Extraction and kinetic analysis of Pb and Sr from the leaching residue of zinc oxide ore
来源期刊：International Journal of Minerals Metallurgy and Materials2021年第2期
论文作者：Xiao-yi Shen Yuan-yong Liang Hong-mei Shao Yi Sun Yan Liu Yu-chun Zhai
文章页码：201 - 209
摘 要：NH4HCO3 conversion followed by HCl leaching was performed and proven to be effective in extracting Pb and Sr from zinc extracted residual. The mechanism and operating conditions of NH4HCO3 conversion, including molar ratio of NH4HCO3 to zinc extracted residual,NH4HCO3 concentration, conversion temperature, conversion time, and stirring velocity, were discussed, and operating conditions were optimized by the orthogonal test. Experimental results indicate that NH4HCO3 conversion at temperatures ranging from 25 to 85°C follows the shrinking unreacted core model and is controlled by inner diffusion through the product layer. The extraction ratios of Pb and Sr under optimized conditions reached 85.15% and 87.08%, respectively. Moreover, the apparent activation energies of Pb and Sr were 13.85 and13.67 k J·mol-1, respectively.
Xiao-yi Shen1，Yuan-yong Liang1，Hong-mei Shao2，Yi Sun1，Yan Liu1，Yu-chun Zhai1
1. Key Laboratory for Ecological Utilization of Multimetallic Mineral of Ministry of Education, School of Metallurgy, Northeastern University2. School of Environmental and Chemical Engineering, Shenyang Ligong University
摘 要：NH4HCO3 conversion followed by HCl leaching was performed and proven to be effective in extracting Pb and Sr from zinc extracted residual. The mechanism and operating conditions of NH4HCO3 conversion, including molar ratio of NH4HCO3 to zinc extracted residual,NH4HCO3 concentration, conversion temperature, conversion time, and stirring velocity, were discussed, and operating conditions were optimized by the orthogonal test. Experimental results indicate that NH4HCO3 conversion at temperatures ranging from 25 to 85°C follows the shrinking unreacted core model and is controlled by inner diffusion through the product layer. The extraction ratios of Pb and Sr under optimized conditions reached 85.15% and 87.08%, respectively. Moreover, the apparent activation energies of Pb and Sr were 13.85 and13.67 k J·mol-1, respectively.
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