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Preparation method of high-purity palladium powder

A kind of palladium powder and high-purity technology is applied in the field of preparation of high-purity palladium powder, and can solve the problem that the purity of palladium powder cannot meet high-purity requirements and the like

Pending Publication Date: 2021-10-08
安徽拓思贵金属有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when it prepares palladium powder, the purity usually does not reach the high-purity requirement; for this reason, we propose a preparation method of high-purity palladium powder for solving the above problems

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  • Preparation method of high-purity palladium powder

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Embodiment Construction

[0020] Next, the technical solutions in the embodiments of the present invention will be apparent from the embodiment of the present invention, and it is clearly described, and it is understood that the described embodiments are merely embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, there are all other embodiments obtained without making creative labor without making creative labor premises.

[0021] See figure 1 The present invention provides a technical solution: a method of preparing high purlad palladium powder comprising heating the solid palladium metal after being heated into a beaker with HNO3 · 3HCl to dissolve, dissolve the solubility; dissolve is heated to boiling Up to the brown-free yellow gas, it is obtained from a solution after a nitride; the solution is added to the solution after the above-mentioned nitrate, the pH of the solution is adjusted, and the solution is stopped when the solution is tra...

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Abstract

The invention discloses a preparation method of high-purity palladium powder. The preparation method comprises the following steps of heating solid palladium metal, putting the solid palladium metal into a beaker with HNO3. 3HCl, heating until the solid palladium metal is dissolved, and taking a dissolved solution; heating the dissolved solution to boil until no brown yellow gas is emitted so as to obtain a saltpeter-removed solution; adding an alkalized substance into the saltpeter-removed solution, conducting stirring, adjusting the pH value of the solution, and stopping stirring when the solution is transparent; adding low-purity or low-density palladium powder into the transparent solution for induced replacement; and calcining precipitate of the solution added with the low-density palladium powder at a constant temperature of 45 DEG C for 4 hours, heating to 550 DEG C, introducing hydrogen for reduction, drying after reduction at a drying temperature of less than 200 DEG C, immediately introducing hydrogen for reduction for 2 hours after calcining hydrogen reduction heating, conducting cooling, conducting boiling and washing with a diluted hydrochloric acid and hydrofluoric acid mixed solution to remove impurities after the palladium powder is obtained, washing with deionized water, and drying to obtain the high-purity palladium powder.

Description

Technical field [0001] The present invention relates to the preparation of high purity palladium powder, and is specifically a method for preparing a high purity palladium powder. Background technique [0002] High purimplasia is widely used in defense, military, electronic and other industries, high purity palladium targets are irreplaceable materials in the semiconductor industry. With the development of semiconductor technology, the purity of palladium is getting higher and higher. At present, the preparation method of domestic high purity palladium is mainly comprising: preparation, ammonia distribution, combination method, etc. Precipitation of chloride is an ammonium chloride (II) acid solution into chlorine or add hydrogen oxidation, and then adding ammonium chloride precipitation of ammonium chloride (IV) acid ammonium acid, and the base metal impurities in the solution does not form an ammonium salt precipitate. However, palladium salt precipitation is not sufficient, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F9/26B22F1/00
CPCB22F9/24B22F9/26
Inventor 庞帅王志
Owner 安徽拓思贵金属有限公司
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