atmospheric ammonia leach matte

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Nitrogen cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere terrestrial and marine ecosystems The conversion of nitrogen can be carried out through both biological and physical processes Important processes in the nitrogen cycle include fixation ammonification nitrification and denitrification

The leaching behaviour of nickeli?copper matte in an acidici?copper sulphate solution during the repulping stage at Impala Platinum Refineries has been studied The base metal recovery process consists of a matte repulping stage prior to a series of pressure leach stages Therefore the repulping stage is basically an atmospheric leach stage in which the matte containing mostly Ni and Cu

the instability of the product from the leach area causes instability and production loss in the downstream areas of the plant User Story The circuit is fed ground nickel matte in slurry form to which amsul containing liquor anhydrous ammonia and air are added to extract nickel from the matte

development of a Sulphation Atmospheric Leach (SAL) process capable of treating limonite and saprolite ore from Skye's Fenix project in Guatemala By means of a phased approach a novel atmospheric leach process was developed first at bench scale and subsequently at pilot scale The overall testing program - starting with

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


Ammonia/nitric Acid Leaching of Copper

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

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

Leaching of the matte is performed in the presence of chloride compounds at temperatures close to the boiling point of solution Falconbridge (now Glencore) employed a non-oxidative chloride process using excess concentrated HCl under atmospheric conditions (Winand 1991)

Steady-state optimisation of the leaching process at Kwinana Nickel Refinery 3 The principal leach chemistry is the pressure oxidation of sulphide to sulphate where upon oxidation the metal ions combine with ammonia in solution to form ammine complexes thus [3] → ++ 2− 4 2 MS 2O2 n NH3 M(NH3 )n SO (1)

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 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

smelting to produce a PGM-bearing nickel matte which is shipped to specialist refineries using hydrometallurgical processes to recover the nickel copper PGMs and cobalt There are many such refinery processes including • ammonia leach e g the

By introducing an acid pre-leaching process into the oxidative ammonia leaching process we achieved the high extraction efficiencies of 98 03% 99 13% and 85 60% for the valuable metals Ni Cu and Co respectively from the low-nickel matte

Parametric Effects on Leaching Behavior of Nickel

ture leaching time ammonia concentration and pH) on the leaching behavior of Ni-Cu matte were investigated The temperature range studied was between 50 Cand70C ammonia concentration was varied from 1 5 2 0 2 5 to 3 0M while the leaching time ranged from 0 to 300min The stirring speed was kept constant at 410rpm while the

Saturday 23 May to Saturday 30 May Subject to change Reduction Roast-Ammonia Leach (Caron) Process Smelting Processes Heap Leaching Atmospheric Agitated Tank Leaching - Sulphuric Acid Leaching - Chloride Leaching - Nitric Acid Leaching Segregation Roasting Previously Proposed Processes Sulphation Roast

The mixture of hydrochloric acid and magnesium chloride is a good lixiviant for the processing of sulfide minerals concentrates and matte samples The proton activity in this mixture deviates positively from ideal activity This enhances the leaching power to break sulfide lattices down and to dissolve metals into solution Magnesium (chloride) was chosen because it is one of a few reusable

The objective of this paper is to conduct a feasibility study of selective recovery of Co Ni and Cu from a low grade matte with a high-iron content using sulfuric acid leaching at atmospheric pressure An innovative process is proposed to directly leach the high-iron cobalt matte at atmospheric

Across Europe total nitrogen deposition is increasing and of this total atmospheric ammonia can contribute up to 50–80% Average deposition of ammonia in the UK is likely to be around 15–20 kg ha −1 yr −1 while in The Netherlands which has some of the highest rates of deposition this value is likely to be between 40 and 50 kg ha −1 yr −1

The effect of leaching time and ammonia concentration on the atmospheric leaching of copper F Ntuli E Muzenda I Ramatsa M Belaid J Kabuba Acidified ferric chloride leaching behaviour of a complex Ni–Cu matte at atmospheric pressure LM Sekhukhune University of Johannesburg 2012

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

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

termined by salts and solutes originating from atmospheric deposition and cuticular leaching and the dissolved ions and other solutes in turn control the solubility of ammonia by their influence on pH (Burkhardt and Eiden 1994 Sutton et al 1993) In this paper a single layer ("big leaf") chem-

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