(September 2008)

MMS, through its Chilean Partners, Ingenieria de Minerales S.A. (IDM) has delivered two Imhoflot G-Cells type IMF-G-22 to Mineral Los Pelambres in Chile. The G-Cells are being used in parallel as second cleaners for producing a final molybdenum concentrate. The nominal throughput of the cells are 200 m3/h each but can operate in the range 160 m3/h to 280 m3/h. Minera Los Pelambres made the decision to install the G-Cells after running an Imhoflot pilot plant to test their performance. The trial was so successful in increasing grade and recovery that the pilot unit was incorporated directly into production until the full size cells could be installed. An advantage of Imhoflot is that with its high selectivity in rejecting insolubles a final molybdenum concentrate can be produced without an additional cleaning stage. The G-Cell has other particular advantages when floating molybdenum. The extremely short residence time in the cell reduces the consumption of the reagent NaSH. The self-sucking nature of the aeration unit made it easy to feed low pressure nitrogen as fine bubbles into the system with excellent bubble distribution. The ability to make the cell gas tight means that when floating in such a medium gas losses are dramatically reduced. The Cells and the entire system including the feed tank and discharge collecting boxes are sealed with Perspex and connected via a gas pendulum pipe so that nitrogen losses can be avoided and the gas recycled. Imhoflot offers great flexibility with high availability in an industrial flotation circuit and can quickly remove grade material, especially in the ultra fine size range, to final concentrate. The G-Cells at Los Pelambres are producing concentrate with over 50% Mo (Cu in range 2%-3%) with improved molybdenum recovery.

Schematic of Imhoflot G-Cell Plant at Los Pelambres

Schematic of Imhoflot G-Cell Plant at Los Pelambres

 

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G Cell Circuit First Cleaner End Concentrate Los Pelambres