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Preparation method of calcium sulfite particles with amorphous structure

A calcium sulfite, amorphous technology, applied in the direction of calcium/strontium/barium sulfite, etc., to achieve the effect of high surface energy, simple operation and strong adsorption

Active Publication Date: 2018-10-26
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 with amorphous structure
  • Preparation method of calcium sulfite particles with amorphous structure
  • Preparation method of calcium sulfite particles with 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, and 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 was obtained. particle.

Embodiment 2

[0018] Example 2: In a 200mL beaker, prepare a milk of lime solution with a mass fraction of 5% and a sodium hexametaphosphate solution of 2g / L with water, and then filter the sodium hexametaphosphate solution 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 was obtained. particle. ...

Embodiment 3

[0019] Example 3: In a 200mL beaker, prepare a milk of lime solution with a mass fraction of 10% and a sodium hexametaphosphate solution of 3g / L with water, and then filter the sodium hexametaphosphate solution 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 structure and granular shape was obtained. particle. ...

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Abstract

The invention relates to a method for preparing calcium sulfite particles with an amorphous structure. Firstly, milk of lime and sodium hexametaphosphate solution of a certain concentration are prepared with water respectively, filtered through a filter membrane to remove undissolved impurities, and then a certain amount of Add the sodium hexametaphosphate solution to the milk of lime, and keep stirring to mix the two evenly. Finally, adjust the pH of the solution to 6.8-7.2 with sulfurous acid, and slowly stir to generate calcium sulfite. The resulting calcium sulfite precipitate was filtered, centrifuged and washed alternately with twice distilled water and absolute ethanol, and then fully dried at 60°C. The crystal structure was detected by XRD (X-ray diffraction) and the morphology was examined by SEM (scanning electron microscope). After observation, amorphous calcium sulfite particles were obtained. The appearance of the product obtained in the present invention is granular, the crystal structure presents an amorphous structure, the particle size is 600-800nm, the distribution is uniform, the preparation process is simple, the cost is low, the raw material is safe and non-toxic, and it has good effect on sugar cane juice. De-turbidity effect.

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 Patents(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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