2/1/1994 · The nitric acid using processes (NITROX, REDOX, ARSENO) are among the new concepts as lower pressure alternatives for pretreatment of refractory gold ores. High pressure oxidation of refractory ores and concentrates seems to be the preferred method of pretreatment today [6,7].

11/28/2016 · The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical

What is mining pressure oxidation?

To compare process routes and recoveries, pressure oxidation can completely breakdown the sulphides and then achieve high gold recoveries, maybe greater than 95%. Where as with the Leachox process and the partial oxidation, depending on the nature of the mineralogy, recoveries in the range 80% to 90% can be expected.

Bio-oxidation, as treatment of refractory ores that contain low grade of gold, offers an economic and sustainable alternative for The results after the cyanidation tests showed that the highest gold recovery was obtained when the bio-oxidation step was conducted

18. The process as claimed in claim 5, wherein the gold content of the first type of refractory sulfidic mineral having high gold content is above 8 ppm. 19. The process as claimed in claim 5, wherein the gold content of the first type of refractory sulfidic mineral having high gold content is between 10 to 100 ppm. 20.

Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

Gold in sulfide minerals could be liberated by oxidization using techniques such as roasting, high temperature pressure leaching or bacterial leaching. SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE METATES GOLD PROJECT EXPERIENCE 203 Gary Parkison, Chesapeake Gold Corp, (Canada); Art Ibrado, M3 Engineering and Technology (USA); Grenvil Dunn, Nelson Mora, Yong Yong Teo, Orway Mineral Consultants (WA) Pty Ltd (Australia) SPECIAL ASPECTS OF CONTINUOUS PRESSURE OXIDATION OF DOUBLE REFRACTORY

Both pressure oxidation and oxidation by nitric acid require high temperature and/or corrosion-resistant materials which are costly items. The biological pretreatment of refractory gold ores is based on the ability of some microorganisms such as