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:
Aug. 19, 2014
Filed:
Feb. 09, 2010
Xiaowei Huang, Beijing, CN;
Zhiqi Long, Beijing, CN;
Hongwei LI, Beijing, CN;
Dali Cui, Beijing, CN;
Xinlin Peng, Beijing, CN;
Guilin Yang, Beijing, CN;
Yongke Hou, Beijing, CN;
Chunmei Wang, Beijing, CN;
Shunli Zhang, Beijing, CN;
Xiaowei Huang, Beijing, CN;
Zhiqi Long, Beijing, CN;
Hongwei Li, Beijing, CN;
Dali Cui, Beijing, CN;
Xinlin Peng, Beijing, CN;
Guilin Yang, Beijing, CN;
Yongke Hou, Beijing, CN;
Chunmei Wang, Beijing, CN;
Shunli Zhang, Beijing, CN;
Grirem Advanced Materials Co., Ltd., Beijing, CN;
Abstract
The present invention relates to a method of precipitation of metal ions. Mineral(s), oxide(s), hydroxide(s) of magnesium and/or calcium are adopted as raw materials, and the raw material(s) is processed through at least one step of calcination, slaking, or carbonization to produce aqueous solution(s) of magnesium bicarbonate and/or calcium bicarbonate, and then the solution(s) is used as precipitant(s) to deposit rare earth, such as nickel, cobalt, iron, aluminum, gallium, indium, manganese, cadmium, zirconium, hafnium, strontium, barium, copper and zinc ions. And at least one of metal carbonates, hydroxides or basic carbonates is obtained, or furthermore the obtained products are calcined to produce metal oxides. The invention takes the cheap calcium and/or magnesium minerals or their oxides, hydroxides with low purity as raw materials to instead common precipitants such as ammonium bicarbonate and sodium carbonate etc. The calcium, magnesium, carbon dioxide etc are efficiently and circularly used, and the environment pollution by ammonium-nitrogen wastewater, high concentration salts wastewater is avoided, and both of the discharge of greenhouse gas carbon dioxide and the production cost of metal are decreased.