Ammonium molybdate purification method and high-purity ammonium molybdate

Abstract

The invention discloses an ammonium molybdate purification method and high-purity ammonium molybdate. The purification method includes the steps: (1) dissolving ammonium molybdate in ammonia water to obtain ammonium molybdate solution; (2) adding chelating agents into the ammonium molybdate solution to remove impurity ions, and filtering the solution to obtain purified ammonium molybdate solution; (3) adding ammonium nitrate into the purified ammonium molybdate solution, stirring the solution until precipitates are generated, and then filtering the solution to obtain first filtrate; (4) adding ammonia water into the first filtrate to adjust a PH (potential of hydrogen) value to be 7-8, adding nitric acid to perform acid deposition crystallization and finally performing solid-liquid separation to obtain a solid phase; (5) drying the solid phase to obtain the high-purity ammonium molybdate. According to the purification method, the chelating agents and the ammonium nitrate are added into the ammonium molybdate solution to remove the impurity ions, and the purity of the ammonium molybdate is further improved by acid deposition crystallization to obtain the high-purity ammonium molybdate.

Description

technical field [0001] The invention belongs to the field of ammonium molybdate preparation, and more specifically relates to a method for purifying ammonium molybdate and high-purity ammonium molybdate. Background technique [0002] Ammonium molybdate (and ammonium paramolybdate; (T-4)-ammonium molybdate; ammonium tetramolybdate; diammonium molybdate;) is easy to purify, dissolve, and thermally dissociate, and the thermally dissociated NH3 gas can fully escape with heating, and no longer pollute molybdenum products. Therefore, ammonium molybdate is widely used as the basic raw material for the production of high-purity molybdenum products. For example, thermal dissociation of ammonium molybdate to produce high-purity molybdenum trioxide, hydrogen sulfide ammonium molybdate solution to produce high-purity molybdenum disulfide, ammonium molybdate to produce various molybdenum-containing chemical reagents, etc. Ammonium molybdate is also commonly used as the basic raw materi...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the raw materials for preparing ammonium molybdate, the preparation method of ammonium molybdate and the purification process of ammonium molybdate, the ammonium molybdate products will contain impurities such as iron, potassium, tungsten, phosphorus, arsenic, calcium and magnesium, And then cause the purity of ammonium molybdate product is not high; Therefore, it is necessary to provide a kind of purification method of ammonium molybdate, to improve the purity of ammonium molybdate product, satisfy people to the demand of high-purity ammonium molybdate