The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 2013
Filed:
Apr. 27, 2011
Zhaohua Guo, Beijing, CN;
Cundi Wei, Beijing, CN;
Peiping Zhang, Beijing, CN;
Jianguo Han, Beijing, CN;
Junzhou Chi, Beijing, CN;
Yanbin Sun, Beijing, CN;
Yixin Zhao, Beijing, CN;
Zhaohua Guo, Beijing, CN;
Cundi Wei, Beijing, CN;
Peiping Zhang, Beijing, CN;
Jianguo Han, Beijing, CN;
Junzhou Chi, Beijing, CN;
Yanbin Sun, Beijing, CN;
Yixin Zhao, Beijing, CN;
China Shenhua Energy Company Limited, Beijing, CN;
Abstract
Provided a method for preparing metallurgical-grade alumina by using fluidized-bed fly ash, comprising: a) removing iron by wet magnetic separation after crushing the fly ash; b) reacting the fly ash after magnetic separation with hydrochloric acid to obtain a hydrochloric leachate; c) passing the hydrochloric leachate through macro-porous cationic resin to deeply remove iron to obtain a refined aluminum chloride solution; d) concentrating and crystallizing the refined aluminum chloride solution to obtain an aluminum chloride crystal; and e) calcining the aluminum chloride crystal to obtain the metallurgical-grade alumina. The method is simple, the procedure is easy to be controlled, the extraction efficiency of alumina is high, the production coast is low, and the product quality is steady.