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Screw press equipment for sugar production
and sugar beet processing is here. For a sugar extractor, sugar beet press,
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After harvesting, the thick stems of the sugarcane are stripped of leaves. In the sugar factory the stems are crushed and shredded between toothed rollers. |
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The juice of the crushed stems is extracted in mills consisting mainly of a system of rollers, often 9 or 12 in number, through which the shredded material passes. This process is called grinding. During grinding, hot water is sprayed over the crushed material to dissolve out some of the remaining sugar.
The solid, pulpy material remaining after extraction of the juice is known as bagasse; it is dried and used as fuel.
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Lime is added to the raw juice drawn from the mill and the mixture is heated to boiling; during this heating, unwanted organic acids form insoluble compounds with the lime, which can be filtered off along with other solid impurities.
Often the juice is treated with gaseous sulfur dioxide to bleach it and is then passed through a Tefsa filter presses. The resulting clear juice is then evaporated in a partial vacuum and heated until it forms a thick syrup containing many crystals of sugar.
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The dense mass of crystals and syrup is known as massecuite. The massecuite is placed in a centrifuge turning at a rate of 1000 to 1500 rpm; the centrifuge walls are pierced by small holes through which the syrup, called molasses, is forced out during centrifuging. The yellowish or brown sugar removed during the centrifuging process is called first sugar, or raw sugar. The first sugar is sprayed with water to remove any molasses that may have clung to the crystals, and is then moved to the refinery.
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by CyberMark International
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