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    The experimental work on the oxidized copper ore at the New Cornelia mine at Ajo, Ariz, ended on Jan 12, 1916 On that date final decision was made on the general nature of the process to be used in the 5,000ton leaching plant, and on many of the

  • Pilotscale plant study on the innovative nitric acid

    In the pilot tests, the leaching reactions were performed using an agitated 25 m 3 vertical titanium autoclave (Fig 2a)All the precipitation reactions and nitric acid regeneration reactions were performed in agitated 100 m 3 tanks (Fig 2b) Fig 2c and d show the panoramic image of the leaching plantFour absorption towers were installed in a series, and a reactor for NO oxidation was also

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  • High Pressure Acid Leach Caldera Engineering

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    The DNi ProcessTM utilises nitric acid leaching under atmospheric conditions The pilot plant used a ratio of 25 tonnes 100% equivalent acid for every dry tonne of ore under a leach residence time of 4 hours These were the same assumptions utilised in the Pre Feasibility Study Leach extractions of

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  • Sulfuric Acid – NORAM Engineering and Constructors

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    A pilot plant was prepared to remove copper from ACQ and CAtreated wood wastes using a sulfuric acid leaching process (Coudert et al, 2013b) The leaching process consists of three acid leaching steps, followed by three water rinsing steps These steps were carried out in a 130 L capacity 316stainless steel tank

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  • Successful Pilot Plant Campaign Provides Confidence to

    The DNi ProcessTM utilises nitric acid leaching under atmospheric conditions The pilot plant used a ratio of 25 tonnes 100% equivalent acid for every dry tonne of ore under a leach residence time of 4 hours These were the same assumptions utilised in the Pre Feasibility Study Leach extractions of

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  • Hydrometallurgical Process an overview |

    The Rio Tinto company [60] developed a process on the pilot plant scale for acid oxidation leaching in the normal conditions of pressure and temperature using ferric sulphate as the oxidation agent for various sulphate minerals of copper present in lean complex ores, especially chalcocite, covellite, enargite and

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