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Alumina whisker preparation method

An alumina whisker and carbon dioxide technology, applied in the chemical industry, can solve the problems of difficult filtration and high cost, and achieve the effects of low cost, simple equipment and easy industrial production.

Inactive Publication Date: 2017-01-11
北京交泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome the defects existing in the existing alumina whisker preparation method, and provide a new preparation method of alumina whisker, the technical problem to be solved is to use the chemical energy of chemical reaction The method makes the concentration basically unchanged during the reaction process, the shape is uniform, the aspect ratio is higher, and it solves the problems of high cost and difficult filtration in the process of nano-oxides such as alumina whiskers, and the process is simple

Method used

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  • Alumina whisker preparation method

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Effect test

Embodiment 1

[0019] Configure aluminum sulfate solution 0.4mol / L, put calcium carbonate into the reaction kettle, and pour hydrochloric acid. Close the reaction kettle and stir until the reaction is complete, pass carbon dioxide into the ammonia water container and then pass into the above-mentioned aluminum sulfate solution. Stir at 300 rpm for 20 hours until the reaction is complete. 0.6 MPa of carbon dioxide is introduced into the airtight container for pressure filtration. Dry at 100°C and calcined at 1200°C for 1 hour to obtain alumina whiskers.

[0020] The SEM scanning image of the final alumina whisker product is shown in Fig. 1 . The average diameter of the alumina whiskers is 50-100 nm, and the average length of the alumina whiskers is 1-5 μm.

Embodiment 2

[0022] Configure aluminum sulfate solution 0.45mol / L, put calcium carbonate into the reaction kettle, and quickly pour hydrochloric acid. Close the reaction kettle, stir until the reaction is complete, pass carbon dioxide into the ammonia water container and then pass into the above-mentioned aluminum sulfate solution. Stir at 400 rpm for 20 hours until the reaction is complete. 0.5 MPa of carbon dioxide is introduced into the airtight container for pressure filtration. Dry at 100 degrees and calcined at 1150 degrees for 1 hour. Alumina whiskers are obtained.

Embodiment 3

[0024] Configure aluminum sulfate solution 0.5mol / L, put calcium carbonate into the reaction kettle, and quickly pour hydrochloric acid. Close the reaction kettle, stir until the reaction is complete, and pass carbon dioxide into the above-mentioned aluminum sulfate solution. Stir at 300 rpm for 20 hours until the reaction is complete. 0.4MPa carbon dioxide is passed through the airtight container for pressure filtration. Dry at 100 degrees and calcined at 1200 degrees for 1 hour. Alumina whiskers are obtained.

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Abstract

The invention relates to a low-cost energy-saving effluent-free recycling method for preparation of an alumina plate with uniform morphology, and the method is as follows: preparing an aluminum sulfate solution with the concentration of 0.4-0.5mol / L; adding a hydrochloric acid solution into a reaction kettle with calcium carbonate, quickly closing the reaction kettle, stirring until the reaction in the reaction kettle is completed and a pressure is formed; slowly introducing obtained carbon dioxide and ammonia into the prepared aluminum sulfate solution, stirring for 20 to 24 hours until the reaction is completed; putting reacted slurry into a sealed container, introducing the carbon dioxide with the pressure of 0.1-0.6MPa for press-filteration; and drying at 100 DEG C, and calcining at the temperature of 1000-1200 DEG C to obtain nano alumina whiskers. A calcium chloride solution obtained by the above reaction is reacted with ammonium sulfate waste liquor to obtain calcium sulfate, waste liquor ammonium chloride is reacted with the calcium carbonate for recycling, and the method has the advantages of control the morphology of alumina, small concentration changes in feeding process, uniform morphology, low cost, no pollution, recycling, simplification of industry, wide use, acquisition of by-product calcium sulfate whiskers, and the like.

Description

technical field [0001] The invention relates to a preparation process in the field of chemical industry, in particular to a preparation method of alumina whiskers. Background technique [0002] Alumina is an important structural ceramic material, which has a wide range of applications in dielectric, high wear-resistant and high-strength applications. Nanoceramics have attracted widespread attention due to their excellent mechanical properties. Nanowhiskers have higher mechanical properties due to higher interfacial energy than fibers. Widely used in the reinforcement of tire rubber, paint, plastic and other industries. Alumina whiskers have not only high strength but also high temperature properties. The traditional preparation of nano-alumina whiskers is mostly prepared by using alkaline solution, urea, etc. as a precipitating agent or by high-temperature smelting. During the process, with the increase of ammonia water and other feed materials, the concentration of reac...

Claims

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Application Information

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IPC IPC(8): C30B29/20C30B29/62C30B7/14
Inventor 李锋涛于显著王静
Owner 北京交泰科技有限公司
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