Acid Production Potential of Lead-zinc Waste Rocks and Analysis of Heavy Metal Eluviating at Simulated Strong Acid Rain Environment

This is an article in the field of ecological restoration of mines. A large amount of waste rock is inevitably produced in the process of mine development, and the release of heavy metal elements in the waste rock at the effect of weathering and eluviating will pose a threat to the water-and-soil quality around the mining area. In order to study the eluviating rule of heavy metal elements in lead-zinc waste rocks, the chemical composition and acid production potential of the waste rocks were analyzed. The leaching rates of heavy metal elements in the waste rocks and their mineral composition before and after eluviating were analyzed at simulated strong acid rain environment. The results showed that heavy metals elements of Cu, Pb, Zn, Cd, A sin the waste rocks had no independent minerals and were dispersed. The waste rocks had an ability of high acid neutralization, whose NAG was 0, with no acid production potential. In the eluviating tests at simulated strong acid rain environment, the pH values of leached s