Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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New technology for comprehensive utilization of aluminum-chromium residue from chromium salts production
LI Xiao-bin(李小斌), QI Tian-gui(齐天贵)1, JIANG Xin-min(江新民)1,ZHOU Qiu-sheng(周秋生)1, LIU Gui-hua(刘桂华)1, PENG Zhi-hong(彭志宏)1, HAN Deng-lun(韩登仑)2, ZHANG Zhong-yuan(张忠元)2, YANG Kun-shan

1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;2. Gansu Jinshi Chemical Engineering Corporation, Ltd., Zhangye 734000, China

Abstract:Colloidal aluminum-chromium residue(ACR) was mass-produced in chromate production process, and the large energy consumption and high recovery cost existed in traditional methods of utilizing such ACR. To overcome those problems, a new comprehensive method was proposed to deal with the ACR, and was proven valid in industry. In the new process, the chromate was separated firstly from the colloidal ACR by ripening and washing with additives, by which more than 95% hexavalent chromium was recovered. The chromium-free aluminum residue(CFAR), after properly dispersed, was digested at 120−130 ℃ and more than 90% alumina can be recovered. And then the pregnant aluminate solution obtained from digestion was seeded to precipitate aluminum hydroxide. This new method can successfully recover both alumina and sodium chromate, and thus realize the comprehensive utilization of ACR from chromate industry.


Key words: utilization; aluminum-chromate residue(ACR); aluminum hydroxide; sodium chromate hydrate

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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