Patent ID: 11859314
Assignee: CHANGZHOU UNIVERSITY
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing a large size beta-type ammonium tetramolybdate monocrystal particle, wherein, the method comprises:
industrial ammonium molybdate, ammonia water, and de-ionized water are used to prepare an ammonium molybdate solution with a concentration of 0.2˜0.6 g/ml; pH of the ammonium molybdate solution is adjusted to 5˜7, and temperature of the ammonium molybdate solution is adjusted to a first temperature of 70˜90° C. to obtain a first ammonium molybdate solution; and
a beta-type ammonium tetramolybdate crystal seed is put in a crystallization container, and the first ammonium molybdate solution is poured into the crystallization container to form a crystallization system; the crystallization system stands still at a room temperature, naturally cooling, and the beta-type ammonium tetramolybdate crystal seed grows up as a large size beta-type ammonium tetramolybdate monocrystal particle product,
wherein the beta-type ammonium tetramolybdate crystal seed is prepared by:
using industrial ammonium molybdate, ammonia water, and de-ionized water to prepare the ammonium molybdate solution with the concentration of 0.2˜0.6 g/ml;
adjusting the pH of the ammonium molybdate solution to 1˜2, adjusting the temperature of the ammonium molybdate solution to a second temperature of 70˜90° C. to obtain a second ammonium molybdate solution; and
stirring the second ammonium molybdate solution at a constant temperature of the second temperature, crystallizing at the constant temperature for 3˜5 mins, and filtering to obtain the beta-type ammonium tetramolybdate crystal seed.