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Process for producing electronic-grade barium hydroxide by recovering high-purity barium chloride mother liquor

A barium hydroxide and barium chloride technology, applied in the field of barium chemical industry, can solve problems such as high cost, loss of barium resources, sulfur pollution, etc.

Pending Publication Date: 2021-05-07
宜昌华昊新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prepare electronic grade barium hydroxide, it is necessary to use electronic grade barium chloride as a raw material. Although the production process is simple, the cost is high and there is a problem of sulfur pollution.
[0004] When producing high-purity barium chloride, it needs to be recrystallized. The mother liquor after crystallization contains a certain amount of barium chloride solution. A part of the mother liquor can be recycled, and the other part can be directly discharged after barium removal. Caused the loss of barium resources, but also increased the pressure on environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The process of recovering high-purity barium chloride mother liquor to produce electronic grade barium hydroxide, the specific steps are:

[0026] S1, in the high-purity barium chloride mother liquor that reclaims, add the sodium hydroxide solution that mass concentration is 32% to carry out reaction, reaction temperature is controlled at 90 ℃, and the reaction time is 0.3h, after reaction finishes, filter while hot above 80 ℃, Transfer the filtrate into a closed crystallization tank, cool it down to below 50°C within 1 hour, then lower the temperature by 10°C per hour to below 18°C, and then maintain the temperature for 1 hour to complete the first cooling crystallization, and perform centrifugation after cooling crystallization , to obtain crude product barium hydroxide;

[0027] S2. Add distilled water to the crude product barium hydroxide, the addition amount is 6 times the mass of the crude product barium hydroxide, heat to above 90°C, use vacuum evaporation to con...

Embodiment 2

[0033] The process of recovering high-purity barium chloride mother liquor to produce electronic grade barium hydroxide, the specific steps are:

[0034] S1, add the sodium hydroxide solution that mass concentration is 38% to react in the high-purity barium chloride mother liquor that reclaims, and reaction temperature is controlled at 85 ℃, and the reaction time is 0.5h, after reaction is completed, filter while hot above 80 ℃, Transfer the filtrate into a closed crystallization tank, cool it down to below 50°C within 1 hour, then lower the temperature by 10°C per hour to below 18°C, and then maintain the temperature for 1 hour to complete the first cooling crystallization, and perform centrifugation after cooling crystallization , to obtain crude product barium hydroxide;

[0035] S2. Add distilled water to the crude product barium hydroxide, the addition amount is 6 times the mass of the crude product barium hydroxide, heat to above 90°C, use vacuum evaporation to concentra...

Embodiment 3

[0038] The process of recovering high-purity barium chloride mother liquor to produce electronic grade barium hydroxide, the specific steps are:

[0039] S1, in the high-purity barium chloride mother liquor that reclaims, add the sodium hydroxide solution that mass concentration is 30% to react, and reaction temperature is controlled at 95 ℃, and the reaction time is 0.2h, after reaction finishes, filter while hot above 80 ℃, Transfer the filtrate into a closed crystallization tank, cool it down to below 50°C within 1 hour, then lower the temperature by 10°C per hour to below 18°C, and then maintain the temperature for 2 hours to complete the first cooling crystallization, and perform centrifugation after cooling crystallization , to obtain crude product barium hydroxide;

[0040] S2. Add distilled water to the crude product barium hydroxide, the addition amount is 6 times the mass of the crude product barium hydroxide, heat to above 90°C, use vacuum evaporation to concentrate...

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Abstract

The invention discloses a process for producing electronic-grade barium hydroxide by recovering high-purity barium chloride mother liquor. The process comprises the following steps: adding a sodium hydroxide solution into the recovered high-purity barium chloride mother liquor to react, controlling the reaction temperature to be 80-100 DEG C and the reaction time to be 0.1-0.5 hour, performing filtering while hot after the reaction is finished, cooling and crystallizing filtrate, and performing centrifugal separation, and obtaining the crude barium hydroxide; adding distilled water into the crude barium hydroxide, heating until the crude barium hydroxide is completely dissolved, carrying out vacuum evaporation concentration, cooling, recrystallizing, filtering, washing crystals with absolute ethyl alcohol, and drying to obtain the electronic-grade barium hydroxide. According to the method, the high-purity barium chloride mother liquor is successfully utilized to produce the electronic-grade barium hydroxide, so that the additional value of the product is improved, the waste of resources is avoided, and the pollution to the environment is also avoided.

Description

technical field [0001] The invention relates to the technical field of barium chemical industry, in particular to a process for producing electronic-grade barium hydroxide by recovering high-purity barium chloride mother liquor, and the electronic-grade barium hydroxide can be used as a raw material for ceramic capacitors. Background technique [0002] The traditional method of producing barium hydroxide is to use barite ore as raw material, first process it into barium sulfide, then react with manganese dioxide, zinc oxide or use ion exchange method to obtain barium hydroxide; barium sulfide can also be used to obtain carbonate After barium, barium oxide and barium silicate, it is processed into barium hydroxide. [0003] The most general method that domestic and foreign industrial production adopts at present is to produce barium hydroxide with caustic soda reaction after barium sulfide is made into barium chloride. In order to prepare electronic-grade barium hydroxide, e...

Claims

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Application Information

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IPC IPC(8): C01F11/02C01D3/04
CPCC01F11/02C01D3/04C01P2006/80
Inventor 林福平
Owner 宜昌华昊新材料科技有限公司
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