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Ammonium heptamolybdate preparation method and apparatus thereof

A technology for ammonium heptamolybdate and production equipment, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve problems such as not being able to meet user requirements, achieve low light transmittance, improve quality, and reduce impurities

Inactive Publication Date: 2016-02-10
丁明
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Users have higher and higher requirements for material quality, and traditional technology can no longer meet user requirements

Method used

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  • Ammonium heptamolybdate preparation method and apparatus thereof

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Embodiment Construction

[0021] The preparation method of ammonium heptamolybdate comprises the steps of pickling, ammonia leaching, sedimentation and impurity removal, acid precipitation and evaporation crystallization:

[0022] Step (1) pickling: take molybdenum oxide: nitric acid = 10:1 ratio, the high-grade molybdenum oxide, wherein the molybdenum content is greater than 55%, the tungstophosphorus lead content is not more than 0.1%; the nitric acid concentration is greater than 98% and Higher purity requirements. Add an appropriate amount of deionized water to the solution, the conductivity of which is lower than 8s, the reaction temperature is ≥95°C, and the holding time is 1.5h to obtain an acid-washed filter cake;

[0023] Step (2) Ammonia immersion: put the acid-washed filter cake into an appropriate amount of deionized water, pass liquid ammonia to ph=9, the concentration of the liquid ammonia is greater than 98%, the reaction temperature is 75°C to 85°C, and the reaction time is ≤2h, pH is ...

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Abstract

The invention relates to an ammonium heptamolybdate preparation method and an apparatus thereof. The method comprises the steps of pickling, ammonia leaching, settlement impurity removal, acid precipitation and evaporative crystallization, wherein the settlement impurity removal is realized by introducing an ammonia leaching solution to a ceramic filtering device and filtering in order to obtain an ammonium molybdate solution; the ammonium molybdate solution undergoes ammonia leaching to obtain an ammonium heptamolybdate solution, and the ammonium heptamolybdate solution is evacuated and filtered at least two times to reduce impurities; and centrifuge drying is carried out after crystals precipitate to obtain finished ammonium heptamolybdate. The production apparatus comprises a reaction kettle and a plate frame, the middle portion of the reaction kettle is provided with a fine-aperture ceramic filtering plate, and a solution enters the reaction kettle from a reaction kettle inlet, and is filtered through the fine-aperture ceramic filtering plate under the action of filter pressing. The obtained ammonium heptamolybdate solution contains few impurities, and has a light transmittance reaching 0.01-0.02%T. A filtering device used by the apparatus is the micro-porous ceramic filtering plate, so the impurities in the solution are reduced, the product quality is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing ammonium heptamolybdate with less impurities and production equipment used in the method. Background technique [0002] Ammonium molybdate is one of the most widely used molybdates. It is the most important molybdenum intermediate product and molybdenum chemical product. In China, ammonium tetramolybdate has a large production scale and output, and its quality is relatively stable. However, heptamolybdate There are few ammonium manufacturers and the scale is small. In addition to the better chemical composition, there is still a certain gap compared with foreign countries in other aspects such as physical performance indicators and varieties. [0003] Ammonium heptamolybdate is an important intermediate product in the process of molybdenum metallurgy. It is the main raw material for the production of molybdenum powder, molybdenum wire and molybd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 丁明
Owner 丁明
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