Process for the removal of mercury from precious metal-cyanide liquors

Patent · Tue Feb 23 00:00:00 EST 1988

OSTI ID:5099724

Touro, F J

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
• Resource Relation: Patent File Date: Filed date 23 Dec 1985
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CYANIDES
FLOCCULATION
MERCURY
RECOVERY
ACRYLATES
HYDROGEN SULFIDES
LEACHING
MERCURY SULFIDES
POLYAMIDES
POLYMERS
REMOVAL
SODIUM SULFIDES
SOLUTES
SULFIDES
ALKALI METAL COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
DISSOLUTION
ELEMENTS
HYDROGEN COMPOUNDS
MERCURY COMPOUNDS
METALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PRECIPITATION
SEPARATION PROCESSES
SODIUM COMPOUNDS
SULFUR COMPOUNDS
400201* - Chemical & Physicochemical Properties