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A kind of preparation method of modified ultrafine precious metal powder

A precious metal and powder technology, applied in the field of preparation of modified ultrafine precious metal powder, to achieve the effect of improving tap density, changing tap density, and improving dispersibility

Active Publication Date: 2019-08-09
王芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a method for preparing modified ultrafine precious metal powders to solve the problems of preventing various agglomerations

Method used

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  • A kind of preparation method of modified ultrafine precious metal powder
  • A kind of preparation method of modified ultrafine precious metal powder
  • A kind of preparation method of modified ultrafine precious metal powder

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preparation example Construction

[0024] Such as figure 1 As shown in the flowchart, the preparation method mainly includes steps from the generalized technical scheme: 1. Prepare the reducing solution, weigh the reducing agent and dissolve it in deionized water, and keep the concentration of the reducing agent in the reducing solution at 0.05 mol / liter to 9 mol / L, fully stir until the reducing agent is completely dissolved, then add additives and protective agents to continue fully stirring and maintain a constant temperature state, the constant temperature range is between 15°C and 85°C; prepare the oxidation solution, and weigh the nitrate and chloric acid of precious metals Dissolve the salt or sulfate solid in deionized water, keep the concentration of noble metal ions in the oxidizing solution at 0.05 mol / L~9 mol / L, stir well until the solid is completely dissolved, then add additives and protective agents to continue fully stirring and maintain a constant temperature , the constant temperature range is ...

Embodiment 1

[0028] Embodiment 1, take by weighing 5kg silver nitrate and be dissolved in 55L deionized water, treat to dissolve completely, then quantitatively add 2.8L32% sodium hydroxide in its solution, flow rate is 0.5L / minute, and reaction generates silver oxide, at this moment It acts as an oxidizing fluid. Measure 0.9 liter of 50% hydrazine hydrate, and then add 50 g of triethanolamine to its solution to prepare a reducing solution. Quantitatively pump the prepared reducing solution into the oxidizing solution, and control the flow rate at 0.15 L / min. After the reaction is complete, add an ester dispersant to the reaction solution, stir rapidly for 20 minutes, and then discharge, clean and suction filter , and finally disperse with alcohol for the second time, and then send it to an oven for drying. The drying temperature is controlled at 60°C. The dried powder is then crushed by airflow. The pressure of airflow crushing is 1.0MPa, and microcrystalline ultrafine silver powder is ...

Embodiment 2

[0029] Example 2. Weigh 5 kg of glucose and dissolve it in 57.5 L of deionized water. After it is completely dissolved, add 10 L of 30% sodium hydroxide and 5 g of copper nitrate to the solution, and control the temperature of the solution at 15° C. to prepare a reducing solution. Weigh 5 kg of silver nitrate and dissolve it in 80 L of deionized water, wait until it is completely dissolved, then add 100 g of polyvinylpyrrolidone PVP to the solution, control the temperature of the solution at 15°C, and prepare an oxidation solution. Quickly pump the prepared oxidizing solution into the reducing solution, and control the flow rate at 60L / min. After the reaction is complete, add an ester dispersant to the reaction solution, stir rapidly for 20 minutes, and then clean and filter with suction, and finally use Wash it with alcohol, drain it and send it to an oven for drying. The drying temperature is controlled at 60°C. The dried powder is then crushed by airflow, and the pressure o...

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Abstract

The invention discloses a preparation method of modified ultrafine precious metal powder. The specific steps are as follows: the first step is to prepare the reducing solution and the oxidizing solution respectively, and add auxiliary agents and protective agents; the second step is to mix the oxidizing solution and the reducing solution and fully Stir to restore the metal powder. The third step is to add a dispersant to the reaction solution for dispersion. The fourth step is to wash and filter with deionized water and dry it. The fifth step is to transfer the obtained powder to a high-speed dispersion tank. Secondary dispersion, then pumping or centrifugal dehydration and sending to an oven for drying, the sixth step is to obtain modified ultrafine precious metal powder through jet crushing and sieving. The invention introduces new additives and protective agents to control the particle size formation and growth well. Through the secondary dispersion of alcohol or acetone, during the drying process, small particles are prevented from agglomerating into large particles to form hard agglomerates. Jet milling of the body can open up some soft agglomerates. The process has the advantages of stable reaction, high efficiency and mass production.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of modified ultrafine precious metal powder. Background technique [0002] Ultrafine precious metal powder is an important field in the development of new material industry today, and has been widely used in many fields such as electronic paste industry, electronic component manufacturing, medical and antibacterial materials, electromagnetic shielding, ceramic materials, environmental protection materials and coatings. With the improvement of the precision and performance of electronic components, the requirements for ultra-fine precious metal powders are getting higher and higher, especially for the performance indicators of metal powders such as dispersibility and crystallinity. At present, in the production of ultra-fine precious metal powder, the formability and dispersion are poor, and there are a large number of hard and soft agglomerations. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/147B22F1/145
Inventor 王芳其他发明人请求不公开姓名
Owner 王芳
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