Jan 15, 2021· The leaching tests were conducted in a stirred-tank reactor by H 2 SO 4 and de-ionized water as leaching solution with agitation rate of 500 rpm, pH of less than 2 and particle size (d 80) of 300 ...

Mar 27, 2013· leaching of copper from tailings using ammonia ammonium chloride solution Gold Recovery From Refractory Carbonaceous Ores By Pressure …Gold Recovery From Refractory Carbonaceous Ores By Pressure Oxidation, Thiosulfate Leaching And Resin-in-pulp Adsorption – Pa

rine, ammonium carbonate, ammonia, sulphur dio-xide, ammonium sulfate solution are used as the lixiviant for leaching of malachite.1–3,8–12 Ammo-nium chloride solutions are employed as lixiviant for leaching of different copper minerals.13,14 The use of ammonium chloride solution has some advantages. One of the important characteris-tics of ...

When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper(II) chloride, a powdery, light blue precipitate of copper(II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.

ABSTRACT Aqueous alkaline glycine solutions present technical advantages over acidic solutions for leaching oxidised copper minerals hosted in carbonate mineral matrix phases. In this study, the leaching and kinetics of malachite in alkaline glycine solutions have been studied. The influence of process variables such as glycine concentration, temperature, particle size and …

ammonia/ (ammonium chloride leaching time, the concentration of ammonia, solid/liquid ratio and temperature 75 Guo-dong and Qing, 2010) Dissolution kinetics …

Jan 05, 2012· The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution. The main parameters, such as ammonia and ammonium sulphate concentrations, particle size, solid-to-liquid ratio and reaction temperature, were chosen in the experiments. The results show that the increase of …

Leaching of copper from tailings using. ... ammonia–ammonium chloride solution and its dynamics. ... step indirect leaching system with biogenic ammonia. Copper leaching was …

Abstract 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, [NH3]/[NH4+] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated.

Dec 21, 2019· This research was aimed to investigate the leaching behavior of zinc and copper from a porcelain stone tailings sample using RSM-CCD modeling. The synergetic and individual effects of five main factors including liquid/solid ratio, sulfuric acid concentration, agitation speed, leaching time, and temperature were examined on the recoveries of zinc and copper. For this …

Dec 10, 2013· Z. Guo-dong, L. Qing, Leaching of copper from tailings using carbonate compound, commercially adopted in Nicaro in ammonia–ammonium chloride solution and its dynamics. Inter- Cuba, Marinduque in the Philippines and Queensland in national conference on chemistry and chemical engineering Australia [38].

complex copper ore in ammonia-ammonium chloride solution [J]. [10] FORWARD F A. Ammonia pressure leach process for recovering Transactions of Nonferrous Metals Society of China, 2010, 20: nickel, copper, and cobalt from Sherrit Gordon nickel sulphide 910−917. concentrate [J].

Feb 23, 2011· The leaching kinetics of willemite in ammonia-ammonium chloride solution was investigated. The effects of the ammonia-ammonium ratio, particle size, temperature, and total ammonia concentration on the leaching rate of willemite were determined. The results show that the optimum ammonia-ammonium ratio is 1:2 over the studied range. The zinc extraction …

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 ...

Gold Leaching Carbon In Leach Gold Extraction Process. Gold Leaching carbon in leach process is widely used in the newly built gold leaching plants in recent years and a lot of plants are changing into CIL as well Gold Leaching CIL process is suitable for the treatment of oxidized gold ore with low sulfur content and mud content It is unsuitable for the gold ore with …

The behavior of impurity elements during a copper recovery process from waste printed circuit board (PCB) using ammonia–ammonium sulfate and chloride systems are examined and the performance of these two systems are compared. Leaching of PCB was carried out by solutions containing copper(II) ammine complexes as the oxidizing agent.

The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper.

A process for the ammoniacal leaching of sulphide ores or concentrates to recover metals therefrom to form soluble complex, amines, the process including the step of treating the materials suspended in ammoniacal solutions with air or oxygen at or near atmospheric pressure and at or near ordinary atmospheric temperatures.

Oct 11, 2015· The cyanide consumption was 7 to 8 lbs. per ton which using a 0. 15% cyanide solution. When 6 lbs. of ammonium chloride was added to each ton of solution together was sufficient lime to convert all of the ammonium chloride to the hydroxide, the consumption of cyanide was reduced to 1 lb. per ton of ore.

The leaching kinetics of hemimorphite (Zn4Si2O7(OH)2·H2O) in ammonium chloride solution was presented in detail. Effects of stirring speed (150–350 rpm), leaching temperature (75–108 °C), particle size of hemimorphite (45–150 μm), and the concentration of ammonium chloride (3.5–5.5 mol/L) on the zinc extraction rate were studied. The zinc extraction rate enhanced …

Jun 24, 2004· In this study, the leaching kinetics of malachite [CuCO3·Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the …

Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics. The 2010 International Conference on Chemistry and Chemical (ICCCE 2010),2010,08 （ EI ） [3] Guo-dong ZHAO, Qing Liu. Study on purification of electrolytic solution in Alkaline Leaching.

L eaching of copper from tailings us ing ammonia/ammonium chloride solution and its dynamics, International Conference on Chem istry and Chemical Engineering (ICCCE 2010). Habashi, F, 1963.

The method for preparing electrodeposited zinc by ammonia leaching of zinc oxide of the invention comprises ammonia leaching, purification, flash evaporation, acidolysis, and electrodeposition, and particularly comprises the following steps: leaching zinc oxide ore in an ammonium-containing solution for a certain period, filtering to obtain a ...

malachite in ammonium chloride solution and a mathematical model was derived for the dissolution process which is controlled by diffusion through the product film. KŰNKŰL et al [19] studied the leaching kinetic s of malachite in ammonia solution and deduced a

A study on the oxidative ammonia/ammonium, - DeepDyve The oxidative ammonia/ammonium sulphate leaching of an artificial matte was carried out to investigate the extraction behavior of copper, nickel, and cobalt The composition of the synthetically prepared Cu–Ni–Co–Fe matte was: 249% Cu, 351% Ni, 405% Co, 115% Fe, and 245% S...

The invention relates to a gold leaching agent for gold-containing tailings and a preparation method thereof, belonging to the field of fine chemical engineering. The gold leaching agent prepared according to the formula not only belongs to an environment-friendly gold leaching agent, but also can greatly shorten the gold leaching time and improve the gold leaching …

The ammonium ion provides the protons (hydronium The effect of particle size on the leaching of copper ion) required for the dissolution of basic malachite ore, from the malachite ore was examined by using fractions whereas the ammonia produced forms stable complexes of the ore with average particle size of 136, 120, 93, 71.5, with copper (II ...

Nov 01, 2020· Table 2, Table 3 revealed that zinc and copper were mainly present in the forms of zinc oxide and zinc silicate and cuprous oxide and cupric oxide, respectively. The smelting slag sample was ground, mixed, dried, and sieved to obtain 65–75 μm particles for the leaching experiments. Ammonium chloride with a concentration of 99.2% and stronger ammonia …

The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and ...

Aug 15, 2021· Nicol (2018) compared the acid leaching with chloride against the ammoniacal leaching of copper from chalcopyrite even in low pH conditions of 7–8.5 (at which the free ammonia concentration is well below the pK b (9.3) of ammonia), according to which a relatively more rapid dissolution rate of chalcopyrite in ammonium chloride solution than ...

Feb 05, 2021· Abiotic factors (ammonia speciation and pH) were assessed by using different synthetic ammonia species on copper leaching from the ASR using 1 mol L −1 total ammonia. NH 4 Cl and NH 4 OH were added as pure solutions, whilst for pH modifications, NH 4 HCO 3 was mixed with NH 4 OH to create a pH range of 8.8–9.3.

The Taguchi method was used as the experimental design to determine the optimum conditions for the dissolution of nonsulfide zinc ores in ammonium carbonate solution for high recovery of zinc, and to minimize the extraction of iron and lead. The experimental conditions were studied in the range of 35−75 °C for reaction temperature (T), 300−800 rpm for stirring speed (R), 2−4 …

An improved method for the recovery of copper from a copper sulfide concentrate, chalcocite, comprising partially leaching the chalcocite concentrate with an aqueous ammoniacal solution, such as ammonia and ammonium sulfate, with no substantial leaching of sulfur or conversion to sulfate, and extracting the copper from the resulting aqueous ammoniacal partial leach …

Deep recovery of copper: leaching with ammonium salt system. For recovery of copper in the copper concentrate, copper concentrate with different size was used as raw material of leaching, using environmentally friendly ammonium salt leaching system. 3 mol/L ammonia solution and 2 mol/L ammonium chloride solution were used as the leaching agent.

Mar 25, 2013· Sulfate Precipitation During Oxidative Ammonium Leach Of Cu, Ni, The leaching of copper, nickel and zinc sulfide ores and concentrates under pressure with a solution of ammonium sulfate containing free ammonia (ammonium hydroxide, »More detailed...