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 Alumina
Hydrocyclones are used in many alumina refineries to enhance classification efficiency. A partial list of applications includes bauxite grinding, bauxite refinement, sands separations from red muds, sand washing, hydrate classification and product size control, seed size control, hydrate thickening and deliquoring, agglomeration, preferential separation/reduction of oxalates, spent liquor solids recovery, cooling tower water clean-up and lime slurry degritting.
The most common applications are sands separation from red muds and the various duties in the hydrate classification and debottlenecking area.
The versatility of hydrocyclones suggests they may be suitable problem solvers in many applications and this must be determined by a step-by-step evaluation. Every plant's problems and objectives are unique and hydrocyclones may be the solution or a function in a combination of solutions. Because solutions are tailored to meet the individual plant and operating conditions any cost indication at this stage would be misleading. Nevertheless, hydrocyclones are definitely a low cost investment item. Other advantages of this equipment and its application are high efficiencies and outstanding flexibility combined with simple operation and maintenance but without any special space or installation requirements. Hydrocyclones may be the answer to some of the plant's problems and could increase the plant's competitive potential even under the present tight situation.
Plant operators unfamiliar with hydrocyclones recognize that hydrocyclones are dynamic equipment, seemingly with more unknowns than conventional equipment. Overcoming uncertainty is usually accomplished by close cooperation with FLSmidth Krebs as an innovative hydrocyclone supplier offering experience and value in proving benefits, thorough testing, optimum equipment design, suitable controls, maintenance implications and an appreciation of the limits of performance.
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