Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching

IMR OpenIR

	Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching
其他题名	Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching
	Shi Zhongning; Li Wei; Hu Xianwei; Ren Bijun; Gao Bingliang; Wang Zhaowen
	2012
发表期刊	TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN	1003-6326
卷号	22 期号:1 页码:222-227
摘要	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 degrees C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na3AlF6 obtained is 96.4%.
其他摘要	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%.
关键词	spent pot lining recovery chemical leaching aluminium electrolysis
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China]
CSCD记录号	CSCD:4453973
引用统计	被引频次：14[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/146569
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 GB/T 7714	Shi Zhongning,Li Wei,Hu Xianwei,et al. Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2012,22(1):222-227.
APA	Shi Zhongning,Li Wei,Hu Xianwei,Ren Bijun,Gao Bingliang,&Wang Zhaowen.(2012).Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,22(1),222-227.
MLA	Shi Zhongning,et al."Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 22.1(2012):222-227.