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Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching 被引量:26
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作者 SHI Zhong-ning LI Wei +3 位作者 HU Xian-wei ren bi-jun GAO Bing-liang WANG Zhao-wen 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期222-227,共6页
A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alka... A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alkaline and acidic leaching were investigated. The results show that the recovery of soluble compounds of Na3AlF6 and Al2O3 dissolving into the solution during the NaOH leaching is 65.0%,and the purity of carbon reaches 72.7%. During the next step of HCl leaching, the recovery of soluble compounds of CaF2 and NaAl11O17 dissolving into the HCl solution is 96.2%, and the carbon purity increases to 96.4%. By mixing the acidic leaching solution and the alkaline leaching solution, the cryolite precipitates under a suitable conditions of pH value 9 at 70 °C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na3AlF6 obtained is 96.4%. 展开更多
关键词 spent pot lining RECOVERY chemical leaching aluminium electrolysis
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