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Dissolution of Iron from Oxides in a Solution of Citric ...

In this work, the dissolution of iron from a kaolinitic mineral (Veracruz, México) is compared with that from an iron ore (Michoacán, México), a specular hematite (México), a magnetite (southeastern Utah, USA) and a hematite (from Arizona, USA), using sodium thiosulfate and citric acid, as the reducing and complexing agents, respectively.

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Effects of alkali solution on the dissolution kinetics and ...

The dissolution process kinetics and optimization of iron from Akwuke ore were investigated in this study. The effects of process parameters such as agitation rate and ore particle size on the dissolution process were also examined. The Akwuke ore was characterized employing the XRD, FT-IR, SEM, and UV-spectroscopy. The results from the rate constants …

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Chapter 6 Copper Production Technology

been from ore first discovered by the Remans.3 At Rio Tinto, the Remans mined the upper, ox-idized, part of the ore and collected the copper-Iaden solutions produced by water slowly seep-ing down through the suIfide ore bodies. When the Moors conquered this part of Spain during the Middle Ages, the oxide ores had largely been exhausted.

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[PDF] Dissolution Kinetics of Ilmenite Ore in A Binary ...

Abstract A kinetic study of the leaching of powdered ilmenite ore by hydrochloric acid has been investigated. The effects of (a) stirring speed ranging from 100 to 500 min −1, (b) particle size…. The dissolution kinetics of cerussite was investigated using methanesulphonic acid (MSA) as an alternative leaching reagent.

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Chapter 5 Kinetics of Mineral Dissolution

dissolution rates in order to promote quantitative prediction of the evolution of our environment (Stumm, 1997). In this chapter, we discuss many of the concepts and models used to predict mineral dissolution rates for oxide, carbonate, and silicate minerals. 5.1.2 Steady-State Dissolution In general, for dissolution of a mineral AυA BυB ...

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The influence of ferric iron on the dissolution of copper ...

The influence of ferric iron on the dissolution of copper from lump oxide ore: Implications in solution mining. Hydrometallurgy, 15: 93--112. The dissolution of copper from the polished faces of lumps of ore containing mal- achite, cuprite, azurite and chrysocolla is …

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The Analysis of Dissolution Reaction Mechanism of ...

The Analysis of Dissolution Reaction Mechanism of Antigorite, Goethite, and Nickel Oxide from Laterite Ore in Chloric Acid Solution Solihin Research Center for Geo Technology, Indonesian Institute of Science,Komplek LIPI, Jl. Sangkuriang, Bandung 40135, Indonesia E-mail id: [email protected]

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Metal Flux from Dissolution of Iron Oxide Grain Coatings ...

Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone-hosted ore deposits. Median compositions of 37 samples, mostly of …

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Experimental and simulation study of copper recovery ...

Abstract Aspen Plus software was used to simulate and measure the recovery efficiency of copper in leaching process of copper oxide in H2SO4 solution. The Taguchi experimental design method was applied to determine the optimum operating conditions for dissolution of copper oxide ore in H2SO4 solution. The experimental variables and their …

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Extracting copper from copper oxide ore by a zwitterionic ...

Sulfamic acid (SA), which possesses a zwitterionic structure, was applied as a leaching reagent for the first time for extracting copper from copper oxide ore. The effects of reaction time, temperature, particle size, reagent concentration, and stirring speed on this leaching were studied. The dissolution kinetics of malachite was illustrated with a three …

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Leaching and solvent extraction purification of zinc from ...

The optimum alkaline leaching conditions of 5% NaOH, temperature 90 to 95 °C in 90 min was obtained for leaching zinc from an oxide ore 17. The column leaching of low grade zinc oxide ore containing 5.2% zinc using ammonium sulphate was carried out …

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Studies on the Dissolution of Platinum and Palladium from ...

The mineralogy and extractive metallurgy of platinum and palladium in ores and residues is examined and the relative reactivity of Pt, Pd, PtS and PdS in cyanide and chloride media at 20C is discussed. Electrochemical measurements establish that Pd is readily leached in chloride media but more slowly in cyanide media due to a passivating PdO film. The passivating oxide …

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Extracting copper from copper oxide ore by a zwitterionic ...

10%Sulfamic acid (SA), which possesses a zwitterionic structure, was applied as a leaching reagent for the first time for extracting copper from copper oxide ore. The effects of reaction time, temperature, particle size, reagent concentration, and stirring speed on this leaching were studied. The dissolution kinetics of malachite was illustrated with a …

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US3787301A - Electrolytic method for producing high-purity ...

a method for recovering nickel from nickel containing ores comprises: lixiviating the ore in sulphuric acid and neutralizing the resulting solution until it reaches a ph between 3.5 and 4; adding to said solution a precipitation agent to obtain a nickel hydroxide precipitate; dissolving said precipitate in a slight excess of sulphuric acid, and removing the dissolution residue; …

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Experimental and Kinetic Modeling Investigation of …

10%Abstract In the present work, the leaching behavior of copper from an oxide/sulfide ore was assessed in two work phases including process optimization and kinetics modeling. In the first phase, the individual and synergistic impacts of the influential parameters such as sulfuric acid concentration, liquid/solid ratio, pulp mixing rate, …

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SciELO - Brasil - LEACHING OF MALACHITE ORE IN AMMONIUM ...

The oxide and carbonate ores of copper, such as tenorite (CuO), malachite (CuCO 3 Cu(OH) 2), and azurite (2CuCO 3 Cu(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 the ...

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Copper Extraction from Oxide Ore of Almalyk Mine by H2SO4 ...

The present study investigated the leaching behavior of Cu from its oxide ore throughout a weeklong (7 days) experiment using different sizes of ore particles, mimicking the heap environment. A series of experiments were conducted to check the dissolution of metals during the leaching process.

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EP2397443A3 - Method of dissolution of thorium oxide ...

Method of dissolution of thorium oxide, according to the invention is that the process of dissolution of thorium oxide is carried out in concentrated trifluoromethanesulfonic acid and/or its aqueous solution at a temperature above the temperature boiling acid. In the present invention, an aqueous solution of trifluoromethanesulfonic acid with concentration in range from 30 to …

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The Dissolution of Zinc Oxide Ore in Sulfamic Acid ...

In this study, the dissolution effect of zinc oxide ore was investigated using sulfamic acid solution as leaching agent. The effects of temperature, concentration of sulfamic acid, average particle size and stirring speed on the dissolution of zinc oxide ore were investigated. The dissolution rate increased with increasing solution temperature, concentration, and stirring …

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Kinetics of Manganese Oxides Dissolution in Sulphuric Acid ...

The kinetics of the interaction of MnO2, Mn2O3, and Mn3O4, with sulphuric acid solutions and the effect of oxalic acid on this process are studied. As the sulphuric acid concentration is increased from 0.1 to 5 N, the dissolution rate of Mn2O3, Mn3O4 to MnO2 and Mn2+ ions decreases, whereas it increases with the concentration of Mn2+ ions. Upon the addition of H2Ox, the …

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A comprehensive study of the leaching behavior and ...

dissolution of copper oxide ore. ratio of 10 mL/g is found to be optimal for leaching of copper using H2SO4. This can be explained in a way that the leaching agent is in excess of the calculated amount for the extraction of copper. After 75 min of dissolution, the amounts of copper extracted from the oxide ore were 57.37, 74.73, and 66.71% at L ...

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Recovery platinum group metals from oxides ores - BHP ...

Dissolution tests were conducted on an oxide ore, namely, the Hartley oxide ore mined at the Hartley site in Zimbabwe referred to hereinabove. The chemical composition of this ore in the natural and the roasted state is given in following Table 1 below. The oxide ore in the natural state is designated as NOX-C and in the roasted state as NOXR-C.

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LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN …

The concentration of citric acid was found to have an important role in low-grade zinc oxide ore dissolution, maximizing at 1 M, and a zinc leaching efficiency of about 81.2% was obtained, under the following leaching conditions: ammonia 6 M, temperature of 25 °C, leaching time of 60 min, stirring speed of 300 rpm and solid to liquid ratio of 1:5.

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The Role of Chemolitotrophic Bacteria in an Oxide Copper ...

oxide/sulfide copper ores (Acevedo and Jentina, 1993; Sen et al., 1993). No considerations were taken for the biological operation part while Sarcheshmeh copper heap was constructing. Copper sulfide minerals are insoluble or partially soluble during the time (about 75 days) considered for dissolution of copper oxide ores,

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A Brief Introduction to Copper Oxide Ores | Fote Machinery

A Brief Introduction to Copper Oxide Ores. As the world's demand for copper continues to grow, the resources of primary copper sulfide ore that are easy to mine and beneficiate have gradually decreased. It's urgent to explore and utilize copper oxide ore resources to mitigate the shortage of copper resources. The more you know about the copper ...

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Model for Evaluation of the Concentration of Dissolved ...

input of iron oxide ore that gives the maximum dissolution of Fe 2O3. The model also indicates that the concentration of haematite dissolved during the leaching process is directly proportional to the final pH of the leaching solution and inversely proportional to the …

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13 SAMPLE DISSOLUTION - EPA

Dissolution of radium from some ores depends on the exchange of anions associated with the radium cation (sulfate for example) to generate a soluble compound. Extraction with nitric acid is partly based on this process, generating soluble radium …

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A comprehensive study of the leaching behavior and ...

The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper.

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Extracting Copper by Lactic Acid from Copper Oxide Ore and ...

Extracting Copper by Lactic Acid from Copper Oxide Ore and Dissolution Kinetics. ... In this study, an organic reagent was used as a leaching reagent for copper extraction from copper oxide ore. The effects of several factors, including leaching time, temperature, particle size, reagent concentration, and stirring speed, on leaching of the ...

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Leaching and solvent extraction purification of zinc from ...

The zinc oxide ores usually contain several different minerals including zincite (ZnO), ... The main advantages of alkaline leaching are lower iron dissolution and lack of silica gel formation 16.

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Oxide - Wikipedia

An oxide (/ ˈ ɒ k s aɪ d /) is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O 2– (molecular) ion. Metal oxides thus typically contain an anion of oxygen in the oxidation state of −2. Most of the Earth's crust consists of solid oxides, the result of elements being oxidized by the ...

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Heap Leaching Oxide and Sulfide Copper Ores

Ore and Gangue Mineral Types – The ore minerals chrysocolla and malachite responded to leaching in much the same manner. The rates of dissolution were such that it generally took 4 to 8 days to reach the ultimate economic recovery on a minus ½-inch ore, regard¬less of the type of oxide mineralization present.

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Dissolution Kinetics of Zinc Oxide Ore with an Organic Acid

Dissolution Kinetics of Zinc Oxide Ore with an Organic Acid Jiushuai Deng *, Quanwei Sun, Peijia Lin, Guojun Song, Shuming Wen, ng Deng and Dandan Wu * State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, PR China

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