Method for preparing glassy single cavity hollow particles using perlite tailings

By using a vertical roasting furnace and specific processing techniques to prepare glassy single-cavity hollow particles, the problems of furnace blockage and particle quality during the roasting of perlite tailings were solved, realizing resource reuse and material performance improvement.

CN117720280BActive Publication Date: 2026-03-20李朕
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Patent Information

Application Number
CN202311508305.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-13
Publication Date
2026-03-20
Estimated Expiration
2043-11-13

AI Technical Summary

Technical Problem

In the existing technology, perlite tailings with a particle size of less than 200 mesh are prone to sticking to the side wall of the heating furnace during the roasting process, causing furnace blockage. At the same time, the vitrified microspheres prepared have poor sphericity and low strength.

Method used

Perlite tailings smaller than 300 mesh were roasted in a vertical roasting furnace. By mixing perlite with perlite tailings and adding triethanolamine for depolymerization, combined with high-intensity fluidized gas drying and ultra-fine atomized silica sol treatment, perlite micro powder particles coated with neutral silica sol were prepared. Finally, they were roasted in a vertical roasting furnace to form glassy single-cavity hollow particles.

Benefits of technology

The preparation of glassy single-cavity hollow particles with good roundness and high strength avoids resource waste and environmental pollution. These particles can be used to prepare lightweight aggregate thermal insulation refractory materials and composite materials, and prevent furnace blockage caused by agglomeration during the calcination process.

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Abstract

The application provides a method for preparing glassy single-cavity hollow particles by using perlite tailings, which can process the perlite tailings with a particle size less than 300 mesh into glassy single-cavity hollow particles with good roundness and high strength, so that the glassy single-cavity hollow particles can be used to make light aggregate thermal refractory materials, composite materials and filling materials of various engineering materials, etc., so that the waste resource of the perlite tailings with a particle size less than 300 mesh can be recycled, so as to avoid resource waste and ecological environment destruction. Moreover, the method for preparing glassy single-cavity hollow particles by using perlite tailings in the embodiment of the application adopts vertical roasting furnace bottom feeding, and realizes disaggregation and agglomeration of particles by adding triethanolamine, so that the perlite micro-powder raw material has good fluidity and dispersity, the agglomeration of the perlite micro-powder raw material with a particle size less than 300 mesh in the roasting process can be effectively prevented, and the perlite micro-powder raw material is prevented from being bonded on the side wall of the hearth to cause the hearth blockage.
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