A kind of preparation method of high-purity boric acid and nuclear-grade high-purity boric acid

A technology of high-purity boric acid and boric acid, which is applied in the direction of boron oxide compounds, can solve problems such as unfavorable development of nuclear power industry, high product cost, environmental impact, etc., and achieve the effect of solving technical problems, easy operation, and thorough removal of heavy metals

Active Publication Date: 2016-08-10
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen that the above two preparation methods of nuclear-grade boric acid both use organic compounds, which not only have an impact on the environment, but also have high energy consumption, and at the same time make the product cost high
[0006] Although my country is a country rich in boron resources, due to the limitation of boron ore grade and preparation technology, the high-purity boric acid used in China's nuclear industry is almost all imported from abroad. Conducive to the development of domestic nuclear power industry

Method used

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  • A kind of preparation method of high-purity boric acid and nuclear-grade high-purity boric acid
  • A kind of preparation method of high-purity boric acid and nuclear-grade high-purity boric acid
  • A kind of preparation method of high-purity boric acid and nuclear-grade high-purity boric acid

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Experimental program
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Embodiment 1

[0033] The preparation method of embodiment 1 high-purity boric acid

[0034] The process steps include: 1) leaching industrial boric acid with water to remove part of the calcium, magnesium, and sodium impurities to obtain a high-purity boric acid precursor; 2) dissolving the high-purity boric acid precursor in pure water at a temperature of 80°C to 90°C , made containing H3 BO 3 180g / L~220g / L boric acid solution, after deep removal of iron and heavy metals with composite additives, then filtered, cooled and crystallized, solid-liquid separation, washed, and dried to obtain high-purity boric acid products.

[0035] The composite additive is a combination of sulfide and ammonia water, which are used after pulping.

[0036] The sulfide is any one of ammonium sulfide, barium sulfide, strontium sulfide, potassium sulfide and sodium sulfide, and its dosage is 15 to 30 times the stoichiometric amount.

[0037] The volume ratio concentration of the ammonia water is 5%, and its co...

Embodiment 2

[0044] The preparation method of embodiment 2 nuclear grade high-purity boric acid

[0045] Firstly, the undried high-purity boric acid obtained in Example 1 was dissolved in pure water at a temperature of 80°C to 90°C to prepare H-containing boric acid 3 BO 3 180g / L~220g / L boric acid solution, then add ammonium nitrate at 2.5~3.5g / L into the solution, heat-preserve and filter, cool and crystallize under stirring conditions to a final temperature of 10℃~20℃, and then separate solid and liquid; Recrystallize in this way for 1-2 times, dry and pack to get the product.

Embodiment 3

[0046] The preparation method of embodiment 3 high-purity boric acid

[0047] The process steps include: 1) leaching industrial boric acid with water to remove part of the calcium, magnesium, and sodium impurities to obtain a high-purity boric acid precursor; 2) dissolving the high-purity boric acid precursor in pure water at a temperature of 80°C to 90°C , made containing H 3 BO 3 240-280g / L boric acid solution, after deep iron removal and heavy metal removal with compound additives, is then filtered, cooled and crystallized, solid-liquid separation, washed, and dried to obtain high-purity boric acid products.

[0048] The composite additive is a combination of sulfide and ammonia water, which are used after pulping.

[0049] The sulfide is a combination of any two of ammonium sulfide, barium sulfide, strontium sulfide, potassium sulfide and sodium sulfide, and its dosage is 10 to 15 times the stoichiometric amount.

[0050] The volume ratio concentration of the ammonia w...

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Abstract

The invention relates to a preparation method of high-purity boric acid and nuclear-grade high-purity boric acid, belonging to the technical field of fine chemicals. The method includes the following process steps: 1) mixing industrial boric acid with water, stirring to remove calcium, magnesium, and sodium impurities, and obtaining a high-purity boric acid precursor after solid-liquid separation; 2) dissolving the high-purity boric acid precursor H in hot pure water 3 BO 3 180g / L~280g / L boric acid solution, after deep removal of iron and heavy metals with composite additives, then filtered, cooled and crystallized, solid-liquid separation, washed, and dried to obtain high-purity boric acid products. The high-purity boric acid product is dissolved in pure water, and after 1-2 times of recrystallization, dehydration, and drying, the nuclear-grade high-purity boric acid product is obtained. The invention not only can obtain high-purity boric acid products of different grades, but also has simple process, easy operation and control, good reproducibility, low production cost and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of fine chemical production, in particular to a method for preparing high-purity boric acid and nuclear-grade high-purity boric acid. Background technique [0002] Boric acid is widely used. In addition to being widely used in glass manufacturing industry, it is also used in enamel, ceramics, metallurgy and other industrial sectors. In addition to being used as raw materials for chemical reagents, fluorescent materials and high borosilicate glass, high-purity boric acid can also be used as a neutron moderator, collector and coolant, and is widely used in the nuclear industry. With the further development of the nuclear power industry in the world, especially in China, the consumption of nuclear grade boron products will increase rapidly. Nuclear grade boric acid for Ca 2+ , Fe 3+ , Pb 2+ , SO 4 2- , Cl - The content of other impurities is very high, and the domestic reagent grade boric acid cannot mee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10
Inventor 刘述平陈炳炎廖祥文刘亚川邹定邦樊尊善谭美法李博唐湘平徐凌飞
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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