CAJ | 학술논문

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Na3AlF6和Al2O3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HC1浸出得到炭粉,可溶性化合物CaF2和NaAl11O17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℃下沉积2h,其析出率达到95.6％,所得冰晶石纯度为96.4％.
채용량보침출법대려전해조폐구음겁탄괴진행처리,이분리출빙정석병제순탄분.연구불동온도、침출시간화액고비대침출솔적영향.결과표명,재NaOH침출계단,가용성화합물Na3AlF6화Al2O3용해우NaOH용액중,침출솔체도65.0％,소득탄분순도위72.7％；제이보채용HC1침출득도탄분,가용성화합물CaF2화NaAl11O17용해도염산용액중,침출솔체도96.2％,탄분순도체도96.4％.장상술감침화산침득도적침출액진행혼합이석출빙정석,재pH=9、온도위70℃하침적2h,기석출솔체도95.6％,소득빙정석순도위96.4％.
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 HC1 leaching,the recovery of soluble compounds of CaF2 and NaAl11O17 dissolving into the HC1 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 ℃ for 2 h.The cryolite precipitating rate is 95.6％,and the purity of Na3AlF6 obtained is 96.4％.