Overview Lead and Zinc RecoveryA soil washing and leaching process was tested for removing lead from soils. A soilwashing circuit, including size and gravity separations, was employed to remove the coarse metallic lead particles, while the leaching was applied to remove fine metallic lead particles and other lead species. The soilwashing tests proved that the metallic lead particles larger than 0.15 mm (100 mesh) could be effectively removed. The sodiumchloride-based leaching solution with ferric chloride or sodium hypochlorite as oxidants was adopted in the leaching. The leaching experimental results indicated that under the pH of 2 and Eh of 1,300 mV, the metallic lead particles smaller than 0.15 mm and other lead species can be dissolved in the leaching solution within 60 minutes.
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