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Preparation method of beta type ammonium tetramolybdate

A technology of ammonium tetramolybdate and ammonium molybdate, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve problems such as the influence of processing performance and the difficulty in controlling the transformation rate of β-type ammonium tetramolybdate

Active Publication Date: 2014-07-09
洛阳栾川钼业集团钨业有限公司
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Problems solved by technology

The molybdenum powder made of β-type ammonium tetramolybdate has excellent performance in follow-up processing such as bulk ratio and particle size, but it is difficult to control the transformation rate of β-type ammonium tetramolybdate, and its purity is critical for the subsequent production of molybdenum powder. The impact on the processing performance of molybdenum and molybdenum products is relatively obvious, so it is necessary to find a production method of β-type ammonium tetramolybdate with a high conversion rate and stable and efficient

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  • Preparation method of beta type ammonium tetramolybdate
  • Preparation method of beta type ammonium tetramolybdate
  • Preparation method of beta type ammonium tetramolybdate

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Embodiment Construction

[0019] The preparation method of the β-type ammonium tetramolybdate of the present embodiment includes salt pretreatment of molybdenum oxide, preparation of ammonium molybdate solution, acid precipitation, transformation and drying steps; wherein, during acid precipitation, the specific gravity is 1.14-1.16 g / cm 3 The ammonium molybdate solution is filtered and poured into the acid precipitation crystallization tank, stirred and passed into nitric acid, and the pH value of the solution is checked at any time during the acid addition process. When the pH value of the solution reaches 4, the acid addition is stopped and the solution in the reactor is checked. Keep the temperature at 60°C±5°C, and then continue to add acid slowly; during this period of acid addition process, the acid addition speed should be strictly controlled, the pH value should be checked at any time, and the acid addition speed should be gradually slowed down according to the change of pH value, and finally c...

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Abstract

The invention discloses a preparation method of beta type ammonium tetramolybdate. Three links of acid precipitation, transformation and drying are improved, wherein the beta type ammonium tetramolybdate transformed in the traditional mode is added in the acid precipitation process, then, the traditional low-temperature transformation or drying transformation mode is changed into the high-temperature transformation, and next, the drying is carried out. During the production transformation, the humidity, the temperature and the pressure required during the transformation are considered, the transformation is carried out at a higher temperature, a certain humidity and a certain pressure, the transformation rate of the beta type ammonium tetramolybdate is ensured, the transformation time is also shortened, the transformation rate of the ammonium tetramolybdate reaches more than 95 percent, meanwhile, the beta type ammonium tetramolybdate which has high purity and strong forgeability and drawability on deep-processing molybdenum products through the physical performance such as product appearance, granularity, apparent density and crystal structure is prepared, the quality and the performance of the beta type ammonium tetramolybdate are greatly improved, and reliable raw materials are provided for the subsequent deep processing.

Description

technical field [0001] The invention relates to the technical field of production technology of ammonium tetramolybdate, in particular to a preparation method of β-type ammonium tetramolybdate. Background technique [0002] With the development of molybdenum deep processing technology, the plasticity requirements of processed molybdenum products are getting higher and higher. For ammonium molybdate, the deep-processing raw material of molybdenum, its crystal structure and other physical properties are directly related to the forgeability and drawability of deep-processed molybdenum products. The molybdenum powder made of β-type ammonium tetramolybdate has excellent performance in follow-up processing such as bulk ratio and particle size, but it is difficult to control the transformation rate of β-type ammonium tetramolybdate, and its purity is critical for the subsequent production of molybdenum powder. The processing performance of molybdenum and molybdenum products is mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00
Inventor 郭红波陈宁许明臣王斌杜开亮张红涛党卷生李文阁徐君涛
Owner 洛阳栾川钼业集团钨业有限公司
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