Method for preparing high-purity secondary boric acid

A high-purity, boric acid technology, used in boron oxyacids, boron oxy compounds, etc., can solve the problems of not meeting the requirements of purity and impurity indicators, and high impurity content of boric acid finished products, achieving low price, less by-products, and energy consumption. low effect

Inactive Publication Date: 2015-03-04
重庆市盛馨种业有限公司
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Problems solved by technology

The acidification and neutralization method of borax is a mature technology, which is a traditional boric acid production method at home and abroad. However, the boric acid finished product prepared by the traditional process has a high content of impurities, and the purity of boric acid can only meet the reagent standard, which is far from being satisfied with the nuclear grade in the containment technology. Boric acid requirements for purity and impurity indicators

Method used

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preparation example Construction

[0017] A method for preparing high-purity secondary boric acid, comprising the steps of:

[0018] Prepare the crude boric acid into an unsaturated solution, heat to dissolve the boric acid, filter it with quartz sand while it is hot, and inject the filtrate into the treated strong acid and strong alkali mixed bed ion exchange column after cooling, and control the flow rate;

[0019] The ion-exchanged solution is heated and concentrated at low temperature, and then filtered through a microporous membrane and placed in a sealed plastic cup;

[0020] Cool in a low-temperature constant temperature tank to precipitate boric acid crystals, centrifuge, vacuum filter, wash, and vacuum dry to obtain secondary boric acid.

Embodiment 1

[0022] Prepare the crude boric acid into an unsaturated solution, heat it to 50°C to dissolve the boric acid, filter it with quartz sand while it is hot, and inject the filtrate into the treated strong acid and strong base mixed bed ion exchange column after cooling, and control the flow rate to 8mL / min ;Heat and concentrate the ion-exchanged solution at 40°C, then filter it through a microporous membrane and place it in a sealed plastic cup; heat and concentrate the ion-exchanged solution at low temperature, then filter it through a microporous membrane and place it Put it in a sealed plastic cup, put it into a 3°C low-temperature thermostat to cool down, and make the boric acid crystallize out. After centrifugation, vacuum suction filtration, washing, and vacuum drying, the crude secondary boric acid is obtained.

Embodiment 2

[0024] Prepare the crude boric acid into an unsaturated solution, heat it to 55°C to dissolve the boric acid, filter it with quartz sand while it is hot, and inject the filtrate into the treated strong acid and strong base mixed bed ion exchange column after cooling, and control the flow rate to 9mL / min ;Heat and concentrate the ion-exchanged solution at 49°C, then filter it through a microporous membrane and place it in a sealed plastic cup; heat and concentrate the ion-exchanged solution at low temperature, then filter it through a microporous membrane and place it Put it in a sealed plastic cup, put it into a low-temperature constant temperature bath at 4°C to cool, and precipitate the boric acid crystals, centrifuge, vacuum filter, wash, and dry in vacuum to obtain the crude secondary boric acid.

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PUM

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Abstract

The invention relates to a method for preparing high-purity secondary boric acid. The method comprises the following steps: preparing rough boric acid into an unsaturated solution, heating to dissolve boric acid, filtering the hot dissolved boric acid by using quartz sand, cooling, injecting the filtrate into a treated strong-acid strong-alkali mixing bed ion exchange column, controlling the flowing speed, heating and concentrating a solution (which is subjected to ion exchange) at a low temperature, filtering by using a microfiltration membrane, putting into a sealed plastic cup, cooling in a low-temperature constant-temperature tank to separate out boric acid crystals, performing centrifugal separation, carrying out suction filtering in vacuum, washing, and drying in vacuum, thus obtaining secondary boric acid. By adopting the method, the price of raw materials is low, a small amount of byproducts are generated, the energy consumption is low, and high-purity secondary boric acid is easy to prepare.

Description

technical field [0001] The invention relates to a method for preparing boric acid, in particular to a method for preparing high-purity secondary boric acid. Background technique [0002] In the nuclear industry, nuclear-grade natural boric acid is mostly used instead of isotope 10B as a neutron moderator, collector and coolant, and the amount is large. The acidification and neutralization method of borax is a mature technology, which is a traditional boric acid production method at home and abroad. However, the boric acid finished product prepared by the traditional process has a high content of impurities, and the purity of boric acid can only meet the reagent standard, which is far from being satisfied with the nuclear grade in the containment technology. Requirements for purity and impurity indicators of boric acid. From the perspective of process control, improving the technical level of boric acid production, improving the crystallization integrity of the product, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10
CPCC01B35/109
Inventor 张洪卫
Owner 重庆市盛馨种业有限公司
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