公开(公告)号：US11859314B2

公开(公告)日：2024-01-02

申请号：US17834238

申请日：2022-06-07

Applicant: ZHENGZHOU UNIVERSITY

Inventor： Xiaochao Wu ,  Qingkui Li ,  Jing Zhang ,  Kaijun Yang ,  Chengduo Wang ,  Jilin He

IPC: C30B7/08 ,  C30B33/02

CPC classification number: C30B7/08 ,  C30B33/02

Abstract: A method for preparing large size beta-type ammonium tetramolybdate monocrystal particle includes industrial ammonium molybdate, ammonia, de-ionized water are used to prepare ammonium molybdate solution with concentration of 0.2˜0.6 g/ml; pH is adjusted to 5˜7, temperature is adjusted to the first temperature of 70˜90° C. to obtain the first ammonium molybdate solution; beta-type ammonium tetramolybdate crystal seed is put into crystallization container, and the first ammonium molybdate solution is poured in the crystallization container, to form crystallization system; the crystallization system stands still at room temperature, naturally cooling, the beta-type ammonium tetramolybdate crystal seed grows into large size beta-type ammonium tetramolybdate monocrystal particle. A beta-type ammonium tetramolybdate crystal seed is obtained by constant-temperature crystallization at 70˜90° C. The obtained beta-type ammonium tetramolybdate crystal seed is put stewing in the first ammonium molybdate solution and is naturally cooling to produce large size beta-type ammonium tetramolybdate monocrystal particle forms.