Performance Evaluation of Micronized-Magnetite Cycloning as a Function of Key Operational Variables, Research Report

摘要

In 1997, Custom Coals International completed a DOE contract to test the Micro-Mag Process at the continuous bench-scale at DOE's National Energy Technology Laboratory (NETL). As a follow up to these tests, NETL conducted two series of tests to confirm the Custom Coals results and to expand upon the effects of key operational variables on cyclone performance when using magnetite that is finer than conventional Grade E magnetite. This report details the results of batch tests in which the variables were magnetite size, medium density, cyclone orifice sizes, and inlet pressure. The results show that fairly sharp separations (about 0.060-0.090 Ep) can be achieved on coal as fine as 48 x 500 mesh if magnetite that is only about twice as fine as Grade E is used at higher inlet pressures (greater than 20 psi) with the right combination of cyclone orifice sizes.