barium silicate formula
Also known as barium metasilicate, BaSiO3, is a colorless, orthorhombic crystalline material with a Mohs hardness of 5. It has a density of 4.399 g/cm3. It has a melting point of 1604 deg C and is insoluble in hydrochloric acid and cold water. It is hydrolyzed in hot water to form soluble barium carbonate and silicate. Barium silicate is used in ceramics, metallurgy, and a variety of industrial applications.
The chemical composition of barium silicate is controlled within narrow limits by controlling the ratio of barium to silicon within a range from 2.2 to 2.71. In order to achieve these goals, a close control of the atmosphere is necessary in the barium silicate kiln. It is important to keep the concentration of reducing gases in excess of the oxygen concentration of the feed materials within the kiln at all times.
In addition to maintaining a low concentration of Fe O, it is important to ensure that the kiln atmosphere has a high temperature homogeneity throughout its length and depth. This is achieved by utilizing a large tube furnace with an internal heating system that can be adjusted to maintain the proper temperature and gas flow to the feed ingredients throughout the kiln process.
Once the leach residue slurry is filtered in filter 12, it is pumped to barite storage tanks 22 and 23 where it is mixed with additional barite to prepare the weak barium silicate leach liquor. This is then pumped to the barium silicate kiln where it is used as the feed ingredient.