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Preparation method of ammonium paratungstate composite powder comprising rare earth

A technology of ammonium paratungstate and ammonium tungstate, which is applied in the field of cemented carbide material preparation, can solve problems such as uneven distribution of rare earth, and achieve the effects of refining APT particle size, improving dispersibility, and easy operation

Active Publication Date: 2019-02-22
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of uneven distribution of rare earth in rare earth cemented carbide and provide a kind of APT / rare earth salt composite powder in which rare earth is fully and uniformly dispersed, the present invention proposes a preparation method of rare earth-containing ammonium paratungstate composite powder

Method used

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  • Preparation method of ammonium paratungstate composite powder comprising rare earth
  • Preparation method of ammonium paratungstate composite powder comprising rare earth
  • Preparation method of ammonium paratungstate composite powder comprising rare earth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the APT workshop of a certain factory to use the soda high pressure leaching method, and then use the ion exchange method to produce 300ml of the second-stage liquid ammonium tungstate solution after impurity removal in a stirring pot, WO 4 2- The concentration is 260g / L, and the temperature should not be higher than 40℃.

[0027] Weigh 0.05 g of yttrium nitrate, add it to a beaker containing 5 ml of deionized water, and stir with a glass rod until the yttrium nitrate is completely dissolved. While stirring the ammonium tungstate solution at a speed of 60 rad / min, slowly add the yttrium nitrate solution to the ammonium tungstate solution, keep stirring for 5 minutes, and keep the temperature not higher than 40°C to obtain the ammonium tungstate / rare earth salt precursor composite solution .

[0028] Transfer the precursor composite solution to a magnetic stirrer and heat to 80°C for evaporation and crystallization. The magnetic stirring rotor rotates at 120 rad / min. Whe...

example 2

[0030] Take the APT workshop of a certain factory to use the soda high pressure leaching method, and then use the ion exchange method to produce 300ml of the second-stage liquid ammonium tungstate solution after impurity removal in a stirring pot, WO 4 2- The concentration is 260g / L, and the temperature should not be higher than 40℃.

[0031] Weigh 2.19 g of yttrium nitrate, add it to a beaker containing 5 ml of deionized water, and stir with a glass rod until the yttrium nitrate is completely dissolved. While stirring the ammonium tungstate solution at a speed of 60 rad / min, slowly add the yttrium nitrate solution to the ammonium tungstate solution, keep stirring for 5 minutes, and keep the temperature not higher than 40°C to obtain the ammonium tungstate / rare earth salt precursor composite solution .

[0032] Transfer the precursor composite solution to a magnetic stirrer and heat to 80°C for evaporation and crystallization. The magnetic stirring rotor rotates at 120 rad / min. Whe...

example 3

[0034] Take the APT workshop of a certain factory to use the soda high pressure leaching method, and then use the ion exchange method to produce 300ml of the second-stage liquid ammonium tungstate solution after impurity removal in a stirring pot, WO 4 2- The concentration is 260g / L, and the temperature should not be higher than 40℃.

[0035] Weigh 5.55 g of yttrium nitrate, add it to a beaker containing 5 ml of deionized water, and stir with a glass rod until the yttrium nitrate is completely dissolved. While stirring the ammonium tungstate solution at a speed of 60 rad / min, slowly add the yttrium nitrate solution to the ammonium tungstate solution, keep stirring for 5 minutes, and keep the temperature not higher than 40°C to obtain the ammonium tungstate / rare earth salt precursor composite solution .

[0036] Transfer the precursor composite solution to a magnetic stirrer and heat to 80°C for evaporation and crystallization. The magnetic stirring rotor rotates at 120 rad / min. Whe...

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Abstract

The invention relates to a preparation method of ammonium paratungstate composite powder comprising rare earth. The preparation method comprises an alkaline method or an acidic method for obtaining ammonium tungstate solution as well as the impurity removal and evaporation crystallization of the ammonium tungstate solution. The method adds the rare-earth element into the pure ammonium tungstate solution in a form of rare-earth salt solution to obtain the ammonium paratungstate / rare-earth salt composite powder with the rare-earth element being sufficiently and uniformly distributed. The preparation method comprises the following steps: (1) preparing the ammonium tungstate solution; (2) preparing a uniform and stable rare-earth salt solution; (3) preparing a precursor composite solution; and(4) evaporating crystallizing, and obtaining the ammonium paratungstate composite powder comprising the rare earth. The rare-earth salt solution is directly added in the intermediate product ammoniumtungstate solution for preparing the APT, and then the ammonium paratungstate / rare-earth salt composite powder is obtained by virtue of evaporation crystallization, and the mass production of the ammonium paratungstate / rare-earth salt composite powder can be realized by slightly modifying the existing industrialized APT production line.

Description

Technical field [0001] The invention relates to a method for preparing rare earth-containing ammonium paratungstate composite powder, which belongs to the technical field of hard alloy material preparation. Background technique [0002] Cemented carbide has high hardness, strength, wear resistance and corrosion resistance, and is known as "industrial teeth". It can not only be used in various tools, abrasive tools, precision bearings and cylinder linings, but also widely used Oil drilling, mining tools, electronic communications and other fields. With the rapid development of high-precision weapons, the rise of high-tech equipment manufacturing levels, the rapid progress of cutting-edge science and technology, and the rapid advancement of nuclear energy technology, the requirements for the comprehensive performance and quality stability of cemented carbide products have greatly increased. Rare earth elements have a series of functions such as grain refinement, interface purifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01F17/00
CPCC01G41/006C01P2002/72C01P2002/85C01P2004/80C01F17/276
Inventor 刘觐杨艳玲易志强谭敦强廖先金陆磊付远
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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