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Crystallization method for high-purity potassium fluoride

A technology of pure potassium fluoride and potassium fluoride, applied in the field of crystallization of high-purity potassium fluoride, can solve problems such as affecting product performance, unstable impurity content, clogging of discharge valves, etc., and achieve good economic value and social value. , Easy to promote and apply, not easy to absorb moisture and bond

Inactive Publication Date: 2009-05-13
CNMC NINGXIA ORIENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the crystallization process of potassium fluoride, the first grown crystal particles settle to the bottom of the pot, which can easily block the discharge valve and must be opened by heating with steam.
The potassium fluoride crystal particles produced by this method are usually relatively small, easy to absorb moisture, uneven in size, and the shape of the crystal is irregular and angular. The impurity content in the product is unstable, and the carbon content is 5-25ppm, which affects the product. end-use performance

Method used

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  • Crystallization method for high-purity potassium fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Send a batch (2000kg) of the synthesized potassium fluoride solution into the crystallizer for circulation by the feed liquid pump, turn on the oil heating system and the axial flow pump, and test the specific gravity in due course. When the specific gravity reaches 1.620g / cm 3 Empty the condensed water in the buffer tank from time to time, refill once an hour during the crystallization process, and keep the liquid level in the evaporation chamber moderate. Keep the outlet oil temperature of the oil heating system at 107°C, the vacuum degree in the crystallizer is 0.08MPa, the solution temperature of the continuous material is 76°C, and the inlet and outlet temperature of the circulating pump is 33°C. The saturated solution flows axially through the central downcomer into the crystal growth section to remove supersaturation, and the crystals grow in suspension in the continuously circulating mother liquor flow. After the particles grow, the sedimentation speed exceeds t...

Embodiment 2

[0022] Send a batch (1500kg) of the synthesized potassium fluoride solution into the crystallizer for circulation by the feed liquid pump, turn on the oil heating system and the axial flow pump, and then test the specific gravity in due course. When the specific gravity reaches 1.620g / cm 3 Empty the condensed water in the buffer tank from time to time, refill once an hour during the crystallization process, and keep the liquid level in the evaporation chamber moderate. Keep the outlet oil temperature of the oil heating system at 110°C, the vacuum degree in the crystallizer is 0.08MPa, the solution temperature of the continuous material is 65°C, and the temperature of the inlet and outlet of the circulating pump is 38°C. The saturated solution flows axially through the central downcomer into the crystal growth section to remove supersaturation, and the crystals grow in suspension in the continuously circulating mother liquor flow. After the particles grow, the sedimentation spe...

Embodiment 3

[0024] Send a batch (1800kg) of the synthesized potassium fluoride solution into the crystallizer for circulation by the feed liquid pump, turn on the oil heating system and the axial flow pump, and then test the specific gravity in due course. When the specific gravity reaches 1.621g / cm 3 Empty the condensed water in the buffer tank from time to time, refill once an hour during the crystallization process, and keep the liquid level in the evaporation chamber moderate. Keep the outlet oil temperature of the oil heating system at 105°C, the vacuum degree in the crystallizer is 0.09MPa, the solution temperature of the continuous material is 69°C, and the inlet and outlet temperature of the circulating pump is 35°C. The saturated solution flows axially through the central downcomer into the crystal growth section to remove supersaturation, and the crystals grow in suspension in the continuously circulating mother liquor flow. After the particles grow, the sedimentation speed exce...

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Abstract

The invention relates to a crystallization method for high-purity potassium fluoride, which is characterized in that crystallization is performed in an evaporative OSLO crystallizer. The potassium fluoride product prepared by the invention is characterized by large crystal granule and even granularity; the crystal represents an ellipsoid; moisture absorption and agglomeration are unlikely to happen; and the carbon content in the product is smaller than 15 ppm and stable. In addition, the daily output of the evaporative OSLO crystallizer for producing potassium fluoride is higher than 1 t, the daily output of the evaporative OSLO crystallizer is 8-10 times greater than that of an original middle-sized decompression crystallizer; the production cost of potassium fluoride is greatly reduced; and the invention has good economic value and social value and is easy to popularize and apply.

Description

technical field [0001] The invention relates to a crystallization method of high-purity potassium fluoride. Background technique [0002] Potassium fluoride is mainly used in various alloys and metal welding fluxes; it is widely used as a fluorinating agent in the formation of organic compounds, and it is used in agriculture to produce sodium fluoroacetate and fluoroacetamide pesticides; it is used in medicine to make fluorine Pacic acid; in addition, it can be used as an absorbent (absorbing HF and moisture), as well as a raw material for making potassium bifluoride, and can also be used for glass carving and food preservation. Due to the nature of KF and the characteristics of its crystal structure, it is easy to absorb moisture and agglomerate when it absorbs carbon dioxide, which affects its performance. Therefore, its quality index must also achieve high purity, complete lattice shape, uniform particle size, good fluidity, and not easy to deliquesce and agglomerate. ...

Claims

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Application Information

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IPC IPC(8): C01D3/22
Inventor 万军米玺学赵德强严国元陈虎兵吕凤贤黄晓荣李建兵
Owner CNMC NINGXIA ORIENT GRP
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