专利名称：Process and apparatus for decantation of
suspensions
发明人：Bagatto, Peter Francis,Dancose, Bernard
Paul,Harrington, Pierre Charles,Jean, GastonMarcel,Lepage, Marc Aurele
申请号：EP90311049.2申请日：19901009公开号：EP0422893B1公开日：19930623
摘要：A process and apparatus are useful for decanting suspensions at temperaturesat and above the atmospheric boiling point of the liquid of the suspension. The apparatusis in the form of a vertically elongated vessel of high height to diameter ratio having acylindrical upper section (10) and a bottom section (12) and arranged to be filled to apredetermined liquid level (13) in an upper region of said cylindrical section; feed means(17) for feeding a suspension into the cylindrical section in a mid-region between thebottom of the vessel and said liquid level, said feed means including means for injectingthe feed under a positive pressure sufficient to overcome the hydrostatic head of theliquid in the vessel above the feed inlet; means (20) for adding a flocculant to thesuspension feed; liquid outlet means (14) in an upper region of the cylindrical section ator below said liquid level for drawing off clarified liquid; solids discharge means (30) atthe bottom of said vessel; means (22, 23) for controlling a slurry-clarified liquid interfaceat a predetermined level in a lower region of said cylindrical portion below the feed inletand rotatable rake means (24) in the bottom section adapted to remold the sedimented
solids and continuously expose renewed surfaces. It is particularly useful for clarifyingcaustic liquor containing red mud residues from the Bayer process.
申请人：ALCAN INTERNATIONAL LIMITED
地址：1188 SHERBROOKE STREET WEST; MONTREAL QUEBEC H3A 3G2
代理机构：Wilkinson, Stephen John
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