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Preparation method of bunch-shaped calcium sulphate dihydrate

A calcium sulfate dihydrate, bouquet-like technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of gypsum microstructure change, affecting the performance of gypsum products, etc., and achieves convenient operation, high yield and simple synthesis route. Effect

Active Publication Date: 2014-07-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different types of admixtures will cause changes in the microstructure of gypsum, thereby affecting the performance of gypsum products

Method used

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  • Preparation method of bunch-shaped calcium sulphate dihydrate
  • Preparation method of bunch-shaped calcium sulphate dihydrate
  • Preparation method of bunch-shaped calcium sulphate dihydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 0.2wt% sodium carboxymethylcellulose (CMC) solution with 500mL of deionized water, ultrasonically stir at 30°C for 0.5 hours, then add calcium chloride with an equivalent concentration of 0.1M, and continue stirring at 30°C for 0.5 hours; Then, potassium aluminum sulfate dodecahydrate with an equivalent concentration of 0.05M was stirred and added into the calcium chloride solution, and stirring was continued at 30°C until precipitation appeared, and filtered to obtain calcium sulfate dihydrate filter cake; the obtained calcium sulfate filter cake was added with ethanol and water Filter and rinse at room temperature, or filter the calcium sulfate filter cake obtained by drying at 60°C and add ethanol and water to filter and rinse at room temperature; dry the washed calcium sulfate filter cake at 50°C for 5 hours to obtain a bouquet-shaped calcium sulfate dihydrate .

[0030] A kind of bouquet-shaped calcium sulfate dihydrate phase that is prepared above is measu...

Embodiment 2

[0035] Prepare 0.4wt% sodium carboxymethylcellulose (CMC) solution with 1000mL of deionized water, ultrasonically stir at 50°C for 0.5 hours, then add calcium chloride with an equivalent concentration of 0.3M, and continue stirring at 50°C for 0.5 hours; then Stir and add potassium aluminum sulfate dodecahydrate with an equivalent concentration of 0.15M into the calcium chloride solution, continue stirring at 50°C until precipitation appears, and filter to obtain calcium sulfate dihydrate filter cake; add ethanol and water to the calcium sulfate filter cake obtained at room temperature Filter and rinse under water, or filter the calcium sulfate filter cake obtained by drying at 70°C and then add ethanol and water to filter and rinse at room temperature; dry the washed calcium sulfate filter cake at 80°C for 8 hours to obtain a bouquet-shaped calcium sulfate dihydrate.

[0036] A kind of bouquet-shaped calcium sulfate dihydrate phase that above-mentioned preparation obtains is m...

Embodiment 3

[0038] Prepare 0.5wt% sodium carboxymethylcellulose (CMC) solution with 5000mL of deionized water, ultrasonically stir at 80°C for 0.5 hours, then add calcium chloride with an equivalent concentration of 0.5M, and continue stirring at 80°C for 0.5 hours; then Stir and add potassium aluminum sulfate dodecahydrate with an equivalent concentration of 0.25M into the calcium chloride solution, continue stirring at 80°C until precipitation appears, and filter to obtain calcium sulfate dihydrate filter cake; add ethanol and water to the calcium sulfate filter cake obtained at room temperature Filter and rinse under water, or filter the calcium sulfate filter cake obtained by drying at 80°C and add ethanol and water to filter and rinse at room temperature; dry the washed calcium sulfate filter cake at 60°C for 10 hours to obtain a bouquet-shaped calcium sulfate dihydrate.

[0039] A kind of bouquet-shaped calcium sulfate dihydrate phase that above-mentioned preparation obtains is measu...

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Abstract

The invention discloses a preparation method of bunch-shaped calcium sulphate dehydrate, belonging to the technical field of inorganic material preparation in material chemistry. The preparation method comprises the following steps of providing a calcium source by 0.1-0.5M of calcium chloride, and providing sulfate radicals by 0.05-0.25M of aluminum potassium sulfate; synthesizing in a low-concentration (0.1-0.5wt%) CMC (Carboxy Methylated Cellulose) water solution, reacting for 0.5h, washing at room temperature by taking ethanol and deionized water as leacheates, filtering, and drying at the temperature of 50-80 DEG C for 3-10h to obtain bunch-shaped calcium sulphate dehydrate. The method is low in selected raw material price, simple in synthesis route, convenient to operate and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of material chemistry inorganic material preparation, and more specifically relates to a preparation method of bouquet-shaped calcium sulfate dihydrate. Background technique [0002] The structure and morphology control of crystals is full of challenges in crystal engineering research, and has always aroused widespread interest of scientists in different fields. [0003] Calcium sulfate dihydrate, also known as gypsum. As a mineral raw material with a long history, it has more and more broad development and application prospects in the fields of environment, sanitation, and construction because of its environmental friendliness, unique physical properties, and easy processing. In the past ten years, the research on gypsum at home and abroad has mainly focused on the crystal phase transformation and stabilization. The hydration process of building gypsum is controlled by doping metal inorganic salts, small i...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 王金淑贾新建吴俊书杜玉成李洪义张晓菲
Owner BEIJING UNIV OF TECH
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