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Method for preparing micro-fine spherical Mn3O4 powder by using MnCO3 as raw material

A powder and fine technology, applied in the direction of manganese oxide/manganese hydroxide, etc., to achieve the effect of fine particle size, high sphericity, and shortened process flow

Inactive Publication Date: 2014-05-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] MnCO 3 As raw materials, the application of the above-mentioned inductively coupled plasma technique to prepare fine spherical Mn 3 o 4 The powder method has not been reported yet.

Method used

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  • Method for preparing micro-fine spherical Mn3O4 powder by using MnCO3 as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fine spherical Mn with an average particle size of 5 μm 3 o 4 Powder preparation:

[0026] Relying on inductively coupled plasma technology to establish a stable Ar-O 2 Inductively coupled plasma power is 60KW, plasma working gas (Ar) flow is 35slpm, side gas flow is 200slpm (Ar)r+20slpm (O 2 ), MnCO with an average particle size of 50 μm was mixed with argon at a flow rate of 5 slpm 3 The powder is axially fed into the high temperature plasma, the powder feeding rate is 15g / min, MnCO 3 After the particles go through a series of processes of thermal decomposition, crushing, melting spheroidization and condensation into spheres in the plasma high temperature area, they can receive fine spherical Mn particles with an average particle size of 5 μm. 3 o 4 pink.

Embodiment 2

[0028] Fine spherical Mn with an average particle size of 15 μm 3 o 4 Powder preparation:

[0029] Relying on inductively coupled plasma technology to establish a stable Ar-O 2 The inductively coupled plasma power is 60KW, the plasma working gas (Ar) flow rate is 45slpm, and the edge gas flow rate is 250slpm (Ar)r+25slpm (O 2 ), MnCO with an average particle size of 100 μm 3 The powder is axially fed into the high temperature plasma, the powder feeding rate is 20g / min, MnCO 3 After the particles go through a series of processes of thermal decomposition, crushing, melting spheroidization and condensation into spheres in the plasma high temperature area, they can receive fine spherical Mn particles with an average particle size of 15 μm. 3 o 4 pink.

Embodiment 3

[0031] Fine spherical Mn with an average particle size of 20 μm 3 o 4 Powder preparation:

[0032] Relying on inductively coupled plasma technology to establish a stable Ar-O 2 The inductively coupled plasma power is 60KW, the plasma working gas (Ar) flow rate is 50slpm, and the edge gas flow rate is 260slpm (Ar)r+26slpm (O 2 ), MnCO with an average particle size of 150 μm 3 The powder is axially fed into the high temperature plasma, the powder feeding rate is 35g / min, MnCO 3 After the particles go through a series of processes of thermal decomposition, crushing, melting spheroidization and condensation into spheres in the plasma high temperature area, they can receive fine spherical Mn particles with an average particle size of 20 μm. 3 o 4 pink.

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Abstract

The invention provides a method for preparing micro-fine spherical Mn3O4 powder by using MnCO3 as a raw material, and belongs to the technical field of powder preparation. The method is characterized in that after a stable operation Ar-O2 plasma torch is established by using Ar as plasma working gas and Ar-O2 as side gas based on an inductive coupling plasma technology, large granular MnCO3 powder is axially fed into high-temperature plasma by using argon as carrier gas, and then absorbs heat and rapidly decomposes, so that lots of CO2 is instantly released and enables large particles to be split and crushed, and fusion and shock cooling are further completed, thus the micro-fine spherical Mn3O4 powder is formed. The method is high in production efficiency, energy-saving and low in production cost. The prepared micro-fine spherical Mn3O4 powder is small and uniform in powder size, good in mobility, high in degree of sphericity and high in purity.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular provides a fine spherical Mn 3 o 4 Method of powder preparation. technical background [0002] Trimanganese tetraoxide is a high-performance structural material, mainly used in the electronics industry. In recent years, with the rapid development of the electronics industry, high-quality Mn 3 o 4 demand is increasing. Among them, spherical trimanganese tetroxide has the advantages of good fluidity, high filling capacity and large specific surface area, and is widely used in various industries, such as manganese additives for molten pig iron pretreatment, battery materials, and can also be used as Manganese ferrite materials, agricultural fertilizers, glass colorants, rubber fillers, enamel and welding rod fluxes, etc., especially used as a weighting agent in oil well cement, can obtain high-density cement slurry. At present, this spherical Mn 3 o 4 It is also m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 郝俊杰王建军郭志猛罗骥邵慧萍王松毛瑞奇
Owner UNIV OF SCI & TECH BEIJING
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