Coal Age

JAN 2013

Coal Age Magazine - For nearly 100 years, Coal Age has been the magazine that readers can trust for guidance and insight on this important industry.

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dewatering continued wear. It also facilitates faster dewatering. The membrane press consists of chamber plates with concave interiors that create the compartment for the slurry to form a filter cake. The chamber press uses pressure from a two stage feed pump to fill the chambers with the appropriate pressure to dewater the slurry. With this style, the feed pressure to the system is the only 38 www.coalage.com dewatering tool. Depending on the design, the feed pressure is determined by the desired moisture content of the filter cake. Unlike the chamber press that uses only chamber plates, the membrane filter press uses alternating chamber and membrane plates. This membrane plate is a flat plate that inflates during a "squeeze" cycle, placing additional pres- sure on the solid/liquid material. The membrane press uses a single stage slurry pump to fill the plates to the desired pressure. When the correct pressure is reached, the feed will stop and the membrane plates will be inflated with air, which presses the material in the chamber to the final filter cake. After looking at the data received from the competing manufactures, Midland Trail Energy's Blue Creek Operation decided to use the Tons Per Hour/Jingjin 2-m x 2-m x 40-mm quickopening automatic membrane filter press. Tons Per Hour worked in conjunction with Conn-Weld Industries and Taggart Global to construct the plate and frame system. It was designed to process the entire 85-tph stream of dry solids of the thickener underflow. Tests concluded that one membrane press would be able to produce a 25% moisture product at 60 tph; with two presses the circuit could produce 120 tph of filter cake. Accounting for the filter cakes' 25% moisture, the two presses could process 90 tph of 2.155 density dry solid material. Below are the calculations used to verify these assumptions: January 2013

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