Study on Leaching Mechanism and Safety Evaluation of Lead and Zinc Contaminated Soil

Taking the tailing pond of the Qiaokou lead-zinc mine in Hunan province as the research object, the lead-zinc-contaminated soil was leached by citric acid, and the phase characteristics of the contaminated soil before and after leaching were analyzed by SEM-EDS, combined with BCR. The continuous extraction method was used to study the occurrence of four kinds of heavy metals in contaminated soil, and then analyze the potential migration and transformation ability and migration law to evaluate the potential hazards of heavy metals to the surrounding environment, and to repair the lead and zinc tailings pond. Provide theoretical basis and technical support with governance. (paper)