atmospheric ammonia leach matte

(PDF) ATMOSPHERIC LEACHING OF MATTE AT THE PORT …

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 …

Atmospheric pressure leaching of nickel from a low …

2018-6-27 · Atmospheric pressure leaching of nickel from a low-grade nickel-bearing ore Sepideh Javanshir, Zahra Heidari Mofrad, Ahmad Azargoon ... In general, High Pressure Acid Leach (HPAL) is known as the most effective aqueous treatment process for the extraction of valuable metals from laterite ores (Dalvi et al., 2004). But the process

Technical note: Contribution of ammonia emitted from ...

Ammonia reacts with atmospheric nitric and sulfuric acids to form PM(2.5) (nitrate and sulfate), but the proportion of PM(2.5) attributable to ammonia emitted from animal farming operations has not been quantified. Thus, the objective of this analysis was to estimate the contribution of ammonia emitted from farm animals to PM(2.5) in the United ...

A FUNDAMENTAL EVALUATION OF THE ATMOSPHERIC …

2015-7-1 · In this study, the leaching behaviour of a Ni–Cu matte in CuSO4–H2SO4 solution during the repulping (pre-leach) stage at Impala Platinum Refineries was studied. The repulping stage is basically a non–oxidative atmospheric leach stage, in which nickel, iron and cobalt are partially dissolved, while the copper is precipitated. To

Ammonia leaching

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 strongly alkaline ...

On the Operability of the Sherritt-Gordon Ammonia Leach …

The objective of this thesis was a study of the operability of the leaching process at the Kwinana nickel refinery. The refinery makes use of the Sherritt-Gordon process for producing London Metal Exchange-grade nickel briquettes and other products.

Ammonia Leaching: A New Approach of Copper Industry …

2013-12-10 · Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new approach in the world to this method. …

A study on the oxidative ammonia/ammonium sulphate ...

2007-5-1 · 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: 24.9% Cu, 35.1% Ni, 4.05% Co, 11.5% Fe, and 24.5% S.

OVERVIEW OF PGM PROCESSING

2015-1-12 · low grade conc. matte converting • Refractory conc. penalties: c. 15% MgO, 2-6% Cr 2 O 3 • High temperature capability > 1400°C • Mixed low grade, solid • Refractoriness capability (0.5-5% Cr 2 O 3) • High process temperature capability > 1300°C • Sulphur fixation • Whole/Slow-cool matte leach capability • Ni/Cu/Co & PGM ...

Parametric Effects on Leaching Behavior of Nickel …

Ammonia leach of metals=matte Ni þ4NH 3 þ 1 2 O 2!ðNiðNH 3Þ 4Þ 2þ þ2OH ð3Þ Cu þ 4NH 3 þ 1 2 O 2!ðCuðNH 3Þ 4Þ 2þ þ 2OH ; ð4Þ In this present study, the effects of various factors such as concentration of the solvent (ammonia), temperature and time …

A fundamental evaluation of the atmospheric pre-leaching ...

In this study, the leaching behaviour of a Ni–Cu matte in CuSO4–H2SO4 solution during the repulping (pre-leach) stage at Impala Platinum Refineries was studied. The repulping stage is basically a non–oxidative atmospheric leach stage, in which nickel, iron and cobalt are partially dissolved, while the copper is precipitated.

Why heap leach nickel laterites?

2021-2-4 · ferronickel product or converting to a low iron-containing matte. Outside of China where there are 2 atmospheric leach project and a small heap leach the only operational hydrometallurgical processes are High Pressure Acid Leaching (HPAL). 2.2. Pyrometallurgical For all pyrometallurgical nickel laterite operations the ore must

The leaching of vanadium(V) in soil due to the presence of ...

The natural leaching of vanadium(V) with CO2 from soil-water in the presence of ammonia, a known precursor to atmospheric aerosols, has been tested by bubbling carbon dioxide through soil suspension with varying amount of ammonia. It was found that the leaching of V(V) is enhanced in the presence of …

Nickel Smelting and Refining

to the furnace to produce a matte for processing. Most laterite nickel processers run the furnaces so as to reduce the iron content sufficiently to produce ferronickel products. Hydrometallurgi-cal processes based on ammonia or sulfuric acid leach are also used. Ammonia leach is usually applied to the ore after the reduction roast step.

Increased atmospheric ammonia over the world''s major ...

2017-3-16 · 1 Introduction. Atmospheric ammonia (NH 3) is an important component of the global nitrogen cycle [Galloway and Cowling, 2002; Galloway et al., 2008; Sutton et al., 2007, 2008; Erisman et al., 2008, 2013; Fowler et al., 2013, 2015] the troposphere ammonia reacts rapidly with acids such as sulfuric (H 2 SO 4), nitric (HNO 3) to form fine particulate matter (PM 2.5) [Malm et al., 2004].

metallurgy

metallurgy - metallurgy - Leaching: Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid. Ammonium hydroxide is used for native ores, carbonates, and sulfides, and sodium hydroxide is …

Ammonia

Ammonia is a gas with a vapor pressure of 7500 mm Hg at 25 deg C and atmospheric pressure (3), and therefore, is expected to volatilize from dry soil surfaces (SRC). In soil, ammonia can serve as a nutrient source for plants, which can be taken up by plants and microorganisms and converted to …

Pyrometallurgical upgrading of PGM-rich leach residues ...

2017-8-28 · concentrates, converting of the furnace matte and removal of the bulk of the Ni, Cu, Co, S and Fe through atmospheric and pressure leaching in a base metals refinery to produce a PGM-rich concentrate. A number of impurities, mostly Se, Te, As, Bi, Os and Pb, are not removed significantly during the oxidising leach process in sulphuric acid media.

Ammonia | US EPA

2021-1-21 · Ammonia is a key component of the nitrogen cycle in streams, where it may be dissolved in the water column or associated with sediments. At high enough concentrations, ammonia can be toxic to aquatic organisms. In general, unionized …

Solvent Extraction of Nickel and Cobalt from Ammonia ...

2015-3-8 · Ammonia loading ≤1.5 g/l Caron Process. A solution which contains 12 g/l Ni, 1 g/l Co, 45 g/l NH 3 and 25 g/l CO 2 was prepared that si-mulates a pregnant-leach solution of Caron Process [14]. The desired solution pH was adjusted by ammonia and sulphuric acid solution. Sulphuric acid was also used as stripping agent. 2.2. Methods

Titanium Metal-Seated Ball Valves for HPAL and POX …

2018-4-14 · ammonia leach process, along with sulphate oxidative leach (licensed by Sherritt to Outokumpu in 1961), and chlorine leach, have been commonly used for refining nickel matte (~70% Ni) after the concentrates have already been smelted.12 Due to nickel economics and the complexity of the technology, Moa Bay

Direct Nickel Process – Breakthrough Technology

• Atmospheric pressure, 304 stainless construction • Recovers 90-95% Ni in 1 to 4 hours residence time • Much lower technical intensity than HPAL and smelting — easier implementation • Recycles reagent (+95%), environmentally friendly • Reduced waste disposal - suited to tropical locations

Atmospheric Ammonia Leach Matte

Why heap leach nickel laterites?

THE APPLICATION OF THE CESL NICKEL PROCESS TO …

2015-11-20 · While the pressure leach step is similar in all plants, the processes vary considerably in the treatment of the leach solution. The CESL Nickel process for sulphide concentrates has been adapted to treat pressure leach solution from laterite ores and offers an alternative to the existing flowsheets.

An Investigation into the Effect of Temperature on the ...

Ammonia as an effective leaching agent has been widely used in a number of Hydrometallurgical processes. The main advantage is that the basic leach solution alleviates corrosion problems encountered in the acid systems. Ammonia is also advantageous in that ammonia and ammonium ion constitute a pH buffer solution. However, it has the disadvantage of

PRESSURE LEACHING

2020-1-22 · The technical advantages of pressure leaching over atmospheric leaching stem from a combination of elevated operating temperature and oxygen overpressure, both of which increase ... vessels to oxidatively leach nickel and copper in an ammonium lixiviant. Figure 2: General flowsheet of processing refractory gold ores using pressure oxidisation .

(PDF) Parametric Effects on Leaching Behavior of Nickel ...

Ammonia leach of metals = matte. Ni ... the repulping stage is basically an atmospheric leach stage in which the matte containing mostly Ni and Cu is leached in copper-spent …

TENDER ANNOUNCEMENT

2020-7-17 · matte slurry. In this atmospheric leach most of the Ni is extracted as NiSO4 solution. Some Rh, Ru and Ir goes into solution in the autoclave (2nd and 3rd stage leaches) and is recycled in the spent. The 1st stage leach is an important step to cement these PGM''s back onto the residue.

Nickel-Cobalt-Copper Conference

2017-8-2 · RECOVERY FROM AMMONIA LEACH SOLUTIONS 322 Alexander Tsekov, Todor Angelov, Georgi Savov, Iontech 2000 JSC (Bulgaria); Bas Nauts, Attero (The Netherlands) SULPHIDE PRECIPITATION FOR COPPER RECOVERY FROM LEACHING CIRCUITS AS AN ALTERNATIVE TO SX-EW: THE DRIVERS 330 Hermann Scriba, Independent Metallurgical Consultant (Australia) …

Atmospheric acid leaching of nickel

2009-8-26 · Atmospheric acid leaching of nickel-copper matte from Impala Platinum Refineries The pre-leach stage in the second process route alternative, described above, is the subject of this study. The study investigates the leaching behaviour of Ni–Cu matte in H2SO4-CuSO4 solution during the repulping stage at Impala Platinum Refinery.

Nickel Laterites in SE Asia

2019-7-30 · Matte smelting 14 Ammonia leaching 14 Acid leaching 12 2008 Figures CSA, CRU Analysis. World Nickel Production by Ore Type 30.0% 32.0% 34.0% 36.0% 38.0% 40.0% 42.0% 44.0% 46.0% 48.0% 50.0% 0 100 200 300 400 500 600 700 800 900 1990 1995 2000 2005 2009 ... Atmospheric Leach • Acid –key capital and operating cost driver • Capital and ...

Environmental Guidelines for Copper Smelting

2018-8-5 · process the ore is leached with ammonia or sulfuric acid to extract the copper. These processes can operate at atmospheric pressure or as pressure leach circuits. Copper is recovered from solution by electrowinning – a process similar to electrolytic refining. The process is most commonly used for leaching low grade deposits in situ or as heaps.