Method for preparing calcium sulphate crystal whisker from dolomite
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A calcium sulfate whisker, sulfate technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problems of low development and utilization of dolomite, and achieve low price and high resistance. Tensile strength and elastic modulus, the effect of strong affinity
Inactive Publication Date: 2008-12-17
ZHEJIANG UNIV
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Problems solved by technology
However, the development and utilization of dolomite in my country is very low at present, and most mines only sell raw ore or calcine raw ore into dolomite calcined powder for sale.
Method used
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Embodiment 1
[0020] 1) Fully crush 100 grams of dolomite, add 5 liters of 0.5M HCl solution, continue to stir and react for 0.5 hours, filter out the bottom insoluble residue, and obtain dolomite acidification solution;
[0021] 2) Add 1 liter of 0.5 mol / L sulfuric acid solution to the dolomite acidification solution, heat it under microwave radiation for 1 minute, then transfer it to a 90-degree water bath to age for 2 hours, filter, wash, and dry the solid phase at 50 degrees Dry to obtain calcium sulfate dihydrate whiskers.
Embodiment 2
[0023] 1) Fully crush 100 grams of dolomite, add 0.5 liter of 5M HCl solution, continue to stir and react for 5 hours, filter out the bottom insoluble residue, and obtain dolomite acidification solution;
[0024] 2) Add 10 liters of SO to the dolomite acidification solution 4 2- Na with an ion concentration of 0.05mol / L 2 SO 4 and K 2 SO 4 The mixed solution was heated under microwave radiation for 3 minutes, then moved into a 90-degree water bath to age for 8 hours, filtered, washed, and the solid phase was dried at 200 degrees to obtain anhydrous calcium sulfate whiskers.
Embodiment 3
[0026] 1) Fully crush 100 grams of dolomite, add 2 liters of 1M HCl solution, continue to stir and react for 2 hours, filter out the bottom insoluble residue, and obtain dolomite acidification solution;
[0027] 2) Add 5 liters of 0.1mol / L MgSO to the dolomite acidification solution 4 The solution was heated under microwave radiation for 2 minutes, then moved into a 70-degree water bath to age for 5 hours, filtered, washed, and the solid phase was dried at 120 degrees to obtain calcium sulfate hemihydrate whiskers.
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Abstract
The invention discloses a method for preparing calcium sulphate crystal whiskers by dolostone, which takes the dolostone as a raw material, and prepares the calcium sulphate crystal whiskers through the steps of mineral acidification, microwave seed crystal synthesis and hydro-thermal crystal whisker synthesis, etc. The calcium sulphate crystal whiskers are a nemaline calcium sulphate crystal which has the slenderness ratio of 10 to 10000, the strength close to the theoretical strength of valence links between material atoms, and ultra-high tensile strength and elastic modulus; compared with other crystal whiskers, the calcium sulphate crystal whiskers further have the advantages of high temperature resistance, strong chemical corrosion resistance, good toughness, easier processing of surface modification, strong affinity with polymers and low toxicity, etc., and have wide application prospect in the fields of reinforced plastic, rubber, sizing agent, friction material and environmental engineering, etc. The method for preparing the calcium sulphate crystal whiskers disclosed by the invention uses the natural mineral of dolostone which has wide source and low price as the main raw material, has simple preparing process flow, less equipment investment and easier popularization.
Description
technical field [0001] The invention relates to a preparation method of a compound, in particular to a method for preparing calcium sulfate whiskers from dolomite. Background technique [0002] Dolomite is an important calcium and magnesium resource on the earth, and it has extremely rich reserves in my country. However, the development and utilization of dolomite in my country is very low at present, and most mines only sell raw ore or calcine raw ore into dolomite calcined powder for sale. Although my country is a country rich in resources, it is also a country that wastes resources. How to improve resource utilization has become a major focus of my country's sustainable development strategy. [0003] In recent years, various new materials have emerged one after another, among which whiskers are highly oriented fibrous single crystals grown in the form of single crystals under artificial control conditions. Due to its highly ordered atomic arrangement and few crystal def...
Claims
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