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Method and device for preparing flaky metal powder by means of dry ball mill

A flake metal and ball milling technology, which is applied in the field of electronic materials, can solve the problems of production equipment that cannot be enlarged, poor powder dispersion, and low production efficiency, and achieve good sealing and cooling effects, improved production efficiency, and no dust pollution.

Active Publication Date: 2015-12-23
SHENZHEN NONFEMET TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high speed, some cold welding will occur during the ball milling process, and the produced powder (such as flake zinc powder and flake aluminum powder) has poor dispersion and low uniformity, which cannot meet the requirements of high-grade flake zinc powder and flake aluminum powder. powder request
In addition, due to the limitation of sealing technology, the production equipment cannot be enlarged. The maximum volume of the ball mill is 100L, and only a dozen kilograms of metal powder can be ball-milled at a time. The output is low, resulting in low production efficiency.

Method used

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  • Method and device for preparing flaky metal powder by means of dry ball mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put the mixed material containing 600 kg of zinc powder raw materials, 18 kg of ball milling aids and 2400 kg of 6mm, 3000 kg of 9.5mm, and 600 kg of 12mm steel balls into the 5M 3 In the new roller ball mill, through the atmosphere control system, the mixed atmosphere in which the proportion of nitrogen in the ball mill cylinder is controlled is 90% to 95%, and the ball is milled under airtight conditions, the ball milling speed is 34rpm, the ball milling time is 8 hours, and the ball milling temperature is 25°C. The zinc powder after ball milling enters the closed discharge system, the nitrogen pressure in the cylinder is 0.02MPa, the fan operation frequency is 40Hz, the ball mill speed is 32rpm, and the powder discharge time is 8min. After dispersing by dispersing equipment and grading by airflow, a flake zinc powder product with an average particle size of 13.24 μm, a bulk density of 1.04 g / mL and a sieving rate (-325 mesh) of 98% was obtained.

Embodiment 2

[0041] Put the mixture containing 500 kg of aluminum powder raw materials, 8 kg of ball milling aids and 2000 kg of 6mm, 2500 kg of 9mm, and 500 kg of 12mm steel balls into the 5M 3In the new roller ball mill, the atmosphere control system is used to control the mixed atmosphere with a nitrogen ratio of 95% to 98% in the cylinder, and the ball is milled under airtight conditions. The ball milling speed is 32rpm, the ball milling time is 10 hours, and the ball milling temperature is 20°C. The aluminum powder after ball milling enters the closed discharge system, the nitrogen pressure in the cylinder is 0.01MPa, the fan operation frequency is 40Hz, the ball mill speed is 30rpm, and the powder discharge time is 6min. After dispersing by dispersing equipment and grading by air flow, a flake aluminum powder product with an average particle size of 16.35 μm, a bulk density of 0.32 g / L, and a sieving rate (-325 mesh) of 99% was obtained.

Embodiment 3

[0043] Put the mixture containing 600 kg of atomized zinc powder, 9 kg of ball milling aids and 2500 kg of 6mm, 3000 kg of 9mm, and 500 kg of 12mm mixed steel balls into the 5M3 new roller ball mill, and control the nitrogen in the cylinder through the atmosphere control system A mixed atmosphere with a ratio of 97% to 98% is ball milled under airtight conditions with a ball milling speed of 30 rpm, a ball milling time of 8 hours, and a ball milling temperature of 20°C. The zinc powder after ball milling enters the closed discharge system, the nitrogen pressure in the cylinder is 0.02MPa, the fan operation frequency is 42Hz, the ball mill speed is 30rpm, and the powder discharge time is 10min. After dispersing by dispersing equipment and grading by air flow, a flake zinc powder product with an average particle size of 18.60 μm, a bulk density of 0.9 g / L, and a sieving rate (-325 mesh) of 96% was obtained.

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Abstract

The invention provides a method for preparing flaky metal powder by means of a dry ball mill. The method comprises the steps that metal raw material powder and ball milling additives are evenly mixed, a mixture and a steel ball are put in a closed novel roller ball mill for ball milling in proportion, the ball milling temperature is controlled through a cooling water circulation system in the ball milling process, and the ball milling atmosphere in a roller is adjusted through a ball milling atmosphere control system; a closed discharging system is adopted for discharging, inert gas of certain pressure is input, an exhaust fan and the ball mill are started, and ground metal powder in the ball mill is blown and sucked out in a blowing and sucking manner; and the metal powder is put in dispersion equipment again to be dispersed, and is graded by airflow grading equipment to obtain finished products. The invention relates to a device for achieving the method. According to the method, the whole process is high in automation degree, no steel ball transfer exists, and the labor intensity and workloads of workers are greatly reduced. In addition, the sealing performance and the cooling effect are good, no dust pollution exists, the phenomena of powder oxidation and spontaneous combustion in the powder discharging process are avoided, the yield is large, and production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a method and a device for preparing flake metal powder by dry ball milling. Background technique [0002] At present, there are two main methods for preparing scaly metal powders by ball milling: wet method and dry method. [0003] The patent application number is CN01103176.X discloses a production process of scaly metal powder, which is a wet process, which consists of grinding, sorting, filtering, drying, secondary drying and other processes. The raw material zinc powder is mixed with solvent, surface The coating agent is put into the ball mill for ball milling in proportion. After the ball milling, the slurry enters the storage tank for mixing. In the tank, the grinding medium is separated, and the filtered paste raw material is put into the bucket to stand still, and the solvent on the surface is sucked away. The obtained paste material is dried an...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 林兴铭李清湘邱刚陈云鹏师平乐刚周少强刘银向红印万良标程玉才
Owner SHENZHEN NONFEMET TECH
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