

The leachability and fractionation of the selected heavy metals (Cr, Cd, Pb and Zn) in the stainless steelmaking plant dusts were studied by the modified HJ/T299-2007 method, the modified TCLP test and a seven-step sequential extraction procedure. The results show that the stainless steelmaking plant dusts are considered as hazardous materials since at least one of the leachable heavy metals exceeds the corresponding limit levels of State Environmental Protection Administration of China. Pb is the most extractable heavy metals by the sequential extraction procedure, while Cr, Cd and Zn mainly presents in the residual fraction bound to spinel phase and silicates. The mobile heavy metals in the dusts, which present as the species of water soluble, exchangeable species and the species bounded to carbonates and hydroxides, can be estimated as 0.08-1.2% of Cr, 7.6%-31.8% of Cd, 34.1% of Pb, 0.052-0.4% of Zn, respectively.

Key words: Dust, Heavy metals, Chemical speciation, Stainless steel, Leachability