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:
Jul. 18, 2023
Filed:
Nov. 23, 2022
Central South University, Changsha, CN;
Jiangtao Li, Changsha, CN;
Zhongwei Zhao, Changsha, CN;
Zhichao Li, Changsha, CN;
Xingyu Chen, Changsha, CN;
Xuheng Liu, Changsha, CN;
Lihua He, Changsha, CN;
Fenglong Sun, Changsha, CN;
Yongjin Luo, Changsha, CN;
Muye Cui, Changsha, CN;
CENTRAL SOUTH UNIVERSITY, Changsha, CN;
Abstract
A method for crystallization of β-ammonium tetramolybdate includes: performing a stepwise pH-adjusting treatment of an ammonium molybdate solution via zoning to obtain the β-ammonium tetramolybdate. When feeding the ammonium molybdate solution into a reaction system from a first zone and then into second to sixth zones successively, pHof a resultant solution in the first zone is 7.0-6.0; pHof a resultant solution in the second zone is less than 6 and greater than or equal to 4; pHof a resultant solution in the third zone is less than 4 and greater than or equal to 2.5; pHof a crystallized slurry in the fourth zone is less than 2.5 and greater than or equal to 1; pHof a crystallized slurry in the fifth zone is 2.5-4.0; and pHof a crystallized slurry in the sixth zone is less than 2.5 and greater than or equal to 2.0.