公开(公告)号：US20230158424A1

公开(公告)日：2023-05-25

申请号：US17992949

申请日：2022-11-23

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Jiangtao LI ,  Zhongwei ZHAO ,  Zhichao LI ,  Xingyu CHEN ,  Xuheng LIU ,  Lihua HE ,  Fenglong SUN ,  Yongjin LUO ,  Muye CUI

IPC: B01D9/00 ,  C01G39/00

CPC classification number: B01D9/0063 ,  B01D9/005 ,  C01G39/006 ,  B01D2009/0086 ,  C01P2002/72 ,  C01P2004/03

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, pH1 of a resultant solution in the first zone is 7.0-6.0; pH2 of a resultant solution in the second zone is less than 6 and greater than or equal to 4; pH3 of a resultant solution in the third zone is less than 4 and greater than or equal to 2.5; pH4 of a crystallized slurry in the fourth zone is less than 2.5 and greater than or equal to 1; pH5 of a crystallized slurry in the fifth zone is 2.5-4.0; and pH6 of a crystallized slurry in the sixth zone is less than 2.5 and greater than or equal to 2.0.