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By T. M. Cook, D. J. Cullen

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Extra info for Chemical Plant and its Operation. Including Safety and Health Aspects

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Crystallizers The simplest form of crystallizer is an open steam-jacketed pan into which the saturated solution is poured and the solvent (usually water) is evaporated. T o eliminate overheating of the product in contact with the heated wall a slow-speed, scraper-type rake rotates inside the pan. This also ensures uniform cooling and crystal size. Larger continuous crystallizers often achieve crystal formation by cooling a supersaturated solution in a reactor-type vessel with brine or cooling water circulated through its jacket.

20). Mills and Crushers There is a vast range of equipment designed to achieve size reduction of material. Large boulders are usually broken down in jaw crushers, which will accept lumps up to 300 η in size at rates of approximately 150 kg/s and discharge the crushed material at under Chemical Plant 51 25 m size. Crushing is achieved by compressing the lumps between the fixed and moving jaws, the latter being pivoted at the discharge end, and driven by an eccentric shaft. This ensures that there is a maximum size that the crusher will discharge.

M. with a high centrifugal force can separate particles as small as 5 microns. Modern centrifuges incorporate fully automatic control and valve systems with comprehensive instrumentation and controls for operation, automatic solids ejection and cleaning in situ. M a n y have automatic nitrogen inertion to reduce explosion risk when handling solvents. There are many types of small filter units which are fitted in pipelines for removal of fine particles or traces of solid material which may have by-passed a larger filter unit.

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