Process for the removal of mercury from precious metal-cyanide liquors
Patent
·
OSTI ID:5099724
A process for removing mercury from a cyanide solution is described comprising: (a) reacting solubilized mercury with a sulfide ion-providing compound in a precious metal-containing, cyanide leach solution to produce mercuric sulfide, the sulfide ion-providing compound being a member selected from the group consisting of sodium sulfide, sodium hydrosulfide, and hydrogen sulfide; (b) flocculating the mercuric sulfide with a flocculating agent, the flocculating agent being an anionic, high molecular polyacrylamide polymer, whereby flocs of mercuric sulfide are formed to produce a mercury-free precious metal-containing, cyanide solution; and (c) separating the mercuric sulfide flocs from the mercury-free precious metal-containing, cyanide solution.
- Assignee:
- NOV; NOV-88-007082; EDB-88-104379
- Patent Number(s):
- US 4726939
- OSTI ID:
- 5099724
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACRYLATES
ALKALI METAL COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CYANIDES
DISSOLUTION
ELEMENTS
FLOCCULATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LEACHING
MERCURY
MERCURY COMPOUNDS
MERCURY SULFIDES
METALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYAMIDES
POLYMERS
PRECIPITATION
RECOVERY
REMOVAL
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM SULFIDES
SOLUTES
SULFIDES
SULFUR COMPOUNDS
400201* -- Chemical & Physicochemical Properties
ACRYLATES
ALKALI METAL COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CYANIDES
DISSOLUTION
ELEMENTS
FLOCCULATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LEACHING
MERCURY
MERCURY COMPOUNDS
MERCURY SULFIDES
METALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYAMIDES
POLYMERS
PRECIPITATION
RECOVERY
REMOVAL
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM SULFIDES
SOLUTES
SULFIDES
SULFUR COMPOUNDS