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Calcium hexaluminate lightweight refractory brick and preparation method thereof

A technology of calcium hexaaluminate and refractory bricks, which is applied in the field of refractory materials and can solve the problems of short service life, large heat storage and high price

Inactive Publication Date: 2010-12-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the low strength of the refractory fiber products used in the furnace lining, the poor erosion and wear performance of high-temperature gas-solid two-phase flow (high-temperature flue gas and high-temperature flue gas / solid combustion particles), and the existing problems in the process of production and use. Carcinogenic risk, high price, ordinary aluminum silicate lightweight refractory bricks, high alumina lightweight refractory bricks and alumina hollow ball refractory bricks have high density, high thermal conductivity, large heat storage, and thermal shock resistance Poor, short service life, poor energy-saving effect during use, etc., using the low thermal conductivity of calcium hexaaluminate, good stability in high-temperature reducing atmosphere, good resistance to alkali erosion and slag erosion, long life According to the characteristics of the calcium hexaaluminate lightweight refractory brick and its preparation method, to achieve the purpose of preparing high-efficiency energy-saving, long-life high-temperature industrial kiln lining lightweight refractory bricks, so as to make a contribution to the energy saving of high-temperature industries contribute

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A preparation process of calcium hexaaluminate lightweight refractory bricks is as follows:

[0015] Raw materials → batching → dry ball milling → adding pore forming agent → stirring → forming → drying → firing → processing → inspection

Embodiment 1

[0017] Raw materials and ratio:

[0018] Calcium carbonate (requires CaCO 3 ≥98.0%) is calcium source, aluminum hydroxide (requires Al(OH) 3 ≥99.0%) is the aluminum source, and the particle size of the raw material is less than 0.15mm.

[0019] Ingredients, Grind:

[0020]First, various raw materials are loaded into a mill according to the theoretical ratio of calcium hexaaluminate and ground until the sieve residue of a sieve with an aperture of less than 0.060 mm is less than 3.0 wt.%.

[0021] Add pore forming agent and stir to form:

[0022] Add polystyrene balls accounting for 8.0% of the total batching, 4.0% wood chips and sawdust (requiring its particle diameter≤3.0mm) of the total batching, stir and mix the ball milled mixture with polystyrene balls and wood chips and sawdust for 10 minutes, then Add 6% potable water and stir for 5 minutes, and the mud material obtained is molded by pressurized vibration casting.

[0023] dry:

[0024] The formed wet body is natu...

Embodiment 2

[0032] Raw materials and ratio:

[0033] With calcium oxide (required CaO≥98.0%) as calcium source, γ-Al 2 o 3 (Requires Al 2 o 3 ≥99.0%) is the aluminum source, and the particle size of the raw material is less than 0.15mm.

[0034] Ingredients, Grind:

[0035] Firstly, various raw materials are loaded into a ball mill according to the theoretical ratio of calcium hexaaluminate and ball milled for 12 hours, and the raw materials are ground until the sieve residue of a sieve with an aperture of less than 0.060 mm is less than 3.0 wt.%.

[0036] Add pore forming agent and stir to form:

[0037] Add 6% coke powder and 8% polystyrene balls (requiring its particle size ≤ 3.0mm) of the total ingredients, stir and mix the ball-milled mixture with polystyrene balls for 10 minutes, then add 6% polystyrene balls Drinking water was stirred for 5 minutes, and the mud obtained was cast into shape by pressurized vibration.

[0038] dry:

[0039] The formed wet body is naturally dri...

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Abstract

The invention relates to a calcium hexaluminate lightweight refractory brick, in particular to a high-quality refractory material with low heat conduction coefficient, good stability under high-temperature reducing atmosphere, good alkali resistance and slag erosion resistance and long service life for a high-temperature kiln lining, and belongs to the technical field of refractory materials. Calcium hexaluminate is used as a main crystal phase, and the sum of the main chemical components Al2O3 and CaO of the calcium hexaluminate is more than 90 weight percent. Calcium carbonate, calcium hydroxide, calcium oxide, limestone or lime or the like is used as a calcium source; and aluminum oxide, aluminum hydroxide or the like is used as an aluminum source. The calcium hexaluminate lightweight refractory brick is prepared by a series processes of mixing the materials uniformly according to the theory of the calcium hexaluminate, grinding the mixture, adding a certain amount of pore forming agent into the mixture and stirring the mixture uniformly, then performing half dry vibration casting, wet adjusting controllable drying, high-temperature air introducing pore formation, one-step reductive reaction sintering, cutting and processing and the like. The lightweight refractory brick for the high-temperature kiln lining has low heat conduction coefficient and long service life, and can provide efficient and energy-saving guarantee for industrial furnace equipment.

Description

Technical field: [0001] The invention relates to a calcium hexaaluminate lightweight refractory brick and a preparation method thereof, belonging to the field of refractory materials. Background technique: [0002] my country's economy is developing rapidly, but the development of energy production is much lagging behind. Another way to solve the energy shortage is to save energy, that is, to reduce heat loss, improve the utilization efficiency of heat energy, and reduce energy waste. Internationally, energy-saving projects are regarded as the "fifth energy source", and its significance is very important. Therefore, vigorously developing the thermal insulation material industry and widely adopting high-quality thermal insulation materials have important practical significance for the healthy and stable development of my country's economic construction. [0003] Heat storage and heat dissipation losses of thermal insulation materials used in industrial kiln linings generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622C04B35/66
Inventor 曾春燕易帅黄朝晖房明浩刘艳改
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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