Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
United States Patent : US5536297 : Gold Recovery from Refractory Carbonaceous Ores by Pressure Oxidation and Thiosulfate Leaching
Author: Extraction of Gold from Carbonaceous Ores
Author: Publisher:
ISBN:
Category : Extraction (Chemistry)
Languages : en
Pages : 28
Book Description
Oxidation procedures based on the chlorine-hypochlorite system were investigated for improving gold recovery from carbonaceous gold ores. The oxidation pretreatment prior to cyanidation was accomplished by (1) addition of sodium hypochlorite to ore pulp, (2) by addition of chlorine to ore pulp, and (3) by generation of hypochlorite in situ by electrolysis of a brine solution used to pulp the ore. Gold extraction of 90 pct was achieved by cyanidation of carbonaceous ore that had been pretreated with 20 lb per ton sodium hypochlorite at 50° C for 4 hours. Similarly, pretreatment of the ore pulp with 35 lb chlorine per ton at 24° to 30° C and 15 hours reaction time resulted in 89-pct gold extraction by subsequent cyaanidation. Concomitant studies showed that electrolyzing the pulp prepared with a brine solution was equally as effective as electrolyzing hypochlorite and chlorine for oxidizing carbonaceous ore constituents that are deleterious to cyanidation. Gold extraction of 90 pct was obtained by electrolysis when 275 lb of ore was treated at 200 amp for 7 hours in an 8- to 10-pct salt solution. Power consumption was in the range of 60 kwhr per ton.
A Process for the Recovery of Gold from Activated Carbon by Leaching and Electrolysis
Author: J. B. ZadraUnited States Patent : US5013359 : Process for Recovering Gold from Refractory Sulfidic Ores
Author: Gold
Author: Nathaniel ArbiterPublisher: CRC Press
ISBN: 9782881243974
Category : Business & Economics
Languages : en
Pages : 242
Book Description
The eight articles first appeared as volume 6 (no date) of Mineral processing and extractive metallurgy review. They review new methods of recovery for gold, and to some extent, silver, focus on the particular challenges of extraction from carbonaceous ores and from various sulfide-bearing ore, and the treatment of refractory gold ore, and discuss high-temperature and biological oxidation, high- temperature chlorination, and removing metals from leach liquor. Book club price, $40. Annotation copyrighted by Book News, Inc., Portland, OR
United States Patent : US5246486 : Biooxidation Process for Recovery of Gold from Heaps of Low - Grade Sulfidic and Carbonaceous Sulfidic Ore Materials
Author: Electrolytic Oxidation of Carbonaceous Ores for Improving Gold Recovery
Author: Bernard J. ScheinerPublisher:
ISBN:
Category : Carbonate minerals
Languages : en
Pages : 20
Book Description
United States Patent : US5147617 : Process for Recovery of Gold from Gold Ores Using a Complexing Pretreatment and Sulfurous Acid Leaching
Author: United States Patent : US4038362 : Increasing the Recoverability of Gold from Carbonaceous Gold-bearing Ores
Author: Processing Gold Ores Using Heap Leach-carbon Adsorption Methods
Author: Harold J. HeinenPublisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 32
Book Description