Production technology of non agglomeration state ammonium dimolybedate

A kind of ammonium dimolybdate, the production process technology, applied in the direction of molybdenum compound, inorganic chemistry, chemical instrument and method, etc., can solve the problems of poor product performance, achieve good performance, short residence time, improve crystal form and particle size Effect

Inactive Publication Date: 2005-03-23
JINDUICHENG MOLYBDENUM GROUP CO LTD
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AI Technical Summary

Problems solved by technology

[0012] The invention solves the technical problems of poor performance of the physical indicators of the background technology and produced products

Method used

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Embodiment Construction

[0032] 1]. Prepare ammonium molybdate solution with specific gravity = 1.30-1.35, pH = 8.5-9, add it into the evaporation crystallization kettle, heat to boiling, and continue heating;

[0033] 2]. When the pH of the ammonium molybdate solution is around 6.9-7.5, add non-agglomerated ammonium dimolybdate small crystal seeds; the amount added is 5-30kg / m 3 The ammonium molybdate solution, the size of the added seed crystals is 10-150 microns;

[0034] 3]. Determine the evaporation rate curve according to the size of the seed crystal, the amount added and the volume of the ammonium molybdate solution. The unstable state equations of batch evaporation and crystallization can be combined with the material balance calculation formula to establish a theoretical evaporation rate operating curve that has no crystal nucleation during the isothermal evaporation process and the growth rate has nothing to do with the particle size; Actual operating curves adapted to equipment conditions....

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Abstract

The production process of ammonium dimolybdate of non-agglomeration state comprises 1) preparing ammonium molybdate solution, and then adding the solution into evaporation crystallization kettle, heating to boiling and continuing to heat; 2)adding minicrystal of ammonium dimolybdate when the PH of ammonium molybdate solution is 6.9-7.5; 3)determining vaporization rate curve; 4) crystal growth; 5) filtering, drying at 100-110 degree. The invention solve the techinical problems such as bad phsical index of background techinic and bad product performance. The crystallization course is improved and fine controled to improve the crystallographic form and grain size of ammonium dimolybdate. The original agglomeration state is changed into single crystal of non-agglomeration state to make the process of product and handling property good. The improvement of the crystallographic form and grain size of ammonium dimolybdate can be realized by adding crystal seed, eliminating cryptomere, controling vaporization rate to make the physical property index achieve to advanced world standard.

Description

technical field [0001] The invention relates to a production process of non-agglomerated ammonium dimolybdate. Background technique [0002] Ammonium dimolybdate [(NH 4 ) 2 Mo 2 o 7 ], referred to as ADM, is one of the isopolyacid ammonium salts of molybdenum, and is an important raw material for subsequent processing of molybdenum products. Its performance indicators are directly related to the processing and performance of subsequent molybdenum metal products. As a compound, the performance of ammonium dimolybdate is affected by the chemical composition; at the same time, as a crystal, the performance is more affected by physical properties such as particle size, crystal form, loose specific gravity, etc. The chemical composition indicators of products produced by the existing domestic technology can generally meet the requirements, but the physical indicators, especially the difficult-to-control crystal form, make the product performance quite different from that of f...

Claims

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Application Information

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IPC IPC(8): C01G39/00
Inventor 王仙琴唐利侠罗建海唐军利郭军刚杨刘晓赵宝华王维娜
Owner JINDUICHENG MOLYBDENUM GROUP CO LTD
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