Using CaO to stabilize arsenic sulfide slag by moderate temperature calcination |
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| Authors: | Qiong Lu Hongxia Xiao Ying Du Dongyun Du |
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| Institution: | 1.Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan,People’s Republic of China |
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| Abstract: | This study was conducted to investigate the stabilization of arsenic sulfide slag (ASS) with CaO calcinations at moderate temperature, including the effects of calcination temperature and different As/Ca molar ratios on arsenic leaching concentration. In the process of calcination for arsenic-contained waste, 90.95–97.23% of arsenic was reserved and the original waste was transformed into a dense and liquation state, which could physically wrap arsenic and reduce its leaching concentration. Meanwhile, the decrease in the As/Ca molar ratios was conducive to the formation of Ca5(AsO4)3(OH). When As/Ca molar ratio was less than 1:8, there was excessive CaO and the ASS samples stopped reacting with CaO. The results showed that the leaching concentration of arsenic was 4.08 mg/L when As/Ca molar ratio was 1:8 and the ASS sample was calcined for 2 h at temperature of 550 °C. In the process, arsenic’s chemical reaction and physical wrapping resulted in a remarkable decrease in its leaching concentration. |
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