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dump leaching iron

dump leaching iron

dump leaching iron
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Dump leaching Wikipedia Dump leaching is an industrial process to extract precious metals and copper from ores Dump leaching is similar to heap leaching, howev

dump leaching iron

  • Dump leaching Wikipedia

    Dump leaching is an industrial process to extract precious metals and copper from ores Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, in the case of gold and silver, the dump is irrigated with a dilute cyanide solution that percolates through the ore to dissolve gold and01/01/1987· The only reason why the dump leaching practices are economically successful is that a large tonnage of lowgrade ores are subject to dump leaching 3+ 2++ 180 DUMP LEACH OPTIMIZATION The above discussions on the role of iron in heap and dump leaching dictates that the heaps and dumps should be designed and constructed to provide optimum conditions for aeration andROLE OF OXYGEN IN DUMP LEACHING ScienceDirect01/10/2010· During the initial stages of the commercial leaching the pH of the recycled solutions usually was maintained below 20 to avoid the undesirable iron precipitation within the dump Regardless of this, the pH in some zones was much higher (even about 30) which was connected with the formation of iron precipitates These precipitates retained a part of the dissolved copper Leaching testsChanges in an ore dump during a 40year period of

  • Bioleaching: metal solubilization by microorganisms | FEMS

    01/07/1997· There are three main procedures in use: dump leaching, heap leaching and underground leaching Figure 4 Open in new tab Download slide Flow sheet of a dump and in situ leaching process Figure 4 Open in new tab Download slide Flow sheet of a dump and in situ leaching process 521 Dump leaching Dump leaching is the oldest process The size of the dumps varies considerablySome literature on the water potentials in copper leach dumps is reviewed, and it is concluded that control of water potential is essential to maximize the success of leaching operations Because adequate drainage is necessary in a leach dump to ensure sufficient aeration, in many cases water availability in leach dumps may restrict the development of the bacterium necessary for the processEffect of Water Potential on Growth and Iron Oxidation byThere are three main procedures in use: dump leaching, heap leaching and underground leaching Figure 4 Open in new tab Download slide Flow sheet of a dump and in situ leaching process Figure 4 Open in new tab Download slide Flow sheet of a dump and in situ leaching process 521 Dump leaching Dump leaching is the oldest process The size of the dumps varies considerably and theBioleaching: metal solubilization by microorganisms |

  • How Contaminants Leach Out of Landfill Waste and Into

    12/08/2011· Ferrous salts are more soluble and thus iron leaches from the landfill Another means how contaminants leach is via the sulphate in the tip may be biochemically reduced to sulphides, although this may lead to evolution of small quantities of hydrogen sulphide, the sulphide will remain in the landfill as highly insoluble metal sulphides (iv) Washed out Fines and Colloids Suspended solids andpresence of iron sulphides, this oxidation process is enhanced by natural biological activity (biooxidation) under acidic conditions Leaching is a physicochemical process where minerals in rock masses go through dissolution under percolating water and anion/cation exchange reactions to generate metal salts in solute/colloid phase that migrate and accumulate under hydrological forcesHEAP LEACHING TECHNIQUE in MINING29/11/2019· This, in effect, requires that the key controllable variables, which have an impact on the recovery of the metal and the quality of solution coming from a dump leaching process The process has ancient origins; one of the classical methods for the manufacture of copperas (iron sulfate) was to heap up iron pyrite and collect the leachate from the heap, which was then boiled with iron to produceHeap Leaching: Is it something that could be an

  • (PDF) THE ART OF HEAP LEACHING | Lee JOHN

    Insitu Leach (ISL) (Under Ground) 2 Dump Leach (DPL) (Run Of Mine ore) 3 Heap Leach (HPL) (Crushed and or Agglomerated ore) 4 Vat Leach (VTL) (Ore or Concentrates) 5 Agglomerated Fines Heap Leach (AFHL) (Ore or Concentrates) The types of percolation leaching commercialised are tabulated below with a summary of the applications Page 21 The Southern African Institute of MiningIron consumption varies from 1 to 4 lbiron per pound of copper Preconcentration of the copper in the efliuent solution by solvent extraction followed by electrolysis may become a useful methodApplication of dump leaching techniques to metals other than copper depends on finding an economic method of recovering the metal from solution1967224Woodcock | AusIMMIron consumption varies from 1 to 4 lb iron per pound of copper Preconcentration of the copper in the efliuent solution by solvent extraction followed by electrolysis may become a useful method Application of dump leaching techniques to metals other than copper depends on finding an economic method of recovering the metal from solutionCopper Waste Dump Leaching AusIMM

  • Bioleaching SlideShare

    27/12/2018· History The role of bacteria in bioleaching was found in 1947 In 1950 copper dump leaching was found First industrial gold bioleaching plant in 1980 7 8 8 GENERAL PROPERTIES OF MICROORGANISMS Chemolithotrophic( rock eating) Autotrophic Acidiphilic ( acid loving) 9 9 Principles of Microbial Metal leaching • Mineralytic effects of bacteria and fungi on minerals are mainly based onThe raffinate generated at hydrometallurgical plants is typically stored in ponds and recycled to the dump leaching operation As a result, it does not become a waste until after the closure of the mine Following mine closure, spent leaching solutions must be disposed of 3 Energy Primary copper production is a major activity in the mining sector It is highly energyintensive, ranking thirdCopper production & environmental impactSome literature on the water potentials in copper leach dumps is reviewed, and it is concluded that control of water potential is essential to maximize the success of leaching operations Because adequate drainage is necessary in a leach dump to ensure sufficient aeration, in many cases water availability in leach dumps may restrict the development of the bacterium necessary for the processEffect of Water Potential on Growth and Iron Oxidation by

  • Dump leaching WikiMili, The Free Encyclopedia

    26/03/2019· Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, in the case of gold and silver, the dump is irrigated with a dilute cyanide solution that percolates through the ore to dissolve gold and silver The solution containing gold and silver exits the base of the dump, is collected12/08/2011· Ferrous salts are more soluble and thus iron leaches from the landfill Another means how contaminants leach is via the sulphate in the tip may be biochemically reduced to sulphides, although this may lead to evolution of small quantities of hydrogen sulphide, the sulphide will remain in the landfill as highly insoluble metal sulphides (iv) Washed out Fines and Colloids Suspended solids andHow Contaminants Leach Out of Landfill Waste and Intoiron replaces copper in solution, and this ironrich solution is subsequently recycled to the top of the leach dump Upon exposure to the atmosphere, the dissolved iron oxidizes to form insoluble salts, which precipitate on surface of the dump and restrict the flow of solution Solvent extraction uses a complexation mechanism whereby copper is chelated; the copper is then stripped from organicCopper Dump Leaching and Management Practices that

  • Copper Dump Leaching and Management Practices That

    Th iron replaces copper in solution, and thi ironrich solution is subsequent! recycled to the top of the leach dum| Upon exposure to the atmosphere, th dissolved iron oxidizes to form insolubl salts, which precipitate on the surface c the dump and restrict the flow of solutiot Solvent extraction uses a complexatio mechanism whereby copper is chelatec the copper is then stripped from thDump leaching involves uncrushed waste rock which is piled up These dumps generally contain about 0105% copper, too low to recover profitably by conventional procedures Some of these dumps are huge, containing in excess of 10 million tons of waste rock Heap leaching requires the preparation ofBacterial LeachingInsitu Leach (ISL) (Under Ground) 2 Dump Leach (DPL) (Run Of Mine ore) 3 Heap Leach (HPL) (Crushed and or Agglomerated ore) 4 Vat Leach (VTL) (Ore or Concentrates) 5 Agglomerated Fines Heap Leach (AFHL) (Ore or Concentrates) The types of percolation leaching commercialised are tabulated below with a summary of the applications Page 21 The Southern African Institute of Mining(PDF) THE ART OF HEAP LEACHING | Lee JOHN

  • Studies on the curing and leaching kinetics of mixed

    Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents An enriched solution containing the targeted metal is collected at the bottom This technique involves complex chemical/electrochemical reactions and transport processes Among the main features of this methodLeaching tests further confirmed the high reactivity of the mixed dump as high extraction rates were obtained for iron, with the maximum iron extraction efficiency of 9537% reported at 100 °C, 25 M, and 25 h The carbon dioxide sequestration potential of the mixed dump was reported as the amount of CO2 that can be sequestered per amount ofEnergies | Free FullText | Determination of the Carbon27/12/2018· History The role of bacteria in bioleaching was found in 1947 In 1950 copper dump leaching was found First industrial gold bioleaching plant in 1980 7 8 8 GENERAL PROPERTIES OF MICROORGANISMS Chemolithotrophic( rock eating) Autotrophic Acidiphilic ( acid loving) 9 9 Principles of Microbial Metal leaching • Mineralytic effects of bacteria and fungi on minerals are mainly based onBioleaching SlideShare