title: Pretreatment of cyanided tailings by catalytic ozonation with Mn2+/O3.
abstract: The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2+ dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be: ore pulp density 2.5%, agitation speed 700 r/min, temperature 60°C, Mn2+ dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2+/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part.
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Yulong
authors: Y
authors: Li
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China. Electronic address: lidengxin@dhu.edu.cn.
authors: Dengxin
authors: D
authors: Li
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Jiebing
authors: J
authors: Li
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Jin
authors: J
authors: wang
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Asif
authors: A
authors: Hussain
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Hao
authors: H
authors: Ji
authors: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors: Yijie
authors: Y
authors: Zhai
mesh_terms: D002384:Catalysis; D003486:Cyanides / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D004787:Environmental Pollution / Q000517:prevention & control*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006046:Gold / Q000737:chemistry; D007220:Industrial Waste / Q000517:prevention & control*; D007501:Iron / Q000737:chemistry; D008345:Manganese / Q000737:chemistry*; D008906:Mining; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D059027:Recycling; D013464:Sulfuric Acids / Q000737:chemistry
chemical_list: D003486:Cyanides; D004785:Environmental Pollutants; D007220:Industrial Waste; D013464:Sulfuric Acids; D008345:Manganese; D010126:Ozone; D006046:Gold; D007501:Iron; C033158:sulfuric acid
keywords: Catalytic ozonation; Cyanided tailings; Mn(2+)/O(3); Pretreatment