科研之友
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摘要
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 Ca-5(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 degrees C. In the process, arsenic's chemical reaction and physical wrapping resulted in a remarkable decrease in its leaching concentration.
- 出版日期2017-3
- 单位中南民族大学
