Method for preparing beta-SiAlON multiphase material by using ceramic polishing waste residue and coal gangue

A technology of ceramic polishing waste and coal gangue, which is applied to ceramic products, applications, household appliances, etc., can solve the problems of water and soil pollution, and β-SiAlON composite materials that have not yet been retrieved, so as to achieve increased added value and good social benefits And economic benefits, energy saving effect

Active Publication Date: 2014-07-30
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

3. Water and soil pollution
[0027] At present, there is no report on the preparation of β-SiAlON composite materials using coal gangue and ceramic polishing slag

Method used

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  • Method for preparing beta-SiAlON multiphase material by using ceramic polishing waste residue and coal gangue
  • Method for preparing beta-SiAlON multiphase material by using ceramic polishing waste residue and coal gangue
  • Method for preparing beta-SiAlON multiphase material by using ceramic polishing waste residue and coal gangue

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Embodiment 1

[0058] β-SiAlON materials were prepared by Shanxi coal gangue and Foshan ceramic polishing waste. The chemical composition of coal gangue and ceramic polishing waste was obtained by X-ray fluorescence spectroscopic analysis (XRF), as shown in Table 1.

[0059] Table 1: Chemical composition of coal gangue and ceramic polishing slag (mass percentage: %)

[0060] raw material SiO 2 Al 2 o 3 C CaO Fe 2 o 3 MgO K 2 o Coal gangue fine powder 50.50 43.16 13.64 1.49 1.57 0.8 0.8 Ceramic Polishing Slag 67.99 19.64 / 1.68 0.47 3.36 1.68

[0061] The z value of β-SiAlON is designed to be 3, that is, the molar ratio of Si and Al elements in the raw material is 1:1. The specific preparation method is as follows (see the specific flow chart figure 1 ):

[0062] 1. Pulverize ceramic polishing waste residue and coal gangue respectively, pass through a 45 μm sieve, and the particle size is as shown in Table 2:

[0063] Table 2: Part...

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Abstract

The invention relates to a method for preparing a beta-SiAlON multiphase material by using ceramic polishing waste residue and coal gangue. The method comprises the following steps: 1) respectively crushing the ceramic polishing waste residue and coal gangue, and then mixing ceramic polishing waste residue fine powder, coal gangue fine powder and fine carbon powder at a mass ratio of 1:(5-15):(1-5) to obtain a mixture; 2) adding absolute ethyl alcohol into the mixture, performing wet grinding, then drying, adding a binding agent, uniformly mixing, performing pre-press molding under the pressure of 50-100Mpa, then sintering at 1450-1600 DEG C under a nitrogen atmosphere, cooling, and obtaining the beta-SiAlON multiphase material after cooling to the room temperature. According to the method disclosed by the invention, a beta-SiAlON refractory material is prepared by using the ceramic polishing waste residue and coal gangue, so that the environmental protection requirements of performing harmless, yield-reducing and resourceful treatment on solid waste can be achieved, and the additional values of such resources can be improved; the method has good social and economic benefits.

Description

technical field [0001] The invention relates to the field of recycling of industrial solid waste resources and the preparation of new refractory materials, in particular to a method for preparing β-SiAlON composite phase materials by using ceramic polishing waste slag and coal gangue. Background technique [0002] β-SiAlON is β-Si 3 N 4 with AlN, Al 2 0 3 solid solution of Si 6-z Al z o z N 8-z Represents, where z represents the number of atoms replaced by Al. At 1750°C, Si 6-z Al z o z N 8-z The composition ranges from z=0 to z=4.2. The properties of β-SiAlON are related to the z value. As the z value increases, the unit cell size increases, resulting in weakened bond strength and loose structure, thereby reducing the density, Young's modulus, flexural strength, and thermal expansion coefficient. In addition, the β-SiAlON phase grains are usually long columnar, and have the highest room temperature fracture toughness among various single-phase SiAlON. And the ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/599C04B38/06
Inventor 王习东王博王昊赵大伟张作泰刘丽丽
Owner PEKING UNIV
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