International name: Orthoboric Acid, Boratic Acid

Synonyms: orthoboric acid, trihydroxibor

Chemical formula: H3BO3

Appearance: white crystalline powder

Manufacturing: Russia, Turkey

Packaging and storage: p / e bag 25 kg; 2 years

 

Description

Boric acid is a microfertilizer containing 17.3% boron. It is used as a boron component of complex fertilizers for presowing seed treatment and foliar fertilizing. It is soluble in water. It is obtained by treating natural minerals with various acids.
In nature, boric acid is found in the form of a mineral sassolin, as well as in thermal waters and natural brines, from which it is extracted with alcohols or a mixture of polyols or sorbed with inorganic and organic sorbents.

 

Properties

Density: 1.435 (15ºC) g / cm.
Melting point: 169ºC
Boiling point: 300ºC
Easily soluble in water, in alcohols, in organic substances. In water it is practically insoluble - at a temperature of 20 ºC the norm is 49.5 g / l. Insoluble in ether. Melting point / boiling point: 169ºC / 300ºC. In mineral acids it dissolves worse than in water, and in salt solutions is better.

 

Receiving

Boric acid is produced in several ways. They are extracted from fumaroles - jets of gases and vapors, emerging from the earth's crevices. The vapors are sent to the pool with water, when evaporated, boric acid crystals fall to the bottom. The remaining solution is concentrated and slowly cooled. The resulting crude boric acid is crystallized to remove impurities.

When processing borax with acids. You can use sulfuric, hydrochloric and sulfuric acids. In the latter case, SO2 is passed through a solution or aqueous suspension of a mineral containing a borax.

When treating magnesium borates with sulfuric, hydrochloric, nitric or phosphoric acid. When processing datolite and its associated minerals with sulfuric acid.

Application

- in the industry for the production of special borosilicate glass, resistant to sharp temperature changes. Boric acid is used in the manufacture of enamels, pigments, cements, fluxes, corrosion inhibitors, flame retardants, as well as detergents and cosmetics;
- in nuclear reactors as an absorber of neutrons dissolved in a coolant;
- as a boron fertilizer;
- in laboratories used for the preparation of buffer solutions;
- in medicine - as an independent weak, non-irritating tissue antiseptic and disinfectant. Boric acid is used externally in the form of aqueous and alcoholic solutions, ointments, pastes, and also prescribed in powder for skin diseases;
- in photography - as a part of fine-grained developers and acid fixatives to create a weak acid medium;
- in cooking - as a preservative, registered as food additive E284;
- in everyday life it is used as an insecticide for fighting ants and cockroaches.

Depending on the application, boric acid is available in four grades: for optical glass, A, B and B. The product "for optical glass" is used for optical glassware and other special purposes; A brand product is used for electrolytic capacitors; product of brand B - for the production of fiberglass, optical glasses, medicine and other purposes; product of brand B - for glass making, production of enamels and glazes, borax, fertilizers and other boron-containing products.

Safety requirements

Boric acid is fire-and explosion-proof, according to the degree of impact on the body, refers to substances of the 3rd class of danger. It can be dangerous only with uncontrolled ingestion. Dangerous concentration in the human body can occur with regular application. The lethal dose for poisoning through the mouth for an adult is 15-20 g, for children 4-5 g.

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