Ammonium-carbonate leaching of metal values from water …
With two-stage leaching at 50C in concentrated ammonium carbonate, the copper-plus-nickel content can be reduced to a level of less than 1 percent from an original content on the order of 10 percent. By roasting the depleted sludge with soda ash, at least 80 percent of the chromium can be recovered in water-soluble form.
[PDF] Leaching kinetics of low-grade copper ore containing …
DOI: 10.1016/S1003-6326(11)61538-0 Corpus ID: 73719281; Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate
Leaching kinetics of copper flotation tailings in aqueous ammonia …
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%.
Leaching kinetics of low-grade copper ore containing …
Trans. Nonferrous Met. Soc. China 22(2012) 2822âˆ'2830 Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong 1, 2, YIN Zhou-lan 1, HU Hui-ping 1, CHEN Qi-yuan 1 1.
Ammonium Carbonate Leaching Of Metal Values From …
Treatment of the raw, dried sludge used in this experimental program by ammonium carbonate leaching to remove copper and nickel appears to have reduced the susceptibility of the treated residue to further attack, both by simulated acidic rainwater and by organic acids, such as acetic acid. The evidence in support of this conclusion is derived ...
LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE …
In ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution. ... Aydoğan, S., Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching ...
Ammonia leaching process for selective extraction of nickel …
Ammonia leaching is generally carried out at a lower temperature, reducing heat consumption. In this paper, firstly, the possibility of selective extraction of nickel and cobalt from MHP was evaluated from a thermodynamic standpoint. ... Cobalt recovery from mixed Co–Mn hydroxide precipitates by ammonia–ammonium carbonate leaching. Min. ENG ...
Ammonia leaching of slag from direct-to-blister copper smelting technology
The obtained results indicate the possibility of receiving quite high copper leaching efficiency from slag with a relatively low yield for lead extraction. The use of ammonium acetate solutions with a concentration of 5 mol/dm 3 leads to leaching from the slag over 80% of the copper contained in it after 90 min of the process carried out at a ...
Hydrometallurgical recovery of copper from complex …
Tested leaching agents include sulphuric acid, ammonia–ammonium carbonate and ammonia–ammonium sulphate solutions, with or without addition of hydrogen peroxide. The results show that ammonia leaching has high selectivity for copper, and it could serve as a first step to recover the copper content in the e-waste, which is one of the major ...
Leaching kinetics of copper flotation tailings in aqueous …
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste …
The aqueous chemistry of the copper-ammonia system and …
The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high consumption of acid.
Zinc Precipitation from Ammonia Leaching Solutions of …
Recovery of zinc and safe disposal of electric arc furnace dust (EAFD) is an urgent problem. Ammonia–ammonium bicarbonate solutions can selectively leach zinc from EAFD. However, the method for zinc precipitation from leachate concerns quality of zinc products and efficiency of the process. Recently, precipitation of zinc by using gaseous CO2 as …
Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching
The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, [NH 3 ]/[NH
Acidic and Ammonium Sulphate Leaching of Historic Copper …
Ammonium Sulphate Leaching. Ammonia medium used for leaching was prepared by adding 66 g of ammonium sulphate to 3.5 mL ammonium solution and 200 mL of distilled water. Half of the prepared ammonia solution was used to leach 40 g of the copper tailings sample. The pH during the entire leaching process was 8.3.
Frontiers | Copper Recovery From Ammonia …
Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of …
Effect of Preliminary Alkali Desilication on …
Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing minerals on the kinetics of Cu and …
Selective leaching of copper and zinc from primary ores and …
Copper leaching of metals from solid matrices by ammonium carbonate is well documented. However, little is known about metal extraction with biogenic ammonia, with just two studies to date implicating the role of microbially produced ammonia from a low grade Cu ore (Wang et al., 2013; Hu et al., 2016). Moreover, no studies to date have ...
Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla …
The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach copper from high …
Method for ammoniacal leaching of copper from oxidised copper …
a method for leaching copper from an oxidised copper ore wherein at least 5% of the copper present in the oxidised copper ore is in the form of an oxidised copper compound comprising the method steps of: applying an aqueous solution of a curing agent to the oxidised copper ore, producing a cured ore; forming a leach solution by applying an ammoniacal solution that has …
Ammoniacal leaching and recovery of copper from alloyed …
The high-copper alloy can dissolve spontaneously in ammoniacal solutions with added copper(II) ions. The leaching in chloride, carbonate and sulfate baths allowed a distinct …
Leaching Thermodynamics of Low-Grade Copper Oxide Ore …
This paper describes a highly alkaline low-grade copper oxide ore. Copper can be selectively leached out while other metals are retained. A thermodynamic model of the CuO-(NH4)2SO4-NH3-H2O system was established for the leaching of tenorite (CuO) under conditions of mass and charge conservation. MATLAB's fitting functions, along with the diff and solve …
US4165264A
An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a …
Leaching kinetics of copper flotation tailings in aqueous ammonia …
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue.
Leaching kinetics of malachite in ammonia solutions
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper … Expand
Recovery of Copper from Ammoniacal Leachates by Ion Flotation
For this reason, ammonium carbonate ((NH 4) 2 CO 3) was selected as ammonium salt for the leaching of the microwave-roasted material in combination with aqueous ammonia. The effect of total {ammonia + ammonium} concentration ([NH 3 + NH 4 +]), leaching temperature, and leaching time on the leaching efficiencies of copper and zinc is shown in ...
Leaching Kinetics of Malachite in Ammonium …
to 10.8. The pH was buffered at 8.8 by the ammonium carbonate. Habashi and Dugdale m have shown for chryso- colla, an oxide ore of copper of somewhat similar behavior, that variation of pH from 8.5 to 12 had little effect on copper recovery leaching with …
Comparison of various extractants for recovery of Copper …
Solvent extraction of copper from the copper leach solution obtained from the ammoniacal carbonate leaching of the Sarcheshmeh copper concentrate was carried out, and the performance of CP-150, LIX984N, and Kelex100 as well as the effects of different parameters involved were investigated. According to the results obtained, the extraction kinetics of all the three …
Ammoniacal System Mechanisms for Leaching …
Although different copper compounds have already been tested with this leaching alternative in different ammonia media such as malachite in ammonia/ammonium carbonate system, oxidized copper ore in ammonium …
Behavior of Copper Dissolution in an Ammonia Solution …
Among hydrometallurgical processes, the ammonia leaching process is well known. The ammonia solution dissolves copper with a very high selectively; iron and aluminum are not dissolved. …
The hydrometallurgical extraction of zinc by ammonium carbonate…
Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in ...