铬铁渣重金属浸出特性及环境风险研究

Leaching Characteristics and Utilization Risk of Heavy Metal Ferrochromium Slag

  • 摘要: 含有重金属的铬铁渣露天堆存、填埋处置和资源化利用过程均可能存在环境风险。以重庆某铬铁合金冶炼厂铬铁渣样品为例,采用国家标准浸出方法进行浸出试验研究。结果表明:水淬渣、干渣和陈渣中V、Cr、Mn、Ni、Zn、As、Se、Ba等重金属的浸出浓度均低于GB 5085.3—2007《危险废物鉴别标准 浸出毒性鉴别》的浓度限值,其中Cr的浸出浓度分别为0.033 8、0.012 2和0.027 8 mg/L。铬铁渣属于一般工业固体废物,可按照一般工业固体废物进行填埋处置,其资源化产品的环境风险也应引起重视。 

     

    Abstract: Open storage, landfill disposal and resource utilization of ferrochromium slag may have environmental risks because of containing heavy metals. The ferrochromium slag sample from a ferrochrome smelter in Chongqing city was taken as an example and the leaching experiment performed adopting national standard leaching methods. The results showed that the leaching concentrations of heavy metals such as V, Cr, Mn, Ni, Zn, As, Se of the water quenched slag, dry slag and old slag were much lower than the hazardous waste identification standards, among which the leaching concentration of Cr was 0.033 8, 0.012 2 and 0.027 8 mg/L, respectively for the three slags. Therefore, ferrochromium slag should belong to general industrial solid wastes, which means that ferrochromium slag can be disposed of in a landfill as general industrial solid waste and the environmental risk of the recycled products from it should be paid more attention to.

     

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