Abstract: Taking the tailings sand of Lutang lead and zinc mine in Guangxi as the research object, the activation and migration law of Cu, Cd,  Zn,  Pb, As  and other elements in tailings sand under different oxidation and reduction conditions was studied by leaching experiments. The results showed that the tailings treated with high concentration oxidation and high concentration reduction conditions showed the acidic environment with pH <7, and showed weak acidity to weak alkaline environment with pH>7 under the treatment of low concentration oxidation environmental conditions. The activation and migration of Cd is obviously affected by pH, that is, high concentration reduction, high oxidation, and acidic conditions can promote the migration of Cu and Cd; While reducing conditions can effectively promote the release and migration of Pb and As. The surface resistance of lead and zinc ore is small in the pre-filtration experiment,  and the migration ability of heavy metal elements in the initial stage is strengthened. The adsorption energy level of the initial tailings for heavy metal elements is changed by the change of ambient acidity and alkalinity. Later in the leaching period, the surface resistance of the mineral particle is increased due to the redox reaction, the dissolved amount of heavy metal elements is decreased, and the migration ability is inhibited.

Key words: redox, migration law, heavy metal elements, Lead and zinc mine, mine tailings