钢丝绳行业污泥特性及挥发回转窑处理技术研究

Study on properties and volatile revolving kiln treatment technologies of sewage sludges from steel wire rope industry

富含重金属污泥的处置和回收利用至今常有技术上的难点,更难以实现工业化的回收利用。分析研究了南通地区钢丝绳生产废水处理过程中所产生污泥的组分和特性,并与常见几类污泥作了比较。结果表明,具有高灰分和低热值的这种污泥的燃烧特性和电镀污泥相似,其主要组分Pb、Zn和Fe的含量分别为0.42%～0.58%、1.11%～5.33%和20.4%～31.1%,与生产氧化锌所用钢厂炉渣原料十分接近。提出以挥发回转窑工艺作为这种污泥的处置技术,并进行了工业化实验。实验结果表明,这一工艺应用于集中处置该地区钢丝绳生产企业的污泥、实现重金属回收是可行的。当污泥与钢厂炉渣掺比为18%时,对氧化锌产品质量并无影响。窑渣中的Pb和Zn含量很低,无害化程度高。本研究结果可为富含重金属污泥的安全处置和回收重金属提供新途径。

Disposal and reuse of the sludge containing heavy metals usually meet technical difficulties up to now,much more in industrialized recovery.The components and characteristics of the sludge produced in the effluent treatment of steel wire rope production in Nantong City were investigated and compared with those of the common types of sludge containing heavy metals in this paper.The results showed that the combustion characteristics of this sludge with high ash content and low heat output was similar to that of electroplating sludge.The main chemical components were Pb,Zn and Fe,and their contents were 0.42%~0.58%,1.11%~5.33% and 20.4%~31.1%,respectively,which were very close to those of steel plant slag used as raw material in zinc oxide production.The process of volatile revolving kiln was proposed as the disposal technology of this sludge,and the industrialized test was conducted.The results indicated that the process employed in concentrated disposal of all the sludge in the region was feasible for the recovery of heavy metals from this sludge.By using this process at the rate of 18%,this sludge mixed with steel plant slag,there was no effects on the quality of product,ZnO.The contents of Pb and Zn in the kiln slag were very low so that high harmless degree was acquired.The results of this study would provide a new way for the safe disposal and reuse of sludge containing heavy metals.