Oxide of calcium is applied in production as filler of rubbers, rubbers, he also received wide use in metallurgy, construction, in the water supply system and other industries.
Instruction
1. Take carbonate raw materials carbonatecalcium( ). Burn it at a temperature of 1000-1250 degrees, then carry out clearing of the received calcium oxide with water before formation of suspension, wash out a deposit. There is the subsequent decomposition of hydroxide of calcium to calcium oxide, then it should be crushed. Method shortcomings: complexity of production which depends on high cost of initial raw materials, difficulty of filtration of suspension of hydroxide of calcium.
2. Previously keep carbonate raw materials at a temperature of 100-800 degrees within 0.5-1.2 hours, then process water solution which contains chloride calcium and alcohol or air, separate firm phases and give on roasting at a temperature of 900-1000 degrees. Shortcomings: the high prime cost of initial carbonate raw materials which depends on preliminary preparation before giving on roasting.
3. Take the carbonate raw materials containing a carbonate of calcium and 0.2-5.0% of hydroxide of calcium. Receive calcium oxide by thermal decomposition of raw materials at a temperature of 1000 degrees. The product received in such a way has high calcium oxide, however has not a sufficient indicator, 85-90 percent, on whiteness degree. In this regard it is not applied to production of toothpastes, powders, in other medical purposes without preliminary additional careful cleaning.