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This slag contains large amounts of metallic values such as copper and cobalt. A representative slag sample containing 0.98% Cu, 0.49% Co and 51.47% 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 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.
CHAPTER 4 LEACHING OF CRYSTALLINE SLAGS 36 4.1 Leaching of Flash Furnace Slag 36 4.1.1 Effect of temperature 36 4.1.2 Effect of acid addition 37 4.1.3 Kinetics and chemistry of leaching 38 4.1.4 Residues of leaching 40 4.2 Leaching of Converter Slags 41 4.2.1 Effect of oxygen partial pressure 41 4.2.2 Refined conditions 43
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 0.1, 0.5, and 1 M concentrations at 1%, 5%, and 10% pulp densities (PDs); and (ii) normality equivalent (2 N) acids ...
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 0.1, 0.5, and 1 M concentrations at 1%, 5%, and 10% pulp ...
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 high-res image (193KB) Download : Download full-size 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).
Jun 01, 2010· The optimized parameters for leaching 20 g copper smelt slag are as follows: sulfuric acid leach 17.6 g; sodium chlorate oxidant 2.5 g; reaction time 3 h. at 95 °C. During the neutralization step, 4.3 g calcium hydroxide was added slowly into the pulp to maintain the pH of the leach solution around pH 2.0 for at least 1 h with constant ...
Copper in the chlorination dust of copper-containing slag was recovered through the hydrochloric acid agitation leaching-N902 extraction process, and the main influential factors on the leaching ...
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.
up to 0.4% and large amounts of iron and silica [1]. Therefore, copper slags show an eco-nomical potential for recycling by using metals extraction processes. Various hydrometallurgical methods have been proposed for extracting metals from the copper slags, including direct leaching in sulfuric acid or ferric chloride [2, 3]. Roasting of
Recovery of copper from copper slag and copper slag flotation tailings 77by oxidative leaching Leaching with ferric sulphate The slag and the slag flotation tailings were leached with ferric sulphate in 1 M sulphuric acid. The ferric iron concentration was varied in the range from 5 g/dm3 to
A.N. Banza, E. Gock, K. Kongolo, Base metals recovery from copper smelter slag by oxidizing leaching and solvent extraction, Hydrometallurgy 67 (2002) 63–69. [ 17 ] I.M. Ahmed, A.A. Nayl, J.A. Daoud, Leaching and recovery of zinc and copper from brass slag by sulfuric acid, Journal of Saudi Chemical Society (2012). Article in press.
A study on the sulphuric acid leaching of copper converter slag in the presence of dichromate H.S. 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
Dec 01, 2002· Leaching of the slag 3.1.1. Sulphuric acid leaching of copper smelter slag. Leaching tests were carried out at pH 2.5 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 .
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 0.1, 0.5, and 1 M concentrations at 1%, 5%, and 10% pulp ...
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, P.O. Box 16200, FI 00076, Aalto, Finland b Outotec Research Center, Kuparitie 10, PO .
Curing the slag with strong sulphuric acid, without re-smelting 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.
Sep 01, 2016· 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. The factors affecting the performance and efficiency of the leaching processsuch as agitation rate, leaching time, acid concentration and temperature were ...
Leaching of copper smelting slag in chloride media was studied. The lixiviants used were aqueous solutions of hydrochloric acid (0.5-2.0 M HCl) as well as hydrogen peroxide and hydrochloric acid ...
A hydrometallurgical process for treating slag material, especially copper smelter slag material, comprises vigorously mixing the slag material with about one part by weight of sulfuric acid and about one part by weight of water for each part by weight of the slag material, and allowing the resulting mixture to react to produce a dry, solid material, containing the metal values of the slag in ...
ABSTRACTA hydrometallurgical method is discussed to selectively extract base metals such as copper, cobalt, nickel and iron from the copper granulated slag (0.53% Cu) at atmospheric pressure. It involves first-stage leaching of slag with organic (citric acid) to selectively recover cobalt, nickel and iron. The residue containing high copper was subjected to second-stage leaching with inorganic ...
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 ...
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 1.4% Cu, 0.7% Co, 8.9% Zn and 20.9% Fe(II), has been used in this study.
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 liquid-solid ratio, time and other) were investigated and analyzed in the production process.
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