leaching copper ammonia

  • pictures ammonia leaching of copper | Solution for ore mining

    Nov 06, 2012 · AMMONIA LEACH AND SOLVENT EXTRACTION FOR THE RECOVERY OF VALUABLE . The ammonia-ammonium carbonate leaching of roast-reduced polymetallicnodules analysing 1.175%copper, 1.625%nickeland. AMMONIA PRESSURE LEACHING FOR LUBIN SHALE MIDDLINGS. 180 oC evidently shown, that ammonia leaching temperature for copper can not ex-ceed 180 oC.

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  • The Leaching of Copper Oxide Ore in Ammonium Chloride Solution

    In this study, the leaching effect of copper oxide ore was investigated using ammonium chloride solution as leaching agent. The effects of temperature, concentration of ammonium chloride, average particle size and stirring speed on the leaching of copper oxide ore were investigated. The leaching rate increased with increasing solution temperature, concentration, and stirring speed as well as ...

  • Copper recovery using leach/solvent extraction ...

    compatible with the copper leaching process because it did not extract copper below pH~36. Technically this problem could be solved by neutralizing the acid leach liquor or by leaching oxide copper with ammonia, but neither solution was economical. a molecule that extracted copper well from typical dump leach liquors (pH ~1.8) had to be built. The

  • the plant of copper leaching with ammonia

    Popular Searches leaching of copper from tailings using ammonia- copper scrap leaching ammonia,The metal is very pure, containing from 98 to 99 92 per cent copper, with to employ ammonia leaching rather than sulfuric-acid leaching because of the large the copper and only copper and a tailing containing all the siliceous matter andAmmonia Leaching: A New Approach of Copper,Ammonia,

  • Silver sulfide leaching with a copper-thiosulfate solution ...

    Mar 26, 2011 · Silver sulfide leaching with a copper-thiosulfate solution in the absence of ammonia. It is shown that copper-to-thiosulfate ratio is an important factor in silver sulfide dissolution and oxygen is not needed to leach silver sulfide, which leads to the instability of the leaching system at high copper-to-thiosulfate ratio. On the other hand, the silver extraction is not affected by the pulp pH values.

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  • Kinetic Investigation and Dissolution Behavior of Cyanide ...

    May 10, 2019 · For gold extraction usually ammonium or sodium thiosulfate salts are used in an ammonia-copper leaching solution. Copper sulfate acts as a catalyst, while ammonia .

  • NICKEL MATTE CHLORIDE LEACHING

    aqueous solution with copper, cobalt, and nickel solvent extractions, and ammonium chloride is regenerated into ammonia. The water balance is controlled by evapora-tion after the ammonia regeneration. Calcium chloride is regenerated into hydrochloric acid and the solution is returned to leaching. In total, the leaching process takes

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  • Copper Recovery from Conglomerative-type Native Copper Ore ...

    To help maintain an adequate supply of minerals to meet national, economic, and strategic needs, the Bureau of Mines investigated the feasibility of extracting copper from coarse native copper ore with ammoniacal ammonium carbonate solution by a simulated in situ leaching procedure. A 5.9-Metric-ton ...

  • Final Report | Metals Recycling From Waste Sludges by ...

    Ammonia could be recycled for leaching purposes without the requirement of steam-stripping for its recycle, a potentially difficult and expensive step. Process economics show that the technology is only potentially attractive if considered as an alternative to an expensive sludge disposal option, such as a hazardous waste handler.

  • Cobalt extraction - Wikipedia

    By boiling away the ammonia; copper is precipitated as a sulfide and sent to a smelter. Hydrogen sulfide is added to the autoclave to remove nickel sulfide and copper sulfide which is fed back to the leaching process. Air is then passed through the solution in the autoclave for oxyhydrolysis.

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  • US4165264A - Ammonia leaching - Google Patents

    Ammonia leaching. In this process, the ammonium carbonate leaching solution is formed from carbon dioxide that is generated by: adding a metal carbonate to the leach liquor during the heating thereof; and recovering the gaseous carbon dioxide, as well as the gaseous ammonia, formed during the heating of .

  • Cobalt extraction - Wikipedia

    The calcine is subsequently leached with sulfuric acid from the spent copper recovery electrolyte. Oxide concentrates are introduced at this leaching step to maintain the acid balance in the circuit. Iron and aluminum are removed from the leach solution by the addition of lime, and copper is electrowon on copper cathodes.

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  • US4165264A - Ammonia leaching - Google Patents

    Ammonia leaching. In this process, the ammonium carbonate leaching solution is formed from carbon dioxide that is generated by: adding a metal carbonate to the leach liquor during the heating thereof; and recovering the gaseous carbon dioxide, as well as the gaseous ammonia, formed during the heating of .

  • Industrial Application of Ammonia Assisted Cyanide ...

    AMMONIA ASSISTED CYANIDE LEACHING 3.1 Previous Work The use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Bertram Hunt (Hunt 1902), during the first period of intense R&D activity in gold metallurgy that followed the invention of the cyanide process by J.S. MacArthur and the Forrest brothers in the late 1880s.

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  • Optimal Conditions for Ammonia Leaching of Copper ...

    copper, nickel and zinc [11]. Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The

    Author: Martin Y. Woode, Mike A. Acheampong, David Azanu
  • Kinetics of copper dissolution - Iowa State University

    Mineral and Metals, Inc. leaches scrap copper by a solution of ammonia, ammonium carbonate, and copper ammonium carbonate (37). Perhaps, leaching copper oxide ores treated with a preliminary reducing roast is economically feasible. Although leaching copper with ammonia is commercially applied, the nature of the reaction is not well understood. Several contradictions exist in the results of earlier .