Raw syrup can contains particles of insoluble solids which cause elevated turbidity of the liqour and these solids must be removed before crystallisation. A flotation clarifier achieves this well without much cost. Air bubbles are entrained in the liquor by means of an aerator, polyelectrolite as floculent is added in an inline mixer and the liquor is then fed to the flotation clarifier. The liquor flows up the expanding riser to reduce the velocity and hence turbulence. The liquor overflows the riser and enters the clarifing section of the vessel. The entrained air bubbles rise and carry with them the particulate solids which have have been flocculated and formed into a scum by the polyelectrolite. Slowly rotating rakes push the scum to the outer periphery of the clarifier and into the scum launder. The clarified liquor flows out of the clarifier through equally space outlet nozzles into a ring header. The liquor flows into an adjustable weir box which can be adjusted manually (or automtically if required) to maintain the scum level.
The Sugar Engineeers' flotation clarifier design is based on the designs and experience of 30 years in the sugar industry. The design will be rapidly implememted using state of the art tools, inlcuding 3D CAD and computation fluid dynamic analysis (CFD).
The features of the Sugar Engineeers' flotation clarifier are: