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Calcium hexa-aluminate prepared by oyster shells and preparation method of calcium hexa-aluminate

A technology of calcium hexaaluminate and oyster shell, which is applied in the preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, etc., achieves remarkable economic and social benefits, improves product quality, improves mechanical properties and high temperature stability. Effect

Inactive Publication Date: 2013-08-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After retrieval, there is no report on the preparation of calcium hexaaluminate materials by using oyster shells instead of calcium-containing raw materials at home and abroad. This project is the first technology researched and invented at home and abroad.

Method used

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  • Calcium hexa-aluminate prepared by oyster shells and preparation method of calcium hexa-aluminate
  • Calcium hexa-aluminate prepared by oyster shells and preparation method of calcium hexa-aluminate

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preparation example Construction

[0019] The specific steps of the preparation method for preparing the calcium hexaaluminate material from oyster shells are as follows:

[0020] 1) Put oyster shell powder and aluminum profile factory anodic oxidation waste residue in a ball mill to grind for 10-12 hours according to the ratio of raw materials, filter and dehydrate the ground slurry, dry at 80-100°C, and crush to obtain 30-60 mesh aggregates;

[0021] 2) Add 1-2 wt% binder PVA, mix evenly in the mixer, trap the material for 10-12 hours, and press the mixture into shape;

[0022] 3) The molded sample is dried at 80-100°C for 10-12 hours, then placed in a kiln at 1400-1600°C for reaction and sintering for 2-5 hours, and cooled to room temperature to obtain high-purity calcium hexaaluminate material.

Embodiment 1

[0024] The weight ratio of the raw material formula in this example: oyster shells are 21wt%, and aluminum profile factory anodic oxidation waste residues are 79wt%. Weigh the two raw materials according to the formula, place them in a ball mill and grind them for 12 hours. The ground slurry is filtered and dehydrated, dried and crushed at 100°C to obtain a total material of less than 30 meshes; add binder PVA and mix evenly in a mixer , trap the material for 12 hours, press the mixed material into shape; dry the formed sample at 100°C for 12 hours; place the sample in a kiln for reaction sintering, the reaction sintering temperature is 1400°C, the sintering holding time is 5 hours, and the furnace is cooled to At room temperature, the obtained calcium hexaaluminate material contains CA 6 (CaAl 12 o 19 ): 90.2%, CA 2 (CaAl 4 o 7 ): 4.5%, Al 2 o 3 :5.3% (mass ratio, the same below).

Embodiment 2

[0026] The weight ratio of the raw material formula in this example: oyster shells are 21wt%, and aluminum profile factory anodic oxidation waste residues are 79wt%. Weigh the two raw materials according to the formula, place them in a ball mill and grind them for 12 hours. The ground slurry is filtered and dehydrated, dried and crushed at 100°C to obtain a total material of less than 30 meshes; add binder PVA and mix evenly in a mixer , trap the material for 12 hours, press the mixture into shape; dry the formed sample at 100°C for 12 hours; place the sample in a kiln for reaction sintering, the reaction sintering temperature is 1500°C, the sintering holding time is 3 hours, and cool down to At room temperature, the obtained calcium hexaaluminate material contains CA 6 (CaAl 12 o 19 ): 93%, CA 2 (CaAl 4 o 7 ): 3.2%, Al 2 o 3 : 3.8%.

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Abstract

The invention provides calcium hexa-aluminate prepared by oyster shells and a preparation method of the calcium hexa-aluminate. For the calcium hexa-aluminate, the oyster shells and anodic oxidation waste residues in an aluminum profile factory are used as raw materials, the raw materials are mixed and molded in a compression manner, and then high-temperature sintering reaction is performed to prepare the calcium hexa-aluminate. The calcium hexa-aluminate and the preparation method of the calcium hexa-aluminate belong to the comprehensive utilization of solid wastes, the problems that a greatamount of waste oyster shells are poured out in coastal areas, occupy mudflats, breed mosquito and flies and pollute air and an underground water source after being decomposed, and an ugly appearanceand other environment pollution and threats are presented can be solved. In addition, the production cost of the calcium hexa-aluminate is saved, and the economic benefit is remarkable; and the calcium hexa-aluminate material prepared by the method has excellent high-temperature thermal property and mechanical performance, and has strong market competitiveness and popularization and application values.

Description

technical field [0001] The invention relates to the comprehensive utilization of ecological environment materials, that is, solid waste, and more specifically relates to a calcium hexaaluminate prepared from oyster shells and a preparation method thereof. Background technique [0002] In coastal areas, due to the developed aquaculture industry, the area and output of oyster farming are astonishing. In Xiamei Town, Zhangpu County, Fujian Province alone, the oyster breeding area reaches 30,000 mu. At present, the processing of seafood such as oysters in my country is limited to the edible meat part, and the processing and utilization of oyster shells, which account for more than 60% of the oyster mass, is not much, resulting in a large number of oyster shells becoming low-value resources or resources. The waste occupies a large amount of tidal flats and land, and also brings many adverse effects to the environment. Oyster shells have stable physical and chemical properties, ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/16
Inventor 于岩王键郑跃国谢继玲
Owner FUZHOU UNIV