Method for preparing high-strength foamed ceramic from solid waste

A technology of solid waste and foamed ceramics, which is applied in the production and application of ceramic products and ceramic materials, and can solve problems such as hindering the growth of pores.

Active Publication Date: 2021-05-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the fiber has a high modulus of rupture, and the composite with the ceramic matrix can significantly improve the fracture strength of the ceramic matrix, but the long fiber is easily eroded by the melt at high temperature and hinders the growth of pores

Method used

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  • Method for preparing high-strength foamed ceramic from solid waste
  • Method for preparing high-strength foamed ceramic from solid waste
  • Method for preparing high-strength foamed ceramic from solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Dry the fly ash, coal-fired slag, copper tailings, and chromium-containing sludge, and grind them to a particle size of <75 μm;

[0029] 2) Weigh the ingredients according to the ratio of fly ash: coal-fired slag: copper tailings: chromium-containing sludge = 20%: 10%: 50%: 20%, and add 0.35% composite blowing agent and 0.15% The dispersant is mixed and ground in a steel ball mill for 3 hours to make a uniformly mixed billet, and the fineness of the billet is 2.0% after sieving through a 45 μm square hole sieve;

[0030] 3) Add 3% polycrystalline mullite fiber with a diameter of 20 μm and a length of 60 to 100 μm as a reinforcing agent to the billet, and add tap water of equal quality, and stir at a high speed in a planetary mortar mixer for 15 minutes to make a uniform slurry;

[0031] 4) Dry the slurry in a hot air drying oven, crush it into powder, and then fill it in a cordierite refractory mold with refractory fiber paper, with a thickness of 6±1mm. In a box-ty...

Embodiment 2

[0037] 1) Dry coal gangue, coal-fired slag, copper tailings, lithium tailings, and chromium-containing sludge, and grind them to a particle size of <75 μm;

[0038]2) Weigh the ingredients according to the ratio of coal gangue: coal-fired slag: copper tailings: lithium tailings: chromium-containing sludge = 5%: 25%: 35%: 20%: 15%, and add 0.25% compound Foaming agent and 0.15% dispersant are mixed and ground in a steel ball mill for 3 hours to make a uniformly mixed billet, the fineness of which is 2.1% after sieving through a 45 μm square hole sieve;

[0039] 3) Add 4% alumina fibers with a diameter of 15 μm and a length of 100 to 200 μm as a reinforcing agent to the billet, and add tap water of equal quality, and stir at high speed in a planetary mortar mixer for 20 minutes to make a uniform slurry;

[0040] 4) Dry the slurry in a hot air drying oven, crush it into powder, and then fill it in a cordierite refractory mold with refractory fiber paper, with a thickness of 6±1mm...

Embodiment 3

[0046] 1) Dry coal-fired slag, copper tailings, and chromium-containing sludge, and grind them to a particle size of <75 μm;

[0047] 2) Weigh the ingredients according to the ratio of coal-fired slag: copper tailings: chromium-containing sludge = 30%: 45%: 25%, and add 0.15% composite foaming agent and 0.15% dispersant, in the steel ball mill Medium mixing and grinding for 4 hours to make a uniformly mixed billet, the fineness of which is 1.2% after sieving through a 45 μm square hole sieve;

[0048] 3) Add 4% carbon fiber with a diameter of 5 μm and a length of 200 μm as a reinforcing agent to the blank, and add tap water of equal quality, and stir at a high speed in a planetary mortar mixer for 15 minutes to make a uniform slurry;

[0049] 4) Dry the slurry in a hot air drying oven, crush it into powder, and then fill it in a cordierite refractory mold with refractory fiber paper, with a thickness of 6±1mm. In a box-type electric furnace, the temperature was raised to 1195...

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Abstract

The invention relates to the technical field of ceramic material preparation, in particular to a method for preparing high-strength foamed ceramic by using solid wastes, which comprises the following steps: by taking industrial solid wastes such as coal-series solid wastes, metal tailings and the like as main raw materials and chromium-containing sludge as a crystalline phase regulating agent, adding 0.1-1.0% of composite foaming agent and 0.05-0.6% of dispersing agent, performing dry ball-milling and mixing to prepare uniform powder, adding 0.5-5% of chopped fibers as a reinforcing agent, performing wet-process high-speed stirring to prepare uniformly dispersed slurry, and then performing drying and powder preparation, die-filling and firing, cooling and crystallizing, and cutting and forming to prepare the product. According to the method for preparing the high-strength foamed ceramic by using the solid wastes, the problems of high raw material cost and poor mechanical property of the existing foamed ceramic are solved, and high value-added utilization of the solid wastes is realized.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, in particular to a method for preparing high-strength foamed ceramics from solid waste. Background technique [0002] Foamed ceramics is a kind of closed-cell ceramic-based material produced by powder high-temperature foaming method. It has excellent characteristics such as light weight, high strength, thermal insulation, sound insulation, waterproof and flame-retardant, and has been used as building exterior wall insulation materials and self-insulation partition walls. Material. The raw materials of foamed ceramics are mainly composed of aluminum-silicon raw materials, flux raw materials and foaming agents, but because of the low quality requirements for raw materials, the preparation of foamed ceramics from solid waste has become the main research direction. However, the composition of solid waste is usually quite different from that of foamed ceramics. Using a single sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B33/13C04B33/132C04B33/36
CPCC04B38/02C04B33/132C04B33/1321C04B33/131C04B33/36C04B33/1328C04B2235/3217C04B2235/3418C04B2235/3208C04B2235/3206C04B2235/3201C04B2235/3272C04B2235/5224C04B2235/5248C04B2235/5228Y02P40/60
Inventor 葛雪祥张莹樊传刚
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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