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Selective leaching processes for copper, gold, nickel, and cobalt have been investigated because there is an advantage of ammoniacal hydrometallurgy that metal such as copper could be selectively ...
The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium-carbonate solution with oxygen as an oxidizing agent …
Paper No. 487 AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW . V Radmehr. 1, S M J Koleini. 2, *, M R Khalesi. 3. and M R Tavakoli Mohammadi. 4. ABSTRACT
The reduction-roasting ammoniacal-leaching technology, widely used for the processing of nickel laterites, has been applied for the extraction of copper, nickel and cobalt from polymetallic sea nodules of the Indian Ocean. Results are presented of the various leaching experiments conducted under different conditions to optimise the recoveries of copper, nickel and cobalt.
Keywords: Copper, Ammoniacal Carbonate Leaching, Kelex 100, LIX984N, CP-150. 1. Introduction The Sarcheshmeh copper mine is located in the Kerman Province, Iran. The Sarcheshmeh copper complex involves production units of the mine itself, concentrator, smelter, refinery, foundries, and leaching with the capacity of 160,000
The leaching of metal sulfides in ammoniacal solutions is of industrial importance for the production of copper, nickel and cobalt. In some processes, such as the Sherritt Gordon process, they are introduced as feed; while in others, such as the Caron process, they form in-situ, as intermediate products.
(2010). Effect of thiosulfate, sulfide, copper(II), cobalt(II)/(III) and iron oxides on the ammoniacal carbonate leaching of nickel and ferronickel in the Caron process. (1975). Electrochemical investigation of the dissolution of copper, nickel, and copper-nickel alloys in ammonium carbonate solutions. (1997).
1. Introduction The ammonia leaching process has been considered as a promising approach for the recovery of copper and nickel from associated minerals and various secondary materials. 1 It supports selective extraction of copper and nickel into solutions as their ammine complexes, and simultaneously separates them from the majority of insoluble impurities in ammoniacal solutions, such as ...
selectively leach the nickel out of its ore have been developed. A process for leaching oxide nickel ores was described by Caron (1). The ore as subjected to a reducing roast, followed by cooling under non-oxidizing conditions and then leaching by an ammoniacal ammonium carbonate solution. The limonitic type ores, low in magnesia, can be leached by
fields of ammonia leaching of copper and extraction of ... conditions and eventual leaching in an ammonia–ammo-nium carbonate solution [5]. ... ammoniacal column leaching for Meskani Mine ...
of copper from nickel in ammoniacal solution using ... scheme could enhance the leaching medium utilization and reduce the cost in the later puri cation process, especially suitable for processing low-grade resources. As a result, the ... LIX984N form ammoniacal/ammonium carbonate medium,
Extraction studies for copper, nickel, cobalti and zinc from ammoniacal- ammonium carbonate solution of Indian ocean nodules were undertaken using Di-2-ethyl-hexyl-phosphoric acid(D2EHPA). The leach solution was processed for the metal extraction-separation applying the coextraction concept.
A process for the recovery of nickel and/or cobalt from an impure nickel, cobalt or mixed nickel/cobalt material including the steps of: a) providing a nickel, cobalt or mixed nickel/cobalt material; and b) contacting the nickel, cobalt or mixed nickel/cobalt material with a feed ammoniacal ammonium carbonate solution and a reductant in a leach step.
Feb 05, 2021· Several ammoniacal species have been used to target different metal and mineral systems and it is often reported that ammonium carbonate is advantageous over other species due to its relative low toxicity and stability of free NH 3 and the resulting metal ammine complex by carbonate (Jha et al., 2001; Zapp et al., 2012). Copper leaching of ...
Oct 19, 2020· Solvent extraction scheme to isolate Zn, Cu, and Ni from glutamate media as hypothetical product of electric arc furnace dust alkaline leaching was developed, with concentrations being 17.6, 0.35, and 0.14 g/L, respectively. Three extractants were investigated: Cyanex 272, DEHPA, and Acorga M5640 selectively separated Zn, Ni, and Cu from each other. Aside from pH, parameters …
Apr 27, 2021· Copper and zinc extraction by ammoniacal leaching from microwave-roasted Cu-Zn-Pb sulfidic tailings followed by recovery of copper and zinc by ion flotation and precipitation. Introduction Tailings are mixtures of fine-grained unwanted fractions after mineral beneficiation of ores at a mining site that are considered as a waste [ 1, 2 ].
Abstract: Hydrometallurgical processing of copper-bearing materials (ores, concentrates, by-products) is usually done with the use of acidic or ammonia leaching. In the case where a leaching feed material contains significant amounts of carbonate rocks and iron minerals the second method is preferential due to a higher process selectivity.
Furthermore, because chromium, which is most often associated with copper and/or nickel in metal-finishing sludges, is not complexed during ammoniacal leaching, pregnant ammoniacal leach liquors should be relatively * Hewedi, M. A., and L. R. Engle. The NH3-C02-H20 System at Atmospheric Pressure in Nonferrous Extractive Metallurgy.
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AU2004228982B2 - Reductive ammoniacal leaching of nickel and cobalt bearing materials - Google Patents Reductive ammoniacal leaching of nickel and cobalt bearing materials ... leach mixed ammonium carbonate Prior art date 2003-04-11 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal ...
May 20, 2005· 2.2.. Leaching experimentsLeaching experiments with sulphuric acid and ammoniacal solutions were carried out at room temperature in semi-closed, cylindrical 2000. mL glass beakers for 24 h.. A stirring speed of a 700 rpm, with a magnetic stirrer, was set up to ensure the full suspension of particles and to improve the liquid-to-solid phase contact.. All the chemicals used in this work were of ...
To help maintain an adequate supply of minerals to meet national, economic, and strategic needs, the Bureau of Mines investigated the feasibility of extracting copper from coarse native copper ore with ammoniacal ammonium carbonate solution by a simulated in situ leaching procedure. A 5.9-Metric-ton (6.5-Ton) sample of minus 30.5- Centimeter (12-inch) conglomerate-type ore analyzing 1.96 percent
Heating in hydrogen improves the extraction of copper even further and maximum extraction by ammoniacal-ammonium carbonate and by sodium cyanide solutions is achieved for …
METAL RECOVERY FROM SECONDARY COPPER CONVERTER DUST BY AMMONIACAL CARBONATE LEACHING By Robert C. Gabler, Jr.,1 and Jack R. Jones2 ABSTRACT Effective recycling or disposal of flue dusts is a continuing problem, particularly for secondary smelters treating low-grade Cu scrap. The Bureau of Mines investigated a variety of flue dust treatment
The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it was 4.0. The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the
The leachate solution may alternatively be either boiled, to precipitate a basic copper carbonate or sulphate, or treated with a reducing agent to obtain metallic copper, for example in powder form. The ammoniacal leaching solution is suitably maintained at a temperature between 20° and 100°C.
Dec 25, 2017· The recyclability of the leach solution was successfully demonstrated. On the first leach cycle, only 65 pct of the Zn from the flue dust appeared in the Zn product. Its level of recovery is limited by the solubility of Zn in ammoniacal carbonate solution at pH 7.
There are many studies related to the leaching of oxidized and sulfide copper ores in ammoniacal media [5−13] or acidic media [14−16]. If there is a preponderance of carbonates or siliceous gangue in the ore, acid medium is not suitable for leaching owing …