atmospheric ammonia leach matte

Aug 28, 2013· Abstract. Gaseous ammonia (NH 3) is the most abundant alkaline gas in the atmosphere.In addition, it is a major component of total reactive nitrogen. The largest source of NH 3 emissions is agriculture, including animal husbandry and NH 3-based fertilizer applications.Other sources of NH 3 include industrial processes, vehicular emissions and …

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Parametric Effects on Leaching Behavior of Nickel-Copper Matte in Ammonia E. MUZENDA,1 I. M. RAMATSA,1 F. NTULI,1 A. S. ABDULKAREEM,2 and A. S. …

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The residue is removed. A feed of matte and sulfide concentrate containing approximately 0.4% cobalt and 30% sulfur is pressure leached at elevated temperature and pressure in an ammoniacal solution to produce a solution of nickel, copper and cobalt. By boiling away the ammonia; copper is precipitated as a sulfide and sent to a smelter.

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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 …

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Ammonia (NH 3) in the atmosphere has tripled as the result of human activities. It is a reactant in the atmosphere, where it acts as an aerosol, decreasing air quality and clinging to water droplets, eventually resulting in nitric acid (H NO 3) that produces acid rain. Atmospheric ammonia and nitric acid also damage respiratory systems.

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Atmospheric oxidative and non-oxidative leaching of Ni-Cu matte the leaching behaviour of typical South African PGM-containing Ni-Cu mattes in chloride media is worth investi-gating. This study investigated the atmospheric leaching of PGM-containing Ni-Cu matte by acidic ferric chloride solution. The aim of this project was to achieve maximum ...

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ecological behaviour, lead-containing copper matte, oxidation roasting, indium, acid leaching, extraction Liu D, Fan X, Shi Y, Yang K (2018) Leaching Ecological Behavior of Indium from LeadContaining Copper - Matte Using Oxidation Roasting - Leaching Process. Ekoloji …

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A second common refining process is leaching the metal matte into a nickel salt solution, followed by the electro winning of the nickel from. Contact US Nickel Smelting and Refining IFC. Most laterite nickel processers run the furnaces so as to reduce the . Ammonia leach is usually applied to the ore . mon technology for nickel refining. Electro .

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The Outotec nickel matte chloride leaching process is especially suitable for small capacity stand-alone nickel refineries. The matte is leached with hydrochloric acid and oxygen in multiple steps in atmospheric OKTOP® reactors. Oxygen feed prevents reductive conditions and hydrogen formation in the leaching.

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A comparative study of different le aching processes for the extraction ... Ni and Co from a complex matte under different leaching conditions have ... H 2 SO 4 /oxygen pressure leaching, atmospheric FeCl 3 leaching, NH 4 OHNH( / 4) 2 SO 4 pressure leaching are discussed in …

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Jul 11, 2008· The inventors have discovered that an aqueous curing step is capable of rendering an ore amenable to effective leaching by an ammonium carbonate solution containing free ammonia at atmospheric pressure, without the need for conventional physical pre-treatments such as roasting or grinding, thereby offering significant energy savings.

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Atmospheric Ammonia: Sources and Fate June 2000 CENR Air Quality Research Subcommittee 1 INTRODUCTION Gaseous ammonia has long been known to play a key role in atmospheric chemical processes and, following deposition, in the biogeochemical processes that occur in sensitive ecosystems (forests, soils, streams, and coastal waters). Ammonia also ...

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ATMOSPHERIC LEACHING OF MATTE AT THE PORT NICKEL REFINERY. ... (ammonia), leaching temperature, leaching time, and pH on the recovery of nickel and copper from the matte…

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(1) Reductive ammonia leach [12, 13] (2) High-pressure sulfuric acid leach [14] (3) Reduction and hydrochloric acid leach [15] (4) Reductive smelting and sulfuric acid leach [16]. In the first process, an atmospheric ammonia-ammo-nium carbonate leach at 50 C is employed. Manganese dioxide (MnO 2) is reduced to manganese oxide (MnO) or

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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,

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In the present paper, the oxidative ammonia/ammonium sulphate leaching of a synthetic matte has been studied to investigate the extraction behavior of Cu, Ni, and Co. 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.

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Dec 10, 2013· 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 ...

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Nickel Ore Processing. Nickel ore mainly consists of copper-nickel sulfide ore and nickel oxide ore, beneficiation and processing of both methods is completely different. Copper-nickel sulfide ore beneficiation methods, the most important is the flotation, magnetic and re-election is usually secondary dressing method.

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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.

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route. This type of product can be further treated in Caron Process and/or atmospheric acid leaching to produce separate pure nickel and cobalt. In the present work, precipitation behaviour of nickel hydroxide from artificial and pregnant leach solution of Indonesian nickel laterite ore is discussed.

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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.

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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.

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Oct 29, 2014· See more of Boyd Willis Hydromet Consulting on Facebook. Log In. Forgot account? or. Create New Account. Not Now. ... Flowsheet: Base Case: HPAL, Atmospheric Leach (saprolite), MHP, Ammonia Leach, SX/EW Alternative Cases: HPAL, Atmospheric Leach (saprolite), MSP, POX, SX, H2 Reduction, Ni Briquettes ... Ammonia leach of nickel matte…

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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.

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sure. The efforts are aimed at increasing leaching selectivity to iron for minimizing acid consumption as well as acid regeneration in atmospheric leaching processes using hydrochloric and nitric acids [3]-[5]. Separation of cobalt and nickel in pregnant leach solution, either in ammonia …

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Nov 23, 2017· What Happens When You Mix Bleach And Ammonia? Ashish 23 Nov 2017 (Updated: 26 Nov 2019) Listen to this post. Mixing bleach and ammonia causes the release of toxic vapors called chloramines (these are a group of related compounds that are known to irritate the respiratory system). Exposure to these gases can trigger symptoms like watery eyes ...

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HELSINKI 1999 Marja Riekkola-Vanhanen Finnish expert report on best available techniques in nickel production The Finnish Environment 317 FINNISH ENVIRONMENT INSTITUTE

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The Effect of Leaching Time and Ammonia Concentration on the Atmospheric Leaching of Copper Freeman Ntuli1, Edison Muzenda1+, Ishmael Ramatsa1, Mohamed Belaid1, John Kabuba1 1 Faculty of Engineering and the Built Environment, Department of Chemical Engineering, University of Johannesburg, Doornfontein 2026, P O Box 17011, Johannesburg, South Africa

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atmospheric emissions . 61 : vii.2 . liquid effluents : 61 . vii.3 ... falconeridge matte chlorine leach process 86 . 24 . outokumpu sulphate leach process 88 ... pressure carbonyl process 90 . 27 . inco ltd. nickel-copper matte separation process 92 . 28 . s1-{erritt gordon ammonia leach process 93 . 29 . capital and annual operating costs for ...

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