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Production process of electronic grade high-purity barium hydroxide

A barium hydroxide and production process technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of long time, high purity of barium hydroxide, looseness and no agglomeration, etc., and achieve long agglomeration time , high product yield and simple production process

Active Publication Date: 2018-03-13
青岛红蝶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to overcome existing high-purity barium hydroxide and provide a kind of production technology of electronic grade high-purity barium hydroxide, adopt recrystallization and centrifugal dehydration method, gained barium hydroxide purity is high, and barium hydroxide is not pulverized, and time Long stay loose and not agglomerated

Method used

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  • Production process of electronic grade high-purity barium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Turn on the water pump and add 6m 3 Water, be warmed up to 80 ℃, start stirring, add 3 tons of low-strontium (strontium content is less than 50ppm) high-purity barium chloride, after the barium chloride melts, stop stirring and stand-by; Open the lye metering tank valve, add 3300kg caustic soda, Then turn on the material pump, put the barium chloride clear liquid into the reaction tank, start stirring, raise the temperature to 90°C, close the steam valve, stop stirring; turn on the material pump to put the material into the crystallization tank, start the crystallization tank to stir and open the jacket Cooling water for cooling and crystallization; open the discharge valve of the crystallization tank, put the liquid with crystals into the centrifuge for dehydration, the centrifuge speed is 1000rpm, the dehydration time is 30min, wash with an appropriate amount of water, and stop after about 10 minutes , to obtain a crude crystallization of Ba(OH) 2 ·8H 2 O.

[0020]...

Embodiment 2

[0022] Turn on the water pump and add 6.5m 3 Water, be warmed up to 80 ℃, start stirring, add 3 tons of low-strontium (strontium content is less than 50ppm) high-purity barium chloride, after the barium chloride melts, stop stirring and stand-by; Open the lye metering tank valve, add 3300kg caustic soda, Then start the material pump, put the barium chloride clear liquid into the reaction tank, start the stirring, heat up to 80°C, turn on the material pump, put it into the crystallization tank, start the crystallization tank stirring and open the jacket cooling water to cool down and crystallize; The feed liquid with crystals is put into the centrifuge and dehydrated. The centrifuge rotates at 1800rpm, and the dehydration time is 25min. It is washed with an appropriate amount of water. After about 10 minutes, the machine is shut down to obtain a crude crystalline Ba(OH) 2 ·8H 2 O.

[0023] Add 15m3 water into the chemical tank, raise the temperature to 80°C, start stirring, a...

Embodiment 3

[0025] Turn on the water pump and add 9m 3 Water, heated up to above 80°C, start stirring, add 3 tons of low-strontium (strontium content less than 50ppm) high-purity barium chloride, after the barium chloride melts, stop stirring for use; open the valve of the lye metering tank, add 3300kg caustic soda , then turn on the material pump, put the barium chloride clear liquid into the reaction tank, start stirring, raise the temperature to 85°C, close the steam valve, stop stirring; turn on the material pump, put the material into the crystallization tank, start the crystallization tank to stir and open Jacket cooling water for cooling and crystallization; put the feed liquid with crystals into the centrifuge for dehydration, the centrifuge speed is 2000rpm, the dehydration time is 20min, wash with an appropriate amount of water, and stop after about 10 minutes to obtain a crude Crystalline Ba(OH) 2 ·8H 2 O.

[0026] Add 15m3 water into the chemical material tank, raise the te...

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Abstract

The invention relates to the technical field of barium hydroxide production, and particularly relates to an electronic-grade high-purity barium hydroxide production process, comprising the following steps: adopting a low-strontium high-purity barium hydroxide solution to react with sodium hydroxide to obtain barium hydroxide, heating a barium hydroxide solution to the temperature of 80 DEG C or above, performing cooling crystallization, centrifugally dewatering, and washing with water so as to obtain coarse crystal Ba(OH)2 8H2O; heating and dissolving the coarse crystal Ba(OH)2 8H2O again, heating to 80 GEG C or above, controlling the baume degree of the solution to be 20 Be to 30 Be, performing cooling crystallization with the crystallization period being 20 to 36h, centrifugally dewatering, washing with water, and centrifugally dewatering again. Compared with the prior art, the production process provided by the invention has the advantages that the production process is simple, the product yield is high, and no impurity is introduced into the product, so that the content of impurities, such as strontium is low, the purity is high, and thus, the product meets the requirements for producing precision high-grade electronic components; pulverization is avoided, the product can keep loose and non-caking for a long time, and the use is convenient.

Description

technical field [0001] The invention relates to the production technical field of barium hydroxide, in particular to a production process of electronic-grade high-purity barium hydroxide. Background technique [0002] Electronic grade high-purity barium hydroxide is mainly used in the production of high-purity barium titanate by hydrothermal method, and high-purity barium titanate by hydrothermal method is used in the production of chip multilayer ceramic capacitors (MLCC). At present, the method of producing high-purity barium hydroxide is to adopt the production method of cooling and crystallization. During the drying process, it is easy to cause the surface of the barium hydroxide product to lose water and pulverize, thereby affecting the formulation accuracy of downstream customers. In the existing technology, The method of adding anti-caking agent will be used to avoid caking of barium hydroxide octahydrate, but the consequence of this treatment will introduce impuritie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/02
CPCC01F11/02C01P2006/80
Inventor 刘志龙贾道峰
Owner 青岛红蝶新材料有限公司