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Preparation method of silicon-aluminium ceramic hollow microbeads

A technology of ceramic hollow microspheres and silicon aluminum, which is applied in the direction of ceramic products, applications, household appliances, etc., and can solve the problems of low yield, inability to obtain micron-sized particles, and inability to achieve coating.

Inactive Publication Date: 2017-11-28
张晓武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from common sense, the coating process can only be solid-phase coating, because the density of polystyrene is significantly smaller than that of ceramics and titanium dioxide powder, and coating in the liquid phase state cannot be achieved
However, for solid phase coating, it is obviously impossible to obtain micron-sized particles, or the yield is extremely small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Prepare nano calcium carbonate dispersion slurry. Limestone with CaO content greater than 54% (CaCO 2 ) Calcined to obtain quicklime (CaO) and carbon dioxide, and recover carbon dioxide gas. Digest quicklime with water to obtain slaked lime [Ca(OH) 2 ] The liquid is aged and clarified, the supernatant is absorbed, and the recovered carbon dioxide gas is carbonized at a constant temperature of 15±5°C to produce spherical nano-calcium carbonate with the original particle size of 10-15nm. Adjust the concentration and mass concentration of the dispersed slurry with water Is 2%.

[0019] (2) Prepare aluminum sulfate solution. An aqueous solution with a mass concentration of 5% is prepared by using first-grade octadecahydrate aluminum sulfate with an alumina content of not less than 15.8%.

[0020] (3) Prepare sodium silicate solution. The solid sodium silicate with a modulus of 3.3 to 3.4 and a sodium silicate content of not less than 98% is hydrothermally dissolved to pre...

Embodiment 2

[0024] (1) Prepare nano calcium carbonate dispersion slurry. Limestone with CaO content greater than 54% (CaCO 2 ) Calcined to obtain quicklime (CaO) and carbon dioxide, and recover carbon dioxide gas. Digest quicklime with water to obtain slaked lime [Ca(OH) 2 ] The liquid is aged and clarified, the supernatant is absorbed, and the recovered carbon dioxide gas is carbonized at a constant temperature of 25±5°C to produce spherical nano-calcium carbonate with the original particle size of 15-30nm. Adjust the concentration and mass concentration of the dispersed slurry with water Is 2%.

[0025] (2) Prepare aluminum sulfate solution. An aqueous solution with a mass concentration of 5% is prepared by using first-grade octadecahydrate aluminum sulfate with an alumina content of not less than 15.8%.

[0026] (3) Prepare sodium silicate solution. The solid sodium silicate with a modulus of 3.3 to 3.4 and a sodium silicate content of not less than 98% is hydrothermally dissolved to pre...

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Abstract

The invention provides a method for preparing silicon-aluminum ceramic hollow microspheres. Prepare nano-calcium carbonate dispersion liquid, aluminum sulfate solution and sodium silicate solution first, then mix the three liquids, and the nano-aluminum silicate produced by the reaction is coated on the nano-calcium carbonate to form silicon-aluminum solid particles. The particles are washed, dried, calcined, water-selected and dried to obtain alumina content greater than 25%, particle size 5-150um, true density 0.15-0.95g / cm3, compressive strength 15-100MPa, and whiteness over 88%. Silica-alumina ceramic hollow microspheres.

Description

Technical field [0001] The invention relates to a preparation method of silicon-aluminum ceramic hollow microspheres, belonging to the field of new inorganic powder materials, in particular to the alumina content greater than 25%, particle size less than 150um, and true density less than 0.95g / cm 3 Method for preparing silicon-aluminum ceramic hollow microspheres. Background technique [0002] Hollow glass beads and hollow ceramic beads have the characteristics of high strength, high temperature resistance, corrosion resistance, radiation protection, fine particle size, light weight, round appearance, good insulation, sound insulation, and stable chemical properties. It is used in light-weight composite materials, thermal insulation materials, low-density cement, functional rubber and plastic materials and other fields. It is a new type of powder material developed in the 1970s. Early products were mainly bleached and selected from coal ash from thermal power plants, but their ap...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/18
CPCC04B38/009C04B35/18C04B2235/95C04B2235/96C04B38/02C04B38/0067
Inventor 张晓武
Owner 张晓武