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GENERAL
M/s Chintamani Agrotech (India) Ltd., proposes to establish sugar manufacturing unit having capacity 3500TCD and 30 MW co-generation plant at Bijoraa Tal: Mahagaon, Dist. Yawatmal. Its main object is to set up this unit and provide good remunerative prices to local farmers for their sugarcane produce by promoting sugarcane cultivation programmes on commercial basis and to make the area self sufficient of the electricity requirements.
2.0 MANUFACTURING PROCESS
A. Sugar Unit
The flow diagram for manufacture of sugar is given in Fig. The process involves the following stages.
i. Crushing of sugarcane
ii. Juice clarification (Double sulphitation of clarification)
iii. Crystalization
iv. Curing
v. Grading and bagging
i. CRUSHING OF SUGARCANE
Sugarcane is harvested in the fields, dressed and bundled in small bundles, stacked in lorries, tractors trailers or bullock carts, supplied to factories weighed and crushed in a set of mills.
Crushing takes place mainly in two stages; first the preparation and then milling takes place after preparing the cane in leveler, cutter and fibrizer. The prepared cane is then crushed by passing through 4 sets of mills. Hot water is added in the course of crushing as imbibition water for better extraction of juice from sugar cane. After crushing, the bagasse is sent to boiler as fuel and juice is sent for purification and recovery of sugar.
ii. JUICE CLARIFICATION (DOUBLE SULPHITION)
The weighed quantity of juice is primarily heated to 70-75 °C in juice heater. It undergoes a process of sulphition i.e. simultaneous addition of lime and sulphur dioxide. The juice thus sulphited is heated again to 100-150 °C in another set of juice heaters. The hot juice is decanted out from the clarifier and sent for evaporation in a set of multiple effect evaporator bodies. Inevaporators the juice at 15 % is concentrated in to syrup of 80 % concentration. The syrup thus obtained is again sulphited with SO2 gas for the purpose of bleaching.
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