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leaching copper temperature

1 at 20 °C The comparison for each metal at the two temperatures appears in Fig 2a b and c for copper iron and lead respectively As may be expected from kinetics of heterogeneous reactions Smith 1981 Sohn and Wadsworth 1979 the leaching velocity decreases for  jaw crusher prospecting may in malaysia price

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  • leaching copper temperature

    The recoveries of copper from ores 1 and 2 tables 3 and 4 were 55 percent in 50 days of leaching and 45 percent in 45 days of leaching respectively The initial leaching rates figure 5 amounted to approximately 2 percent recovery per day for 14 or 15 days and then gradually dropped off to less than 05 percent per day

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  • leaching copper temperature

    Leaching Method The support rock itself may be a lowgrade copper ore The ratio of support rock to concentrate is in the range of 51 to 101 by weight The heap is inoculated with thermophilic bacteria and a process leach solution consisting of sulfuric acid ferric iron and nutrients is applied to the heap

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  • leaching copper temperature

    Mediumtemperature pressure leaching of copper concentrates Part II Development of direct electr owinning and an acidautogenous process Minerals Metallurgical Processing 24 4 205 – 217

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  • leaching copper temperature

    Heap leaching is an industrial mining process used to extract precious metals copper uranium and other compounds from ore using a series of chemical reactions that absorb specific minerals and reseparate them after their division from other earth materials

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  • leaching copper temperature

    Bioleaching Introduction Methods Application Copper Microorganisms and Processes Introduction to Bioleaching Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water This process was later on employed for recovering metals from ores containing low quantity of the metal Presently certain metals from sulfide ores and other ores are

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  • leaching copper temperature

    Abstract The leaching of dolomiticcopper ore using sulphuric acid under controlled conditions was studied with a view to evaluating the economic value and the effect of ore pulverisation particle size temperature and pH on the recovery of copper from chalcopyrite The samples were ground and mixed with water and sulphuric acid to form an acid

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  • leaching copper temperature

    During the conveying from the roasters to the leaching tanks this temperature is lowered to 40° C Leaching The leaching is done by continuous downward percolation no circulation or upward percolation being used The percolation rate will vary from 3 in per hour with the first solution to as high as 10 in per hour with the wash water

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  • leaching copper temperature

    Specific configurations of both processes have been commercially demonstrated at Phelps Dodge’s facility in Bagdad Arizona This paper reviews in detail the chemistry of mediumtemperature pressure leaching of copper concentrates and reports on the process development work conducted by Phelps Dodge and others for this technology

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  • leaching copper temperature

    The recoveries of copper from ores 1 and 2 tables 3 and 4 were 55 percent in 50 days of leaching and 45 percent in 45 days of leaching respectively The initial leaching rates figure 5 amounted to approximately 2 percent recovery per day for 14 or 15 days and then gradually dropped off to less than 05 percent per day

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  • leaching copper temperature

    The leaching reactor Figure 1 with a volume of 343 mL was equipped with a rotating perforated drum immersed in the leaching solution which contained the copper samples All experiments were performed over a period of 2 h at room temperature using waste copper wires of approximately 4 g

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  • leaching copper temperature

    For getting optimum uranium leaching the incoming air should passes a pH of 1535 temperature of 35°C and CO 2 02 However certain thermophilic strains require a temperature optimum of 4550°C

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  • leaching copper temperature

    view to evaluating the economic value and the effect of ore pulverisation particle size temperature and pH on the recovery of copper from chalcopyrite The samples were ground and mixed with water and sulphuric acid to form an acid soluble copper content of 407 814 total copper and 22 solids The leaching was carried in duration of 06 hours

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  • leaching copper temperature

    Jul 10 2017 · 4 Autoclave Leaching Higher temperature and pressure are used to enhance the rate of the reaction This aggressive method of leaching is typically used for ores and concentrates that are not amenable to atmospheric leaching such as sulphides

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  • leaching copper temperature

    Leaching tests on 25g batches of copper or nickel matte included varying amounts of manganese dioxide a 5hr reaction time a temperature between 90° and 95° C and 35 or 50 g of sulfuric acid in total solvent volumes of 100 or 200 ml for nickel and copper mattes respectively

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  • leaching copper temperature

    Mediumtemperature pressure leaching of copper concentrates Part II Development of direct electr owinning and an acidautogenous process Minerals Metallurgical Processing 24 4 205 – 217

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  • leaching copper temperature

    In heap leaching an appreciable amount of the copper in chalcopyrite may be extracted owing to the long period of contact with solutions and the possible rise in temperature of the ore during weathering

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  • leaching copper temperature

    The leaching experiments were performed using sulphuric acid solutions whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio The copper concentration in the leach solution ranged from 080 to 175 g dm3 The total Cu recovery rate ranged from 30 to 56 whereas the

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  • leaching copper temperature

    Aug 01 2008 · Typical copper extraction yields obtained by mesophilic bioleaching are around 30 whereas copper extraction yields of more than 90 can be obtained within much shorter periods by thermophilic bioleaching Konishi et al 1999 Regardless of the temperature the leaching of chalcopyrite can be represented by the following reactions

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  • leaching copper temperature

    Extraction and refining The second step involving either smelting or leaching removes a large proportion of impurity elementsin particular iron and in the case of sulfide ores sulfur The final step refining removes the last traces of the impurity elements and produces a

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  • leaching copper temperature

    Temperature is a critical factor controlling copper extraction in heap leaching • Raffinate temperature controlled heap temperature at high raffinate flow rates • Pyrite oxidation led to an increase in heap temperature at low raffinate flow rates • Application of a thermal cover had a positive effect on heap temperature

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  • leaching copper temperature

    This study was undertaken to develop a costeffective method of copper leaching in sulfide concentrate involving minerals as chalcopyrite and pyrite The combined methods involving low temperature roasting of sulfide copper minerals with potassium chlorides without the formation of sulfurous gases and their evolution into the atmosphere is suggested

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  • leaching copper temperature

    Copper hydrometallurgy is a branch of metallurgy method to extract copper directly from those difficulttoconcentrate copper oxide ore Traditional copper hydrometallurgy process typically consists of atmospheric leaching solvent extraction SX and electrowinning EW It can produce either copper cathode or copper sulphate crystal

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  • leaching copper temperature

    Although the leaching efficiency of chalcopyrite was very low at ambient temperature the percentages of copper dissolved in the presence of hydrogen peroxide H2O2 and ferric sulfate Fe2SO43

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  • leaching copper temperature

    This effort resulted in the development of hightemperature 200°C and mediumtemperature 150° to 165°C pressure leaching processes Specific configurations of both processes have been commercially demonstrated at Phelps Dodge’s facility in Bagdad Arizona

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  • leaching copper temperature

    Fleming 2009 At hightemperature pressure leaching conditions the formation of sulphuric acid from sulphides in the ore is favoured however at medium and lowtemperature conditions 150–165oC and 140oC respectively elemental sulphur formation occurs

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  • leaching copper temperature

    Typical leaching rates of copper oxide after four hours are 97 Assuming a rate expression in the form shown in Equation 3 a rate constant was found that would leach 96 to 97 of the copper

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  • leaching copper temperature

    The leaching of lead and copper from plumbing materials is a source of metals in drinking water and is a public health concern This work investigated the influence of free chlorine HOClOCl on the level of copper in water in contact with the solid metal and proposed an oxidationdissolution mechanism to explain copper leaching

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  • leaching copper temperature

    Leaching of copper oxide with different acid solutions It was found that 9995 of copper was dissolved after 14min with inorganic acids at 05M 25°C and ls10mlg while more drastic operation conditions were needed to reach the same dissolution efficiency with citric acid solution Anions seem to be involved in the surface reaction

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  • leaching copper temperature

    Bacterial leaching combined with SXEW offers a method of exploiting small ore bodies with a minimum of capital investment Most commercial operations leaching copper from ore dumps are located in the Southern Hemisphere in Australia Chile Myanmar and Peru

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  • leaching copper temperature

    Methods of leaching sulphide ores can be in absence of oxidizing agents in presence of oxidizing agents Bacterial leaching Absence of oxidizing agents Acid leaching Dilute acids dissolve some metal sulphides with liberation of H2S eg ZnS 2H Zn2 H2S Three types of sulphides can be encountered Completely soluble sulphides Zns CoS NiS FeS Slightly soluble eg FeS2

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  • leaching copper temperature

    The residue is removed A feed of matte and sulfide concentrate containing approximately 04 cobalt and 30 sulfur is pressure leached at elevated temperature and pressure in an ammoniacal solution to produce a solution of nickel copper and cobalt By boiling away the ammonia copper is precipitated as a sulfide and sent to a smelter

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  • leaching copper temperature

    Copper is not difficult to extract from it ores but mineable deposits were relatively rare Some such as the copper mine at Falun Sweden date from the 1200s were the source of great wealth One way to extract the metal was to roast the sulfide ore then leach out the copper

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  • leaching copper temperature

    Hence different leaching techniques for copper sulfide ores especially chalcopyrite need to be investigated in the future Presently the mining industry faces the challenge of extracting copper from lowgrade copper ores In 2002 the average copper ore grade was 113 while in

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