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Since joining the technical projects department (hydrometallurgical projects), I was attached to the heap leach pilot project where I was involved with establishing the particle size distribution for the heap leach feed, studying the response of slag to flotation for copper/cobalt recovery including the amenability of slag to leaching through sulphuric acid roasting for copper and cobalt recovery.
Concentrator. The copper recovery was rather low (about 40%) mainly due to the presence of oxide copper and insufficient mineral liberation. In our previous work, we investigated the technical feasibility of increasing copper recovery by leaching and flotation of slag tailings using sulphuric acid solutions, without or with the addition of
Jun 18, 2020· Synchronous extractions of nickel, copper, and cobalt by selective chlorinating roasting and water leaching to low–grade nickel–copper matte. Separation and Purification Technology 195, .
This study demonstrates that citric acid leaching at ambient temperature (, 308 K (35 °C)) and normal pressure can effectively be used to extract base metals from copper converter slag. With citric acid, a maximum recovery of % Cu, % Ni, 94% Co, and % Fe .
Sulfuric acid leaching for capturing value from copper rich converter slag Muhammad Kamran Khalid a, Joseph Hamuyuni a, Vivek Agarwal a, Jouni Pihlasalo b, Mika Haapalainen b, Mari Lundstrom€ a, * a Aalto University, School of Chemical Engineering, Department of Chemical and Metallurgical Engineering, Box 16200, FI 00076, Aalto, Finland b Outotec Research Center, Kuparitie 10, PO .
May 01, 2019· Leaching efficiency of lead and copper from slag depending on the concentration of citric acid (t = 15 min, l/s = 10). Download : Download highres image (193KB) Download : Download fullsize image; Fig. 9. The content of lead and copper in samples after leaching depending on the time of the process (1 mol/dm 3 citric acid, l/s = 10).
CHAPTER 4 LEACHING OF CRYSTALLINE SLAGS 36 Leaching of Flash Furnace Slag 36 Effect of temperature 36 Effect of acid addition 37 Kinetics and chemistry of leaching 38 Residues of leaching 40 Leaching of Converter Slags 41 Effect of oxygen partial pressure 41 Refined conditions 43
The problem was solved by leaching with sulphuric acid under hydrogen peroxide, which also performs simultaneous iron oxidation and removal. A copper smelter slag from Lubumbashi, Democratic Republic of Congo, containing % Cu, % Co, % Zn and % Fe(II), has been used in this study.
Copper in the chlorination dust of coppercontaining slag was recovered through the hydrochloric acid agitation leachingN902 extraction process, and the main influential factors on the leaching ...
The aim of this study was to evaluate the feasibility of (bio)hydrometallurgical methods for metal extraction from historical copper slags. Two types of slags (amorphous slag—AS, and crystalline slag—CS) were subjected to 24 to 48 h of leaching with: (i) Sulfuric acid at,, and 1 M concentrations at 1%, 5%, and 10% pulp densities (PDs); and (ii) normality equivalent (2 N) acids ...
Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of % pure copper called cathodes, which will ultimately be made into products for everyday most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different ...
Jun 23, 2016· It is found that leaching rates of cadmium and zinc both exceed 99 % in a very short time, but for copper, leaching rate of 99 % is achieved under the optimized leaching parameters, which are agitation rate of 100 r·min −1, sulfuric acid concentration of 15 wt%, leaching temperature of 80 °C, slag particle size of 48–75 μm, activated ...
Leaching and recovery processes for zinc and copper from brass slag by sulfuric acid were carried out and iron and aluminum were also precipitated as hydroxides in addition to silica gel.
Abstract. Copper smelter slag was leached using sulphuric acid solutions under atmospheric conditions. Base on the composition and phase of copper slag, the effect of the concentration of sulfuric acid and leaching temperature to the leaching growth rate of Fe, Cu, Co and Ni in the copper slag were investigated in this paper.
In this paper, sulfuric acid leaching of copper slag at atmospheric pressure was used to produce copper sulfate solution and higher leaching ratio of copper sulfate solution was obtained. Meanwhile, some factors (Acid concentration, the temperature, the liquidsolid ratio, time and other) were investigated and analyzed in the production process.
A study on the sulphuric acid leaching of copper converter slag in the presence of dichromate Altundogan a,*, M. Boyrazli b, F. Tumen a a Department of Chemical Engineering, Firat University, 23279 Elazig, Turkey b Department of Metallurgical and Materials Engineering, Firat University, 23279 Elazig, Turkey Received 24 June 2003; accepted 6 November 2003
Jun 01, 2010· The optimized parameters for leaching 20 g copper smelt slag are as follows: sulfuric acid leach g; sodium chlorate oxidant g; reaction time 3 h. at 95 °C. During the neutralization step, g calcium hydroxide was added slowly into the pulp to maintain the pH of the leach solution around pH for at least 1 h with constant ...
Curing the slag with strong sulphuric acid, without resmelting or roasting as practiced currently in the industry, render it accessible to leaching, and more than 95% of cobalt and up to 90% of copper was extracted together with iron by water leaching, leaving silica behind in a residue.
Leaching of copper smelting slag in chloride media was studied. The lixiviants used were aqueous solutions of hydrochloric acid ( M HCl) as well as hydrogen peroxide and hydrochloric acid ...
al. (2004) studied the sulfuric acid leaching behavior of copper converter slag in the presence and absence of dichromate. They reported significant dissolution of Co, Fe and Zn from the copper slag (, and %, respectively) in H2SO4 (in the absence of K2Cr2O7). The addition of K2Cr2O7 significantly
Dec 01, 2002· Leaching of the slag Sulphuric acid leaching of copper smelter slag. Leaching tests were carried out at pH on ground slag samples (<100 μm). Fig. 1, Fig. 2, Fig. 3, Fig. 4 show the reacted fraction of copper, cobalt zinc and iron during leaching in .
This slag contains large amounts of metallic values such as copper and cobalt. A representative slag sample containing % Cu, % Co and % Fe was used in the experimental studies. Two different methods, direct acid leaching and acid baking followed by hot water leaching were used for recovering Cu and Co from the slag.
Leaching of the Copper Slag Leaching of the copper slag with concentrated sulphuric acid and distilled water, without increasing the digestion temperature, resulted in leaching recoveries of 45%, with a final copper content in the leach residue of %. The reaction was exothermic and the measured temperature of the reaction
Apr 01, 2019· In 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 (Cu 2 O), delafossite (CuFeO 2) and metallic copper (Cu).The study investigates the effect of particle size, temperature, acid concentration, agitation and leaching time under oxidizing conditions.
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