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CaO-MgO-SiO2 series foamed ceramic taking asbestos tailings as raw material

A technology of foam ceramics and asbestos tailings, applied in ceramic products, applications, household appliances, etc., can solve the problem of lower mechanical properties of samples, difficulty in preparing samples with high porosity and high mechanical properties, and difficulty in selecting the type and amount of pore-forming agent and other issues to achieve good performance

Active Publication Date: 2020-02-21
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to select the type and amount of pore-forming agent required for raw materials of different components
In addition, for foamed ceramics, the existence of pores often leads to a decrease in the mechanical properties of the sample, making it difficult to prepare samples with both high porosity and high mechanical properties

Method used

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  • CaO-MgO-SiO2 series foamed ceramic taking asbestos tailings as raw material
  • CaO-MgO-SiO2 series foamed ceramic taking asbestos tailings as raw material
  • CaO-MgO-SiO2 series foamed ceramic taking asbestos tailings as raw material

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Experimental program
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preparation example Construction

[0063] The raw materials for the preparation of the foamed ceramics of the phase composition (2) may include the following components in terms of mass fractions: 38-55% calcination mixture, 20-40% waste glass, 5-15% kaolin or bentonite, 3-8% potassium Stone or nepheline, 2-6% perlite, 2-5% quartz sand and 1-3% borax;

[0064] In addition, the foamed ceramics of the phase composition (2) can be composed of 38-55 parts by mass of the calcined mixture, 20-40 parts of waste glass, 5-15 parts of kaolin or bentonite, 3-8 parts of potassium feldspar or nepheline, 2 Prepared from ~6 parts perlite, 2-5 parts quartz sand and 1-3 parts borax.

[0065] The raw materials for the preparation of the foamed ceramics of the phase composition (3) may include the following components in terms of mass fractions: 30-48% calcination mixture, 25-40% waste glass, 3-15% kaolin or bentonite, 3-8% potassium Stone or nepheline, 2-6% perlite, 2-5% quartz sand and 1-3% borax;

[0066] In addition, the fo...

example 1

[0087] Raw material composition: 48% asbestos tailings roasting mixture, 28% waste glass, 8% kaolin or bentonite, 6% potassium feldspar or nepheline, 5% perlite, 3% quartz sand, 2% borax.

[0088] making process:

[0089] (1) Grinding the calcined mixture and auxiliary raw materials to obtain green body powder, the particle size of the green body powder is 75 μm.

[0090] (2) Mix the green body powder and the binder uniformly and then granulate to obtain the green body granules. The binder includes one or both of starch, polyvinyl alcohol and carboxymethyl cellulose in water suspension Cloudy liquid or solution, the granulation method includes dry rotary granulation and slurry spray granulation, and the average particle diameter of the green granules is 1.5mm.

[0091] (3) Spread the green body granules in the forming mold, and dry press them with a green body forming press to obtain the green body. The pressure of the dry pressing is 80 MPa, and the pressure holding time is ...

example 2

[0098] Raw material composition: 45% roasting mixture, 32% waste glass, 10% kaolin or bentonite, 5% potassium feldspar or nepheline, 3% perlite, 3% quartz sand, 2% borax.

[0099] making process:

[0100] (1) Grinding the calcined mixture and auxiliary raw materials to obtain green body powder, the particle size of the green body powder is 75 μm.

[0101] (2) Mix the green body powder and the binder uniformly and then granulate to obtain the green body granules. The binder includes one or both of starch, polyvinyl alcohol and carboxymethyl cellulose in water suspension Cloudy liquid or solution, the granulation method includes dry rotary granulation and slurry spray granulation, and the average particle diameter of the green granules is 1.5mm.

[0102] (3) Spread the green body granules in the forming mold, and dry press them with a green body forming press to obtain the green body. The pressure of the dry pressing is 80 MPa, and the pressure holding time is 10 s.

[0103] (...

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Abstract

The invention provides CaO-MgO-SiO2 series foamed ceramic taking asbestos tailings as a raw material. The CaO-MgO-SiO2 series foamed ceramic is prepared from the following components in parts by mass:35 to 48 percent of SiO2, 28 to 40 percent of MgO, 8 to 20 percent of CaO, 5 to 12 percent of Fe2O3, 3 to 12 percent of Al2O3, 3 to 8 percent of Na2O, 2 to 5 percent of B2O3, 2 to 4 percent of K2O, 0.5 to 1 percent of MnO and 0.02 to 0.08 percent of BaO. The CaO-MgO-SiO2 series foamed ceramic has the beneficial effects that low-cost, high-utilization-rate and high-added-value utilization of the asbestos tailing waste residues and the waste glass can be realized, and meanwhile, the foamed ceramic is excellent in performance and high in safety in the use process.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic functional materials, in particular to a CaO-MgO-SiO with asbestos tailings as raw material 2 Department of foam ceramics. Background technique [0002] Asbestos tailings are the tailings produced during the mining and beneficiation of chrysotile tailings, and about 20-30 tons of asbestos tailings are produced for every ton of chrysotile produced. The stockpiling of asbestos tailings not only occupies a large amount of land and causes a waste of resources, but also the asbestos fibers in them will cause harm to the environment and human health. Waste glass is an important solid waste. According to statistics, the annual output of waste glass in China exceeds 3.2 million tons, and only 10% of glass waste is recycled. Therefore, the utilization of asbestos tailings and waste glass is of great significance to resource and environmental protection. [0003] Ceramic foam is a new type of lightw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/20C04B35/22C04B35/14C04B35/16C03C3/087
CPCC04B38/00C04B35/20C04B35/22C04B35/14C04B35/16C03C3/087C04B2235/3463C04B2235/96C04B2235/9607C04B2235/77C04B38/0067C04B38/0074
Inventor 孙红娟郑文苗彭同江丁文金
Owner SOUTHWEAT UNIV OF SCI & TECH