CONTACT US

Our Address

Science Avenue, High-tech Zone, Zhengzhou City, Henan Province, China

  • atmospheric ammonia leach matte

    Atmospheric Ammonia Leach Matte. Atmospheric Ammonia Leach Matte. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and

  • Atmospheric acid leaching of nickel-copper matte from ...

    The leaching behaviour of nickeli?½copper matte in an acidici?½copper 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 ...

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

    The effects of ammonia concentration, leaching tempera- ... the repulping stage is basically an atmospheric leach stage in which the matte containing mostly Ni and Cu is leached in copper-spent ...

  • (PDF) ATMOSPHERIC LEACHING OF MATTE AT THE PORT NICKEL ...

    The leaching parameters studied were concentration of ammonia (1.5, 2.0, 2.5, and 3.0 M), leaching time (0–270 min, at 15 min sampling interval), leaching temperatures (50°C, 60°C, and 70°C ...

  • The Effect of Leaching Time and Ammonia Concentration on ...

    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 ...

  • Ammonia - Environmental Fate

    Ammonia reacts rapidly in the atmosphere with both sulfuric and nitric acids to form fine particles(4). In most of the US the majority of aerosol ammonium is associated with sulfate ion(4). Once released into the atmosphere, ammonia is returned to the surface as either gaseous ammonia or

  • Parametric Effects on Leaching Behavior of Nickel-Copper ...

    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. AFOLABI2 1Department of Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg, South Africa 2Department of Civil and Chemical Engineering, College of Science,

  • Parametric Effects on Leaching Behavior of Nickel-Copper ...

    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. AFOLABI2 1Department of Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg, South Africa 2Department of Civil and Chemical Engineering, College of Science,

  • Atmospheric acid leaching of nickel-copper matte from ...

    The leaching behaviour of nickeli?½copper matte in an acidici?½copper 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 ...

  • Oxidative dissolution of nickel matte in dilute sulfuric ...

    Nickel matte (Ni 3 S 2) is the most common feedstock for producing nickel oxide and nickel metal in associated refineries.Nickel matte is produced from sulfide or laterite ores, and contains around 73 wt% nickel. This study investigated the dissolution parameters of nickel matte in dilute sulfuric acid media in the presence of air as oxidant with the goal of presenting a cost-effective process ...

  • Ammonia - Environmental Fate

    Ammonia reacts rapidly in the atmosphere with both sulfuric and nitric acids to form fine particles(4). In most of the US the majority of aerosol ammonium is associated with sulfate ion(4). Once released into the atmosphere, ammonia is returned to the surface as either gaseous ammonia or

  • Outotec's innovative nickel matte leach process. - Free ...

    Nov 01, 2014  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.

  • 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

  • Efficient and selective recovery of Ni, Cu, and Co from ...

    The effects of (NH 4) 2 S 2 O 8 and NH 3 H 2 O concentrations, leaching time, and leaching temperature on the metal extraction efficiency were systematically investigated. During the oxidative ammonia leaching process, the metal extraction efficiencies of Ni 81.07%, Cu 93.81%, and Co 71.74% were obtained under the optimal conditions.

  • Nitrogen: Why Managing it Matters Active AgriScience

    As a greenhouse gas, nitrous oxide is around 300 times more potent than carbon dioxide (CO 2) and can remain in the atmosphere for over 100 years. Not only does nitrogen loss impact crop yield potential, it is also a huge environmental concern.

  • :: Outotec’s Innovative Nickel Matte Leach Process

    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.

  • Atmospheric Process - The Ocean Notion

    The modeling atmospheric processes is critical in advancing understanding of those processes. Scientists can perform model simulations with historical data of climate sets as input to predict future variations and estimate impacts of atmospheric processes on human–environment interactions. Since last century, scientists have developed ...

  • Ammonia Detected in Earth's Atmosphere for First Time ...

    Dec 22, 2016  Surprisingly, they found atmospheric ammonia about 7.5 miles to 9.3 miles (12 to 15 km) above sea level in the same area and time period in

  • Biosphere - The nitrogen cycle Britannica

    Biosphere - Biosphere - The nitrogen cycle: Nitrogen is one of the elements most likely to be limiting to plant growth. Like carbon, nitrogen has its own biogeochemical cycle, circulating through the atmosphere, lithosphere, and hydrosphere (Figure 5). Unlike carbon, which is stored primarily in sedimentary rock, most nitrogen occurs in the atmosphere as an inorganic compound (N2).

  • Understanding nitrogen in soils

    Atmospheric N is the major reservoir for N in the N cycle (air is 79 percent N2 gas). ... (H2) to form ammonia (NH3). Anhydrous ammonia is then used as a starting point in the manufacture of other nitrogen fertilizers. ... Leaching is the loss of soluble NO 3--N as it moves with soil water, generally excess water, below the root zone. Nitrate-N ...

  • HEALTH EFFECTS of AMMONIA - TFI

    Ammonia is a naturally occurring chemical in the atmosphere, as well as an essential man-made chemical. It is represented by the chemical formula nH 3. Ammonia in this form is also known as ammonia gas or anhydrous (“without water”) ammonia. At room temperature, ammonia is a colorless, pungent-smelling gas and is lighter than air.

  • Atmospheric acid leaching of nickel-copper matte from ...

    The leaching behaviour of nickeli?½copper matte in an acidici?½copper 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 ...

  • Efficient and selective recovery of Ni, Cu, and Co from ...

    The effects of (NH 4) 2 S 2 O 8 and NH 3 H 2 O concentrations, leaching time, and leaching temperature on the metal extraction efficiency were systematically investigated. During the oxidative ammonia leaching process, the metal extraction efficiencies of Ni 81.07%, Cu 93.81%, and Co 71.74% were obtained under the optimal conditions.

  • Biosphere - The nitrogen cycle Britannica

    Biosphere - Biosphere - The nitrogen cycle: Nitrogen is one of the elements most likely to be limiting to plant growth. Like carbon, nitrogen has its own biogeochemical cycle, circulating through the atmosphere, lithosphere, and hydrosphere (Figure 5). Unlike carbon, which is stored primarily in sedimentary rock, most nitrogen occurs in the atmosphere as an inorganic compound (N2).

  • 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

  • Atmospheric acid leaching of nickel-copper matte from ...

    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 is leached in copper-spent electrolyte from the tank house, resulting in dissolution of nickel and precipitation of ...

  • :: Outotec’s Innovative Nickel Matte Leach Process

    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- 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,

  • HEALTH EFFECTS of AMMONIA - TFI

    Ammonia is a naturally occurring chemical in the atmosphere, as well as an essential man-made chemical. It is represented by the chemical formula nH 3. Ammonia in this form is also known as ammonia gas or anhydrous (“without water”) ammonia. At room temperature, ammonia is a colorless, pungent-smelling gas and is lighter than air.

  • Ammonia Detected in Earth's Atmosphere for First Time ...

    Dec 22, 2016  Surprisingly, they found atmospheric ammonia about 7.5 miles to 9.3 miles (12 to 15 km) above sea level in the same area and time period in

  • Environmental Impacts of Nitrogen Use in Agriculture

    Natural losses of nitrogen, in addition to nitrate leaching, occur through ammonia volatilization and denitrification. Ammonia volatilization occurs when manure or an ammonia-based fertilizer (particularly urea) are applied to the surface of the soil without mixing them into the soil.

  • Inherent Factors Affecting Soil Nitrogen

    leaching, runoff, or denitrification. Organic matter decomposes releasing N more quickly in warm humid climates and slower in cool dry climates. This N release is also quicker in well aerated soils and much slower on wet saturated soils. Nitrogen can readily leach out of the root zone in nitrate-N form. The potential for leaching is

  • Ammonia in the atmosphere: a review on emission sources ...

    Aug 28, 2013  Gaseous ammonia (NH3) is the most abundant alkaline gas in the atmosphere. In addition, it is a major component of total reactive nitrogen. The largest source of NH3 emissions is agriculture, including animal husbandry and NH3-based fertilizer applications. Other sources of NH3 include industrial processes, vehicular emissions and volatilization from soils and oceans.

  • Ammonia CADDIS Volume 2 US EPA

    Newton N, Bartsch M (2006) Lethal and sublethal effects of ammonia to juvenile Lampsilis mussels (Unionidae) in sediment and water-only exposures. Environmental Toxicology and Chemistry 26:2057-2065. NOAA (2000) Atmospheric Ammonia: Sources and Fate. A Review of Ongoing Federal Research and Future Needs (PDF). Committee on the Environment and ...

  • OPERATION OF AMMONIA REFRIGERATION SYSTEMS

    Commercially, ammonia is made by combining free nitrogen and hydrogen gases under high pressure and temperature in the presence of a catalyst. The process most commonly used is the Harber-Bosch method. Anhydrous ammonia is the liquid form of pure ammonia gas, technically water-free, and the substance used universally as an industrial refrigerant.

  • :: Outotec’s Innovative Nickel Matte Leach Process

    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.

  • Parametric effects on leaching behavior of nickel-copper ...

    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 it contains 23% copper, 37% nickel and 1.1% ferrous compound.

  • Ammonia CADDIS Volume 2 US EPA

    Newton N, Bartsch M (2006) Lethal and sublethal effects of ammonia to juvenile Lampsilis mussels (Unionidae) in sediment and water-only exposures. Environmental Toxicology and Chemistry 26:2057-2065. NOAA (2000) Atmospheric Ammonia: Sources and Fate. A Review of Ongoing Federal Research and Future Needs (PDF). Committee on the Environment and ...

  • 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,

  • 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 in the atmosphere: a review on emission sources ...

    Aug 28, 2013  Gaseous ammonia (NH3) is the most abundant alkaline gas in the atmosphere. In addition, it is a major component of total reactive nitrogen. The largest source of NH3 emissions is agriculture, including animal husbandry and NH3-based fertilizer applications. Other sources of NH3 include industrial processes, vehicular emissions and volatilization from soils and oceans.

  • Marja Riekkola-Vanhanen Finnish expert report on best ...

    The Finnish Environment 317 7 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa a a a a General Information 1.1 General Nickel is a silver white metal with typical metallic ...

  • Strong and Steady - using lab analysis for regulating ...

    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. Solid and liquor samples are collected from the leach circuit every 2 to 12 hours (depending on location) and analyzed in the lab for Nickel, Copper, Cobalt, Iron, Ammonia and Amsul ...

  • OPERATION OF AMMONIA REFRIGERATION SYSTEMS

    Commercially, ammonia is made by combining free nitrogen and hydrogen gases under high pressure and temperature in the presence of a catalyst. The process most commonly used is the Harber-Bosch method. Anhydrous ammonia is the liquid form of pure ammonia gas, technically water-free, and the substance used universally as an industrial refrigerant.

  • Nitrogen in Sewage Systems: The Chemical Element Human ...

    Nitrogen is a very cosmopolitan chemical element; it occurs in many forms in the physical environment, notably the nitrogen gas that makes up about 78% of the atmosphere. It also combines with oxygen to form oxides and ionic molecules like nitrate and nitrite, and with hydrogen to form ammonia.

  • EP1587964B1 - Process for nickel and cobalt extraction ...

    EP1587964B1 EP04706573A EP04706573A EP1587964B1 EP 1587964 B1 EP1587964 B1 EP 1587964B1 EP 04706573 A EP04706573 A EP 04706573A EP 04706573 A EP04706573 A EP 04706573A EP 1587964 B1 EP1587964 B1 EP 1587964B1 Authority EP European Patent Office Prior art keywords nickel process according cobalt ore kiln Prior art date 2003-01-30 Legal status (The legal

  • Are Nitrogen Stabilizers Worth Using? 3 Factors to ...

    Volatilization: Ammonium (NH4) converts to ammonia (NH3) gas which is released to the atmosphere; Leaching: Nitrate, which is negatively charged like soil particles and not well retained by the ...

  • Chapter 3: Fertilizers as water pollutants

    The symptoms and impacts of eutrophication are: Increase in production and biomass of phytoplankton, attached algae, and macrophytes. Shift in habitat characteristics due to change in assemblage of aquatic plants. Replacement of desirable fish (e.g. salmonids in western countries) by less desirable species. Production of toxins by certain algae.

  • Sources of Eutrophication World Resources Institute

    The excess nutrients are lost through volatilization (when nitrogen vaporizes in the atmosphere in the form of ammonia), surface runoff (Figure 2), and leaching to groundwater. On average, about 20 percent of nitrogen fertilizer is lost through surface runoff or leaching into groundwater (MA 2005) .