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Response surface optimization of ettringite precipitation method to remove sulfate from old kiln water in a closed pit coal mine
In order to reduce the harm of old kiln water in closed pit coalmine, an optimization study on the removal conditions of high concentration SO42-, Fe3+ and Mn2+ in the old kiln water by sedimentation method of ettringite〔Ca6[Al(OH)6]2(SO4)3·26H2O〕 was carried out. The effects of initial pH, n(Al3+)/n(SO42-), n(Ca2+)/n(SO42-) on SO42- removal and the residues of Ca2+ and Al3+ were systematically analyzed by single factor test. The results showed that, under the conditions of initial pH=11.5, n(Al3+)/n(SO42-)=0.8, n(Ca2+)/n(SO42-)=1.5, reaction time of 1 h, the SO42- removal rate reached the highest of 81.85%, the romoval rates of Fe3+ and Mn2+ remained at a high level, and the residual concentrations of Ca2+ and Al3+ were 18.05 mg/L and 29.96 mg/L, respectively. The Box-Behnken response surface method was used to optimize the process conditions. The model showed that the optimal process conditions were initial pH=11.557, n(Al3+)/n(SO42-)=0.858 and n(Ca2+)/n(SO42-)=1.705. Under these conditions, the actual removal rate of SO42- was 85.470%. Meanwhile,the average residual concentration of Al3+ and Ca2+ was 2.32 mg/L and 29.64 mg/L, respectively.
Response surface optimization of ettringite precipitation method to remove sulfate from old kiln water in a closed pit coal mine
In order to reduce the harm of old kiln water in closed pit coalmine, an optimization study on the removal conditions of high concentration SO42-, Fe3+ and Mn2+ in the old kiln water by sedimentation method of ettringite〔Ca6[Al(OH)6]2(SO4)3·26H2O〕 was carried out. The effects of initial pH, n(Al3+)/n(SO42-), n(Ca2+)/n(SO42-) on SO42- removal and the residues of Ca2+ and Al3+ were systematically analyzed by single factor test. The results showed that, under the conditions of initial pH=11.5, n(Al3+)/n(SO42-)=0.8, n(Ca2+)/n(SO42-)=1.5, reaction time of 1 h, the SO42- removal rate reached the highest of 81.85%, the romoval rates of Fe3+ and Mn2+ remained at a high level, and the residual concentrations of Ca2+ and Al3+ were 18.05 mg/L and 29.96 mg/L, respectively. The Box-Behnken response surface method was used to optimize the process conditions. The model showed that the optimal process conditions were initial pH=11.557, n(Al3+)/n(SO42-)=0.858 and n(Ca2+)/n(SO42-)=1.705. Under these conditions, the actual removal rate of SO42- was 85.470%. Meanwhile,the average residual concentration of Al3+ and Ca2+ was 2.32 mg/L and 29.64 mg/L, respectively.
Response surface optimization of ettringite precipitation method to remove sulfate from old kiln water in a closed pit coal mine
LI Qing (author) / LI Shuoyang (author) / HU Ziru (author) / MIAO Zhijia (author) / DAI Fenggang (author) / YAN Qiaozhi (author) / YU Qiqi (author) / ZHAO Zhirui (author)
2025
Article (Journal)
Electronic Resource
Unknown
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