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However, direct leaching of the concentrate results in poor gold extractions as the cyanide lixivant is unable to contact the gold locked or included within the pyrite. The traditional approach for such refractory material has been to liberate the locked gold by .
It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.
Apr 30, 2002· The present invention relates to microbiological processes for the oxidative treatment of refractory gold and base metal ores and concentrates, and specifically, to bacterial inoculums for use in such processes that are strongly resistant to thiocyanate toxicity. The present invention also relates to methods of developing and using these bacteria.
Refractory Ores: Oxidative Pretreatment Applied when direct treatment by cyanidation gives unacceptable low gold recovery or is uneconomic due to: Gold is locked in relative gangue minerals often sulfides and cannot be adequately liberated even by fine grinding Gold occurs with minerals that consume unacceptable
for a refractory gold ore ultrafine grinding resulted in a significant an improvement in gold extraction through fine grinding alone. many ores require oxidative Get Price how do i crush gold ore
new options to treat the refractory gold and silver ores. Since ozone is a strong oxidant, it may be regarded as a promising alternative in the treatment of refractory ores. Some research work has been done regarding the use of ozone in the mineral industry, mainly on the treatment of effluents containing cyanide (Mathieu, 1977; Rowley
Jun 25, 2009· This embodiment can provide an economical and practical method to treat not only refractory but also double refractory ores. In a second embodiment, a method is provided for treating refractory and double refractory goldcontaining materials containing sulfidic sulfur using a fungal agent to decompose sulfides.
Ultra Fine Grinding – A Practical Alternative to Oxidative . The use of UFG grinding in the minerals . scans such as QEMScan and MLA are able to give good data as .
The Chemistry of Gold Extraction bridges the gap between research and industry by emphasizing the practical applications of chemical principles and what everyone in the gold extraction and processing industries should know: Historical Developments; Ore Deposits and Process Mineralogy; Process Selection; Principles of Gold Hydrometallurgy; Oxidative Pretreatment; Leaching; .
preferred lixiviant for the leaching of gold from most ore types. There are generally two types of ores that are handled by a gold leaching operation; run of mine heap leach ore and millable grade ore. They again can be broken up to two additional types ores classified by mineralogy; oxide ore, and refractory ore.
These refractory ores are usually pretreated by some oxidizing process after which gold and silver can be recovered by standard cyanidation process. Since ozone gas (O3) is a strong oxidizing, it may be regarded as a promising alternative in the treatment of refractory ores.
Contents/Summary. Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation.
Ultra Fine Grinding A Practical Alternative to Oxidative ... IsaMill operated an ultra fine grinding (UFG) circuit to supplement its roaster capacity for the treatment of the refractory gold flotation concentrate.
Gold ore Gold is precipitated from cyanide solution using zinc powder Gold adsorbed on activated carbon from cyanide solution (CIC) Gold adsorbed on activated carbon from cyanide solution with solids. Adsorption take place in a separate stage (CIP) Gold adsorbed on activated carbon in slurry cyanide solution with solids. Adsoprtion takes place
implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA. The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded highgrade deposits.
Alternative methods of processing the refractory goldsulfide ores and concentrates were worked out. The goldcontaining refractory sulfide ores of chalcopyrite, pyrite, baritepolymetallic, quartzites, copperzinc, antimonite were used in the research. As a result of investigation, the optimal
