Manufacture of Cement Retarder in PT. Petrokimia Gresik

Cement Retarder manufacture flow diagram

Description :

1.  Purification

Slurry Tank is the main tool that serves to accelerate the dissolution of impurities and filters for separating solids from the filtrate. Phosphorus gypsum sign Slurry Tank stirred and added neutralized slurry water to a concentration of 35%, the next entry drawn Filters for solids / cake and a cake with the help of conveyor is stored in Purified Gypsum Retarder as raw material CR. The filtrate filtrate were then separated gas and liquid in the Vacuum Receiver and Mist Separator, so the gas will be sucked and teracumulasi with raw clarified water and further gas released into the atmosphere while Liquida flows into Recovered Water Pit to be mixed with Seal Water (Eff. Treat.) Which will be used as washers Filter Cloth.

2. Drying and Calcination

The main equipment is Flash Dryer for drying the purified gypsum to 0% free water and Flash Calsiner to change the gypsum from dihydrat be hemihydrat with crystal water composition 6% .Purified gysum with conveyor entrance to Flash Dryer, gypsum will flow upward because the pull Exhaust Blower and Air hot exhaled from Furnace with inlet temperature of + 900 ° C. Furthermore gysum dried with the help of conveyor entrance to Flash Calsiner and flow upward because the pull Booster by contacting directly by hot air from the furnace at a temperature of + 800 ° C inlet and exit Flash Calsiner expected temperatures 140-160 ° C.

3. Granulation

The main equipment is granulator to make the granules according to the desired size (20-36 mm) with steam heating. Gypsum hemihydrate then taken to Mixer with added Liquida of Scrubber as a batter who previously preheated with steam up to + 85 ° C. Exit gypsum mixer granulator to be made into the grain and to maintain a temperature of 80-85 ° C steam included.

4. Finishing

Granules of granulator then transported by conveyor along + 275 m with the expectation of free water content of 8% and water crystals are 16-17%. Next go Screen to get the appropriate uuran (1-1.5 cm) and under size direcycle to the granulator while the over size before direcycle to granulator milled prior to the Crusher.

5. Gas absorbtion

Gas and dust carried from Dust Collector sequestration advance in the Scrubber with raw media clarified water prior to release into the atmosphere. The solution from the scrubber F and P2O5 containing acidic, so as to be used to make the dough in the granulation process lime gypsum slurry is added as a neutralizer (F and P2O5 will react with the lime milk to form CaF2 and Ca3 (PO4)).