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Palladium powder production method without palladium mirror

A production method and technology for palladium powder are applied in the field of palladium powder production for removing palladium mirrors, and can solve the problems of difficulty in cleaning and the reduction of production efficiency by palladium sheets, and achieve the effects of improving production efficiency and reducing production loss.

Active Publication Date: 2019-12-06
英特派铂业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the palladium raw materials are transformed from palladium powder. However, palladium mirror phenomenon often exists in the production process of palladium powder, and as the production process proceeds, the palladium mirror will grow rapidly and form palladium sheets adhered The surface of the reaction vessel is difficult to clean in the later stage, and the existence of a large number of palladium flakes also significantly reduces the production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of palladium complex solution: Weigh 1kg of palladium diamine dichloride into a 5L beaker, add 1L of deionized water, then place on a heating platform and heat to 40°C, and stir evenly to obtain a solution to be reduced.

[0025] (2) Adding salt: Add 200 g of sodium chloride to the reducing solution obtained in the above step (1), and stir the reaction slurry evenly.

[0026] (3) Addition of reducing agent: Weigh 500 g of sodium citrate, slowly add the solution obtained in step (2) while stirring, and add the materials for a total of about 1 hour. Stirring was then continued until the color of the solution became colorless.

[0027] (4) suction filtration drying: the reaction solution gained in step (3) is suction filtered to obtain the first product of palladium powder; ultrapure water washing 5 times; the palladium powder obtained by suction filtration washing is placed in an oven for drying, and the drying temperature at 100°C to prepare palladium po...

Embodiment 2

[0029] (1) Palladium complex solution configuration: Weigh 10 kg of palladium dichloride and place it in a 50L reaction kettle, add 30L of deionized water, then heat the solution to 90°C and stir evenly to obtain the solution to be reduced.

[0030] (2) Adding salt: Add 1.5 kg of ammonium chloride to the reducing solution obtained in the above step (1), and stir the reaction slurry evenly.

[0031] (3) Addition of reducing agent: Weigh 6 kg of sodium citrate borohydride, slowly add the solution obtained in step (2) while stirring, and add the materials for a total of about 5 hours. Stirring was then continued until the color of the solution became colorless.

[0032] (4) suction filtration drying: the reaction solution gained in step (3) is suction filtered to obtain the first product of palladium powder; ultrapure water washing 5 times; the palladium powder obtained by suction filtration washing is placed in an oven for drying, and the drying temperature at 70°C to prepare p...

Embodiment 3

[0034] (1) Palladium complex solution configuration: Weigh 5 kg of palladium tetraammine dichloride and place it in a 50 L reaction kettle, add 20 L of deionized water, then heat the solution to 60° C., and stir evenly to obtain a solution to be reduced.

[0035] (2) Adding salt: Add 1 kg of ammonium chloride to the reducing solution obtained in the above step (1), and stir the reaction slurry evenly.

[0036] (3) Addition of reducing agent: Weigh 1 kg of hydrazine hydrate, slowly add the solution obtained in step (2) while stirring, and add the materials for a total of about 3 hours. Stirring was then continued until the color of the solution became colorless.

[0037] (4) suction filtration drying: the reaction solution gained in step (3) is suction filtered to obtain the first product of palladium powder; ultrapure water washing 5 times; the palladium powder obtained by suction filtration washing is placed in an oven for drying, and the drying temperature at 150°C to prepa...

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Abstract

The invention discloses a palladium powder production method without a palladium mirror. The palladium powder production method includes the following steps that (1) a palladium complex is added intodeionized water for heating, even mixing is conducted, and to-be-reduced liquid is obtained; (2) salt is added into the to-be-reduced liquid obtained in the step (1), and even stirring is conducted; (3) a reducing agent is added into a solution obtained in the step (2), and stirring is conducted till the color of the solution becomes colorless; and (4) reaction liquid obtained in the step (3) is subjected to suction filtration to obtain an initial palladium powder product, drying is conducted after washing with ultrapure water is conducted, and a palladium powder product is obtained. The palladium powder production method has the advantages: the salt is introduced into the to-be-reduced liquid, on the one hand, the salt can achieve the effect of dull polish with a reaction vessel, and theproduced palladium mirror is quickly stripped; on the other hand, the salt can achieve a stabilizing effect on a reduction system, and a palladium mirror phenomenon is weakened. According to the palladium powder production method, the palladium mirror phenomenon in the palladium powder production process is removed, the palladium powder production efficiency is greatly improved, the product pass rate is greatly increased, and meanwhile, the production loss in the palladium powder production process is also reduced.

Description

technical field [0001] The application relates to the technical field of metal materials, in particular to a palladium powder production method for removing palladium mirrors. Background technique [0002] Due to their excellent physical and chemical properties, platinum group metals have become indispensable and precious materials for the development of science and technology. Because of their high price, they are generally used in key core parts and are known as "industrial vitamins". [0003] As one of the important precious metals, palladium has irreplaceable physical and chemical properties, such as ultra-high electrical conductivity, strong hydrogen absorption and excellent catalytic performance, so it is widely used in various industrial fields. At present, most of the palladium raw materials are transformed from palladium powder. However, palladium mirror phenomenon often exists in the production process of palladium powder, and as the production process proceeds, th...

Claims

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24Y02P10/20
Inventor 王来兵秦喜超熊雅玲金英杰刘虎
Owner 英特派铂业股份有限公司
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