It is reported that sulfuric acid can be used for the leaching of Ni containing wastes and nickel sulfate is commercially important due to its usage in electroplating [17].Some studies have demonstrated that sulfuric acid is more efficient than hydrochloric acid for nickel recovery from spent catalyst [18].Also, 99% of nickel is recovered when using acid concentration of …
WhatsApp: +86 18221755073Results are provided for sulfuric acid autoclave leaching of OAO SUMZ dust and dust obtained after recovery melting, containing alongside copper and zinc considerable amounts of lead and arsenic. The effect of temperature and acid concentration on autoclave leaching indices is studied.
WhatsApp: +86 18221755073In general, the dissolution process of copper mineral in sulfuric acid reagent includes five steps in a fluid–solid reaction system: (1) transport of leaching agent (H 2 SO 4) from the liquid bulk phase to the particle surface, (2) diffusion of sulfuric acid through the solid residual layer from the particle surface to the surface of ...
WhatsApp: +86 18221755073The leaching rate of copper and iron or silicon was 97% and less than 2% respectively when copper slag is treated by oxygen pressure acid leaching process, which can achieve the purpose of limiting the leaching of Si and Fe while highly selective leaching of valuable metals under low acidity and energy consumption conditions [12], [13], [14], [15].
WhatsApp: +86 18221755073Look at the concentrated sulfuric acid cell used to remove gold plate from copper we passivate the copper (here we can actually use a copper screen wire as an anode basket, were normally the electrolysis of the anode will force a reaction to occur that normally will not (or dissolve a metal into an acid that would not dissolve into the acid ...
WhatsApp: +86 18221755073The improvement in leaching introduced by the Russell process has stimulated the development of processes for refining lixiviation-sulphides. In the early days several processes for dealing with the sulphides were proposed, and some of them were tried more or less ; but the business finally settled down to sending the sulphides to the smelters, although this was …
WhatsApp: +86 18221755073Atmospheric leaching makes it possible to extract the main part of copper from the concentrate, while the solid residue, which contains pyrite and sulfur as well as residual amounts of copper, is processed by autoclave leaching, allowing generation of sulfuric acid and ferric sulfate, that are then used as a leaching agent, as well as recovery ...
WhatsApp: +86 18221755073In place of the solution taken from the beaker, a sufficient amount of sulfuric acid solution was fed to ensure a constant level of l/s (cm 3 /g). In most of the tests, apart from sulfuric acid, the addition of perhydrol was also used, which caused the intensification of the copper leaching process in accordance with the reaction (1).
WhatsApp: +86 18221755073Fig. 8(j-l) respectively shows the 2D geometric topography, cross-section height, and the 3D height topography of the oxidation leached cuprite; and, it is clear that when the ozone and sulfuric acid were respectively used as oxidant and leaching agent, the cuprite surface was oxidized by ozone to form a copper oxide film, and the copper oxide ...
WhatsApp: +86 18221755073In this study, the kinetics and mechanism of the leaching of iron from copper tailings using sulfuric acid were studied. Under optimal conditions (40 °C, sulfuric acid concentration of 0.53 mol L −1, stirring speed of 400 rpm, solid/liquid …
WhatsApp: +86 18221755073The method of dissolution by sulfuric acid and ferric sulfate with chemical precipitation by means of scrap or sponge iron appears to offer the best potential for wide application and low costs. Its basic chemistry is not complex but its economic application is dependent on handling of materials and solutions …
WhatsApp: +86 18221755073Harichandan and Mandre 13 used sulfuric acid with concentrations of 1 M and 3 M for the leaching of a mixed oxide-sulfide copper ore containing 67.19% SiO 2 and considered the concentration of 1 M as the optimal acid concentration. They concluded that the leaching efficiency increased with increasing the leaching time to 120 min, and it was almost constant …
WhatsApp: +86 18221755073High arsenic copper sulfide concentrates (HACSC) are becoming increasingly common in the world. Copper pyrometallurgy brings a series of problems, such as arsenic-containing dusts and waste acids that are difficult to treat. Hydrometallurgical process is an attractive alternative to treat HACSC. This work dealt with the leaching behaviors and kinetics …
WhatsApp: +86 18221755073Two-stage leaching and evaporation were applied to extract and purify copper from copper-contaminated sludge: (i) in the first stage, 2.0 N sulfuric acid could leach out 95.2% Cu and other impurities (Fe, Al, and Pb); (ii) in the second stage, an ammonia solution was used to stabilize Cu by forming an amine complex in solution, while other ...
WhatsApp: +86 18221755073Herein, the room-temperature sulfuric acid leaching of copper smelter slag powder in the presence of potassium dichromate was investigated, resulting in the selective extraction of copper with its separation from zinc and iron. To enhance the extraction of copper, mechanical activation in the planetary ball mill and attritor was used. ...
WhatsApp: +86 18221755073A laboratory scale study was conducted, aimed at finding an effective method for processing fine concentration tailings of copper-nickel ores. A sulfuric acid tailing granulation process followed by subsequent heap leaching of granules is proposed. Various methods of preparation and storage of the granular material are discussed. A solution of sulfuric acid was …
WhatsApp: +86 18221755073Sulfuric acid leaching of copper rich slag with the optimized parameters can provide a copper rich process solution with iron as the main impurity metal.
WhatsApp: +86 18221755073The use of this biochemical method in the copper leaching process resulted in a significant reduction in sulfuric acid consumption, by 40%, and a copper recovery rate of 87.2%. This paper provides an overview of …
WhatsApp: +86 18221755073The acid leaching solution utilized in this study was obtained by acid leaching copper smelting dust, and the main components of the leaching solution are shown in Table S1. ... 100 g/L sulfuric acid, and a leaching temperature of 80 °C. Under the optimal conditions of an initial liquid phase pH value of −0.4, a N235 concentration of 20 %, a ...
WhatsApp: +86 18221755073In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu2O), …
WhatsApp: +86 18221755073In recent years, the quest for sustainable and environmentally friendly methods for copper leaching has led to the exploration of alternatives to sulfuric acid [11]. This green …
WhatsApp: +86 18221755073exception of chrysocola, leaching behavior of copper-bearing minerals under ferric-iron/sulfuric acid leaching is generally closely modelled by dissolution with sodium cyanide of assay-type …
WhatsApp: +86 18221755073Similar to copper oxide heap leaching, also using dilute sulfuric acid. The final product is yellowcake ((U_3O_8)) and requires significant further processing to produce fuel-grade feed. Acid leaching is sometimes also referred to as heap leaching (Figure (PageIndex{1})) because the leaching process can be performed on large "heaps" of ...
WhatsApp: +86 18221755073strengths of sulfuric acid solutions. Sloan (1934) has evaluated a number of different analytical methods employing sulfuric acid leaching. Several of these methods or variations of these methods are routinely used for oxide or acid soluble copper determinations at commercial laboratories in the western United States.
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WhatsApp: +86 18221755073To investigate the effect of sulfuric acid dosage on the leaching rate of elements from copper slag, experiments were conducted while controlling other curing conditions (curing temperature of 200°C, curing time of 2 h, and water addition at 20 % of the dry mass of copper slag). ... Cured material (mixture of copper slag and sulfuric acid), (b ...
WhatsApp: +86 18221755073The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric acid–hydrogen peroxide (H2SO4–H2O2) system. To achieve high Cu recovery, it is important to evaluate the parameters of the leaching process and understand the Cu leaching kinetics. …
WhatsApp: +86 18221755073Sulfuric acid is often used as a leaching agent in leaching processes to obtain acid copper leaching solution [21]. Moreover, the method of extraction, adsorption, ion exchange, and chemical ...
WhatsApp: +86 18221755073which results in a reduction in the consumption of sulfuric acid for the oxidization of sulfides. The extraction of zinc from sphalerite into the solution under the sulfuric-acid leaching of refractory sulfide intermediate product of flotation at 20°C in 5 h is increased by 13.7% under the addition of Fe(III) ions [].Studies of the ozone-assisted oxidation and dissolution of minerals …
WhatsApp: +86 18221755073The highest copper leaching efficiencies were obtained for the highest sulfuric acid concentration (200 g/l) and the next stage of the research was started with the assumption that a solution of this concentration should be used. 3.2 Effect of …
WhatsApp: +86 18221755073Leaching of copper from a Jordanian copper ore has been studied using a stirred batch reactor with hydrochloric acid as the main lixiviant, under the following conditions: temperature 25 – 45 oC ...
WhatsApp: +86 18221755073The model diagram for leaching mechanism of copper powder-assisted sulfuric acid leaching of zinc ferrite was shown in Fig. 6. In the sulfuric acid leaching process of zinc ferrite assisted by copper powder, zinc ferrite acts as the cathode and copper powder acts as the anode. Electrons can be directly transferred from copper to the iron in the ...
WhatsApp: +86 18221755073Moreover, owing to low selectivity, precious metals are also dissolved in the leaching solution. Although atmospheric sulfuric acid leaching can adequately remove Cu. ... Removal of copper and enrichment of precious metals by pressure leaching pretreatment of copper anode slime in sulfuric acid medium. Precious Metals of China, 35 (2014), pp ...
WhatsApp: +86 18221755073The copper leaching became obviously slow when the 70 ∼ 80% copper sulfides was extracted. This is because there are passivation layers like the elemental sulfur attached on the surface of ore particles. ... Not only the curing time but also ionic concentration of sulfuric acid solution improve copper leaching efficiency in Chile (Bouffard ...
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