Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching
化学法浸出废旧铝电解槽内衬回收冰晶石和碳粉
查看参考文献22篇
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文摘
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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 Na_3AlF_6 and Al_2O_3 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 CaF_2 and NaAl_(11)O_(17) 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 Na_3AlF_6 obtained is 96.4%. |
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其他语种文摘
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采用两步浸出法对铝电解槽废旧阴极炭块进行处理,以分离出冰晶石并提纯炭粉。研究不同温度、浸出时间和液固比对浸出率的影响。结果表明,在NaOH浸出阶段,可溶性化合物Na_3AlF_6和Al_2O_3溶解于NaOH溶液中,浸出率达到65.0%,所得炭粉纯度为72.7%;第二步采用HCl浸出得到炭粉,可溶性化合物CaF_2和NaAl_(11)O_(17)溶解到盐酸溶液中,浸出率达到96.2%,炭粉纯度达到96.4%。将上述碱浸和酸浸得到的浸出液进行混合以析出冰晶石,在pH=9、温度为70°C下沉积2h,其析出率达到95.6%,所得冰晶石纯度为96.4%。 |
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来源
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Transactions of Nonferrous Metals Society of China
,2012,22(1):222-227 【核心库】
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DOI
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10.1016/s1003-6326(11)61164-3
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关键词
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spent pot lining
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recovery
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chemical leaching
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aluminium electrolysis
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地址
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School of Materials and Metallurgy, Northeastern University, Shenyang, 110004
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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行业污染、废物处理与综合利用 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:4453973
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