Patent ID: 7334689

Claim:
An overflow launder for a separation cell of the type wherein particles rise to a surface of a fluid in the cell and overflow into the launder, including: two or more primary troughs located adjacent to the surface of the fluid in the cell; and one or more secondary troughs extending across an upper portion of the fluid in the cell such that fluid containing particles overflows into said one or more secondary troughs and drains along said one or more secondary troughs into one or more of said two or more primary troughs, wherein one or more of said secondary troughs extend across the cell from one said primary trough on one side of said cell to a second primary trough on an opposite side of said cell, such that fluid can drain from either end of said one or more secondary troughs into one or more of said primary troughs, and each of said one or more secondary troughs includes a raised internal portion at an intermediate position in the respective said secondary trough for enabling fluid to drain to an end of the respective said secondary trough and into an adjacent said primary trough.