mospheric ammonia leach matte

Nickel Laterites in SE Asia - CSA Global

Atmospheric leach Heap leach. Sorowakosmelter, Indonesia. ... 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 % tonnes Ni ('000) Lateritic Ni ...


Thermal Transformations of Main Components in Molybdenite ...

Feb 13, 2019· Abstract. Oxidative roasting-ammonia leaching is the most popular method to extract Mo from molybdenite concentrates. However, the pyrometallurgical process has long suffered from the exhaust gas treatment for acid-making using low-concentration SO 2.Technically, gas circulation can work as an effective means to enrich SO 2 in exhaust gas and meantime to reduce overall emissions.


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

the temperature and the reaction involved on the leaching of copper-matte. Copper (Cu) bearing matte from Impala Refinery (Pty) Ltd was used in the investigation. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations (leaching solution) of 3.0M, temperature of 50˚C,


Mine Details | MiningLink.com.au

Kwinana Nickel Refinery Refines Nickel Matte From the Kalgoorlie Smelter The nickel matte refined at the Kwinana nickel refinery all comes from the BHP Billiton Nickel West smelter at Kalgoorlie. It is refined at the Kwinana plant using an ammonia-leach process that has a capacity to manufacture 65,000 tonnes of nickel metal a year.


Ammonia - Environmental Fate

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 …


Atmospheric oxidative and non-oxidative leaching of Ni-Cu ...

and ammonia leaching has been based on local conditions or the composition of the matte. Acid leaching has been used for mattes with substantial cobalt contents (above 3%), while ammonia leaching has been widely used for Ni-Cu mattes with low cobalt contents (Pearce et al., 1960). However, with further developments in acid pressure leaching


Kinetics of nickel leaching from low-nickel matte in ...

In this study, the kinetics of the acid leaching process of low-nickel matte under atmospheric pressure was studied. In addition, the effects of the stirring speed, initial sulfuric acid concentration, reaction temperature and particle size on the leaching of nickel were investigated.


A comparative study of different le aching processes for ...

route to produce Cu-Ni-Co-Fe rich matte and Mn slag [18], l- fo lowed by leach reagableents [19-ing witt suih 21]e present p th. In pera we have made a comparison study of three different leaching pro-cesses (H 2 SO 4 /oxygen pressure leaching, atmospheric FeCl 3 leach-ing, NH 4 OH/(NH 4) 2 SO 4 pressure leaching) carried out in our labo-


nickel ore leaching

A common method for nickel leaching from the matte is by using ammonia under high pressure, producing a nickel-bearing solution. This solution is heated to remove copper, and the use of hydrogen gas under high pressure precipitates nickel metal; remaining nickel in the solution can be precipitated by adding hydrogen sulfide.


Pyro- Versus Hydrometallurgy or Dry Versus Wet Methods

Leaching ZnS + H 2 SO 4 + O 2 → ZnSO 4 + S + H 2 O Electorysis Zn 2 + + 2e- → Zn SO 4 2- + H 2 O → H 2 SO 4 + O 2 + 2e-Copper Matt formation versus Pressure leaching Matte Formation: Copper sulfide concentrate is melted in a flash smelting furnace (Figure 10) to produce matte. This must be treated further in a converter (Figure 11) to ...


Biogeochemical Cycles Flashcards | Quizlet

-use ammonia or nitrate to create fertilizer-this process requires a lot of energy, but humans now fix more N2 than is fixed in nature -the fertilizer creates a increase in crop fields--> more consumers (cows) intake N2 cause they eat crops


Pressure leaching of nickel and cobalt sulphides with ...

The leaching tests were carried out in a 2 liter titanium autoclave. Typically, 250 g nickel and cobalt sulphide (containing about 17% by weight of water) were leached with chlorine for 2 hours in 1.6 liters of aqueous solution, which is generally an anolyte from nickel electrowinning containing about 30 g/l Ni, and variable concentrations of copper and balanced amounts of chloride ions ...


Efficient Synchronous Extraction of Nickel, Copper, and ...

Jun 18, 2020· A study on the oxidative ammonia/ammonium sulphate leaching of a complex (Cu–Ni–Co–Fe) matte. Hydrometallurgy 86, 164–171 (2007). CAS Article Google Scholar


Ammonia | US EPA

Jan 21, 2021· Ammonia (NH 3) is a common toxicant derived from wastes (see Figure 1), fertilizers and natural processes. Ammonia nitrogen includes both the ionized form (ammonium, NH 4+) and the unionized form (ammonia, NH 3 ). An increase in pH favors formation of the more toxic unionized form (NH 3 ), while a decrease favors the ionized (NH 4+) form.


Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

reported that, copper from Cu matte can Ni-easily been leached by using ammonia at atmospheric condition. Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. More Ammonia leaching can be used in non-oxidative,


An Electrochemical and Leach study of the Oxidative ...

Ammonia systems can be effectively used to leach copper from chalcopyrite in the presence of an oxidant. The ammoniacal leaching system is heavily reliant on a good surface mass transfer system, hence it being widely studied in high pressure systems where oxygen was accepted to be the oxidant.


Nickel processing - Extraction and refining | Britannica

Various processes are used to treat nickel matte. One process is the ammonia pressure leach, in which nickel is recovered from solution using hydrogen reduction, and the sulfur is recovered as ammonium sulfate for use as fertilizer.In another, the matte may be roasted to produce high-grade nickel oxides; these are subjected to a pressure leach, and the solution is electro- and carbonyl refined.


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

Directly leaching valuable metals from low nickel-copper matte has been studied for many years, using such as CuSO 4 -H 2 SO 4 -O 2 atmospheric pressure, CuCl 2 -NaCl-HCl, HCl, H 2 SO 4 -O 2 ...


ALTA Short Course Outline - Nickel-Cobalt Laterites

Atmospheric agitated tank leaching - Sulphuric acid leaching - Chloride leaching - Nitric acid leaching - Segregation roasting Break Other c ommercial treatment processes . Reduction roast -ammonia leach (caron) process ... Ferronickel and matte smelting . Nickel pig iron smelting . Previously proposed processes . Sulphation roast . Republic ...


Conference Program - ALTA Metallurgical Services

• Pressure Acid Leaching • Reduction Roast-Ammonia Leach (Caron) Process • Smelting Processes • Ferronickel and Matte Smelting • Nickel Pig Iron Smelting Processes Under Development • Heap Leaching • Atmospheric Agitated Tank Leaching - Sulphuric Acid Leaching - Chloride Leaching - Nitric Acid Leaching


Titanium Metal-Seated Ball Valves for HPAL and POX Plant ...

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


Outotec's Innovative Nickel Matte Leach Process | E & MJ

Outotec, in fact, said it has constantly been developing new, sustainable, and economically viable nickel processing methods—and its nickel matte chloride leaching process is designed to leach matte in atmospheric OKTOP reactors using hydrochloric acid and oxygen, as well as ammonia for pH control.


US3962051A - Atmospheric leaching of matte containing iron ...

A method is provided for leaching comminuted nickeliferous sulfide matte containing by weight about 20% to 75% nickel, about 5% to 50% copper, non-stoichiometric sulfur in the range of over 4% to about 20%, over 0.5% to about 15 or 20% iron, the sum of the nickel, copper and sulfur contents being at least about 80% of the matte composition, with the balance gangue or slag and incidental ...