Appearance :Crystal, Powder White Color
Chemical Name: Boric Acid
Chemical Formulaü : H3BO3
Packaging Type:In 25 Kg Sacks
Definition and Areas of Use:Boric Acid, also known as boracic acid, orthoBoric Acid or acidium borium; A white crystalline, water-soluble inorganic acid often used in antiseptics, insecticides, and deodorizers. It was first discovered by Wilhelm Homberg and emerged as a byproduct of sulfuric acid.
Boric Acid production from colemanite
In Turkey, Boric Acid is produced from colemanite. Production is carried out by Etibank. The production process basically consists of reacting colemanite with sulfuric acid. As shown below, the reaction results in gypsum and Boric Acid. Gypsum formed during production causes environmental pollution.
Ca2B6O11.5H2O + 2H2SO4 + 6H2O → 2CaSO4. 2H2O + 6H3BO3
In production, first of all, colemanite is ground in mills to a size of <0.2 mm. Ground colemanite is put into solution by reacting with sulfuric acid. This reaction takes place at 80-100 oC.
filtration
After colemanite is taken into solution with acid, gypsum sludge is formed due to the chemical reaction. In order to remove this gypsum from the environment, it is necessary to filter the solution with pressurized filters. For this purpose, two-stage filtration is performed. In the first stage, the entire solution is infused for 15-20 minutes. floats along. The filtrate that has passed through the first stage is filtered in another pressurized filter for about 3 hours in the second stage. The gypsum sludge obtained as a result of these stages is sent to the residue pool.
crystallization
The colemanite solution obtained after filtration is fed to the crystallizer with a constant flow rate. The solution coming to the crystallizer is sprayed with special sprays and spreads throughout the crystallizer. In this way, the size of the crystals formed is increased, allowing the process to continue more efficiently. Factors affecting crystal sizes are:
Density of the fed solution
solids in solution
feed rate
Centrifuge: After the solution enters the crystallizer at 80-90 oC, it exits at 40-45 oC and is fed to the centrifuge. In the centrifuge, the solution is separated from the crystals.
Drying
The crystals coming out of the centrifuge are somewhat moist. The product cannot be put on sale while it is damp like this. For this purpose, it needs to be dried with fluid bed dryers. In this type of dryers, the air taken from outside is heated to a certain temperature and then given to the material laid inside the dryer from the bottom.
The product coming out of the dryer is bagged and sold.
Areas of Use
