Definition and Uses of Boric acid
Boric acid, also borasis acid, orthoboric acid or acidium borium; A white crystalline, water-soluble inorganic acid often used in antiseptics, pesticides, and deodorizers. It was first discovered by Wilhelm Homberg and emerged as a byproduct of sulfuric acid.
Production of boric acid from colemanite
Boric acid is produced from colemanite in Turkey. It is produced by Etibank. The manufacturing process basically consists of the reaction of colemanite with sulfuric acid. As shown below, gypsum and boric acid are formed as a result of the reaction. Gypsum formed during production causes environmental pollution.
Ca2B6O11.5H2O + 2H2SO4 + 6H2O → 2CaSO4. 2H2O + 6H3BO3
In production, first of all, colemanite is ground in mills with a size of <0.2 mm. Ground colemanite is taken into solution by reacting with sulfuric acid. This reaction takes place at 80-100 oC.
Appearance : Crystal, Powder White Color
Chemical Name: Boric Acid
Chemical Formula: H3BO3
Packaging Type: In 25 Kg Bags
After colemanite is taken into solution with acid, gypsum mud is formed due to chemical reaction. In order to remove this gypsum from the environment, it is necessary to filter the solution with pressure filters. For this purpose, two-stage filtration is performed. In the first stage, the entire solution is removed for 15-20 minutes. filtered throughout. The filtrate, which has passed the first stage, is filtered in another pressure filter for about 3 hours in the second stage. The gypsum mud obtained as a result of these stages is sent to the residual pool.
The colemanite solution obtained after filtration is fed to the crystallizer at a constant flow rate. The solution coming to the crystallizer is sprayed with special sprays and spread to the crystallizer. In this way, the size of the formed crystals is increased and the process continues more efficiently. The factors affecting the crystal size are:
Density of the fed solution
solids in solution
Centrifuge After the solution enters the crystallizer at 80-90 oC, it leaves at 40-45 oC and is fed to the centrifuge. In the centrifuge, the solution is separated from the crystals.
The crystals coming out of the centrifuge are slightly moist. The product cannot be offered for sale while it is damp in this way. For this purpose, it needs to be dried with fluid bed dryers. In such dryers, after the air taken from outside is heated up to a certain temperature, it is supplied to the material laid inside the dryer from the bottom.
The product coming out of the dryer is sold in bags.
- Boric acid is one of the most widely produced borates and is widely used in the pharmaceutical and cosmetic industry, in the manufacture of glass and fiberglass, as a nutritional additive, flame retardant, and in the manufacture of wood preservatives to control pests.
- Boric acid is non-toxic with antibacterial properties and is often used as an antiseptic agent, acne treatment, preservative, insecticide, pH buffer, swimming pool chemicals, flame retardant, and precursor to many beneficial chemicals.
- Industrially, fiberglass is used to manufacture glass used in household glassware and LCD displays.