A descriptive mathematical model is a valuable tool that can help understand the relationship between the heap leaching process at the Escondida mine in Chile, the microbial community that participates in the process, and the physical characteristics of the heap, such as the arrangement and the mineral composition of the individual leaching strips.
a CASE STUDY: BACTERIAL CYANIDE DETOXIFICATION DURING CLOSURE OF THE GREEN SPRINGS GOLD HEAP LEACH OPERATION by R. H. Lien and P. B. Altringer Bureau of Mines Salt Lake City Research Center 729 Arapeen Drive Salt Lake City, Utah 84108
Geotechnical engineering for heap leach operators Krishna P. Sinha, KPS and Associates, USA Mark E. Smith, Brazilian Nickel Ltd, USA Omar Y. Caceres, Brazilian Nickel Ltd, USA Abstract The authors present a geotechnical primer especially oriented to heap leach operators, as well as geotechnical engineers new to heap leaching.
Jun 15, 2004· Bacterial oxidation activity in heap leaching The surveys of production process and the bacterial oxidation activity in the heap bioleaching were investigated. The results show that pH value is high, bacteria biomass and ferric concentration are low, generation time (above h) is long in leachate, and less bacteria are adsorbed on the ores.
The bacterial activity inside the heap has been proven vital for the process of extraction of copper. The bacteria were first found to form naturally within the heap. However, now through research, the mining industry has been able to manipulate bacterial growth and in turn manipulate copper extraction levels.
Heap leaching is percolation leaching of lowgrade gold and silver ores that have been stacked in engineered heaps on specially constructed pads. ... pH, temperature (which affects reaction kinetics), bacterial metabolism, photodegradation, and 38 aeration. If sufficient time is allowed, natural processes will return heap leach material to ...
• Acquisition of active bacteria cultures (acidithiobacillus ferrooxidans) to facilitate biooxidation. Growth of bacteria in 9K base medium (using essential salts with potassium, nitrogen, magnesium, phosphorus, and additional ferrous sulfate) along with airsparging for numerous leaching tests. • Monitoring of redox potential to check the
In bacterial leaching, it provides oxygen to bacteria. 17. ... Closure of the Sterling Mine Heap Leach Pad Pete Kowalewski Closure of the Sterling Mine Heap Leach Pad Pete Kowalewski, Vector Nevada, ... "REVIEW ON HEAP LEACHING OF COPPER ORES" is the property of its rightful owner.
Leaching. Heap leaching, an industrial process to extract metals from ore which has been crushed into small chunks Tank leaching, a hydro metallurgical method of extracting valuable material from ore Insitu leaching, a process of recovering minerals such as copper and uranium through boreholes drilled into the deposit Leaching (pedology),...
heap, which helps to promote bacterial oxidation reactions in the heap. The air lines are the same or similar as those used for drainage, namely 100mm slotted drainage pipe. These are installed during stacking across the face of the heap at a height of 1 m above the surface and at 2 m centers. For the oxide ore, no aeration is needed and just the drainage pipes are installed.
Bacterial oxidation activity in heap leaching 下 载 在线阅读 收 藏 导出 ... 摘要： Bioleaching of sulfide minerals by bacteria, mainly Thiobacillus ferrooxidans (T. f. ) and Thiobacillus thiooxidans, plays an important role in hydrometallurgy because of its econo ...
Apr 04, 2006· A method for the bacterially assisted heap leaching of chalcopyrite includes providing a chalcopyrite containing ore heap to oxidize sulphide minerals therein, the heap containing and/or being inoculated with a sulphide oxidizing bacterial culture that either does not oxidize ferrous to ferric, or is inefficient at doing so.
Together with dump leaching of mine waste, heap leaching contributes about 20% of annual world copper production (Watling, 2006). The leaching of several lowgrade ... the bacterial activity and the chemical environment in the heap (du Plessis et al., 2001). In
Estimated Water Requirements for Gold HeapLeach Operations By Donald I. Bleiwas Introduction This report provides a perspective on the amount of water necessary for conventional gold heapleach operations. Water is required for drilling and dust suppression during mining, for
Bacterial Leaching Biotechnology in the Mining Industry Preston Devasia and K A Natarajan Bacterial leaching is the extraction of metals from their ores using microorganisms. Microbial technology offers an eco nomic alternative for the mining industry, at a time .
The leach liquor collected at the bottom of the ore used for metal extraction. III) Heap Leaching In heap leaching the ore is arranged in heap and goes through the same treatment such as in slope leaching. The aqueous solution containing microorganisms works on the heap of ore and produces the leach liquor. The leach liquor is used for metal ...