Preparation method of ammonium dimolybdate

A technology of ammonium dimolybdate and ammonium tetramolybdate, which is applied in the fields of chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., and can solve problems such as mixing of impurities, shortage of water resources, difficulty in controlling the purity of ammonium dimolybdate products, etc.

Active Publication Date: 2017-08-15
CENT SOUTH UNIV
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Problems solved by technology

However, the use of a large amount of water will not only cause a shortage of water resources, but the ammonia-containing wastewater cannot be discharged directly after the production is over, and can only be evaporated and crystallized, resulting in high energy consumption; moreover, it is difficult to control the purity of ammonium dimolybdate products, and impurities are easily mixed in

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  • Preparation method of ammonium dimolybdate

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[0022] The invention provides a kind of preparation method of ammonium dimolybdate, comprises the following steps:

[0023] The molybdenum source and the ammonium source are subjected to a metathesis reaction to obtain ammonium dimolybdate;

[0024] The molybdenum source is ammonium tetramolybdate and / or molybdic acid;

[0025] The ammonium source is one or more of ammonia water, ammonium bicarbonate and ammonium carbonate.

[0026] In the invention, the molybdenum source and the ammonium source are subjected to metathesis reaction to obtain ammonium dimolybdate. In the present invention, the molybdenum source is ammonium tetramolybdate and / or molybdic acid; the ammonium source is one or more of ammonia water, ammonium bicarbonate and ammonium carbonate. The present invention does not have any special requirements on the source of the molybdenum source and the ammonium source, and the commercially available molybdenum source and ammonium source well known to those skilled in...

Embodiment 1

[0057] The mass ratio of ammonium tetramolybdate, ammonium bicarbonate and water is 15:3.9:0.25, mix evenly, the temperature is 80°C, the pressure is 0.13MPa, and the reaction time is 2h to obtain the ammonium dimolybdate product. The ammonium dimolybdate that the present embodiment obtains carries out X-ray detection, and its result is as follows figure 1 shown. The X-ray diffraction analysis results show that the product has a single phase, and the ammonium dimolybdate product has a purity >99%.

Embodiment 2

[0059] The mass ratio of ammonium tetramolybdate, ammonium bicarbonate and water is 15:4.2:0.5, mix uniformly, the temperature is 60°C, the pressure is 0.12MPa, and the reaction time is 2h, the product is obtained. The X-ray diffraction analysis results show that there is The phase is single, and the purity of the ammonium dimolybdate product is >99%.

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Abstract

The invention provides a preparation method of ammonium dimolybdate. The preparation method comprises the following step of carrying out complex decomposition reaction on a molybdenum source and an ammonium source to obtain the ammonium dimolybdate. According to the preparation method, ammonium tetramolybdate and / or molybdic acid is used as the molybdenum source and one or more of ammonia water, ammonium hydrogen carbonate and ammonium carbonate are used as the ammonium source; a lot of solvents and water are not needed so that the preparation method is environmentally friendly and economical. The result of the embodiment shows that the preparation method provided by the invention can be used for successfully preparing the ammonium dimolybdate and the purity of the ammonium dimolybdate is more than 99 percent.

Description

technical field [0001] The invention relates to the technical field of ammonium molybdate, in particular to a preparation method of ammonium dimolybdate. Background technique [0002] Ammonium dimolybdate is a commonly used ammonium molybdate, the molecular formula is (NH 4 ) 2 Mo 2 o 7 . At present, ammonium dimolybdate is widely used in dyes, pigments, catalysts, fire retardants, trace element fertilizers, ceramic pigments and raw materials for the synthesis of other compounds. [0003] At present, the methods for producing ammonium dimolybdate in the prior art generally need to react in an aqueous solution, and obtain the target product through a series of processes such as acid precipitation, ammonia dissolution, evaporation and crystallization. However, the use of a large amount of water will not only cause a shortage of water resources, but the ammonia-containing wastewater cannot be discharged directly after the production is over, and can only be evaporated and ...

Claims

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Application Information

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IPC IPC(8): C01G39/00
CPCC01G39/00C01P2006/80
Inventor 周秋生杨利群李小斌彭志宏刘桂华齐天贵
Owner CENT SOUTH UNIV
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