Study on reclaiming spent pot lining of aluminium electrolysis cells by alkaline leaching and acid leaching
In this paper,the process of leaching the spent pot lining (SPL) by alkaline and acid were described.Firstly,in the NaOH solution of a concentration of 60 g/L,at 100 ? ,the SPL were leached lasting 1-3 h. The purity of carbon from NaOH leaching is 72.7%.Secondly,further leaching in the HCl solution of a concentration of 5.84 wt.% ,at 100 ?,under the stirring conditions were car ried out,and the purity of carbon powder increased to 97.2%. Then,by using the acid leaching filtrate to adjust the alkaline leaching fil trate to a appropriate pH value of 9,the solid Na3AlF6 deposit from the solution at room temperature. After separating the solid Na3AlF6,the suurated solution of bleaching powder was used to deposit CaF2 by the reacting between F-and Ca2+. The process of treating sPL of aluminium electrolysis cells introduced in this paper could eliminate the solid waste materials and reclaim the second valuable resources.
spent pot lining alkaline leaching solid waste materials aluminum electrolysis
SHI Zhongning LI Wei REN Bijun WANG Zhaowen GAO Bingliang
School of Materials and metallurgy,Northeastern University,Shenyang 110004,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
728-731
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）