Preparation method for nuclear-grade high-purity boric acid

A high-purity boric acid, nuclear-grade technology, applied in the direction of boron oxides, etc., can solve the problems of unfavorable nuclear power industry development, high product cost, environmental impact, etc., and achieve the effect of easy operation, low production cost and thorough iron removal

Active Publication Date: 2014-05-14
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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  • Preparation method for nuclear-grade high-purity boric acid
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Examples

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Effect test

Embodiment 1

[0032] A method for preparing nuclear-grade high-purity boric acid is characterized in that it includes the following process steps: 1) leaching boron-magnesium ore raw materials with water to remove water-soluble impurities sodium and potassium to obtain Na 2 Low-sodium boron-magnesite with O content <0.6%; 2) The low-sodium boron-magnesite is further leached with sulfuric acid or hydrochloric acid, and after deep iron removal with compound additives, it is filtered, cooled and crystallized, solid-liquid separated and Washing to obtain boric acid with low iron and sodium content; 3) Dissolving boric acid with low iron and sodium content in pure water, recrystallization, dehydration, and drying to obtain nuclear-grade high-purity boric acid products.

[0033] The composite additive is a combination of sulfide and ammonia water, which is used after dissolving the sulfide in ammonia water or mixing the sulfide with ammonia water.

[0034] The sulfide is any one of ammonium sulfi...

Embodiment 2

[0047] A method for preparing nuclear-grade high-purity boric acid is characterized in that it includes the following process steps: 1) leaching boron-magnesium ore raw materials with water to remove water-soluble impurities sodium and potassium to obtain Na 2 Low-sodium boron-magnesite with O content <0.6%; 2) The low-sodium boron-magnesite is further leached with sulfuric acid or hydrochloric acid, and after deep iron removal with compound additives, it is filtered, cooled and crystallized, solid-liquid separated and Washing to obtain boric acid with low iron and sodium content; 3) Dissolving boric acid with low iron and sodium content in pure water, recrystallization, dehydration, and drying to obtain nuclear-grade high-purity boric acid products.

[0048] The composite additive is a combination of sulfide and ammonia water, which is used after dissolving the sulfide in ammonia water or mixing the sulfide with ammonia water.

[0049] The sulfide is a combination of any two ...

Embodiment 3

[0061] A method for preparing nuclear-grade high-purity boric acid is characterized in that it includes the following process steps: 1) leaching boron-magnesium ore raw materials with water to remove water-soluble impurities sodium and potassium to obtain Na 2 Low-sodium boron-magnesite with O content <0.6%; 2) The low-sodium boron-magnesite is further leached with sulfuric acid or hydrochloric acid, and after deep iron removal with compound additives, it is filtered, cooled and crystallized, solid-liquid separated and Washing to obtain boric acid with low iron and sodium content; 3) Dissolving boric acid with low iron and sodium content in pure water, recrystallization, dehydration, and drying to obtain nuclear-grade high-purity boric acid products.

[0062] The composite additive is a combination of sulfide and ammonia water, which is used after dissolving the sulfide in ammonia water or mixing the sulfide with ammonia water.

[0063] The sulfide is a combination of any thre...

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Abstract

The invention relates to a preparation method for nuclear-grade high-purity boric acid, which belongs to the technical field of fine chemical engineering. The method comprises the following process steps: 1) leaching an ascharite raw material with water so as to remove water-soluble impurities sodium and potassium, thereby obtaining low-sodium ascharite with Na2O content of less than 0.6%; 2) further leaching the low-sodium ascharite with sulfuric acid or hydrochloric acid, adding a composite additive for in-depth iron removal and carrying out filtration and cooling crystallization so as to obtain low-iron low-sodium boric acid; and 3) dissolving low-iron low-sodium boric acid in pure water and carrying out recrystallization twice to three times so as to obtain a nuclear-grade high-purity boric acid product. The method provided by the invention can prepare the nuclear-grade high-purity boric acid with ascharite as the raw material and has the advantages of simple process, easy operation and control, good reproducibility, no addition of organic reagents during preparation, low production cost and environment friendliness.

Description

technical field [0001] The invention relates to a preparation method of high-purity boric acid, in particular to a preparation method of nuclear-grade high-purity boric acid directly used in the nuclear industry by directly using natural boron-magnesium ore as a raw material, and belongs to the technical field of fine chemicals. 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. High-purity boric acid can 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 can...

Claims

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Application Information

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