1. Potential resources from coal fly ash;Watson;Mater. Res. Soc. Symp. Proc.,1985
2. C.J. McKenny, B.W. Raymond, Coal flotation process, US Patent 5,443,158, 1995.
3. W.-W. Wen, M.L. Gray, K.J. Champagne, Method for simultaneous use of a single additive for coal flotation, dewatering, and reconstitution, US Patent 5,379,902, 1995.
4. D.J.A. McCaffrey, J.P. Sheppard, Froth flotation, US Patent 4,528,107, 1985.
5. High-temperature chlorination of coal ash in a fluidized bed: 1. Recovery of aluminum;Mehrotra;Ind. Eng. Process Des. Dev.,1982