A selective acid leaching process was then used to recover the copper content of the residue after filtration. In the second stage, an additional 1 N of sulphuric acid was added to the suspension in the selective leaching process, and the pH value was controlled at 1.5-2.0. The reagent sodium hydroxide (2 N) was used as leachate at a pH greater
Finely grained samples of copper(I) sulphide were leached by H2SO4 solution with added NaNO3. The occurrence probability of chemical reactions was analysed based on literature data and products which were formed during the process and the
The flotation tailings pond of the Bor Copper Mine poses a great ecological problem not only for the town of Bor but also for the surrounding soils and watercourses. Since the old flotation tailings contain about 0.2% of copper on the average, we investigated their leaching with sulphuric acid in the absence and presence of an oxidant
Dec 14, 2014 Pacific NW. Jan 1, 2014. #10. Actually dilute the acid is stronger, concentrated sulfuric acid can passivate metals like iron or copper. concentrated sulfuric can be used in iron vessels because the iron passivates but if we added water we would dissolve the iron pot
Two-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
The sulphuric acid and basic ferric sulphate are recycled to the leach step and provide the acid and strong ferric sulphate solution required in the leach. The autoclave oxidation step provides virtually all acid and ferric sulphate required for the copper leaching process (Dreisinger, 2006)
Jun 05, 2010 Copper will not react with sulphuric acid, because copper is not reactive enough. Only metals which are higher than hydrogen
Jul 21, 2016 This article discusses results obtained from the sulfuric acid leaching of dust that is left from reduction smelting at the Middle Ural Copper Smelter. In addition to copper and zinc, the dust contains substantial amounts of lead and arsenic (up to 30%). The computer program Statgraphics was used to plan experiments and analyze the results
The BHP smelter at San Manuel produces 450,000 gallons of sulfuric acid a day, or enough to fill 12,500 rail cars or 52,000 trucks every year. BHP Copper uses 18 percent of the sulfuric acid it makes for leaching its own oxide ore. Another 40 percent of its sulfuric acid production is sold to other mining companies for their leaching operations
Acid-leaching Nickel and Cobalt. Often present with copper in sulfuric acid leach Hquors are nickel [7440-02-0] and cobalt [7440-48-4]. Extraction using an organophosphoric acid such as D2EHPA at a moderate (3 to 4) pH can readily take out the nickel and cobalt together, leaving the copper in the aqueous phase, but the cobalt—nickel separation is more difficult (274)
during flotation [3] implies that heap or vat leaching should be considered for these ores. In industrial heap or vat operations, sulphuric acid is commonly used to leach copper from oxide minerals such as malachite (CuCO 3.Cu(OH) 2), azurite (2CuCO 3.Cu(OH) 2) and chrysocolla (CuO.SiO 2.2H 2 O). Sulphuric acid was
Hard patented a copper leaching process using sulfuric acid in the presence of nitrate ions. The optimal pH range (0.5 and 1.5), nitrate concentration (1–10%) and ratio between H + and NO 3 − ions (ratio of 4 to 1) have been determined
The leaching mechanism is day while 62% of copper are extracted by a continuous probably governed by the complexation reaction between electroleaching. ... Zhong, S., Hepworth, M.T., 1995. A calculation method for determining of a polymetallic complex ore by sulphuric acid and thiourea mixed equilibria in metal–ammonia–water systems
Sulfuric acid injection in copper heap leaching. Copper mining from oxide ores demand sulfuric acid that percolates the heap leaching pill. From there acid is debilitated while copper goes to the electro winning process. LEWA process pumps are used to reinject sulfuric acid at 98% into the main pipelines that go to the heap leach sprinklers, recovering the concentration
May 23, 2017 The ferrous sulfate contained in the barren solution after copper precipitation, diluted with water to desired iron content is fed to the autoxidation cell together with sulfur dioxide with excess air to produce the sulfuric acid-ferrous sulfate solvent
Jul 01, 2003 The copper(I) sulphide leaching is a second-order reaction with respect to the concentration of H 2 SO 4 and its rate equation is: (12) − d [Cu 2 S] d t =k H [H 2 SO 4] 2 where: k Na and k H are rate constants; [NaNO 3] and [H 2 SO 4] are the leaching reagent concentrations
The Democratic Republic of Congo copper oxide ore containing mainly malachite was leached in sulphuric acid. The effects of leaching time, pH
Jan 22, 2017 Sulphuric acid of 66 B. is purchased at Colo., and shipped to the refinery in iron tank-cars, holding from 40,000 to 50,000 pounds. It is drawn or syphoned out of the cars into a lead-lined iron tank on a truck and hauled to the refinery, where it is discharged into the storage-tanks by means of compressed air
minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the recovery rate of copper oxide
leaching from low grade copper oxide ore by sulphuric acid, and they have obtained leaching percent of cop-per over 90%. Compared with the copper leaching effi-ciency of about 35% in the mill running technology the leaching process has achieved a better economic result. In the present study the leaching of oxide-sulfide copper ore was
In the first stage, 2 N of sulphuric acid was used to leach the dust, with pH values controlled at 2.0-3.0, and a solid-to-liquid ratio of 1:10. The results indicated that zinc extraction efficiency was higher than 95%. A selective acid leaching process was then used to recover the copper content of the residue after filtration
