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The process is intended to transport fine refuse from preparation plants and power stations in the form of highly concentrated slurry through pipelines into the mine and to stow it in the goaf. In this way waste management problems in densely populated industrial areas may be solved. At the same time the stowing material can be used to avoid mining damage. First of all it was tested in model trials under which conditions EFA, tailings and crushed waste can be injected into loose debris without producing excess water. Prior to hydraulic conveying the solids have to be mixed intensively to reduce the viscosity as far as possible, thus minimizing the pressure loss in the pipeline. Tailings account for significantly higher pressure losses than EFA. In another test installation piston pumps with pressures of up to 70 bar and various auxiliary installations to reduce pressure peaks were tested. The tests showed that slurry pumping in the pipeline may be started again even after several days of standstill if an optimal solid concentration is chosen.

Additional information

Authors: STEINKOHLENBERGBAUVEREIN, Steinkohlenbergbauverein, Essen (DE)
Bibliographic Reference: EUR 11721 DE (1988)
Availability: (2)
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