Purification of elemental sulphur
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United States of America Patent
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Apr 4, 1995
Grant Date -
N/A
app pub date -
Apr 4, 1991
filing date -
Jun 5, 1989
priority date (Note) -
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Abstract
A process for removing mercury or other metal impurities from elemental sulphur contaminated therewith includes mixing such elemental sulphur in a molten state with an aqueous sulphide solution or an aqueous solution of sufficiently high pH which reacts with elemental sulphur and forms a sulphide solution to cause extraction of mercury or other metal contaminants from the elemental sulphur into the aqueous sulphide solutions, and separating the aqueous sulphide solution containing mercury or other metal contaminants from the molten elemental sulphur to provide an elemental sulphur product substantially free from mercury and other metal contaminants.
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