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A method for preparing hollow ceramic microspheres

A hollow ceramic and microsphere technology, applied in ceramic products, ceramic material production, clay products and other directions, can solve the problems of uneven distribution of elements, high cost, high cost of raw materials, etc., and achieve easy large-scale industrial production and reduce spraying. The effect of low temperature and raw material cost

Active Publication Date: 2020-04-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The method of remelting the ingredients is adopted, which has high energy consumption and high cost of raw materials;
[0006] 2. The raw materials added during the batching cannot be guaranteed to be fully mixed, which will lead to uneven distribution of elements, and ultimately affect the hollow structure and shape of the ball;
[0007] 3. There is a large difference in the particle size of the microbeads;
[0008] 4. The cost is high, the process is complicated, and it is not suitable for industrialization

Method used

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  • A method for preparing hollow ceramic microspheres
  • A method for preparing hollow ceramic microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) The oil shale ash is ground to 400 mesh by a ball mill;

[0025] 2) Take 196g of ground oil shale ash, add 4g of sodium nitrate, and then use a ball mill to grind and mix to obtain mixed powder I containing 2% by mass of sodium nitrate;

[0026] 3) The above-mentioned mixed powder I is sprayed out through the flame spray gun, wherein the powder feeding gas is compressed air, the pressure is 0.8MPa, the working gas is air and natural gas, the pressure is 0.1MPa, the feeding speed is 15g / min, and the melting temperature is about The temperature is 2500~3200℃, the quenching distance is 450mm, and the receiving medium is water;

[0027] 4) The spray product in 3) is separated with water, the hollow ceramic beads are collected, and dried in an oven for 3 hours to obtain hollow ceramic microspheres. The outer diameter of the obtained hollow ceramic microsphere is 12-25um, the wall thickness of the hollow microsphere is about 0.5-1um, and the hollowness is 65%.

Embodiment 2

[0029] 1) The oil shale ash is ground to 400 mesh by a ball mill;

[0030] 2) Take 192g of ground oil shale ash, add 8g of sodium nitrate, and then use a ball mill to grind and mix to obtain a mixed powder I containing 4% by mass of sodium nitrate;

[0031] 3) Spray the above mixed powder I through a flame spray gun, wherein the powder feeding gas is compressed air with a pressure of 0.8MPa, the working gas is air and natural gas, the pressure of air and natural gas is 0.2MPa, the feeding speed is 15g / min, and the spraying temperature The temperature is 2500~3200℃, the quenching distance is 450mm, and the receiving medium is water;

[0032] 4) The spray product in 3) is separated with water, the hollow ceramic beads are collected, and dried in an oven for 3 hours to obtain hollow ceramic microspheres. The outer diameter of the obtained hollow ceramic microspheres is 12-25um, the wall thickness of the hollow microspheres is about 0.5-1um, and the hollowness is 55%.

Embodiment 3

[0034] 1) The oil shale ash is ground to 400 mesh by a ball mill;

[0035] 2) Take 188g of ground oil shale ash, add 12g of sodium nitrate, and then use a ball mill to grind and mix to obtain mixed powder I containing 6% by mass of sodium nitrate;

[0036] 3) Spray the above mixed powder I through a flame spray gun, wherein the powder feeding gas is compressed air, the pressure is 0.8MPa, the working gas is air, natural gas, the pressure of air and natural gas is 0.15MPa, the feeding speed is 15g / min, and the melting temperature The temperature is 2500~3200℃, the quenching distance is 450mm, and the receiving medium is water;

[0037] 4) The spray product in 3) is separated with water, the hollow ceramic beads are collected, and dried in an oven for 3 hours to obtain hollow ceramic microspheres. The outer diameter of the obtained hollow ceramic microsphere is 6-17um, the wall thickness of the hollow microsphere is about 0.5-1um, and the hollowness is 65%.

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Abstract

The invention provides a method for preparing hollow ceramic micro-spheres. The method includes the steps: firstly, taking oil shale ash as raw material, and performing ball grinding for the raw materials by the aid of a ball grinder to prepare into oil shale ash power of 10-15 micrometers; adding sodium carbonate or sodium nitrate or mixture of the sodium carbonate and the sodium nitrate into the oil shale ash power, and performing ball grinding for the mixture to obtain mixed powder I; secondly, spraying the mixed powder I by the aid of a flame spray gun to obtain a mixture I; separating the mixture I, and collecting the hollow ceramic micro-spheres; finally, drying the hollow ceramic micro-spheres by the aid of a baking box. An accepted medium is water, and the quenching distance is 400-500mm. According to the method, the oil shale ash serves as the raw materials, batching and melting cannot be performed again, the cost of the raw materials is low, needed energy in the remelting process is reduced, and processes are simplified. The method is simple in process and high in efficiency, and large-scale industrial production is easily achieved.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metal forming, in particular to a method for preparing hollow ceramic microspheres. Background technique [0002] Hollow ceramic microspheres are a kind of hollow inorganic non-metallic spheres, which have the advantages of fine particles, hollow, light weight, high temperature resistance, corrosion resistance, etc., and have a wide range of application prospects: such as making hollow microspheres , not only can effectively reduce the density, but also use the repeated oscillation of electromagnetic waves in the cavity to increase the wave propagation path and effective absorbing thickness, thereby producing a good absorbing effect; hollow microspheres have low density, high thermal resistance, and high strength. characteristics, widely used in the building material industry, such as making various refractory bricks, building bricks, fireproof coatings, etc.; hollow microspheres are also wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B33/132C04B33/13C04B33/32
CPCC04B33/131C04B33/132C04B33/32C04B38/0645C04B38/0685C04B2235/443C04B38/009C04B38/0074Y02P40/60
Inventor 张胜全孔繁繁王胜申莹莹王鹏王准张茂林焦凤飞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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