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Method for preparing foamed ceramic

A technology of foaming ceramics and foaming agents, which is applied in the field of building material manufacturing, can solve the problems of less coal gangue utilization, limited comprehensive development, and low grade of coal gangue, and achieves reduced firing heat consumption, low raw material costs, and low energy consumption. A large amount of effect

Inactive Publication Date: 2015-04-29
GANSU WANTE TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods consume a part of coal gangue, the utilization of coal gangue is less, and some even have the problem of secondary pollution.
At the same time, the grade of coal gangue in some areas of our country is low and the content of impurities is high, which limits the comprehensive development of high value-added products using coal gangue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Take 60 parts of coal gangue, 12 parts of sandstone, 18 parts of albite, 8 parts of dolomite, and 2 parts of foaming agent as raw materials in parts by weight, and the foaming agent is mixed according to the mass ratio of manganese oxide and silicon carbide at 7:3 made;

[0022] 2) Mix the above raw materials into a ball mill, add water according to the mass ratio of raw materials to water 1:0.5, prepare slurry by wet grinding, control the particle size of the slurry below 60 μm, and spray granulate the slurry to produce get powder;

[0023] 3) Put the powder into the kiln furniture and put it into the kiln for firing. The firing temperature is 1150°C, the holding time is 2h, and the foamed ceramics are obtained after cooling.

[0024] The foamed ceramics prepared in this example have a bulk density of 250 Kg / m3, a thermal conductivity of 0.09W / (m.k) and a compressive strength of 2.2 MPa after testing and analysis.

Embodiment 2

[0026] 1) Take 70 parts of coal gangue, 6 parts of sandstone, 5 parts of albite, 11 parts of potassium feldspar, 6 parts of dolomite, and 1.8 parts of foaming agent by weight as raw materials, and the foaming agent is silicon carbide and calcium carbonate. Mixed with a mass ratio of 5:4;

[0027] 2) Mix the above raw materials into a ball mill, add water according to the mass ratio of raw materials to water 1:0.5, prepare slurry by wet grinding, control the particle size of the slurry below 60 μm, and spray granulate the slurry to produce get powder;

[0028] 3) Put the powder into the kiln furniture and put it into the kiln for firing. The firing temperature is 1180°C, the holding time is 1h, and the foamed ceramics are obtained after cooling.

[0029] After testing and analysis, the final foamed ceramics prepared in this example have a bulk density of 150 Kg / m3, a thermal conductivity of 0.05W / (m.k), and a compressive strength of 0.7MPa.

Embodiment 3

[0031] 1) Take 50 parts of coal gangue, 12 parts of sandstone, 27 parts of potassium feldspar, 7.5 parts of dolomite, and 2.5 parts of foaming agent as raw materials in parts by weight, wherein the foaming agent is based on the mass ratio of manganese oxide, silicon carbide and calcium carbonate to 5 : 2:3 mixed;

[0032] 2) Mix the above raw materials into a ball mill, add water according to the mass ratio of raw materials to water 1:0.5, prepare slurry by wet grinding, control the particle size of the slurry below 60 μm, and spray granulate the slurry to produce get powder;

[0033] 3) Put the powder into the kiln furniture and put it into the kiln for firing. The firing temperature is 1200°C, the holding time is 1.5h, and the foamed ceramics are obtained after cooling.

[0034] According to test and analysis, the bulk density of the foamed ceramics prepared in this example is 200 kg / m3, thermal conductivity: 0.075W / (m.k), and compressive strength: 1.5MPa.

[0035] The foa...

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Abstract

The invention belongs to the technical field of manufacture of building materials, and relates to a method for preparing foamed ceramic, particularly relating to a method for preparing foamed ceramic with coal gangue as the main material. The method for preparing the foamed ceramic comprises the follow steps: taking 50-70 weight parts of coal gangue, 10-25 weight parts of sandstone, 15-27 weight parts of feldspar, 0-8 weight parts of dolomite and 0.5-3 weight parts of foaming agent; (2) mixing the materials in a ball mill, grinding by adding water according to the mass ratio of the materials to the water of 1:0.5 through a wet grinding method to prepare slurry, and performing mist spraying and granulation of the slurry by controlling the size of the slurry under 60 mum to obtain a powdery material; (3) loading the powdery material into kiln furniture, firing in a kiln at the firing temperature of 1120-1220 DEG C, thermally insulating for 0.5-2.5 hours, and cooling to obtain the foamed ceramic. The foamed ceramic prepared according to the method disclosed by the invention has small volume density, low heat conductivity coefficient, large compressive strength and high fire-protection rating, and can be applied to the fields of external wall insulation of a building.

Description

technical field [0001] The invention belongs to the technical field of building material manufacturing, and relates to a method for preparing foamed ceramics, in particular to a method for preparing foamed ceramics with coal gangue as the main raw material. Background technique [0002] Coal gangue is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. It is a solid waste generated during coal production and washing and processing. One of the largest industrial solid wastes. The random stacking of a large amount of coal gangue will not only occupy the land, pollute the air, water and soil, but also cause various geological disasters, posing a major threat to human personal safety and property safety. The management and comprehensive utilization of coal gangue have been placed in a very important position at home and abroad, and a lot of research work has been done. For example, coal gangue is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/00C04B35/622
Inventor 陈美叨蒋宗祥王怀德
Owner GANSU WANTE TECH DEV
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