Coal slurry stabilization
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United States of America Patent
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Issued Date -
May 13, 2004
app pub date -
Aug 25, 2003
filing date -
Jan 25, 2002
priority date (Note) -
Abandoned
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Abstract
A process for the treatment of an aqueous coal slurry obtained as tailings from a coal treatment plant and containing fine mineral particles comprises adding to the slurry at least 0.2% of a binder and an amount of dispersant effective to reduce the viscosity and facilitate settling of solids, the % being based on the combined weight of water and mineral solids and allowing the solids to settle. The binder is preferably a cementitious material such as a finely divided blast furnace slag and an activator for the binder such a hydrated lime or Portland cement is preferably also included. The dispersant may be a polyarcylate, polycarboxylate or lignosulphonate.
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