Electrochemical cover for inhibiting diffusion/infiltration of oxygen into reactive sulphide materials
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United States of America Patent
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Mar 15, 2005
Grant Date -
Dec 19, 2002
app pub date -
May 17, 2002
filing date -
Nov 24, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Acidity in water leaching from a mass of sulphide tailings is prevented by de-oxygenating the water prior to entering the mass. A cover comprising an electrolytic cell, either galvanic or impressed-current, gives rise to a cathode reaction in which the redox voltage of the water drops to 003 volts or less. The cover can be thinner, and much less expensive, than an equally-effective non-reactive cover. The electrolyte is water contained in water-retaining soil, or a depth of water, lying over the cathode. The cathode is steel mesh, or a layer of graphite, spread over the whole mass of tailings.
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