Formula for preparing dimension stone of magnesia alumina spinel by using sludge from factory of aluminum section, and preparation method

A magnesium aluminum spinel and aluminum profile factory technology, applied in the direction of alkaline earth aluminate/alumina/aluminum hydroxide preparation, etc., to achieve strong market competitiveness, improve product quality, and large surface area

Inactive Publication Date: 2007-05-09
FUZHOU UNIV
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Problems solved by technology

[0003] After searching, there is no report on the preparation of magnesia-aluminum spinel materials from the industrial sludge of aluminum profile factories at home and abroad. This project is the first technology researched and invented at home and abroad.

Method used

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preparation example Construction

[0012] The specific steps of the preparation method of the magnesium aluminum spinel material prepared from the sludge of an aluminum profile factory are as follows:

[0013] (A) According to the formula, put the aluminum profile factory sludge and basic magnesium carbonate in a ball mill and grind for 24 hours, raw materials: balls: water = 1: 1.5: 0.8, filter and dehydrate the ground slurry, and dry at 100 ° C for 24 hours and crushing to obtain less than 30 mesh aggregates.

[0014] (B) Adding (by weight) 6-8% water to the ground material for mixing, the mixing is uniform, and the mixing is subjected to semi-dry pressing.

[0015] (C) The preform is dried at 100°C for 24 hours.

[0016] (D) The dry blank is placed in a kiln for reaction sintering, the reaction sintering temperature is 1300-1650°C, the reaction sintering holding time is 1-8 hours, and naturally cooled to room temperature to obtain magnesia-aluminum spinel with a purity of 80-98%. Material.

Embodiment 1

[0018] The weight ratio of the raw material formula of this example: the aluminum profile factory sludge is 60%, basic magnesium carbonate is 40%. The two raw materials were weighed according to the formula, placed in a ball mill for wet grinding for 24 hours, raw materials: balls: water=1: 1.5: 0.8, the ground slurry was filtered and dehydrated, dried at 100°C for 24 hours, and crushed to obtain less than 30 purpose statistics. 6% water is added to the ground material for mixing, the mixing is uniform, and the mixture is semi-dry pressed. The molded billet was dried at 100°C for 24 hours, and the dry billet was placed in a kiln for reaction sintering at a reaction sintering temperature of 1400°C, a reaction sintering holding time of 4 hours, and naturally cooled to room temperature to obtain a synthetic magnesium aluminum spinel material.

Embodiment 2

[0020] The weight ratio of the raw material formula of this example: the aluminum profile factory sludge is 65%, basic magnesium carbonate is 35%. The two raw materials are weighed according to the formula, placed in a ball mill for wet grinding for 24 hours, raw materials: balls: water=1: 1.5: 0.8, the slurry to be ground is filtered and dehydrated, dried at 100°C for 24 hours and crushed to obtain less than 30 purpose statistics. 6% water is added to the ground material for mixing, the mixing is uniform, and the mixture is semi-dry pressed. The molded billet was dried at 100°C for 24 hours, and the dry billet was placed in a kiln for reaction sintering at a reaction sintering temperature of 1400°C and a reaction sintering holding time of 4 hours, then naturally cooled to room temperature to obtain a synthetic magnesium aluminum spinel material.

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Abstract

This invention provides formula and method for preparing magnesium aluminate spinel material by using sludge from aluminum profile plants as the raw material. The formula comprises sludge from aluminum profile plants and basic magnesium carbonate as the major raw materials. The method comprises: mixing the raw materials, pressing for shaping, reacting at high temperatures, and cooling the product to obtain magnesium aluminate spinel material. The method utilizes sludge from aluminum profile plants as the raw material to prepare magnesium aluminate spinel material, thus can solve the problem of serious environmental pollution caused by the sludge, save the production cost and have a high profit. The prepared magnesium aluminate spinel material has excellent high-temperature thermal properties, mechanical properties and chemical stability, especially obvious chemical stability in alkaline conditions, and is widely used in the fields of refractory materials and ceramics.

Description

technical field [0001] The invention relates to an ecological environment material, that is, comprehensive utilization of solid waste, and more particularly relates to a raw material formula and a preparation method for preparing magnesia-aluminum spinel materials using sludge from an aluminum profile factory. technical background: [0002] Aluminum profile factories will produce a large amount of milky white colloidal waste liquid during the surface treatment of aluminum profiles. The particles in this waste liquid are ultra-fine and highly dispersed. Once discharged directly, it will inevitably cause serious pollution to the environment and river waters, and destroy the ecological environment. . Therefore, a large amount of sludge in the waste liquid must be precipitated and filtered, and the remaining clarified filtrate should be discharged. A large aluminum profile factory can recycle more than 10,000 tons of sludge per year. There are hundreds of domestic aluminum prof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C04B35/443C04B35/626
Inventor 阮玉忠于岩吴任平花能斌沈阳
Owner FUZHOU UNIV
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