Sustainable Mining and Metallurgy

Taking the waste rock before and 2 years after the ecological restoration of a copper mine stockyard as the object, the acid production potential was evaluated by static method, and the acid waste water generation and metal ion release were studied in combination with the dynamic humidity box simulation weathering test. The static test results show that the waste rocks before and after ecological restoration have potential acid production capacity, and the stacking process has certain acidification risk to the environment. The results of dynamic humidity box test showed that the waste rocks before remediation continuously discharged acidic wastewater and heavy metals, and the concentration of Cu, Zn exceeded the standard; the time of acid wastewater discharge and the release of Fe, Cu, Zn and other metal ions from the restored waste rocks were delayed by 40 weeks compared with the waste rocks before remediation, which indicated that the ecological remediation using neutralization residues had a certain inhibition effect on the acid wastewater generation and the release of metal pollution factors.