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MEI Online: Control & Instrumentation: Latest News: April 8th 2002

:: Level Control From Lakefield  

According to Lakefield Research Ltd, reliable level control is critical to achieving consistent metallurgical performance in mill flotation circuits. However, the company says that, thus far, the poor performance of level-sensing equipment has frustrated the efforts of metallurgists to optimise milling circuits. Lakefield says that its new flotation-level transmitter (FLT) will now provide mill metallurgists with a simple, reliable, robust and cost-effective means of monitoring levels and thus achieving flotation-circuit optimisation.

The FLT has a standard measurement range of 0-50 cm and has both 4-20 mA and 0-10 V DC outputs. To eliminate the build up of solids on its float unit, the FLT features a continuous washing system. Lakefield says that the FLT has been installed at a Canadian concentrator that has a history of level-control problems. In the past ultrasonic and differential pressure techniques have been used to try to ensure that the froth is maintained at a depth of only 5 cm at the discharge end of the bank of cells. But the extremely dense and heavily loaded nature of the froth at the feed end has meant that the attempts at level control were unsuccessful.

Lakefield notes that since the installation of the FLT the concentrator has been using reliable, automated level control for almost a year.



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