磁选强化淋洗技术去除土壤中的钒OA

Taking the vanadium-contaminated soil from a decommissioned iron and steel plant as the research object,a novel remediation technology for vanadium-contaminated soil was developed,namely,magnetic separation enhanced soil leaching remediation technology.The removal mechanism of heavy metal vanadium was investigated from the aspects of magnetic adsorption strength,moisture content,and speciation of heavy metals.The experimental results show that the vanadium in the soil is mainly enriched in the soil with particle size＜2.00 mm.The vanadium removal rate of single leaching remediation technology for this soil is less than 20%.The application of magnetic separation prior to leaching remediation technology can enhance the vanadium removal efficiency,increasing the vanadium removal rate of high-concentration contaminated soil from 20.2%to 88.4%.Furthermore,the proportion of Fe-Mn oxide-bound vanadium in soil can be reduced from 42.6%to 24.6%.It indicates that the technology effectively decreases the proportion of stable heavy metals in soil that are difficult to leach and cuts down the remediation cost by more than 40%.