In this study, a combined process consisting of salt roasting and acid leaching was conducted to recover copper per sulphide concentrate with 43.5% of chalcopyrite.
WhatsApp: +86 18221755073The resulting mixture, called a copper concentrate, contains about 25-35% copper along with various sulfides of copper and iron, plus smaller concentrations of gold, silver, and other materials. The remaining materials in the tank are called the gangue or tailings. ... The chemical reactions in the converter are similar to those in the flash ...
WhatsApp: +86 18221755073copper recoveries can be made in the leach, the economic necessity of limiting oxidation of sulfur suggests that a multi-stage leach procedure recovering about 50 per cent per stage is …
WhatsApp: +86 18221755073In copper flash smelting, after the sulfide concentrate particles are ignited, the chemical kinetics of the chalcopyrite oxidation is very fast and the reaction is rate controlled by oxygen mass transfer to the particles, rendering the intrinsic kinetics of oxidation unimportant.
WhatsApp: +86 18221755073the CuS reaction is not included because its amount in the particles is negligible. In general, the reactions can be di-vided into three groups: primary decomposition reactions, secondary decomposition reactions, and oxidation reactions. Table 2. Chemical reactions of the flash furnace concentrate feed Type of reaction and temperature range / K
WhatsApp: +86 18221755073Often this occurs from excessive stirring, chemical reactions that create gas and disperse the metal, decreases in metal solubility with the slag, and operational actions such as charging and tapping . ... The goal of a TC is to reduce the amount of copper concentrate lost from the smelting process, whether from slag or off gas.
WhatsApp: +86 18221755073The leaching kinetics of zinc in copper concentrate was mainly controlled by chemical reaction, indicating that higher temperature was in favor of the chemical separation process. The extraction of Zn was accelerated with increasing temperature, while the dissolution of Cu and Fe was enhanced initially and then inhibited.
WhatsApp: +86 18221755073Conversely, if the activation energy is greater than 40 kJ/mol, this suggests a chemical reaction is taking place during the leaching process, which is referred to as linear leaching [47,49]. ... Ruiz-Sánchez, A.; Lapidus, G.T. Study of Chalcopyrite Leaching from a Copper Concentrate with Hydrogen Peroxide in Aqueous Ethylene Glycol Media.
WhatsApp: +86 18221755073Depending upon the chemicals used, some minerals float to the surface and are removed in a of air bubbles, while others sink and are reprocessed. ... charge material of copper concentrate mixed with a siliceous flux (often a low-grade copper ore) is heated in air to about 650°C (1200°F), eliminating 20 to 50 percent of the sulfur as ...
WhatsApp: +86 18221755073The use of the Arrhenius equation gives the values of the activation energy of 10.92, 18.83 and 25.25 kJ/mol respectively for copper, cobalt, and iron dissolution, for the chemical reaction ...
WhatsApp: +86 18221755073An experimental study was conducted to elucidate the evolution of size and chemical composition of La Caridad copper concentrate particles during oxidation under simulated flash smelting conditions. Input variables tested included particle size and oxygen concentration in the process gas. The response variables included the size distributions, chemical composition, …
WhatsApp: +86 18221755073The process of extraction of copper from its ores and preparing copper metal or chemical compounds for use in various goods is known as copper processing. ... such as alumina, limestone, pyrite, and silica, in order to …
WhatsApp: +86 18221755073The overall chemical reactions for chalcopyrite are: ... Copper concentrate is added to the reactor in an amount so as to provide a pregnant liquor containing 30-40 grams per liter (which is reduced to 20-25 grams per liter after washing the leach residue), for feed to the SXEW plant. Leaching of chalcopyrite concentrates is complete within 10 ...
WhatsApp: +86 18221755073Following copper and iron dissolution from the copper concentrate over time confirmed that bacteria strongly catalyzed the bioleaching of the concentrate with a maximum copper dissolution of 94%. Metal bioleaching was enhanced by applying the 5-step adaptation protocol since the bacteria were adapted to the ore and the physico-chemical ...
WhatsApp: +86 18221755073Abstract: A mathematical model has been presented to study the combustion of a single copper concentrate particle with high moisture con- tent. By using the presented model, the effect of …
WhatsApp: +86 18221755073Two copper concentrates, "La Escondida" and "La Caridad", were oxidized in a stagnant gas-flow reactor to examine and compare their combustion behavior. "La Escondida" concentrate is a …
WhatsApp: +86 18221755073Molybdenite is the most important molybdenum concentrate, which is mainly recovered as a by-product from porphyry copper deposits. Due to the low efficiency of purification processes such as flotation in the reduction of copper content of molybdenum concentrate to a standard level (i.e., less than 0.5 wt.%), further purification by a hydrometallurgical method is …
WhatsApp: +86 18221755073Copper concentrate produced from copper-molybdenum ore in Erdenet mining plant, Mongolia using flotation was used in this study. The most frequent size fraction of the concentrate is -38.1 to +25.4 μm with about 49% distribution. The chemical compositions and mineralogical constituents of the copper concentrate are presented in Table 1.
WhatsApp: +86 18221755073A preliminary qualitative analysis of these reactions allows us to clarify several relevant aspects. Even though Reactions [] and [] are inverse, both are considered in the reaction model, because bornite is also produced by a solid-state reaction between Cu 2 S and FeS in the presence of gaseous sulfur, with chemical characteristics associated with bornite but with …
WhatsApp: +86 18221755073Our investigation reveals that impurities in the concentrate inhibit the re-oxidation of copper oxide, and their removal is essential to improve performance. Based on these …
WhatsApp: +86 18221755073Figure 5 shows the copper concentrate leaching results for 216 h at 45 °C using the addition of potassium iodide in the range of 100 to 5000 ppm with a concentration of 0.5 M H 2 SO 4. It should be mentioned that leaching systems with lower iodide concentrations (<50 ppm) were not included as these gave lower copper extractions (<30%), and ...
WhatsApp: +86 18221755073The chemical reactions which take place between sodium sulphide and these As- and Sb-bearing minerals are presented in Table 5. It can be seen that As and Sb are both converted to sodium thio-anions. ... Copper concentrate produced at BHP Billiton's Olympic Dam mine in South Australia is leached in dilute sulphuric acid without addition of ...
WhatsApp: +86 18221755073copper losses is the chemical dissolution of copper [8, 28], in which the sulfidic copper in matte is oxidized to slag as cuprous oxide through Reaction 8.
WhatsApp: +86 18221755073COPPER CONCENTRATE CONTAINING ARSENIC AND LEAD SULPHIDE MINERALS (ENVIRONMENTALLY HAZARDOUS SUBSTANCES, SOLID, N.O.S.) ... The Hazard fields include special hazard alerts air and water reactions, fire hazards, health hazards, a ... If the chemical is escaping from a container where it was pressurized or refrigerated, it may first …
WhatsApp: +86 18221755073Copper processing - Roasting, Smelting, Converting: Once a concentrate has been produced containing copper and other metals of value (such as gold and silver), the next step is to remove impurity elements. In older processes the …
WhatsApp: +86 18221755073The distribution of copper, iron, and sulfur during the oxidation of La Caridad copper concentrate particles under simulated flash smelting conditions was studied in a laboratory reactor.
WhatsApp: +86 18221755073Combustion and coalescence of copper concentrate particles in the reaction shaft. 2nd Report. J Min Mat Processing Inst Jpn. 106 (14):873 ... Balladares-Varela E, Araneda-Hernández E. 2018. Evolution of size and chemical composition of copper concentrate particles oxidized under simulated flash smelting conditions. Metall Mater Trans B. 49B(10 ...
WhatsApp: +86 18221755073When using thermodynamics to investigate the limit of the chemical reactions of dust, it is important to know that the thermodynamic equilibrium is not always reached in the WHB ... Table 3 summarizes the chemical alterations of the most common copper concentrate minerals along the length of the WHB. Since these elements are present in the ...
WhatsApp: +86 18221755073S. Table 1 shows chemical composition of the complex copper concentrate used in the study. The sample was grinded under 200 mesh by ball mill. Figure 2 presents the XRD pattern of the complex copper concentrate. The XRD analysis found metals like copper, zinc, lead, and iron in the complex copper concentrate are present as sulfides such as CuFeS
WhatsApp: +86 18221755073of copper suldes. Based on kinetic study results of shrinking core models, both chemical and diusion reactions controlled the copper leaching process with an obtained activation energy of 33.56 kJ/mol. For recovery of the leached copper, the precipitation process was done by the addition of Na 2 S at 45 °C, S/Cu = 1, and pH = 9.
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