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Dry-method powder preparation process of foamed ceramic

A technology for foaming ceramics and dry milling, applied in the field of ceramic materials, can solve the problems of large dust, low efficiency, uneven dispersion of foaming agents, etc., and achieve the effects of concentrated pore size distribution, low production energy consumption, and high production efficiency

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]In recent years, the research on dry powder making process for ceramic materials has become a hot topic, but the current dry powder making process still has problems of low efficiency, large dust and poor dispersion effect. question
In order to solve the problem of uniformity of foaming agent dispersion, the invention patent CN111807847A "A Method for Preparing Foamed Ceramic Raw Materials Using Dry Powder Manufacturing Technology" discloses a method of dispersing a small amount of foaming agent in water, and then spraying it into the basic raw material to make The method of granulation, although this method improves the mixing and dispersing efficiency compared with direct dry mixing, the agglomeration of the powder in the granulation stage may still lead to uneven dispersion of the blowing agent, which is difficult to meet the dispersion uniformity requirements of the blowing agent

Method used

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  • Dry-method powder preparation process of foamed ceramic
  • Dry-method powder preparation process of foamed ceramic
  • Dry-method powder preparation process of foamed ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Select bauxite tailings, fly ash and feldspar as the main raw materials, use a dryer to dry the bauxite tailings with a moisture content of 10% to a moisture content of <1%, and use a Raymond mill to dry the bauxite tailings from the original state The feldspar is ground until all pass through a 100-mesh standard sieve (particle size <0.15mm), and the three processed raw materials are stored in the silo respectively.

[0037] (2) Using a belt scale, according to the ratio of bauxite tailings: fly ash: feldspar = 30%: 25%: 40%, weigh each raw material, and lay them on the belt conveyor in turn, and send them into the continuous In the dry-type ball mill, after about 40 minutes of grinding in the mill, the particle size of the milled powder reaches 45 μm and 0.5% of the sieve, and is transported to the airflow homogenization bin for storage.

[0038] (3) Lightly burned magnesia is used as a foam stabilizer, and SiC micropowder is used as a foaming agent. Two kinds of ...

Embodiment 2

[0042] (1) Choose polished brick slag and coal gangue as the main raw materials, use a dryer to dry the polished brick slag with a moisture content of 9.6% to a moisture content of <1%, and use a Raymond mill to grind the coal gangue until it passes through 100 mesh Standard sieve (particle size <0.15mm), and the processed two raw materials are stored in the raw material warehouse respectively.

[0043](2) Adopt a belt scale, according to polished brick slag: coal gangue = 70%: 24%, weigh each raw material, and spread it on the belt conveyor in turn, and send it into the continuous dry ball mill at the same time, and grind it in the mill for about 30min Finally, the particle size of the milled powder meets 0.8% of the 45μm sieve, and is transported to the airflow homogenization bin for storage.

[0044] (3) Light-burned magnesia is used as a foam stabilizer, and SiC micropowder is used as a foaming agent. Take two kinds of admixtures according to the ratio of foaming agent:foa...

Embodiment 3

[0048] (1) Select coal-fired slag, copper tailings, and chromium slag as the main raw materials, use a dryer to dry the copper tailings with a moisture content of 6.5% to a moisture content of <1%, and use a Raymond mill to dry the coal-fired slag, chromium The slag is ground separately until all of them pass through a 100-mesh standard sieve (particle size <0.15mm), and the three processed raw materials are stored in the raw material warehouse respectively.

[0049] (2) Adopt a belt scale, according to coal-fired slag: copper tailings: chrome slag=35%: 45%: 16%, take each raw material, and spread on the belt conveyor successively, send into continuous dry process ball mill simultaneously After grinding for about 45 minutes in the internal and internal mills, the particle size of the milled powder meets 45 μm sieve with 0.5% remaining, and is transported to the airflow homogenization bin for storage.

[0050] (3) Light-burned magnesia is used as a foam stabilizer, and SiC micr...

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Abstract

The invention discloses a dry-method powder preparation process of foamed ceramics, which comprises the following steps: (S1) respectively pretreating raw materials and auxiliaries of the foamed ceramics, drying the raw materials of the foamed ceramics until the water content is less than or equal to 1%, and crushing the raw materials of the foamed ceramics into fine particles with the particle size of less than or equal to 0.15 mm; mixing a foam stabilizer and a foaming agent of the foaming ceramic, and carrying out dry ball milling to obtain a foaming agent premix; (S2) carrying out dry ball milling on the pretreated raw materials, and homogenizing after the fineness reaches 45 microns and the screen residue is less than or equal to 1% to obtain main powder; (S3) mixing the main powder with the foaming agent premix, and spraying water mist for granulation after mixing, so that powder particles are agglomerated to form spherical particle powder; and (S4) homogenizing the moisture of the spherical particle powder to obtain dry powder of the foamed ceramic. The dry-method powder preparation process is high in production efficiency, low in production energy consumption and uniform in foaming agent dispersion.

Description

technical field [0001] The invention relates to a dry powder-making process of foamed ceramics, which belongs to the technical field of ceramic materials. Background technique [0002] Foamed ceramics is a closed-cell ceramic material with high porosity, which is made of aluminum-silicon minerals or industrial solid waste as the main raw material, plus a certain foaming agent, mixed into powder, and fired at high temperature. The material has the characteristics of small bulk density, low thermal conductivity, fire retardant, anti-aging, stable performance, good ecological environmental protection, good compatibility with wall base and plastering layer, and can last the same life as the building. It is a new type of inorganic Wall insulation. In recent years, my country has vigorously promoted the production and application of foamed ceramic thermal insulation wall materials, and has built production lines with a scale of about 1 million cubic meters in Jiangsu, Henan, Liao...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B38/02C04B33/132C04B35/18C04B35/622
CPCC04B35/62695C04B35/18C04B35/622C04B38/02C04B35/62204C04B33/1328C04B2235/3217C04B2235/3206C04B2235/3826Y02P40/60
Inventor 周明凯陈潇王怀德林方亮
Owner WUHAN UNIV OF TECH
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