| BARRICK GOLD CORPORATION Patent applications |
| Patent application number | Title | Published |
|---|
| 20120128528 | ALKALINE AND ACID PRESSURE OXIDATION OF PRECIOUS METAL-CONTAINING MATERIALS - The present invention is directed to a precious metal recovery process in which an acid sulfidic feed material is subjected to acid pressure oxidation and an alkaline sulfidic feed material is subjected to alkaline pressure oxidation, with the discharge slurries from the pressure oxidation processes being combined to reduce neutralization requirements prior to precious metal recovery. | 05-24-2012 |
| 20110165059 | PRODUCTION OF ZINC SULPHATE CONCENTRATES FROM A DILUTE ZINC SULPHATE SOLUTION - In an embodiment, the present invention relates to an apparatus and a process for producing a concentrated form of basic zinc sulphate from a, typically dilute, acidic zinc sulphate-bearing solution. The process embodiment comprises the steps of precipitating the zinc, preferably primarily as basic zinc sulphate, from the acidic zinc sulphate solution, preferably using calcium oxide, in such a way as to promote the formation of separate gypsum crystals and basic zinc sulphate particles, and upgrading the zinc content in the precipitates by separating the basic zinc sulphate from the gypsum using size separation techniques. | 07-07-2011 |
| 20110155651 | SEPARATION OF COPPER MINERALS FROM PYRITE USING AIR-METABISULFITE TREATMENT - Embodiments of the present invention are directed to flotation of sulfidic materials following aerating by an oxidizing gas and contacting by a sulfoxy reagent. | 06-30-2011 |
| 20090158893 | MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES - The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. | 06-25-2009 |
| 20090074608 | PROCESS FOR MERCURY CONTROL DURING PRESSURE OXIDATION - A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predominantly in the solid residue. | 03-19-2009 |
| 20090074607 | PROCESS FOR RECOVERING GOLD AND SILVER FROM REFRACTORY ORES - The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates. | 03-19-2009 |
| 20090071296 | PROCESS FOR CONTROLLING ACID IN SULFIDE PRESSURE OXIDATION PROCESSES - The present invention is directed to flotation of refractory gold sulfide ores and to pressure oxidized residue neutralization using flotation tailings that have been contacted with an off gas of pressure oxidation. | 03-19-2009 |
| 20090071295 | METHOD TO IMPROVE RECOVERY OF GOLD FROM DOUBLE REFRACTORY GOLD ORES - The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal. | 03-19-2009 |
| 20090071289 | PROCESS FOR RECOVERING PLATINUM GROUP METALS USING REDUCTANTS - In the process of recovering platinum group metals from platinum group metal- and base metal-containing materials, the present invention uses reductants and a sulfur-deficient matte to aide the separation of the furnace matte from the furnace slag and therefore improve recovery of platinum group metals. | 03-19-2009 |
| 20080274026 | SELECTIVE PRECIPITATION OF METAL SULFIDES - A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide. | 11-06-2008 |
