Abstract
A study of coal washing spiral operation and performance is under way at the JKMRC. The program has two components—a pilot plant study, and sampling programs conducted in operating washeries. The objective is to use the pilot plant data to develop a fundamental understanding of the spiral separation process, and to formulate a model of spiral performance which can be subsequently validated and extended by the incorporation of field data. The first series of pilot plant and field results are described, which validated the use of synthetic feedstocks to simplify the testing and analytical procedures. An empirical model of a particular spiral profile is presented. A fundamental analysis was subsequently undertaken of the forces and mechanisms occurring during the spiral separation process, and results from the current series of pilot plant tests demonstrated the validity of this approach. Both the pulp behavior (pulp profile and flow rate) and coal particle position on the spiral profile can be accurately pr...
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