Restoration Technique for Heavy Metal Polluted Slag Slope in Abandoned Lead-Zinc Mine

In March 2017, investigations were carried out on pollution of water, soil and plant on slag slope in abandoned lead-zink mine in Qingyuan, Zhejiang province. Analysis was made on limits for restoration and greening. From October 2018, greening had been executed by isolation plantation, organic improvement and coverage of substrate with plant seeds. In October 2019, the project was ended. The results showed that plants grew normally. In April 2020, determination on Pb, Zn and Cd content in the water body underneath the slope decreased from 0.300 05 to 0.005 0 mg/L, 69.585 0 to 0.700 0 mg/L and 1.959 1 to 0.001 7 mg/L respectively.