1, Molecular formula: CaCO₃

2, Molecular Formula: 100.09

3, Physical and chemical properties:
Gray powder, odorless, tasteless. There is no change in the exposed air, the specific gravity is 2.71. Melting point 825 (decomposition). Almost insoluble in water, insoluble in alcohol.

4. Features and uses
The limestone powder is added to water to make a slurry as an absorbent pumped into the absorption tower and full contact and mixing with the flue gas, the sulfur dioxide in the flue gas and the calcium carbonate in the slurry and the air bulging in the lower part of the tower carry out oxidation reaction to generate calcium sulfate, after the calcium sulfate reaches a certain saturation, crystallization forms gypsum dihydrate. The gypsum slurry discharged by the absorption tower is concentrated and dehydrated to make its water content less than 10%, and then sent to the gypsum storage silo by a conveyor for stacking, and the desulfurized flue gas is removed by the mist eliminator to remove the droplets, and then heated and heated by the heat exchanger, and then discharged into the atmosphere by the chimney. Due to the repeated circulation of the absorbent slurry in the absorption tower and the flue gas contact through the circulation pump, the utilization rate of the absorbent is very high, the calcium sulfur is relatively low, and the desulfurization efficiency can be greater than 95%. Rotary spray drying flue gas desulfurization process spray drying desulfurization process uses lime as desulfurization absorbent, lime is digested and added with water to make slaked lime milk, slaked lime milk is pumped into the atomization device located in the absorption tower, in the absorption tower, the absorbent atomized into fine droplets is mixed with the flue gas in contact, and the SO2 in the flue gas chemically reacts to form CaSO3, and the SO2 in the flue gas is removed. At the same time, the water brought in by the absorbent is quickly evaporated and dried, and the flue gas temperature decreases. The desulfurization reaction products and unused absorbent are carried out of the absorption tower with the flue gas in the form of dry particulate matter and enter the dust collector to be collected. The flue gas after desulfurization is discharged after dust removal by the dust collector. In order to improve the utilization rate of desulfurization absorbent, part of the dust collector collection is generally added to the pulping system for recycling.

5, Main control index