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Method for short process preparation of superfine platinum powder

A technology of ultra-fine platinum powder and short process, which is applied in the field of short-process preparation of ultra-fine platinum powder to achieve the effect of simplifying the production process

Inactive Publication Date: 2018-11-30
XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process must add a certain amount of dispersant to the solution to prevent and limit the growth of crystal nuclei, and this process cannot directly deal with insoluble platinum salts

Method used

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  • Method for short process preparation of superfine platinum powder
  • Method for short process preparation of superfine platinum powder
  • Method for short process preparation of superfine platinum powder

Examples

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Effect test

Embodiment 1

[0026] A method for preparing superfine platinum powder in a short flow process, specifically comprising the following steps:

[0027] (1) Preparation of platinum-containing aqueous phase: Weigh 30 g of ammonium chloroplatinate solid in a beaker, add 300 ml of deionized water, and stir evenly;

[0028] (2) Adjustment of the pH value of the platinum-containing aqueous phase: adding dropwise a sodium hydroxide solution with a mass fraction of 5% in a stirred state to adjust the pH of the aqueous phase to 8;

[0029] (3) The preparation of reducing agent: take by weighing 33.8g mass fraction and be the hydrazine hydrate solution of 40%, add the deionized water of equal mass, it is diluted to mass fraction and be 20%, standby as reducing agent; The consumption of hydrazine hydrate is 4 times the theoretical amount of reduced platinum;

[0030] (4) Adjustment of the platinum-containing water phase temperature: heating in a water bath to maintain the system temperature at 50°C;

...

Embodiment 2

[0034] A method for preparing superfine platinum powder in a short flow process, specifically comprising the following steps:

[0035] (1) Preparation of platinum-containing aqueous phase: take 30 g of ammonium chloroplatinate solid in a beaker, add 450 ml of deionized water, and stir evenly;

[0036] (2) Adjustment of the pH value of the platinum-containing aqueous phase: adding dropwise a sodium hydroxide solution with a mass fraction of 5% in a stirred state to adjust the pH of the aqueous phase to 6;

[0037] (3) The preparation of reducing agent: take by weighing 25.4g mass fraction and be the hydrazine hydrate solution of 40%, add the deionized water of equal mass, it is diluted to mass fraction and be 20%, standby as reducing agent; The consumption of hydrazine hydrate is 3 times the theoretical amount of reduced platinum;

[0038] (4) Adjustment of the platinum-containing water phase temperature: heating in a water bath to maintain the system temperature at 50°C;

[...

Embodiment 3

[0042] A method for preparing superfine platinum powder in a short flow process, specifically comprising the following steps:

[0043] (1) Preparation of platinum-containing aqueous phase: take 30 g of ammonium chloroplatinate solid in a beaker, add 600 ml of deionized water, and stir evenly;

[0044] (2) Adjustment of the pH value of the platinum-containing aqueous phase: drip an ammonia solution with a mass fraction of 25% under stirring, and adjust the pH of the aqueous phase to 4;

[0045] (3) The preparation of reducing agent: take by weighing 16.9g mass fraction and be the hydrazine hydrate solution of 40%, add the deionized water of equal mass, it is diluted to mass fraction and be 20%, standby as reducing agent; The consumption of hydrazine hydrate is 2 times the theoretical amount of reduced platinum;

[0046] (4) Adjustment of the temperature of the platinum-containing aqueous phase: heating in a water bath to maintain the system temperature at 40°C;

[0047] (5) P...

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Abstract

The invention discloses a method for short process preparation of superfine platinum powder. Specifically, a certain amount of ammonium chloroplatinate solid is weighed, deionized water is added, andthe specific value of the volume of the deionized water to the mass of the ammonium chloroplatinate solid is (10-20):1 (ml / g); aqueous alkali is used for adjusting the aqueous phase pH to be 4-8; a hydrazine hydrate solution with the mass fraction being 40% is weighed, attenuation is carried out to enable the mass fraction to be 20%, and the solution obtained after attenuation is used as a reducing agent for standby application, and the using amount of the hydrazine hydrate is 2-4 times the theoretical using amount of reducing platinum; heating is carried out, and the system temperance is maintained to be 40-50 DEG C; under the stirring condition, a reducing agent is dropwise added into a platinum containing water phase slowly, the aqueous alkali is used for adjusting the aqueous phase pHin the phase, and the pH value is maintained to be 4-8; after the reducing agent is completely added, stirring is carried out for 0.5-1 h; and the superfine platinum powder is obtained after filtering, washing and drying. According to the method, a solid phase reduction method is adopted, the ammonium chloroplatinate solid is restored directly, meanwhile, the superfine platinum powder with the small prepared size can be prepared under the condition that a dispersing agent is not added, the technology is simple, and the flow is short.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, relates to the recovery and utilization of precious metal platinum, and in particular relates to a method for preparing superfine platinum powder in a short process. Background technique [0002] Ultrafine platinum powder is widely used in the preparation of thick film paste in the electronics industry, such as platinum electrode paste, platinum palladium electrode paste, platinum electrode paste, etc. These pastes can be used to produce catalytic platinum in automotive oxygen sensors and solar cells Electrodes, platinum electrodes for temperature sensors, and other electrodes or wires that require high catalytic activity and high reliability. Ultrafine platinum powder is the main functional phase in the platinum electrode slurry, and its morphology, particle size, distribution, and dispersibility all have a major impact on the properties of the slurry, and ultimately affect the perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
CPCB22F9/20
Inventor 张帆廖秋玲姜东张邦胜刘贵清郑远东龚卫星姚现召王芳解雪
Owner XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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