The ferric/ferrous ratio controls the relative rate of the oxidation reactions involved in the process. Additionally, the leaching rate of pyrite is controlled by the pH. The phase analysis of products indicated that S2 2oxidation can produce S0 and SO2
The thermodynamic properties of copper minerals suggests that oxidized porphyry copper deposits would tend to be rich in chrysocolla, tenorite, coppermanganese silicates, cuprite, delafossite, and various members of the chalcocite series.
Extraction of Tin and Copper by Acid Leaching of PCBs. Abstract; Reference; FullText PDF; Buckle and Roy investigated thermodynamic analysis of coppernitratewater system and tinnitratewater system . If pH is greater than 12.6 in very alkaline conditions tin is found to exist as a dissolved species.
Predicting Cyanide Consumption in Gold Leaching A Kinetic and Thermodynamic Modeling Approach. leaching conditions. For example, Adams iron and copper leaching and cyanide for this system
The effect of particle size on the rate of the copper leaching was also investigated, and it was shown that the copper bioleaching rate decreases as the amount of fines increase, which limits the permeability, thus decreases leaching rate.
Download Citation on ResearchGate The thermodynamic chemistry of the aqueous copperammonia thiosulfate system A fundamental thermodynamic study was undertaken in order to establish the speciation of copper(I) and copper(II) during the leaching and recovery of gold from thiosulfatecopperammonia solutions.
IN OXIDATIVE LEACHING PROCESSES D Pugaev, M Nicol, G Senanayake A J Parker Cooperative Research Centre for Hydrometallurgy Murdoch University, Perth, WA 6150, Australia 1. Abstract A number of sulfide minerals of copper, nickel and iron can only be effectively leached by methods that require elevated temperatures in acidic solutions.
May 22, 20120183;32;leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria taken an active part in the process.
The acquired thermodynamic characteri stics of leaching of the copper concentrate with nitric acid can be used when selecting the production parameters for processing the copper concentrates. Keywords Sulfide concentrates, nitric acid leaching, ther modynamic characteristics, production parameters.
Thermodynamics processes of nitric acid leaching 1791 3 Results and discussion To determine the most probable conditions of formation of the desired Joint diagram of copper, zinc and iron in the nitric acid existence during oxidation of sulphides (figure 2) allows to predict the behavior of all the main
This paper proposes a robust methodology to estimate leaching cyanide consumption due to oxidation and reactions with gold, chalcopyrite and pyrite minerals forming various cyanide complexes, cyanate, thiocyanate and hydroxide precipitates of copper and iron.
leaching by oxygenated sulfuric acid and mechanistic considerations, Hydrometallurgy (2009), doi 10.1016/j.hydromet.2009.02.010 This is a PDF le of an unedited manuscript that has been accepted for publication.
Predicting Cyanide Consumption in Gold Leaching A Kinetic and Thermodynamic Modeling Approach Yaser Kianinia 1, Mohammad Reza Khalesi 1,*, thermodynamic data covering the range of conditions (ionic strength, temperature, and species) of copper and gold leaching from pure minerals and mixtures, and determining the
At hightemperature pressure leaching conditions, the formation of sulphuric acid from sulphides in the ore is favoured, however at medium and lowtemperature conditions required for the copper leaching process (Dreisinger, 2006). Leach reactors are operated at atmospheric pressure near the boiling point of the slurry. The leach
these conditions are greatly increased rates of reaction, favorable displacement of thermodynamic equilibria and the possibility of using certain gaseous or highly volatile reagents (Pehlke, 1975). examinations on goldcopper acid leaching studies were also reported (Mendes et al., 2003). Mathematical
Bacteria assisted leaching (bacteria leaching) is also used for the leaching/upgradation of ores (ex. U, Cu, bauxite etc). Depending upon nature of leaching system (means mode of contact of solidliquid, pressure, temperature, stirring), wide variety of leaching systems are available to carry out leaching reaction, e.g.
However, by use of the model one can predict an upper limit for copper extraction from a leach dump because the model describes leaching under ideal conditions of adequate air flow and constant temperature.
Transformation of SeleniumContaining Phases in Copper Anode Slimes During Leaching XUE JIAO LI,1 HONG YING YANG,1,2 ZHE NAN JIN,1 GUO BAO CHEN,1 and LIN LIN TONG1 1.School of Metallurgy, Northeastern University, Shenyang 110819, Peoples Republic of China.
A fundamental thermodynamic study was undertaken in order to establish the speciation of copper(I) and copper(II) during the leaching and recovery of gold from thiosulfatecopperammonia solutions. Despite considerable research into this complex leaching system, the lack of important fundamental chemistry has delayed the implementation of the
investigated. The initial rate of copper dissolution from enargite was relatively fast up to about 40% copper extraction but this was followed by a much slower dissolution rate. The first stage is thought to be reaction rate controlled while the latter stage appears to be diffusion controlled.
Thermodynamic Modelling of Iron Solubility in Sulphide Mineral Leaching Authors Pauliina Nurmi, Lasse Ahonen, Olli H. Tuovinen Abstract In this study the effects of pH and temperature on iron solubility were predicted using the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F.
Leaching of Cadmium, Tellurium and Copper from Cadmium Telluride Photovoltaic Modules Progress Report February 3, 2004 W. Wang and V.M. Fthenakis Thermodynamic information on tellurium  and cadmium has shown the following cadmium is soluble in acid media, and insoluble in neutral and
Thermodynamic analysis of gold leaching by ammoniacal thiosulfate using Eh/pH and speciation diagrams the conditions under which various copper and sulfur species are stable. with copper
The process of copper matte leaching under high pressure conditions, in both acidic and alkaline solutions, necessitates high capital and operation costs. Sullivan (1933) studied the leaching processes of copper sulphides
The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted within 3.0 hours.
When the cyanidetocopper molar ratio drops to 2.5 and a large proportion of copper is present as Cu(CN) 2 , the gold leaching rate is extremely low . This suggests that Cu(CN) 3 2 can provide sufficient cyanide ions for the leaching of gold or other minerals according to Equation (9) [ 18 ].
copper matte leaching under high pressure conditions, in both acidic and alkaline solutions, necessitates high capital and operation costs. As early as 1933, Sullivan  showed that, in an acidified ferric sulphate
copper naphthenate, resistance to leaching is provided by the hydrophobic properties of the carrier oil, although there are indications that a portion of the copper also binds to the
There are two main leaching methods heap leaching and insitu leaching. Heap leaching is the most common method used in the U.S. When processing copper through heap leaching, vast quantities of ore and overburden overburden Soil and rocks that have been moved out of the way to get to ore are called quot;overburden.quot;
New Developments in the Atmospheric and Pressure Leaching of Copper Ores and Concentrates David Dreisinger Ag often forms Agjarosite under copper leaching conditions. May have to use lime boil to Rapid and complete copper leaching
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