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Preparation method of calcium sulfite particles having amorphous structure

A calcium sulfite, amorphous technology, applied in the direction of calcium/strontium/barium sulfite, etc., to achieve good turbidity removal effect, environmental protection of raw materials, and uniform distribution.

Active Publication Date: 2017-09-22
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports at home and abroad on the application of calcium sulfite with different shapes and structures in the purification of sugar juice.

Method used

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  • Preparation method of calcium sulfite particles having amorphous structure
  • Preparation method of calcium sulfite particles having amorphous structure
  • Preparation method of calcium sulfite particles having amorphous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: In a 200ml beaker, prepare a milk of lime solution with a mass fraction of 5% and a sodium hexametaphosphate solution of 1g / L with water respectively in a 200ml beaker, then filter the sodium hexametaphosphate solution with a 0.45 μm filter membrane to remove undissolved Impurities, then take 20mL of sodium hexametaphosphate solution in the prepared 20g of lime milk solution, and continue to stir for 30min to fully react. Then add sulfurous acid into the reacted solution, adjust pH=7.0, and stir slowly to generate calcium sulfite. Finally, the generated calcium sulfite precipitate was filtered, centrifuged, washed alternately with double distilled water and absolute ethanol three times, and fully dried at 60°C. After crystal structure detection by XRD (X-ray diffraction) and morphology observation by SEM (scanning electron microscope), calcium sulfite with particle size distribution of 600-800nm, uniform distribution, amorphous structure and granular shape wa...

Embodiment 2

[0018] Example 2: In a 200ml beaker, the milk of lime solution of 5% and the sodium hexametaphosphate solution of 2g / L were prepared with water respectively in a 200ml beaker, and then the sodium hexametaphosphate solution was filtered with a 0.45 μm filter membrane to remove undissolved Impurities, then take 30mL of sodium hexametaphosphate solution in the prepared 48g of milk of lime solution, and continue to stir for 30min to fully react. Then add sulfurous acid into the reacted solution, adjust pH=7.0, and stir slowly to generate calcium sulfite. Finally, the generated calcium sulfite precipitate was filtered, centrifuged, washed alternately with double distilled water and absolute ethanol three times, and fully dried at 60°C. After crystal structure detection by XRD (X-ray diffraction) and morphology observation by SEM (scanning electron microscope), calcium sulfite with particle size distribution of 600-800nm, uniform distribution, amorphous structure and granular shape ...

Embodiment 3

[0019] Example 3: In a 200ml beaker, the milk of lime solution with a mass fraction of 10% and the sodium hexametaphosphate solution of 3g / L were prepared with water respectively in a 200ml beaker, and then the sodium hexametaphosphate solution was filtered with a 0.45 μm filter membrane to remove undissolved Impurities, then take 40mL of sodium hexametaphosphate solution in the prepared 80g of milk of lime solution, and continue to stir for 30min to fully react. Then add sulfurous acid into the reacted solution, adjust pH=7.0, and stir slowly to generate calcium sulfite. Finally, the generated calcium sulfite precipitate was filtered, centrifuged, washed alternately with double distilled water and absolute ethanol three times, and fully dried at 60°C. After crystal structure detection by XRD (X-ray diffraction) and morphology observation by SEM (scanning electron microscope), calcium sulfite with particle size distribution of 600-800nm, uniform distribution, amorphous structu...

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Abstract

The invention relates to a preparation method of calcium sulfite particles having an amorphous structure. The method comprises: preparing certain concentrations of lime milk and a sodium hexametaphosphate solution with water, respectively, performing filtration with a filter membrane to remove undissolved impurities, adding a certain amount of the sodium hexametaphosphate solution to lime milk, performing continuous stirring for uniform mixing, adding calcium sulfite to adjust pH of the obtained solution to 6.8-7.2, and performing slow stirring to generate calcium sulfite. The generated calcium sulfite precipitation is filtered and centrifuged and is subjected to alternative washing with secondary distilled water and absolute ethanol, and the obtained product is subjected to full drying at 60 DEG C. Crystal structure detection by XRD (X-ray diffraction) and morphology observation by SEM (scanning electron microscope) are carried out to obtain the amorphous calcium sulfite particles. The obtained calcium sulfite particles have an amorphous crystal structure, have the particle size of 600-800 nm, and are uniform in preparation process. The calcium sulfite particles are simple in preparation process and low in cost, are safe and non-toxic in raw materials, and have a good turbidity removal effect on sugarcane juice.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfite particles with an amorphous structure, belonging to the field of inorganic chemical industry. Background technique [0002] Calcium sulfite is a white crystalline powder that contains 0.5 molecules of crystal water (CaSO 3 0.5H 2 O), heating at 360-390°C will lose crystallization water, and can be decomposed into calcium oxide and sulfur dioxide at 650°C, insoluble in water, used for calcium-plastic materials, cellulose products bleaching and dechlorination agents, food preservatives and fermentation Bactericides are widely used, especially in the sugar industry. It can be made by passing sulfur dioxide into milk of lime or reacting calcium chloride and sodium sulfite. [0003] The application of nascent calcium sulfite in the sugar industry is mainly reflected in the cleaning process of sugar cane juice. The calcium sulfite particles obtained by the traditional method for preparing ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/48
CPCC01F11/48C01P2002/72C01P2004/03C01P2004/62
Inventor 李利军向富友程昊黄文艺孔红星冯军李彦青刘泉田玉红
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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