A LAUNDER ARRANGEMENT, SETTLING TANK AND A PROCESS FOR REMOVING SURFACE FROTH

摘要

A launder arrangement for removing surface froth from a mixture in a settling tank, said launder arrangement including: a first launder adapted to be located near an upper surface of the mixture and having an entry point for receiving surface froth from the mixture, and a launder outlet for removal of said surface froth; a second launder, having inlet means for receiving liquid from the mixture, and outlet means for removing liquid from the second launder, said inlet means being positioned lower than the entry point of the first launder; and baffle means for inhibiting surface froth from entering the second launder. A settling tank for separating a mixture of solids and liquids including a launder arrangement as described above. A process for removing surface froth from the settling tank described above, including adjusting the surface of the mixture or liquid to a height (or maintaining it at a height) level with or slightly above the entry point of the first launder; allowing surface froth to overflow into the first launder; allowing liquid to pass from the mixture into the tank outlet means; and removing surface froth from the first launder.