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RECOVERY OF CHROMIUM FROM TANNERY SLUDGE BY ACID LEACHING

ZHANG Xi;HE Shan-ying;WANG Wen-chu;YANG Chunping;LV Li;College of Environmental Science and Engineering, Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University;Environmental Protection Agency of Taizhou;  
Leaching studies of tannery sludge were carried out in sulfuric acid media aiming to recover the maximum leaching yield of chromium. The effect of various factors(solid-liquid ratio, the concentration of acid, leaching time, temperature and stirring rate) was studied. The results indicate that the optimum solid-liquid ratio is 10g/L, the concentration of sulfuric acid is 0.5mol/L, the leaching temperature is 50℃, and the leaching time is 1.5h. The stirring rate affected rarely on leaching yield of chromium. After two times of leaching, the leaching yield of chromium had become 90.95%. Therefore, the application of sulfuric acid leaching to recover chromium is available.
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