Method for preparing calcium sulfate whiskers
A technology of calcium sulfate whisker and magnesium carbonate, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve problems such as high price, and achieve the effects of low cost, good friction ability and good regeneration performance
Inactive Publication Date: 2015-04-22
FANQUN DRYING EQUIP FACTORY WUJIN CITY +1
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Therefore, since the early 1980s, my country has focused on research on whiskers such as silicon carbide, aluminum oxide, and silicon nitride, and has made breakthrough progress; these whiskers have excellent performance, but are expensive and can only be used for certain special applications. occasion
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[0032] The present invention is specifically described below in conjunction with accompanying drawing:
[0033] (1) Ore blending: Dolomite is used as raw material (the ore with high magnesium carbonate content and the ore with low magnesium carbonate content are mixed into 18% calcium carbonate containing magnesium carbonate and 80%), and the prepared ore is sent to the calciner for calcination . Send the burned magnesium oxide and calcium oxide to the next process for leaching.
[0034] (2) Leaching: Mix calcined calcium oxide, magnesium oxide, hydrochloric acid and recycled dilute hydrochloric acid to obtain calcium chloride and magnesium chloride solution.
[0035] (3) Pulping: adjust the calcium chloride and magnesium chloride solution to 20%, use magnesium chloride as the transcrystal enzyme, and the content of magnesium chloride is 20 grams per liter. (If the content of magnesium chloride is too high, use milk of lime as a precipitating agent to produce magnesium hydro...
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Abstract
The invention provides a method for preparing calcium sulfate whiskers. The method includes adopting dolomite as a raw material, conveying prepared ore into a calcining kiln for calcining; mixing calcined calcium oxide, magnesium oxide and diluted hydrochloric acid to prepare calcium chloride and magnesium chloride liquor, heating the prepared calcium chloride liquor, adding diluted sulfuric acid into the calcium chloride liquor, crystallizing under the condition of continuously stirring, and filtering and washing after whiskers are grown completely; sulfonating and modifying neutral calcium sulfate whiskers obtained by means of filtering and washing, filtering, steaming and pressing the calcium sulfate whiskers, and obtaining the calcium sulfate whiskers after the steamed and pressed calcium sulfate whiskers are dried. An obtained product is high in purity and stable in quality and is white, and the method is applicable to producing high-purity calcium sulfate whiskers. In addition, the dolomite is used as the raw material, has huge reservoir and is simple in exploitation, and a comprehensive utilization value of minerals is high. Furthermore, acid liquid is recycled in a production process, and requirements of environmental protection are met.
Description
technical field [0001] The invention relates to a production process of whiskers, in particular to a production process of calcium sulfate whiskers. Background technique [0002] As the most important reinforcing component in composite materials, whiskers have been highly valued by industrialized countries such as the United States and Japan. In recent years, with the rapid development of our country's economy, the amount of whiskers is also increasing. Therefore, since the early 1980s, my country has focused on research on whiskers such as silicon carbide, aluminum oxide, and silicon nitride, and has made breakthrough progress; these whiskers have excellent performance, but are expensive and can only be used for certain special applications. occasions. How to reduce the cost of whiskers and make them more widely used has attracted the attention of the scientific and technological circles. At present, a gypsum fiber (whisker) production line has been successfully studied. Th...
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IPC IPC(8): C30B29/46C30B29/62C30B7/10
Inventor 范炳喜张灵芝
Owner FANQUN DRYING EQUIP FACTORY WUJIN CITY