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Sodium chloride spherocrystals and preparation method thereof

A technology of sodium chloride and spherulites, which is applied in the field of salt crystallization to achieve the effect of reducing the agglomeration rate and improving fluidity

Active Publication Date: 2018-01-12
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sodium chloride products obtained by these two processes are cubic crystals

Method used

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  • Sodium chloride spherocrystals and preparation method thereof
  • Sodium chloride spherocrystals and preparation method thereof
  • Sodium chloride spherocrystals and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 60.0g of sodium chloride to 200mL (the density of water is 1g / mL, the mass ratio of sodium chloride to water is 0.3:1) deionized water, start stirring, the stirring rate is 600rpm, and the system temperature is 80°C , adopt the decompression evaporation crystallization method, the evaporation rate of water is 10mL / hr (that is, 5% / hr of water volume), evaporate 140mL of water (solid-liquid ratio is 45%), and then continue to stir for 4h. Then filter, and dry the filter cake at 40°C under normal pressure for 12 hours to constant weight to obtain the sodium chloride spherulite product. The mass fraction of crystals within the particle size range of 0.25-0.6mm is 71.22%, and the mass fraction of crystals below 0.25mm is 0.81%. The roundness value of the product is 0.88, the caking rate is 25%, and the angle of repose is 19.2°.

Embodiment 2

[0040] Add 70.0g of sodium chloride into 200mL (that is, the mass ratio of sodium chloride to water is 0.35:1) of deionized water, start stirring, the stirring rate is 500rpm, the system temperature is 60°C, and the method of vacuum evaporation and crystallization is adopted. The evaporation rate is 20mL / hr (ie 10% / hr of water volume). 120 mL of water was evaporated (37% solid-to-liquid ratio), and stirring was continued for 6 h. Then filter, and dry the filter cake at 50°C and normal pressure for 10 hours to constant weight to obtain the sodium chloride spherulite product. The mass fraction of crystals within the particle size range of 0.25-0.6mm is 75.13%, and the mass fraction of crystals below 0.25mm is 0.94%. The roundness value of the product was 0.90, the caking rate was 29%, and the angle of repose was 19.9°.

Embodiment 3

[0042] Add 70.0g of sodium chloride to 200mL (that is, the mass ratio of sodium chloride and water is 0.35:1) of deionized water, start stirring, the stirring rate is 500rpm, the system temperature is 65°C, and the vacuum evaporation crystallization method is adopted. The evaporation rate is 10mL / hr (ie 5% / hr of water volume). 130 mL of water was evaporated (45% solid-to-liquid ratio), and stirring was continued for 6 h. Then filter, and dry the filter cake at 70°C under normal pressure for 8 hours to constant weight to obtain the sodium chloride spherulite product. The mass fraction of crystals within the particle size range of 0.25-0.6mm is 72.36%, and the mass fraction of crystals below 0.25mm is 0.70%. The roundness value of the product was 0.89, the caking rate was 26%, and the angle of repose was 20.2°.

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Abstract

The invention relates to sodium chloride spherocrystals and a preparation method thereof. The sodium chloride spherocrystals have the average roundness of 0.88 or above and the repose angles of 21 degrees or below. The preparation method comprises the following steps: adding sodium chloride into water to obtain a solution, stirring at 60-80 DEG C according to the stirring speed of 400-700 rpm, evaporating 50-70% of water via reduced pressure evaporation crystallization, then continuing stirring for 4-6h, filtering and drying to obtain the sodium chloride spherocrystals. The preparation methodis short in technical process, low in production cost and efficient, and in the preparation process, no any additive is used; in a prepared crystal product, the mass fraction of crystals in the particle size range of 0.25-0.6 mm is greater than 70%, and the mass fraction of crystals in the particle size range of 0.25 mm or below is smaller than 1%, the prepared sodium chloride spherocrystals havethe repose angles of 21 degrees or below and the caking rate of 30% or below, and have better fluidity and better anti-caking performance.

Description

technical field [0001] The invention belongs to the technical field of salt crystallization, in particular to a sodium chloride spherulite and a preparation method thereof. Background technique [0002] Sodium chloride (Sodium chloride), chemical formula NaCl, is white crystal in appearance, its source is mainly seawater, tastes salty, and is the main component of table salt. Sodium chloride has good stability and its aqueous solution is neutral. Industrially, hydrogen and chlorine are produced when electrolyzing aqueous sodium chloride solution, and chlorine is widely used in chemical industry; metal sodium can also be prepared by electrolysis of a mixture of molten sodium chloride and calcium chloride; in addition, sodium chloride Necessary for many biological responses. It is used to configure saline in medical treatment, and it can be used as condiment in daily life. [0003] In the currently widely used table salt products, sodium chloride is mainly in the cubic crys...

Claims

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Application Information

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IPC IPC(8): C01D3/24C01D3/26
Inventor 龚俊波朱明河王静康任杰尹秋响邱琦侯宝红李媛李振方靳沙沙
Owner TIANJIN UNIV
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