Method for preparing a precoat on the surface of the filter medium of a polishing filter, polishing filter and use of a polishing filter
AssigneeOutotec (Filters) Oy
InventorsLeena Tanttu, Janne Kauppi, Yrjo Oinonen
Life of this patent
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Abstract
Methods and equipment for preparing a precoat on the surface of a filter medium of a polishing filter. A feature in the invention is that in the polishing filter, the precoat is formed either exclusively or jointly from the underflow created in the separation process.
Claims12
A method comprising forming a precoat on the surface of a filter medium of a polishing filter, where the precoat is at least partially formed of the underflow of at least one of a thickener and a clarifier, where the precoat serves as a filter aid medium in polishing filtration of the overflow of said at least one of a thickener and a clarifier, where particles of the filter aid medium created by the precoat formed of the underflow serve as seed crystals, where particles contained in a supersaturated solution of the overflow are crystallized, and where the precoat is formed of essentially the same material as that to be filtered from the supersaturated solution of the overflow.
A polishing filter having a filter medium comprising a precoat, where the precoat is at least partially formed of the underflow of at least one of a thickener and a clarifier, and where the precoat serves as a filter aid medium in polishing filtration of an overflow of said at least one of a thickener and clarifier, where particles of the filter aid medium created by the precoat formed of the underflow serve as seed crystals, where particles contained in a supersaturated solution of the overflow are crystallized, and where the precoat is formed of essentially the same material as that to be filtered from the supersaturated solution of the overflow.
Dependencies are inferred from the claim text.