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Method for preparing nuclear power-grade high-purity boracic acid

A high-purity boric acid, nuclear power technology, applied in the direction of boron oxide compounds, etc., can solve the problems of unsatisfactory boric acid purity and excessive ionic impurity index, and achieve the effect of remarkable product performance, simple and easy-to-control process, and no environmental pollution.

Inactive Publication Date: 2011-04-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of domestic boric acid is mostly flotation process, which has the problem of excessive metal impurities such as iron and calcium and anion impurities such as sulfate. Recently, we have invented a method for preparing boric acid special for optical glass, but the purity of this type of boric acid is still not enough. Meeting the requirements of the nuclear industry

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0012] Example 1: the rich B 10 Industrial boric acid is dissolved in a solvent, an oxidation aid is added, reacted, filtered, evaporated and crystallized, and the crystal is dried below 70°C to obtain an intermediate product. Mix 1000g of the above-mentioned intermediate product with 5L of reactant, heat and stir for 1h, distill at 60°C, and mix the distillate with water in a volume ratio of 4:3, the reaction temperature is 55°C, evaporate and crystallize after 30min, the crystallization temperature is 50°C, centrifuge Separate the crystals and mother liquor, wash the crystals with water, and dry them under vacuum at 70°C to obtain a product with a purity of 99.9999%, in which the impurity content is: Fe 0.00004%, Ca 0.00005%, Na 0.00008%, Sb10 The content is 19.8%.

Embodiment 2

[0013] Example 2: Dissolving common industrial boric acid in a solvent, adding two kinds of mixed oxidation aids, reacting, filtering, evaporating and crystallizing, drying the crystals below 70°C to obtain an intermediate product. Mix 1000g of the above intermediate product with 6L of reactant, heat and stir for 2h, distill at 120°C, and mix the distillate with water at a volume ratio of 1:1. The reaction temperature is 25°C. After 60min, evaporate and crystallize. Separate the crystals and mother liquor, wash the crystals with water, and dry them under vacuum at 100°C to obtain a product with a purity of 99.9999%, in which the impurity content is: Fe 0.00002%, Ca 0.00006%, Na 0.00009%, Sb 0.00001%, As 0.00001%, Pb 0.00002%, Si 0.00002%, other impurities are less than 0.000001%.

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Abstract

The invention discloses a method for preparing nuclear power-grade high-purity boracic acid, and belongs to the technical field of chemical industry. The method is characterized by comprising the following steps of: dissolving industrial boracic acid serving as raw materials in a solvent, adding aids, reacting for a certain period of time, and evaporating and crystallizing; mixing the dried intermediate product and reactants, heating and stirring to react for a certain period of time, performing azeotropic distillation, and mixing the obtained distillate and water; and after full reaction, evaporating and crystallizing to obtain products, washing and drying to prepare the nuclear power-grade high-purity boracic acid. The whole process is simple and easily controlled without environmental pollution; and obvious competitive advantages and profit margins in manufacturing cost, product performance and other aspects are shown. The purity of the prepared boracic acid is 99.9999 percent, the impurity content is below 1ppm, the strict requirement of the nuclear industry is met, and special requirements on the boracic acid in the fields of nuclear power industry, optical materials, crystalline materials and other high technology can be met.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method of nuclear power grade high-purity boric acid. Background technique [0002] As a neutron shielding agent, boric acid is mainly used in the nuclear industry to control the reaction speed of the reactor core to make the nuclear reactor run stably and safely. However, domestic boric acid products contain higher Ca 2+ , Pb 2+ , Fe 3+ Such impurities will lead to a large amount of deposits inside the pipeline, which will affect the normal use of equipment, cause corrosion to metal parts, and even cause serious leakage of radioactive substances, so they cannot be directly used in the nuclear industry. At present, my country's nuclear industry basically relies on imports of nuclear power-grade high-purity boric acid, and it is necessary to develop new production technologies for nuclear power-grade boric acid. The production process of domestic boric aci...

Claims

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Application Information

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IPC IPC(8): C01B35/10
Inventor 叶俊伟宁桂玲潘欣艾王浩宇贡卫涛林源
Owner DALIAN UNIV OF TECH
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