Process for preparing calcium sulfate whisker

A calcium sulfate whisker and raw material preparation technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve problems such as difficult industrialized large-scale production, high process production costs, and serious equipment corrosion , to achieve the effects of easy industrial production, low production cost and improved production capacity

Inactive Publication Date: 2005-03-23
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] (1) The raw material concentration of the hydraulic thermal method is low (less than 2%), the process production cost is high, and it is not easy to industrialize large-scale production
[0013] (2) A large amount of sulfuric acid is used in the atmospheric acidification process, which seriously corrodes the equipment, and also produces a large amount of acid-containing wastewater, which seriously pollutes the environment

Method used

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  • Process for preparing calcium sulfate whisker
  • Process for preparing calcium sulfate whisker
  • Process for preparing calcium sulfate whisker

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053] The raw materials are selected from Hubei Province. The main elements of the raw materials are Ca and S, and the impurities are Mg, Si, Al, Fe, etc. The raw gypsum (CaSO 4 2H 2 The content of O) was 98%. Prepare raw gypsum powder and water to form a slurry with a weight concentration of 4-14%. After being emulsified by an emulsifier, put it into a high-pressure reactor, seal it, start stirring at a stirring speed of 400-1000rpm, and start heating. During the synthesis of calcium sulfate whiskers, a temperature sensor is used to measure the solution temperature in the reactor, and a pressure sensor is used to measure the pressure in the reactor. When the reaction temperature and pressure reach a certain value (100-200° C., 1-3 atm), the preparation reaction ends. The solution is filtered, dried at a temperature of 200-400° C., and depolymerized to obtain a calcium sulfate whisker product. Scanning electron microscope or transmission electron microscope is used to test...

example 2

[0055] Add additives in embodiment 1, concrete method is as follows: at the beginning of reaction, adjust the pH value of gypsum emulsion, make it reach 8~12, other conditions are the same as example 1, obtain calcium sulfate whisker product. The test results of the product show that the crystal form is calcium sulfate fiber, the fiber diameter is below 100nm, and the aspect ratio is 50-1000.

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Abstract

This invention is a preparation method of calcium sulfate crystal whisker. The material is plaster stone (CaSO4.2H2O) and water in the entire production. After raw material preparation, building up reactions, dehydrate, refine and edulcoration. Its characteristic is that the active content of plaster stone up to above 95%, the whiteness is above 90%. Mixed with water and turn into plaster stone slime, then put them into reactor to make them have chemical reaction, then on the other procedures. The calcium sulfate crystal whisker made by this method has good performance, low cost, and can be used in all kinds of industries.

Description

Technical field [0001] The invention belongs to the fields of mineral processing and non-metallic materials, and specifically relates to a preparation method of calcium sulfate whiskers. Background technique [0002] Whiskers refer to fibrous single crystals with a fixed cross-sectional shape, complete shape, perfect internal structure, and a high aspect ratio of 5-1000. They are the most high-grade reinforcing components in composite materials. Composite materials with excellent properties can be prepared by using whiskers as reinforcing components. [0003] Industrial developed countries such as the United States and Japan attach great importance to the research and development of whiskers, and a variety of whiskers have been applied. For example, adding whiskers such as silicon carbide and silicon nitride to ceramics can significantly improve the quality of ceramic materials. Strength and toughness, but the price is very expensive. The price of silicon carbide whiskers p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C30B29/10C30B29/62
Inventor 韩跃新王泽红袁致涛于福家印万忠李启亮
Owner NORTHEASTERN UNIV
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