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Method for preparing lightweight magnesium-aluminum spinel raw material

A technology of aluminum spinel and light magnesium is applied in the field of refractory material production, which can solve the problems of unsuitable heat insulation refractory material and insufficient porosity, and achieve the effects of low thermal conductivity, high porosity and low bulk density.

Inactive Publication Date: 2008-07-09
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porosity of this raw material is not high enough, so it is not suitable to be used as the main raw material to prepare heat-insulating refractories with good heat-insulating effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0019] Table 1 lists the examples 1 to 3 and the comparison scheme all adopt γ-Al 2 O 3 Fine powder and fine magnesite powder are raw materials, and the particle size of the two raw materials is less than 44μm. The mass ratios of alumina and magnesia of the ingredients in Examples 1 to 3 are 2.7, 3.0, 4.0, respectively, and the mass ratio of alumina to magnesia in the comparative scheme is 2.4 (the composition of the prepared magnesia-aluminum spinel raw material is rich in magnesia Spar). Add 3% dextrin to the ingredients. 15% water is added during mixing. The forming pressure of the green body is 80Mpa. The shaped and baked blanks are calcined in a gas kiln with a calcining temperature of 1730°C and a holding time of 4 hours.

[0020] The performance indexes of the light magnesia-aluminum spinel raw materials of Examples 1 to 3 are shown in Table 2 below. The performance of the light raw materials listed in Table 2 shows that compared with the comparison scheme, the light magnes...

Embodiment 4～5

[0026] The schemes of Examples 4 to 5 all use γ-Al 2 O 3 Fine powder and fine magnesite powder are raw materials, and the particle size of the two raw materials is less than 44μm. The raw material ratios of the schemes of Examples 4 to 5 and the performance indexes of the prepared light magnesia-aluminum spinel raw materials are shown in Table 3 and Table 4.

Embodiment 4

[0027] In Example 4, the mass ratio of alumina and magnesia was controlled to be 2.7 during the batching, and 2% of pulp powder was added to the batching. 12% water is added during mixing. The forming pressure of the green body is 65Mpa. The shaped and baked blanks are calcined in a small gas kiln with a calcining temperature of 1650°C and a holding time of 2 hours. The prepared light magnesia-aluminum spinel raw material has an average porosity of 61% and a bulk density of 1.47g / cm 3 .

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Abstract

The invention provides a process for preparing lightweight magnesia-alumina spinel brick raw material, belonging to the production technique of fireproof materials. The process employs Gamma-Al2O3 fine powder and magnesite fine powder as main raw materials, the two are formulated according to the mass ratio of aluminum oxide and magnesium oxide of 2.7-4.0, and organic bond and water are additionally added to uniformly mix. By employing semidry process to mold, green bodies after being baked are calcined at a temperature of 1650-1800DEG C and then heat-insulated for 2-4 hours. The lightweight magnesia-alumina spinel brick raw material provided by the invention can be used for preparing heat-proof fireproof products and heat-proof amorphous fire-proof materials of magnesia-alumina spinel brick. Compared with the heat-proof corundum bricks, the heat-proof bricks prepared by employing lightweight magnesia-alumina spinel brick raw material have lower heat conductivity.

Description

Technical field [0001] The invention belongs to the production technology of refractory materials, and mainly proposes a method for preparing light magnesia-aluminum spinel raw materials. Background technique [0002] Thermal insulation refractories refer to refractories with high porosity, low bulk density and low thermal conductivity. Insulating refractories are widely used in industrial high-temperature kiln equipment to meet the technological requirements of high-temperature kiln equipment and reduce the energy consumption of high-temperature kiln equipment. Due to the different types and requirements of high-temperature kiln equipment, the types of insulation refractories required are also different, such as insulation refractories of different materials and different temperatures. The lightweight raw materials used to prepare thermal insulation refractories usually include expanded perlite, expanded vermiculite, diatomaceous earth, light clay raw materials, light high-alumi...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/622
Inventor 石干裴春秋
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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