Preparation method for high-purity boric acid and nuclear-grade high-purity boric acid

A high-purity boric acid and boric acid technology, applied in the direction of boron oxide compounds, can solve problems such as unfavorable nuclear power industry development, 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: 2014-11-19
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method for high-purity boric acid and nuclear-grade high-purity boric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1 The preparation method of 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 H 3 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] Example 2 Preparation method of 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] Example 3 The preparation method of 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 for high-purity boric acid and nuclear-grade high-purity boric acid, and belongs to the fine chemical engineering technology field. The method comprises the following technological steps: first, industrial boric acid is stirred with water, impurities of calcium, magnesium and sodium are removed, and high-purity boric acid precursors are obtained after solid-liquid separation; second, the high-purity boric acid precursors are dissolved in hot pure water and a boric acid solution containing H3BO3 with a concentration of 180g/L-280g/L is prepared, iron and heavy metal are subjected to depth removal by utilization of composite additives, then filtration, cooling crystallization, solid-liquid separation, washing and drying are carried out, and the high-purity boric acid product is obtained. The high-purity boric acid product is dissolved in pure water, recrystallization is carried out for 1-2 times, dehydration and drying are carried out, and the nuclear-grade high-purity boric acid product is obtained. Through the preparation method, the high-purity boric acid products with different grades can be obtained, and the preparation method is advantaged by simple technology, easy operation and control, good reappearance, low production cost, and environmental protection.

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 Applications(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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