Atmospheric Ammonia Leach Matte

After curing, the pug is ground, slurried and leached at 95–100 °C, in the presence of an iron-bearing "seed", for sufficient time, typically 12 to 48 h, to dissolve most of the nickel and cobalt but leave most of the iron in the residue. This invention forms the basis for Skye Resources proprietary Sulphation Atmospheric Leach process.

The oxidative ammonia/ammonium sulphate leaching of an artificial matte was carried out to investigate the extraction behavior of copper, nickel, and cobalt.

enriched sulfide material termed nickel matte. Typically, nickel concentrates destined for smelting have a combined base metals (Ni + Cu + Co) grade of 8% to above 20%, though ... A review of laboratory studies into atmospheric pres- ... Balachandra (1969) who studied ammonia pressure leach-ing of a copper-nickel concentrate containing 6.8% Ni ...

Physicochemical Problems of Mineral Processing, 2016. In this study, the effects of acid/ore ratio (0.1-0.6 g H2SO4/g dry ore), leaching temperature (200–240 °C) and leaching time (30–120 minutes) on the high pressure sulphuric acid …

The leach solution is boiled to recover the ammonia, while the thiosulphates and ... Xiao W, Sun F, Liu X, Zhao Z (2021) Sulfuric acid leaching for low nickel matte under atmospheric pressure. In: Ni-Co 2021: the 5th international symposium on nickel and cobalt, pp 219–226 ... A novel ammonium chloride roasting approach for the high ...

A process of the selective leaching of nickel from low-sulfur Ni-Cu matte at atmospheric pressure was described. ... ammonia/ammonium sulfate, FeCl3-HCl and FeCl3-HCl-CuCl2 media to leach [2–17]. However, these methods often have a low recovery of valuable metals, and because of their poorer selectivity in leaching to metals (especially for ...

In a first stage atmospheric leach in a typical Sherritt Ni–Cu matte leach process, a Ni–Cu–Fe–S Peirce Smith converter matte is contacted with recycled copper spent electrolyte (an aqueous copper sulphate/sulphuric acid solution) at 85 °C with the purpose of dissolving nickel, while simultaneously removing copper from solution. In the PGM industry, copper removal is …

The leach solution is boiled to recover the ammonia, while the thiosulphates and thiosulfonates are ... ammonium sulfate and nickel sulfide ore were mixed according to the mass ratio of 4:5, and then roasted at 400 °C for 2 h for water leaching. ... (2021) Sulfuric acid leaching for low nickel matte under atmospheric pressure. In: Ni-Co 2021 ...

The effects of ammonia concentration and leaching time were investigated to determine the optimum leaching conditions. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. Ni-Cu matte containing 23% by mass Cu was used in this …

In a first stage atmospheric leach in a typical Sherritt Ni–Cu matte leach process, a Ni–Cu–Fe–S Peirce Smith converter matte is contacted with recycled copper spent electrolyte (an ...

The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. …

This study reports the influence of concentration of the solvent (ammonia), leaching temperature, leaching time, and pH on the recovery of nickel and copper from the matte.

It was found that, leaching temperature, oxygen pressure and pH, were important factors that influenced the dissolution of metal sulphide phases present in the matte. The …

The Effect of Leaching Time and Ammonia Concentration on the Atmospheric Leaching of Copper, 2nd International Conference on Chemistry and Chemical Engineering, IPCBEE vol.14, Singapore. Ochromowicz, K., Jeziorek, M. and Wejman, K. (2014). Copper (Ii) Extraction From Ammonium Leach Solution.

Atmospheric Leach Processes ... when leaching nickel matte, pentlandite, and a range of other ... 10% for stirred tank leaching and 6–16% during column leach-ing. Ammonia losses were found to ...

This study reports the influence of concentration of the solvent (ammonia), leaching temperature, leaching time, and pH on the recovery of nickel and copper from the matte. The elemental composition analysis of the matte indicated that …

There-fore, atmospheric direct leaching in ammonia solution with ammonium persulfate ((NH4)2S2O8) as the oxidant appears to be a feasible approach for Ni, Cu, and Co recovery …

In general, acidic leaching is a reasonable approach to decompose high-grade nickel matte and realize the separation of Ni and Cu. Therefore, it is necessary to develop a highly efficient leaching method that decomposes high-grade nickel matte at non-toxic atmospheric pressure (Changyuan et al., 2015; Xiao et al., 2021a; Zhang and Nicol, 2010).

Based on the above considerations, direct treating low nickel matte by non-oxidative leaching using H 2 SO 4 under atmospheric pressure for extracting nickel, cobalt, copper and precious metals may be a choice. In this paper, the low nickel matte is treated directly by hydrometallurgical process instead of converting, which will avoid a large loss of cobalt.

An aqueous solution of (NH 4) 2 S 2 O 8 /NH 3 solution was used to leach low grade nickel matte to improve the metal extractions in atmospheric leaching. High metal extractions (98.0% nickel, 99.1% copper and 85.6% cobalt) were obtained by introducing acid pre-leaching into oxidative ammonia leaching process ( Chen et al., 2017 ).

In the ammonia (Caron Process) ... Chesbar is developing an atmospheric chloride leach process for its Sechol laterite property in ... Falconbridge's Matte Leach Process pioneered the use of ...

Procedia Earth and Planetary Science 6 ( 2013 ) 457 â€" 464 1878-5220 2013 The Authors. Published by Elsevier B.V. Selection and/or peer review under responsibilty of Institut Teknologi Bandung and Kyushu University. doi: 10.1016/j.proeps.2013.01.060 International Symposium on Earth Science and Technology, CINEST 2012 Precipitation of Nickel …

ATMOSPHERIC CHLORIDE LEACHING: THE WAY FORWARD FOR NICKEL LATERITES Bryn Harris and John Magee Chesbar Resources Inc.1, 55, University Avenue, Suite 910, Toronto, Ontario M5J 2H7, Canada

The fitting results showed that Ni in the atmospheric pressure leaching residue is present as NiS (853.46 eV), Ni 3+ (857.21 eV) and NiO (861.50 eV) (Maile et al.,2023, Zhang et al., 2022), which suggested that atmospheric pressure acid leaching can leach Ni 0 from Ni 3 S 2. This was in keeping with the result that nickel matte can only achieve ...

Selective leaching of high iron cobalt matte in sulfuric acid at atmospheric pressure is being reported. The matte assaying 4.55%Co, 13.58%Ni, 3.72%Cu and 53.6%Fe was produced by carbothermal reduction and pyrite sulfuration of nickel converter slag containing 1.36%Co, 3.39%Ni and 1.01%Cu from the Jinlong nickel smelter (Yunnan, China). The process is made …

Therefore, the repulping stage is basically an atmospheric leach stage in which the matte containing mostly Ni and Cu is leached in copper-spent electrolyte from the tank house, resulting in ...

The raw materials for these processes can be sulfide concentrates, matte, arsenide concentrates, and precipitated sulfides. Typically, acidic conditions are used for leaching however, ammonia …

The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology (RSM) …

Leaching by ammonia is well defined in the extractive metallurgy of nickel such as the Sherritt ammonia pressure leach process for sulfidic ores and the Caron process for laterites. Ammonia leaching processes bring selectivity, low toxicity (as compared with commercial reagents such as carbonyl), low cost, and ease of ammonia regeneration by ...

The Sherritt ammonia pressure leach process is notable for direct treatment of nickel sulphide concentrates without prior smelting. ... An experimental evaluation of the leaching kinetics of PGM-containing Ni–Cu–Fe–S Peirce smith converter matte, under atmospheric leach conditions. Miner. Eng., 24 (6) (2011), pp. 524-534.