Method for treating process streams containing cyanide and heavy metals
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United States of America Patent
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Nov 30, 1993
Grant Date -
N/A
app pub date -
Jan 30, 1992
filing date -
Jan 30, 1992
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Abstract
An apparatus and method for treating streams containing cyanide, heavy metal and precious metal values to recover those values where the method includes the following steps: a) providing a membrane filtration means having an inlet, a product outlet and an discharge outlet, b) contacting the waste stream to be treated with an effective amount of carbon dioxide to adjust the pH to about 8.0 to about 10.0, c) further contacting the waste stream with an effective amount of a soluble metal compound to react with the cyanide in the waste stream to form membrane rejectable cyanide compounds, and d) passing the treated stream through the membrane filtration means to thereby separate recoverable cyanide and precious metal values from the treated stream and produce an effluent stream for further processing or discharge to the environment.
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