Method for preparing CaO-MgO-SiO2 series foamed ceramic by utilizing asbestos tailings

A technology for foamed ceramics and asbestos tailings, which is used in the production and application of ceramic products and ceramic materials, can solve the difficulty of selecting the type and amount of pore-forming agent, the reduction of the mechanical properties of the sample, and the difficulty in preparing high porosity and high mechanical properties. problems such as samples, to achieve good performance, high value-added utilization, and easy control.

Active Publication Date: 2020-01-21
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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  • Method for preparing CaO-MgO-SiO2 series foamed ceramic by utilizing asbestos tailings
  • Method for preparing CaO-MgO-SiO2 series foamed ceramic by utilizing asbestos tailings
  • Method for preparing CaO-MgO-SiO2 series foamed ceramic by utilizing asbestos tailings

Examples

Experimental program
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Effect test

preparation example Construction

[0063] The raw materials for the preparation of the foamed ceramics of phase composition (2) can include the following components in terms of mass fraction: 38-55% roasting 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]The raw materials for the preparation of the foamed ceramics of phase composition (3) can include the following components in terms of mass fraction: 30-48% roasting 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.

[0065] The raw materials for the preparation of the foamed ceramics of phase composition (4) can include the following components in terms of mass fraction: 50-70% roasting mixture, 18-35% waste glass, 3-15% kaolin or bentonite, 3-8% potassium Stone or nepheline, 2-6% perlite, 3-5% quartz sand and 1-3% borax.

[0066] In the present embodiment, the prepared cera...

example 1

[0071] 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.

[0072] making process:

[0073] (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.

[0074] (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.

[0075] (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

[0082] 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.

[0083] making process:

[0084] (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.

[0085] (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.

[0086] (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.

[0087] (...

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Abstract

The invention provides a method for preparing CaO-MgO-SiO2 series foamed ceramic by utilizing asbestos tailings. The method comprises the following steps: roasting asbestos tailings at the temperatureof 650-950 DEG C to obtain a roasted mixture; mixing and milling the roasted mixture and auxiliary raw materials to obtain biscuit powder; uniformly mixing the biscuit powder with an adhesive, and granulating the mixture to obtain biscuit granules, the adhesive comprising one or a water suspension or a solution of two of starch, polyvinyl alcohol and carboxymethyl cellulose; pressing and moldingthe biscuit granules to obtain a biscuit; and heating the biscuit to 600-850 DEG C, carrying out heat preservation to remove volatile components in the biscuit, then heating the biscuit to 1050-1250 DEG C to enable the biscuit to expand to form pores, and cooling the treated biscuit to obtain the foamed ceramic. The method has the beneficial effects of low-cost, high-utilization-rate and high-additional-value utilization of the tailings and the waste residues.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic functional materials, in particular to a method for preparing CaO-MgO-SiO from asbestos tailings 2 A method for 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/32C04B38/00
CPCC04B33/1324C04B33/13C04B33/32C04B35/20C04B35/195C04B35/22C04B35/14C04B38/0022C04B2235/36C04B2235/3472C04B2235/3463C04B2235/3418C04B2235/3201C04B2235/3409C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B38/0051C04B38/0061C04B38/0067C04B38/0074Y02P40/60
Inventor 孙红娟郑文苗彭同江
Owner SOUTHWEAT UNIV OF SCI & TECH
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