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Production process and production device of ultrafine boron carbide micropowder

A production process and production device technology, which is applied in the production process and production device field of ultra-fine boron carbide powder, can solve the problems that the boron carbide powder is not fine enough, the loss of the material to be ground is increased, and the energy consumption is high, and achieves good fluidity and dust. Low yield, high purity effect

Pending Publication Date: 2018-06-01
山东埃尔派粉体科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although jet milling can produce ultrafine powder with less impurities; however, it is difficult to obtain a large amount of ultrafine powder in one jet milling, and it takes 5-6 times of repeated pulverization to meet the particle size requirement.
Jet milling requires a large number of dust collection devices. The more times of milling repetitions, the higher the energy consumption and the sharp increase in the loss of the material to be ground.
[0005] The process that can really enter the industrial production scale is the preparation of superfine powder by ordinary wet ball milling. It has the advantages of low cost and large output, but there are disadvantages such as high impurity content and the obtained boron carbide powder is not fine enough.

Method used

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  • Production process and production device of ultrafine boron carbide micropowder
  • Production process and production device of ultrafine boron carbide micropowder

Examples

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Effect test

Embodiment 1

[0031] A production process of ultra-fine boron carbide micropowder, comprising the following steps:

[0032] (1) Pulverization: Take 200kg of boron carbide particles (D50=20μm), 300kg of grinding media and 300kg of water, put them into a wet grinder, the speed of the wet grinder is 500r / min, and the pump flow rate is 3-5 liters / hour , grinding at 40°C for 40 hours until the ground slurry D50<0.5 μm, wherein the boron carbide particle size is less than or equal to 20 μm, wherein the content of iron element and compound is less than 0.2wt%, and the content of aluminum element and compound is less than 0.1wt%, silicon element and compound content is less than 0.25wt%;

[0033] (2) Purification: pump the ground slurry into a reaction tank, add 25 kg of hydrofluoric acid, heat to 80° C., keep warm for 5 hours, stir for 10 minutes per hour, continue to react for 20 hours, and rinse with water until ph=5 -6, add 1 kg of hydrochloric acid and 5 kg of nitric acid, heat to 80°C, keep ...

Embodiment 2

[0040] A production process of ultra-fine boron carbide micropowder, comprising the following steps:

[0041] (1) Pulverization: Take 200kg of boron carbide particles (D50=20μm), 300kg of grinding media and 400kg of water, put them into a wet grinder, the speed of the wet grinder is 650r / min, and the pump flow rate is 3-5 liters / hour , ground at 45°C for 38 hours until the ground slurry D50<0.5 μm, wherein the particle size of the boron carbide particles is less than or equal to 20 μm, the content of iron element and compound is less than 0.2wt%, and the content of aluminum element and compound is less than 0.1wt%, silicon element and compound content is less than 0.25wt%;

[0042] (2) Purification: pump the ground slurry into a reaction tank, add 28 kg of hydrofluoric acid, heat to 80° C., keep warm for 5 hours, stir for 10 minutes per hour, continue to react for 20 hours, and rinse with water until ph=5 -6, then add 1.1kg of hydrochloric acid and 5.5kg of nitric acid, heat ...

Embodiment 3

[0049] A production process of ultra-fine boron carbide micropowder, comprising the following steps:

[0050] (1) Pulverization: Take 200kg of boron carbide particles (D50=20μm), 300kg of grinding media and 400kg of water, put them into a wet grinder, the speed of the wet grinder is 800r / min, and the pump flow rate is 3-5 liters / hour , ground at 50°C for 35 hours, until the ground slurry D50<0.5μm, wherein the boron carbide particle size is less than or equal to 20μm, wherein the content of iron element and compound is less than 0.2wt%, and the content of aluminum element and compound is less than 0.1wt%, silicon element and compound content is less than 0.25wt%;

[0051] (2) Purification: pump the ground slurry into a reaction tank, add 30 kg of hydrofluoric acid, heat to 80° C., keep warm for 5 hours, stir for 10 minutes per hour, continue to react for 20 hours, and rinse with water until ph=5 -6, add 1 kg of hydrochloric acid and 5 kg of nitric acid, heat to 80°C, keep war...

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Abstract

Belonging to the technical field of boron carbide grinding, the invention in particular relates to a production process and production device of ultrafine boron carbide micropowder. The method includes the steps of: (1) crushing; (2) purification; (3) filter pressing; (4) drying; (5) dispersion; (6) grading; and (7) packaging. The production device includes a wet grinding machine, a first slurry pump, a slurry finished product tank, a second slurry pump, a slurry purification reaction tank, a filter press, a drying separation device and a vacuum packer that are communicated in order. Accordingto the invention, the process is simple, the production device is reasonable in design and easy to operate, the product cost is low, the dust production is small, the energy consumption is low, and the obtained boron carbide micropowder has high purity, finer grain size, a particle size of less than 0.5microm, large specific surface area, good fluidity, high stability and high sintering activity.

Description

technical field [0001] The invention belongs to the technical field of boron carbide grinding, and in particular relates to a production process and a production device of ultrafine boron carbide powder. Background technique [0002] Boron carbide is an important superhard material whose hardness is second only to diamond and cubic boron nitride in nature. Boron carbide ultrafine powder has many excellent characteristics and has great practical application value in high-tech fields. Boron carbide superfine powder has physical and chemical characteristics such as large specific surface area, high chemical activity, strong reaction ability, low melting point and sintering temperature. It is used in fine ceramics, powder metallurgy, high-end liquid and gas sealing materials, aerospace engine nozzles, high-end ceramic bearings It plays an important role in the manufacture of high-end bulletproof armor materials, polishing and fine abrasives for hard materials, electronic technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991B02C17/20
CPCB02C17/20
Inventor 李现欣李友胜
Owner 山东埃尔派粉体科技股份有限公司
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