A kind of method for synthesizing cordierite powder at low temperature with anhydrous magnesium chloride as molten salt base

A technique for synthesizing cordierite with anhydrous magnesium chloride, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve problems such as complex preparation process, achieve good chemical stability, good repeatability, and improve the effect of product purity

Active Publication Date: 2021-05-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN103253930A uses waste coal gangue to prepare porcelain sanitary ceramics with low expansion and high infrared function, and the preparation process is relatively complicated

Method used

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  • A kind of method for synthesizing cordierite powder at low temperature with anhydrous magnesium chloride as molten salt base
  • A kind of method for synthesizing cordierite powder at low temperature with anhydrous magnesium chloride as molten salt base
  • A kind of method for synthesizing cordierite powder at low temperature with anhydrous magnesium chloride as molten salt base

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Experimental program
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Embodiment 1

[0024] MgO:Al 2 o 3 :SiO2 2 The mol ratio is 2:2:5 as the standard theoretical formula, the quality of the raw material coal gangue and anhydrous magnesium chloride in the present embodiment 1 are respectively 1.1 times and 1.7 times of the quality of the standard theoretical formula, wherein in powder state without Magnesium chloride hydrochloride is used as a molten salt base. Mix the pulverized coal gangue, bauxite, and anhydrous magnesium chloride after grinding to 200 mesh evenly under dry and anhydrous conditions, then calcinate in a box-type resistance furnace at 765°C for 3 hours, and cool to room temperature with the furnace. Then heat and dissolve the calcined product with 80°C deionized water, put it into an 80°C water bath to keep warm, stir, filter, wash for many times, and dry it to obtain cordierite powder.

Embodiment 2

[0026] MgO:Al 2 o 3 :SiO2 2 The mol ratio is 2:2:5 as the standard theoretical formula, the quality of the raw material coal gangue and anhydrous magnesium chloride in the present embodiment 2 are respectively 1.2 times and 1.6 times of the quality of the standard theoretical formula, wherein in powder state without Magnesium chloride hydrochloride is used as a molten salt base. Mix the pulverized coal gangue, bauxite, and anhydrous magnesium chloride after grinding to 200 mesh evenly under dry and anhydrous conditions, then calcinate in a box-type resistance furnace at 765°C for 3 hours, and cool to room temperature with the furnace. Then heat and dissolve the calcined product with 80°C deionized water, put it into an 80°C water bath to keep warm, stir, filter, wash for many times, and dry it to obtain cordierite powder.

Embodiment 3

[0028] MgO:Al 2 o 3 :SiO2 2 The mol ratio is 2:2:5 as the standard theoretical formula, and the quality of the raw material coal gangue and anhydrous magnesium chloride in the present embodiment 3 is respectively 1.1 times and 1.5 times of the quality of the standard theoretical formula consumption, wherein in powder state without Magnesium chloride hydrochloride is used as a molten salt base. Mix the pulverized coal gangue, bauxite, and anhydrous magnesium chloride after grinding to 200 mesh evenly under dry and anhydrous conditions, then calcinate in a box-type resistance furnace at 765°C for 3 hours, and cool to room temperature with the furnace. Then heat and dissolve the calcined product with 80°C deionized water, put it into an 80°C water bath to keep warm, stir, filter, wash for many times, and dry it to obtain cordierite powder.

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Abstract

The invention relates to a method for synthesizing cordierite powder at low temperature using anhydrous magnesium chloride as a molten salt base. According to the chemical composition of cordierite, under dry and anhydrous conditions, weigh the crushed coal gangue, high bauxite, and anhydrous magnesium chloride that have passed through a 200-mesh sieve, and weigh the weighed coal gangue, high bauxite, and anhydrous Mix magnesium chloride evenly, calcinate at a low temperature of 760-800°C for 3-4 hours, cool to room temperature, wash and filter with deionized water several times, and dry to obtain orthorhombic single-crystal cordierite powder. The method uses anhydrous magnesium chloride as molten salt, and can simultaneously solve the defect of magnesium deficiency in raw material composition in the process of preparing cordierite from coal gangue. In the invention, by controlling the ratio of coal gangue, bauxite and molten salt, calcination temperature and time, cordierite powders with different microscopic shapes and sizes can be obtained under low temperature conditions. The method has low cost, low temperature for synthesizing cordierite with molten salt, simple preparation equipment and process, realizes high-efficiency utilization of coal gangue, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of cordierite preparation, and in particular relates to a method for synthesizing cordierite powder at low temperature using anhydrous magnesium chloride as a molten salt base. Background technique [0002] Cordierite is a silicate mineral with good fire resistance, low thermal expansion rate, high hardness and decomposition temperature. It has very broad application prospects in the fields of metallurgy, electronics, automobiles, chemicals, and environmental protection. [0003] Traditional synthetic cordierite generally uses high-temperature solid-phase method, sol-gel method, precipitation encapsulation method, etc. Du Yongjuan et al. used the "kaolin-talc-alumina" system to synthesize cordierite; Xu Xiaohong et al. used the "rectorite-talc-alumina" system to synthesize cordierite; Xue Qunhu used the "pyrophyllite-bauxite-magnesite-talc" system Synthetic cordierite: These synthetic cordierite using natu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/626C04B35/195C01B33/24
CPCC01B33/24C01P2004/52C04B35/195C04B35/62675C04B2235/3217
Inventor 刘银胡志强宋瀚轩周仓苏万福
Owner ANHUI UNIV OF SCI & TECH
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