Method for synthesis of zinc molybdate or alkali type zinc molybdate

Abstract

The invention provides method for synthesizing the zinc molybdate or the basic zinc molybdate adopting the industrial zinc oxide and the ammonium molybdate as the raw materials through controlling different mole ratio between the zinc and the molybdenum. When the mole ratio between the zinc and the molybdenum is 0 to 1: 1, zinc molybdate can be obtained through the method; when the mol ratio of Zn / Mo more than 1:1, the basic zinc molybdate is obtained; the reaction temperature is 40 to 100 DEG C, and the reaction time is 0.5 to 12 hours, and the ammonia gas that is generated in the reaction is absorbed by the water for use; the mother solution that is centrifugally separated is used as the reacted zinc molybdate solution to be cycled for use. The content of the zinc molybdate that is synthesized with the method can reach 99 percent, and the content of the basic zinc molybdate can be more than 95 percent.

Description

Technical field: [0001] The invention relates to a method for synthesizing zinc molybdate or basic zinc molybdate. Background technique: [0002] Zinc molybdate or basic zinc molybdate, also known as molybdenum white, the molecular formula is XZnO ZnMoO 4 ·YH 2 O (zinc molybdate when X=0; basic zinc molybdate when X>0). Zinc molybdate and basic zinc molybdate can be used in various occasions as corrosion inhibitor, antirust pigment, flame retardant and smoke suppressant, etc. [0003] At present, the synthesis method of zinc molybdate and basic zinc molybdate includes the metathesis reaction of sodium molybdate (or ammonium molybdate) and zinc sulfate. Since the reaction is a liquid-liquid reaction, the zinc molybdate generated is relatively fine and difficult to centrifuge. , and a large amount of water-soluble salts are generated in the reaction process, if not washing, it will affect the quality of the product, but as washing, and because the water solubility of zin...

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Problems solved by technology

[0003] At present, the synthesis method of zinc molybdate and basic zinc molybdate includes the metathesis reaction of sodium molybdate (or ammonium molybdate) and zinc sulfate. Since the reaction is a liquid-liquid reaction, the zinc molybdate generated is relatively fine and difficult to be separated by centrifugation. , and a large amount of water-soluble salts are generated in the reaction process, if not washing, it will affect the quality of the product, but as washing, and because the water solubility of zinc molybdate is higher, the yield of the final product is lower, so In the actual production process, various body pigments are generally added, such as [China Chemical Products Encyclopedia, 2005.542]

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