文献类型：期刊文献

英文题名：A Systematic Investigation into the Extraction of Aluminum from Coal Spoil through Kaolinite

作者：Qiao, X. C.[1];Si, P.[1];Yu, J. G.[2]

机构：[1]E China Univ Sci & Technol, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2008

卷号：42

期号：22

起止页码：8541

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20123415357704);WOS:【SCI-EXPANDED(收录号:WOS:000260921400059)】；

基金：The work described in this paper was funded by Shanghai Pujiang Program (Project No. PJ200700339) and Science and Technology Commission of Shanghai Municipality (Project No.07dz12027). We would also like to acknowledge the help and advice provided by Ms. ling Wang and Dr. Xingfu Song.

语种：英文

外文关键词：Aluminum - Decomposition - Metal recovery - Coal - Coal combustion - Extraction - Silica - Calcination - Kaolin - Mixtures

摘要：This research has applied kaolin and active carbon (AC) to the investigation of the recovery of aluminum from coal spol (CS). The kaolin, AC-containing kaolin mixture, and CS have been calcined at 500, 600, 700, 800, and 900 degrees C for 15, 30, 60, and 120 min. The transformation of kaolinite and aluminum extraction that occurred in each calcined sample have been characterized using XRD, TG, IR, and hydrochloric acid leaching methods. The dehydroxylation of kaolinite and the decomposition of metakaolin were influenced by thermal treatment temperature and time. The metakaolin had kept a portion of OH- in its structure until it was calcined at a temperature of 800 degrees C. Under 60 min treatment, new SiO2 phase was able to be formed at 500 degrees C, kaolinite was totally converted to metakaolin at 600 degrees C, and the SiO2 rejoined the reaction at 800 degrees C. The decompositions of CS were similar to those of kaolin mixture containing 20 wt % AC WC). The combustion of combustible matter accelerated the decomposition of kaolinite in the CS and MKC. Higher AC content led to lower aluminum extraction. The treatment at 600 degrees C was optimal for both CS and MKC.