Apr 19, 2019 Extraction of copper from suitable ore by leaching methods is generally assumed to cost less than the combined expense of concentration, smelting, and refining, and experimental data tend to confirm this opinion. At the Butte-Duluth plant, which is handling in excess of 100 tons of oxidized ore daily, the copper is said to cost $0.085 per pound.
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US1282415A US127915A US127915A US1282415A US 1282415 A US1282415 A US 1282415A US 127915 A US127915 A US 127915A US 127915 A US127915 A US 127915A US 1282415 A US1282415 A US 1282415A Authority US United States Prior art keywords solution tank ore acid series Prior art date 1915-01-09 Legal status (The legal status is an assumption and is not a legal conclusion.
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Nov 01, 2012 Trans. Nonferrous Met. Soc. China 22(2012) 2822−2830 Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong 1, 2 , YIN Zhou-lan 1 , HU Hui-ping 1 , CHEN Qi-yuan 1 1.
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The low grade African copper oxide ore is leached in ammonium carbonate solution decomposing to ammonia during heated. The effects of particle size of copper ore, concentration of ammonium carbonate, solid-to-liquid ratio, leaching temperature, leaching time and stirring rate on leaching effectiveness are investigated.
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Direct leaching process of copper oxides or complex ores attracts considerable scientific and engineering attention, which plays an important role in the sus-tainable development of copper industry. Sulphuric, hydrochloric and nitric acid, as well as the ammonia are usually used as the leaching agents in a various copper ore leaching processes ...
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Sulfide ores. Secondary sulfides – those formed by supergene secondary enrichment – are resistant to sulfuric leaching.These ores are a mixture of copper carbonate, sulfate, phosphate, and oxide minerals and secondary sulfide minerals, dominantly chalcocite but other minerals such as digenite can be important in some deposits.. Supergene ores rich in sulfides may be concentrated using ...
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4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour
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Jan 26, 2021 The paper discusses methods of processing copper-containing molybdenite concentrates. A process flow diagram based on roasting with sodium chloride (or carbonate) and subsequent water leaching is presented. The chemistry of sulfide interaction with salt additives is described. The effect of the roasting temperature on copper and molybdenum distribution among the
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The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium hydroxide ...
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Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different ...
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Oct 01, 2019 The copper contents in the solutions was from 22 to 26 grs/l. The iron contents in ferrous ions fluctuated between 2 and 5 grs/l, the highest figures corresponding to the starting solution. Washing of the Solutions. The solutions from
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May 23, 2017 The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of
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Apr 01, 2020 An interesting process to treat mixed copper sulfides-oxide is the leaching-precipitation-flotation (LPF) sequence. The treatment begins with an acid leaching amidst a pH 1–2, followed by precipitation at pH 3–3.5, which is fixed with lime to avoid unnecessary iron consumption.
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Nov 01, 2011 Refractory copper ores (CROs) in central Africa contain copper minerals that are locked up in a micacious solid matrix or associated with carbonate, sulfide and phosphate minerals. Several researchers have reported that the recovery of copper from CRO material by an acid-leaching process is not economically feasible, due to the presence of excess gangue-acid-consuming minerals such as
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In this context, El-Sheikh et al. [24] have proven a selective leaching of uranium from the poly-mineralized carbonate-rich latosol ore material of Abu Thor locality of southwestern Sinai, Egypt ...
More4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour
MoreA method of recovering of oxidized copper from limestone gangue ores in which finely ground ore is leached with a caustic solution with gentle agitation and heat in stages, pregnant caustic solution from a succeeding stage being used to leach ore in a preceding stage; the ore in the final stage is leached with a copper barren caustic solution with gentle agitation and heat; copper sponge ...
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Heap leaching: It refers to a process which extracts uranium, copper and many other precious metals from their ores. In-situ leaching: It is a process which recovers uranium and copper. Tank leaching and vat leaching: They are the processes in which the ores are to be placed in vats or large tanks that consist of the leaching solutions.
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metallurgy - metallurgy - Leaching: Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid. Ammonium hydroxide is used for native ores, carbonates, and sulfides, and sodium hydroxide is used for oxides. Cyanide solutions are a solvent for the precious metals, while a sodium chloride solution dissolves some chlorides.
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The tests were completed when the leaching volume reached between 5 m 3 /t ore (leaching period: 60 days) and 10 m 3 /t ore (leaching period: 120 days). The columns for the conventional ferric leaching method (blank tests) were treated under the same conditions as the second stage of the JX Iodine Process during the entire test period.
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CN110819818A CN201911097444.0A CN201911097444A CN110819818A CN 110819818 A CN110819818 A CN 110819818A CN 201911097444 A CN201911097444 A CN 201911097444A CN 110819818 A CN110819818 A CN 110819818A Authority CN China Prior art keywords gold leaching ore pretreatment refractory Prior art date 2019-11-12 Legal status (The legal status is an assumption
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b) Dump Leaching c) Heap Leaching d) Vat Leaching. Answer: b Clarification: Dump leaching involves uncrushed waste rock which is piled up. It is an industrial process to extract rare metal ores or copper. This process is similar to heap leaching but in case of
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Mar 25, 2017 For the copper oxide necessary in this work we have used high-grade copper carbonate ore, oxide formed by the roasting of cement copper, roasted high-grade sulphide ore, also roasted copper sulphide concentrates. In our demonstration plant (10 tons daily capacity of carbonate ores) we used roasted concentrates.
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Effect of leaching temperature on th e recovery of copper from the malachite ore. (Ammonia concentration: 5M NH 4 OH + 0.3 M(NH 4 ) 2 CO 3 , particle size: -150 + 100 µ m, weight of ore: 25 g,
MoreApr 01, 2020 An interesting process to treat mixed copper sulfides-oxide is the leaching-precipitation-flotation (LPF) sequence. The treatment begins with an acid leaching amidst a pH 1–2, followed by precipitation at pH 3–3.5, which is fixed with lime to avoid unnecessary iron consumption.
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• Carbonate hosted copper • Oxide cap • Gold ore with nuisance copper ... economic process route exists: Copper ores Gold ores High acid consumption High cyanide consumption. 6 ... Heap Leach Process Concept Carbon adsorption Heap leach Stage 2 Heap leach Stage 1 Feed ore Agglom
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Copper Leaching Practices. The first large-scale leaching and precipitation of copper was probably at Rio Tinto in Spain about 1752. The method employed comprised open-air water leaching of weathered piles of copper-bearing ore followed by precipitation of the copper by iron. A description of leaching and precipitation of copper at Rio Tinto in ...
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Through earliest experimental study to tailings of Yangla copper ore known that under the best conditions of the flotation process can be obtained a copper concentrate which copper grade of 1.43% and recovery was 29.71%. Due to copper minerals embedded in this materials at a very fine particle size, and closely symbiosis with iron content and quartz, lead to it difficult to enrichment through ...
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Most of the copper ores mined today are oxide or sulfide ores. Extraction of sulfide ores is covered in more detail in Copper Mining and Extraction: Sulfide Ores (11–14), but is introduced here because an important by-product of this process is used for the extraction of oxide ores. Pyroprocessing Sulfide Ores Provides Acid for Leaching
MoreHydrometallurgical Extraction of Copper and Cobalt from Oxidised Copper-Cobalt Ore Using Ammonia Solution. Seliee Thabane 1166813 A dissertation submitted to the Faculty of Engineering and the Built Environment at the University of Witwatersrand, Johannesburg, in part-fulfilment of the requirements for the degree of Master of Science in ...
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Uranium ore deposits which contain certain proportions of other metals and elemental components, such as are present in redox roll front ore deposits, are selectively leached in situ by passing therethrough relatively dilute aqueous leach solutions comprising essentially from about 0.5 to 5 grams per liter of ammonium bicarbonate and from about 0.1 to 3 grams per liter of peroxide, preferably ...
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A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous solution of an alkali cyanide or alkaline earth cyanide, the laden solution is filtered, if desired, a water-soluble sulfide compound is added to the laden solution or filtered ...
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from various sources. The oxide and carbonate ores of copper, such as tenorite (CuO), malachite (CuCO3Cu(OH)2), and azurite (2CuCO3Cu(OH)2) are readily soluble in ammonia-containing solutions. In ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into
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Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing minerals on the kinetics of Cu and Ag leaching from low-grade copper concentrates. The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium-carbonate ...
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