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Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution. Leaching gold from sulfide ores is difficult, at best. Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30%, which is not a worthwhile venture.
Low-grade refractory sulphide gold ores exist in which the gold values are too low to economically justify the use of pre-concentration processes. The pre-concentration process (usually flotation) is followed by the oxidation of the sulphidic concentrate to render the gold amenable to a subsequent cyanide leach.
Nichromet both has a process that uses chloride and bromide to leach gold from refractory ores high in sulphides. I also suggest you look at papers by Dr. Corby Anderson that use alkaline sulfide leaching to extract gold from refractory ores. The latter can be run at .
A bacterial-assisted heap leach process is employed for the solubilization of a metal from a refractory ore containing fines and/or clay wherein at least a portion of the metal is solubilized by the bacterial oxidation of sulfides and the concomitant or sequential dissolution of the metal into a leaching solution. For some metals, the leaching solution has a pH of greater than about 9.
Gold in sulfide minerals could be liberated by oxidization using techniques such as roasting, high temperature pressure leaching or bacterial leaching. Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides.
ising for the biological leaching of refractory gold- and silver-bearing sulfide concentrates. 32-35 Au- riferous sulfide ores contain primarily pyrite and arsenopyrite as the main sulfide minerals. The biotechnological fundamentals of the bi- ological leaching of arsenopyrite and pyrite are complex because they involve many poorly
Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery.
common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For refractory ores such as sulfide ores and carbonaceous ores which are not susceptible to direct cyanide leaching, various
Advances in high-temperature heap leaching of refractory copper sulphide ores conditions for bacterial activity in the heaps. Specially designed column tests are required to simulate the natural dynamic temperature behaviour in a large-scale heap, by .
Heap bio leaching is the process to extract precious metals like gold, silver, copper and uranium from their ore by placing them on a pad (a base) in a heap and sprinkling a bacterial leaching ...
After 24 h leaching rate at pulp density of 33%, gold leaching agent dosage of 2 kg/t ore, the gold extraction for NaCN, green gold leaching agent and thiourea were 91.50 %, 86.23 % and 91.09 %, respectively. The high gold extraction showed a bright future for the whole-ore heap biooxidation of this refractory gold ore.
The application of heap leaching to more refractory chalcopyrite material is still under development. Figure 1 – Relationship between ore grade and method of recovery During sulphide heap leaching, bacterial activity can be utilised to catalyse the oxidation of iron, which acts as an electron carrier between the mineral and oxygen for
HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND TREATMENT OF REFRACTORY SULPHIDE ORES In the last two decades a considerable number of new hydrometallurgical processes have been developed and implemented in gold industry allowing the economical treatment of increasingly complex and lower grade ores as well as refractory ores.
Bacterial heap leaching of refractory gold/sulphide ores ... Gold recovery in alkaline cyanide heap leaching after bacterial leaching was 74 % (compared with 24 % without bacterial heap leaching), but the acid consumption to achieve this recovery was very high at . Get price
Oct 30, 2013· The economic extraction of copper from low-grade ores requires low-cost processing methods such as in situ, dump and heap leaching. Bacterially assisted heap leaching of low-grade copper sulphides is a developing technology that has been applied successfully for the extraction of copper from secondary sulphide minerals such as chalcocite at a ...
Gold and Silver Leaching Today's microbial leaching of refractory precious metal ores to enhancegold and silver recovery is one of the most promising applications. Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process. Silver is more readily solubilized than gold during microbial leaching of iron sulfide.
Bacterial leaching of ores and other materials R. Näveke, Institut für Mikrobiologie, Technische Universität Braunschweig, Fed. Rep. Germany : Summary In nature sulfidic ores are decayed by weathering under the influence of oxygen and water. Microbiological investigations reveal that certain bacteria are the main agent in this process.
Bacterial leaching is an established method of treating refractory gold and base metal ores or concentrates. SGS Minerals Services has undertaken testing for numerous projects for flowsheet ... • (Heap or thin layer leaching of low grade flotation concentrates)
Bacterial heap leaching of refractory gold/sulfide ores. Min Eng 1994; 7: 619–631. ... Bacterial copper heap leach followed by heap leach recovery of gold at Mt. Leyshon Gold Mine. In: Biomine '84. ... Brierley J.A. (1997) Heap Leaching of Gold-Bearing Deposits: Theory and Operational Description. In: Rawlings D.E. (eds) Biomining ...
Bacterial Leaching as a Pre-treatment Step for Gold Recovery from Refractory Ores Article (PDF Available) in Physicochemical Problems of Mineral Processing 32:173-181 · March 1998 with 756 Reads
Both oxide and sulfide ores can be leached, though the leach cycles are much different and sulfide leaching requires a bacterial, or bio-leach, component. In 2011 leaching, both heap leaching and in-situ leaching, produced 3.4 million metric tons of copper, 22 percent of world production.
Moreover, progress in reactor design and kinetics of the process made the adoption of biooxidation, as a pretreatment to cyanidation, in the extraction of gold from refractory sulphide-bearing ores and concentrates. The existence of biooxidation plants in different parts of the world is showing the economical viability of the process.
In biooxidation of refractory gold ores bacteria are used to oxidize, and therefore make soluble, an iron sulfide matrix in which the gold particles are imbedded and thus make the gold available for cyanide leaching.
FOR GOLD RECOVERY FROM REFRACTORY ORES In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bio-leaching and bio-heap leach processes. The examples of
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