Leaching of zinc by organic acid from waste of lead and zinc plant in Zanjan

In this research one of the methods for extract zinc was studied. To recovery of zinc and convert this material to suitable mulch, leaching of zinc from a sample soil of lead and zinc plant in Zanjan by organic acid was studied .This soil containing ۱۱ % zinc that determine with XRF analysis, and the leached was Tartaric acid, because it is appropriate environment . Zinc and acid constitute a stable complex, and then zinc is recovered.The research was including a leaching study to determine the optimal condition of leaching of zinc. Zinc concentration measured in leached soil in various conditions. Optimal conditions were determined by investigating the effect of [۲] PH, time, temperature, solid /liquid ratio, different solver, and concentration of acid.The effect of leaching parameters on the zinc recovery was studied. About ۵۰% zinc was recovered after leaching at ۲۵̊ C, for ۳۰ min, in ۲۰ m mol Tartaric acid and with a pulp density of ۵% solid.