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Method for removing water and purifying chloride

A purification method and chloride technology, applied in chemical instruments and methods, tin chloride, arsenic compounds, etc., to avoid leakage, reduce the generation of hydrolyzate slag, and reduce potential safety hazards.

Pending Publication Date: 2022-07-22
广东先导微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water removal and purification method of this method has a simple process and high water removal efficiency, which effectively solves a series of problems such as kettle cracking, pipeline blockage, and sediment caused by chlorides carrying water, improves the stability of equipment operation, and reduces safety risks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 150L of dechlorinated arsenic trichloride solution (water content is about 1000ppm) into a 200L stirring tank, and then add 20L concentrated sulfuric acid solution. Turn on the stirring, the stirring speed is 60 r / min, and after stirring for 60 min, let it stand for 2 h. After complete stratification, the arsenic trichloride solution at the bottom is released, and then it is passed through the calcium chloride molecular sieve adsorption column. The molecular sieve bed height is about 2.0m, the diameter is 200mm, and the molecular sieve particle size is 0.2mm. Under the condition of 18cm / min, adsorption, dehydration and drying, the water content of arsenic trichloride after drying was measured to be less than 5ppm.

[0025] The arsenic trichloride after dewatering can directly enter the metal rectifying tower to remove impurities through the metal pipeline to obtain chloride with a purity of more than 6N.

Embodiment 2

[0034] 150L of antimony trichloride solution after dechlorination (water content is about 1000ppm) was heated to 80°C for insulation, added to a 200L stirring tank, and then 20L of concentrated sulfuric acid solution was added to keep the temperature at 80°C. Turn on the stirring, the stirring speed is 60 r / min, and after stirring for 60 min, let it stand for 2 h. After complete stratification, the antimony trichloride solution at the bottom is released, and then it is passed through the calcium chloride molecular sieve adsorption column. The molecular sieve bed height is about 2.0m, the diameter is 200mm, and the molecular sieve particle size is 0.2mm. Under the condition of 18cm / min, adsorption, dehydration and drying, the content of antimony trichloride water after drying was measured to be less than 5ppm.

[0035] The antimony trichloride after water removal can directly enter the metal rectifying tower through the metal pipeline to remove impurities to obtain chlorides wi...

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Abstract

The invention belongs to the technical field of industrial raw material purification, and discloses a water removal and purification method of chloride. The method comprises the following steps: adding concentrated sulfuric acid into dechlorinated chloride, stirring and mixing, standing for layering, then taking the chloride at the lower layer, deeply dewatering through a molecular sieve, further feeding the obtained dewatered chloride into a metal rectifying tower for impurity removal, and thus obtaining the dewatered and purified chloride. The water removal and purification method is simple in process and efficient in water removal, effectively solves a series of problems of kettle cracking, pipeline blockage, sediment and the like caused by chloride with water, improves the operation stability of equipment, and reduces the safety risk. Meanwhile, the chloride subjected to water removal directly enters metal equipment for rectification and impurity removal, and the chloride subjected to impurity removal and purification through the metal equipment can also meet the requirement for the purity of 6N or above.

Description

technical field [0001] The invention belongs to the technical field of purification of industrial raw materials, in particular to a method for removing water and purifying chlorides. Background technique [0002] High-purity metal materials are mainly used in the preparation of magnetic recording materials, magnetic sensor materials, optoelectronic materials and integrated circuits, hydrogenation catalysis, large-scale integrated circuits, atomic reactor protection materials, biological materials, aero-engines, low-expansion alloys, semiconductors and other fields. [0003] Different types of high-purity metals have different preparation methods. Among them, one type of high-purity metals is commonly prepared by chlorination reduction method. The process flow is mainly raw material sublimation---chlorination---dechlorination---rectification- --Reduction, in this process, it is often necessary to purify their corresponding chlorides (such as arsenic trichloride, antimony tric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/00C01G30/00C01G19/08
CPCC01G28/007C01G19/08C01G30/006C01P2006/80
Inventor 曾小东徐成蒋剑勇
Owner 广东先导微电子科技有限公司
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