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Light-weight closed-pore ceramic heat insulating board

A thermal insulation board and closed-cell technology, which is applied in the production and application of ceramic products and ceramic materials, can solve the problems of high sintering temperature, long holding time, and difficulty in production. processing effect

Inactive Publication Date: 2012-12-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"In this invention, the sintering temperature is high (1300°C~1450°C), the holding time is long (10~16h), the energy consumption is large, and calcium fluoride, which is easy to corrode equipment, is used as raw material, which is not easy to produce

Method used

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  • Light-weight closed-pore ceramic heat insulating board
  • Light-weight closed-pore ceramic heat insulating board
  • Light-weight closed-pore ceramic heat insulating board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The lightweight closed-cell ceramic insulation board is composed of the following raw materials: 25% phosphorous tailings, 17% silt, 25% feldspar, 10% shale, 9% kaolin, 12% yellow sand and 2% foaming agent, all in mass percentage The foaming agent is a mixture of silicon carbide, calcium carbonate and iron oxide, the particle size is ≤0.045mm, and the mass percentage is: silicon carbide 50%, calcium carbonate 28%, iron oxide 22%.

[0023] The light-weight closed-cell ceramic insulation board obtained by measuring the density by the Archimedes drainage method, the compressive strength by the rebound method, and the thermal conductivity by the flat-plate method has a density of 0.282g / cm 3 , the compressive strength is 12.26MPa, and the thermal conductivity is 0.089W / (m·K).

Embodiment 2

[0025] The lightweight closed-cell ceramic insulation board is composed of the following raw materials: 35% phosphorous tailings, 13% silt, 20% feldspar, 9.5% shale, 6% kaolin, 15% yellow sand, and 1.5% foaming agent, all of which are mass Percentage; foaming agent is a mixture of silicon carbide, calcium carbonate and iron oxide, particle size ≤ 0.045mm, mass percentage: silicon carbide 54%, calcium carbonate 26%, iron oxide 20%.

[0026] Test method is the same as embodiment 1, and the density of gained porous insulation board is 0.273g / cm 3 , The compressive strength is 11.60MPa, and the thermal conductivity is 0.076W / (m·K).

Embodiment 3

[0028] The lightweight closed-cell ceramic insulation board is composed of the following raw materials: 20% phosphorous tailings, 24% silt, 26% feldspar, 9% shale, 7.5% kaolin, 11% yellow sand, and 2.5% foaming agent, all in mass percentage The foaming agent is a mixture of silicon carbide, calcium carbonate and iron oxide, the particle size is ≤0.045mm, and the mass percentage is: silicon carbide 60%, calcium carbonate 25%, iron oxide 15%.

[0029] Test method is the same as embodiment 1, and the density of gained porous insulation board is 0.291g / cm 3 , the compressive strength is 13.07MPa, and the thermal conductivity is 0.095W / (m·K).

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Abstract

The invention relates to a light-weight closed-pore ceramic heat insulating board, which is prepared by using the following main raw materials in percent by weight: 20-50 percent of phosphate tailing, 10-24 percent of sludge, 20-30 percent of feldspar, 4-15 percent of shale, 3-15 percent of kaolin, 10-20 percent of yellow sand and 1-2.5 percent of foaming agent, wherein the foaming agent is mixture of silicon carbide, calcium carbonate and ferric oxide, the grain size of the mixture is less than or equal to 0.045mm, and the weight percents of silicon carbide, calcium carbonate and ferric oxide are respectively 40-60 percent, 25-45 percent and 15-35 percent. The light-weight closed-pore ceramic heat insulating board has great importance on efficiently utilizing the phosphate tailing and reducing environmental pollution caused by industrial solid wastes so as to improve the natural environment, use cheap raw materials and decrease the production cost; and at the same time, the produced light-weight closed-pore ceramic heat insulating board has the advantages of higher porosity, higher strength and lower sintering temperature.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and in particular relates to a lightweight closed-cell ceramic insulation board. Background technique [0002] my country is quite rich in phosphate rock resources, the reserves are second only to Morocco, ranking second in the world. The eight major phosphate rocks are mainly distributed in Hubei, Hunan, Sichuan, Jiangsu, Guizhou, Yunnan and other provinces, but 80% of them are medium and low-grade phosphate rocks. Phosphorus tailings are unutilized solid waste discharged from phosphate ore flotation concentrates. In recent years, with the rapid development of the phosphating industry and the low grade of raw phosphate rock in my country, the phosphating industry produces a large amount of phosphate tailings every year. Phosphorus tailings are generally in the form of fine sand and naturally piled up in tailings ponds, which not only consumes money and takes up a lot of land, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B33/132
CPCY02P40/60
Inventor 吉晓莉陈卓
Owner WUHAN UNIV OF TECH
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