International Journal of Metallurgical Engineering 2013, 2(2): 243-248 DOI: 10.5923/j.ijmee.20130202.17 Extraction of Tin and Copper by Acid Leaching of PCBs

acid cure). native copper slow leaching in sulphuric acid at atmospheric temperature. kinetics improve when agitated with aerated hot strong acid. chalcocite covellite bornite leachable with sulphuric acid/ferric sulphate solutions. kinetics suitable for dump or heap leaching. kinetics improve

Leaching copper from oxide ores, low grade secondary sulfide ores, and primary sulfide concentrates with aqueous acid or ammonia solutions, followed by solvent extraction (SX) has been practiced commercially since the late 1960's.

Extraction of Tin and Copper by Acid Leaching of PCBs. Printed circuit board (PCB) waste is generally dumped as a landfilling or treated pyrometallurg ically, which consumes enormous power, generates hazardous gases and also destroys valuable PCB co mponents. For recycling of the components, they must be separated from the printed circuit ...

Different leaching strategies for copper, zinc, and lead have been described in the literature. Lu et al. [] obtained up to 97% copper extraction in 9-h tests from chalcopyrite concentrate in solutions containing 0.8 mol/L H 2 SO 4 and 1 mol/L NaCl at high temperatures (60–95 °C).The authors reported that chloride concentrations > 0.5 mol/L did not enhance the leaching rate of chalcopyrite ...

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 ...

This method is an acid heap leaching method like that of the copper method in that it utilises sulfuric acid instead of cyanide solution to dissolve the target minerals from crushed ore. The amount of sulfuric acid required is much higher than for copper ores, as high as 1,000 kg of acid per tonne of ore, but 500 kg is more common.

Keywords: blister copper, flash smelting slag, citric acid, lead recovery, leaching 1. Introduction As a result of melting of copper concentrates in direct-to-blister flash smelting furnace, a slag with a significant copper content (12-16%) is obtained as one of the products. This is 25-30% of copper …

The "Gall-Copper Process" was recorded as being used during the Song Dynasty (960-1271AD). Copper was precipitated from solution by dipping iron into the blue vitriol solution - a process identified as early as 150 BC in China. 6 Therefore, presumably, the recognition of a natural copper leaching process can be identified as early as that date.

Leaching offers an alternative to copper mining. First, the ore is treated with dilute sulphuric acid. This trickles slowly down through the ore, over a period of months, dissolving copper to form a weak solution of copper sulphate. The copper is then recovered by electrolysis. This process is known as SX-EW (solvent extraction/electrowinning).

Heap leaching is used in tandem with electrowinning, for copper extraction; approximately 16% of the world's total copper production is extracted in this way. The Radomiro Tomic mine in Chile is a prime example of the success of copper heap leaching, followed by …

The dominating copper phases in the slag are Cu, Cu2 O and CuFeO 2 (XRD and SEM-EDS). Leaching copper from these phases using sulfuric acid has a fast dissolution kinetics. Smaller particle size, higher temperature (up to 40 °C) and increasing mixing power (up to 0.26 kW/m 3) enhance the leaching kinetics.

Acid consumption is another area of concern due to the high consumption of 18–20 tons of acid per ton of copper at YCM, which corresponds to 34% of the overall production cost, and high acid consumption also leads to mineral dissolution and subsequent precipitation that commonly reduce permeability and restrict 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 with safety ...

ACIDIC LEACHING OF COPPER AND TIN FROM USED CONSUMER EQUIPMENT D. Oraca,*, T. Havlika, A. Maulb, M. Berwangerb a Technical University of Kosice, Faculty of Metallurgy, Department of Non-Ferrous Metals and Waste Treatment, Kosice, Slovakia b RWTH Aachen University, Department of Processing and Recycling, Aachen, Germany (Received 03 December 2014; accepted 06 April 2015)

leaching of copper-bearing ores in the U.S The dissolved copper recovered by this operation was derived from the natural oxidation and leaching of sulfide mineralization in a major porphyry copper deposit located in the headwaters of Bingham Creek. This is the present site of the large-scale, open pit operation at Bingham Canyon, which

extract copper; for example, inorganic acids like HCl, HClO4, HNO3, and H2SO4, organic acids like citric acid and acetic acid, and spent acidic PCBs etching solutions [5–9]. Acid leaching is a simple process that extracts target metals from the sludge sample in a short duration with certain high

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...

Alena opens describing the heap leaching process for copper: Copper ore is excavated from the ground, crushed and then spread in uniform layers on a pad. A slow trickle of sulfuric acid is distributed over the pile, where it percolates to the bottom and a collection point.

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting "pregnant" leach solution of sulfuric acid and copper sulfate is collected in a small pool. The copper compound can now be seen at ...

A novel hydrometallurgical process was proposed for selective recovery of Cu, Ag, Au and Pd from waste printed circuit boards (PCBs). More than 99% of copper content was dissolved by using two consecutive sulfuric acid leaching steps in the presence of …

It is used to make sulfuric acid, which is sold or used to leach copper from suitable ores directly, thereby circumventing the entire smelting-converting cycle.) The result is an impure (98+%) form of metal known as blister copper (for its surface appearance). The blister is then fire-refined further to adjust its sulfur and oxygen contents ...

The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was achieved with all the acids ...

I am also setting up a copper ore leaching system. I have ore that runs from 3% to 35% copper. The leaching tank holds about 225 pounds of ore - much of which is native copper in matrix. It also contains small amounts of silver. Any help is much appreciated. If I'm doing something incorrect with this posting - please let me know.

453 Acid leaching of oxide–sulfide copper ore prior the flotation – A way for an increased metal recovery Miroslav D. Sokić1, Vladan D. Milošević1, Velizar D. Stanković2, Vladislav Lj.Matković1, Branislav R. Marković1 1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 2University of Belgrade, Technical Faculty, Bor, Serbia

Copper Leaching Practices. For centuries small amounts of copper have been recovered from acid mine-drainage waters. In recent years, the expansion of copper-bearing waste dump leaching for copper recovery has established a technological basis that is rapidly converting the art of copper leaching into a science.

Nitride leaching of copper-zinc sulfide middlings that are difficult to concentrate is studied with the aim of clarifying and supplementing results obtained previously. It is shown that organization of two-stage countercurrent leaching makes it possible to reduce the concentration of nitrate ions within leaching solution, to increase the degree of nitric acid regeneration, and to increase ...

acid series Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) ... Process of leaching copper ores. () ...

by neutralizing the acid leach liquor or by leaching oxide copper with ammonia, but neither solution was economical. a molecule that extracted copper well from typical dump leach liquors (pH ~1.8) had to be built. The reagent LIX 64, containing the ketoxime LIX Copper recovery using leach/solvent extraction/electrowinning technology:

leaching methods. Agents for leaching copper can be acid, base, or salt solutions. Of all of these agents, sulphuric acid has been given the broadest industrial application in hydrometallurgy of copper. The basic copper carbonate minerals, which are easily leached with the solution of sulphuric acid are: azurite, malachite and chrysocolla.

Nitric acid resulted to be the best leaching agent for copper removal from WPCB powder. Although copper along with ammonia can form the copper tetramine complex which is a beneficial homogenous catalyst for precious metals dissolution, an excess of this metal may compete with gold and silver to complex thiosulfate.

facility supports the copper leach-and-recovery process; sulfuric acid is re-quired to recover copper from raw ore. To keep up with the 1,550 tons of copper ore per day produced by the mine, the sulfur plant has the capac-ity to produce approximately 500,000 tons of acid annually. The plant sits on a 10-acre site with an enclosed

SURVEY OF PROPOSED METHODS FOR LEACHING COPPER SULFIDES 0000000 000000 Ammonia Pressure Leaching Cyanidation Ferric Chloride Leach Acid Chlorine Leach Ferric Sulfate Leach Direct Acid Pressure Leaching Bacterial Leaching . Conclusions o o o 0 0 o o O O O O O O O O O O O O O O O o 0 0 o o o o o o o e o o o o o o o o o o

Both citric acid and HCl have shown more than 75% recovery of copper and metals like Ag, Al, Pb, Ni, and Fe in the leaching solution in 4 h and 24 h, respectively, at 28ºC. Similarly, leaching ...

metal ores (<1% copper, <1g/ton gold, < 0.5% nickel) previously considered uneconomical, became feasible with introduction of heap leaching technologies (Marsden, 2009). In consideration of ore types, a generalized diagram showing the applicable ore beneficiation