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Ammonium rhenate with uniform granularity and preparation method thereof

An ammonium rhenate, uniform technology, applied in chemical instruments and methods, rhenium compounds, inorganic chemistry, etc., to achieve the effect of small grain size, narrow particle size distribution range, and high purity

Inactive Publication Date: 2019-12-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the existing ammonium rhenate recrystallization process, the purpose of the present invention is to provide a kind of ammonium rhenate with uniform particle size and its preparation method, adopting the homogeneous crystallization method, by controlling the recrystallization temperature, stirring intensity and crystallization Ammonium rhenate with controllable particle size and high purity can be prepared by means of time and other methods. This method can effectively control the recrystallization process of ammonium rhenate and improve the crystallization uniformity and particle size controllability of ammonium rhenate.

Method used

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  • Ammonium rhenate with uniform granularity and preparation method thereof
  • Ammonium rhenate with uniform granularity and preparation method thereof
  • Ammonium rhenate with uniform granularity and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Weigh 50.00g of commercial ammonium rhenate with a purity of 99% as a raw material, add water and heat to dissolve to 1200mL, put it in a rotary evaporator, evaporate and concentrate it to 800mL at 120°C, perform hot suction filtration to remove impurities, and put it in a crystallization reactor In the process, adjust the rotating speed of the stirring paddle in the range of 140-150rpm, first crystallize at 10°C for 45min, and then adjust the temperature of circulating water to crystallize at 5°C for 2.5h. Close the crystallization reactor, take out the ammonium rhenate crystals obtained after suction filtration of the sample, carry out natural air-drying, and weigh. After detection, ammonium rhenate D 50 It is 79.32μm, and the purity reaches more than 99.75%.

Embodiment 2

[0028] Weigh 50.00g of commercial ammonium rhenate with a purity of 99% as a raw material, add water and heat to dissolve to 1200mL, put it in a rotary evaporator, evaporate and concentrate it to 800mL at 120°C, perform hot suction filtration to remove impurities, and put it in a crystallization reactor In the process, adjust the rotating speed of the stirring paddle in the range of 200-210rpm, firstly crystallize at 10°C for 45min, and then adjust the temperature of circulating water to crystallize at 5°C for 2.5h. Close the crystallization reactor, take out the ammonium rhenate crystals obtained after suction filtration of the sample, carry out natural air-drying, and weigh. After detection, ammonium rhenate D 50 It is 71.17μm, and the purity is over 99.99%.

Embodiment 3

[0030] Weigh 50.00g of commercial ammonium rhenate with a purity of 99% as a raw material, add water and heat to dissolve to 1200mL, put it in a rotary evaporator, evaporate and concentrate it to 800mL at 120°C, perform hot suction filtration to remove impurities, and put it in a crystallization reactor In the process, adjust the rotating speed of the stirring paddle in the range of 100-110rpm, first crystallize at 10°C for 45min, and then adjust the temperature of the circulating water to crystallize at 5°C for 2.5h. Close the crystallization reactor, take out the ammonium rhenate crystals obtained after suction filtration of the sample, carry out natural air-drying, and weigh. After detection, ammonium rhenate D 50 It is 81.05μm, and the purity reaches more than 99.91%.

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Abstract

The invention discloses ammonium rhenate with uniform granularity and a preparation method thereof, and belongs to the technical field of ammonium rhenate purification. The method includes: with industrial crude ammonium rhenate crystals as raw materials, adding distilled water, and heating the solution until the distilled water is completely dissolved, evaporating the distilled water by using a rotary evaporator to form a supersaturated ammonium rhenate solution, adding the solution into a homogeneous crystallization reaction kettle to perform cooling and stirring crystallization, carrying out suction filtration on the recrystallized ammonium perrhenate, and naturally air-drying the product to obtain ammonium perrhenate crystal powder with uniform particle size distribution and high purity. The method has the advantages that compared with a traditional recrystallization method, the recrystallization process of ammonium rhenate can be effectively controlled, and the granularity and purity of ammonium rhenate particles are uniformly refined.

Description

Technical field: [0001] The invention relates to the technical field of ammonium rhenate purification, in particular to ammonium rhenate with uniform particle size and a preparation method thereof. Background technique: [0002] Ammonium rhenate can be used to manufacture platinum-rhenium bimetallic reforming catalysts, and is widely used in the field of precious metal catalysts in the petrochemical industry. Ammonium rhenate is also an important raw material for the manufacture of rhenium metal powder. It is used as an element additive in many rhenium-containing alloys. In addition, pure metal rhenium prepared by the reduction method of ammonium rhenate has excellent high-temperature strengthening properties. It is also used in alloy materials in the aerospace field and is a very critical rare resource. [0003] With the development of science and technology, ammonium rhenate purified by traditional methods cannot meet the requirements of industry, especially in the field ...

Claims

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Application Information

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IPC IPC(8): C01G47/00
CPCC01G47/00C01P2004/03C01P2004/61C01P2006/80
Inventor 陈振斌周亦胄孙元唐俊杰柳春丽
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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