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  • Copper Ore Hydrometallurgy and Pressure Leaching-Copper-

    Copper hydrometallurgy is a branch of metallurgy method to extract copper directly from those difficult-to-concentrate copper oxide ore. Traditional copper hydrometallurgy process typically consists of atmospheric leaching, solvent extraction (SX) and electro-winning (EW). It can produce either copper cathode or copper sulphate crystal.

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  • Metallurgy - Leaching | Britannica

    Leaching is carried out by two main methods: simple leaching at ambient temperature and atmospheric pressure; and pressure leaching, in which pressure and temperature are increased Metallurgy - Metallurgy - Leaching: Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid.

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  • Method for leaching zinc concentrate in atmospheric ...

    Jan 22, 2002 · A method for leaching zinc concentrate in atmospheric conditions in the presence of trivalent iron, comprising feeding the zinc concentrate and a sulfuric acid solution into a leaching step under atmospheric conditions where in addition to trivalent iron, there are also jarosite nuclei, where the sulfuric acid content in the leaching step is maintained within 10-40 g/l, and the temperature in the .

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  • Leaching of Zinc Oxide in Acidic Solution.jp

    Leaching of Zinc Oxide in Acidic Solution Takashi Yoshida MS Zinc Co., Ltd., Tokyo 105-0004, Japan Leaching mechanism of zinc oxide is important not only to understand zinc smelting process but also to develop of new zinc recycling process. Recycling of zinc is mainly done by treatment of electric arc furnace dust (EAF dust).

    • Published in: Materials Transactions · 2003Authors: Takashi YoshidaAbout: Mass transfer · Leaching · ZincGet Price
    • Leaching reagents / Applications / Home - Pionera

      Atmospheric leaching The recovery of gold, copper, nickel, zinc and other metals can be increased through the use of our PIONERA BioPolymer. Obtain additional benefits of using PIONERA BioPolymers

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    • Outotec direct leaching application in J China - SciELO

      Atmosphere direct leaching of zinc concentrates and neutral leach residues. Leaching of zinc concentrates is based on the oxidation of zinc sulphide in an acidic environment. The reaction system is of a complex nature and not fully understood.

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    • Comparison of Direct Pressure Leaching with Atmospheric ...

      Comparison of Direct Pressure Leaching with Atmospheric Leaching of Zinc Concentrates. K.R. Buban. Dynatec Corporation Metallurgical Technologies Division 8301–113 Street Fort Saskatchewan, Alberta, Canada T8L 4K7. Search for more papers by this author. M.J. Collins.

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    • HYDROMETALLURGICAL PROCESSING OF BLAST .

      zinc leaching while minimum amount of iron is transferred into solution. Ideal conditions for selective leaching were achieved using 50°C and 1 - 0,5M sulfuric acid solution. Higher temperature and concentration caused higher iron leaching ratio. With optimal conditions, iron recovery was in the range 5 –

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    • Zinc Concentrate Direct Leaching - Outotec

      Outotec® Zinc Concentrate Direct Leaching. Choose a highly cost-effective and efficient zinc concentrate direct leaching solution. Outotec's zinc direct leaching process enables efficient zinc and by-product recovery from a wide range of primary zinc sulfides. Direct leaching requires no investment in a roaster or acid plant,...

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    • (PDF) Atmospheric zinc concentrate leaching of Outokumpu ...

      In the case of Boliden Kokkola, the atmospheric leaching technology was inte-grated as a part of a conventional roast-leach-electrowinning process and it has proven to be good in efficiency and ...

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    • New Developments in the Leaching of Zinc Concentrates ...

      Direct Leaching of Zinc Concentrates. • Zinc Pressure Leaching. –Developed by Sherritt and Cominco (now Teck) and installed in 1981 in Trail, Canada –Now used in a number of zinc plants all over the world –Conditions are ~150 C and 12 atmospheres of pressure. • Atmospheric Zinc Leaching.

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    • ZINC RICH PRIMERS FOR CORROSION PROTECTION

      Zinc-rich coatings are used by many industries for the corrosion protection of steel substrates. Uses include highway and infrastructure, industrial and automotive applications. These coating materials have demonstrated improved atmospheric corrosion performance when compared to carbon steels protected only by spray applied

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    • Zinc smelting - Wikipedia

      Zinc smelting is the process of converting zinc concentrates (ores that contain zinc) into pure zinc. Zinc smelting has historically been more difficult than the smelting of other metals, e.g. iron, because in contrast, zinc has a low boiling point .

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    • Zinc smelting - Wikipedia

      The calcine is first leached in a neutral or slightly acidic solution (of sulfuric acid) in order to leach the zinc out of the zinc oxide. The remaining calcine is then leached in strong sulfuric acid to leach the rest of the zinc out of the zinc oxide and zinc ferrite.

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    • Separation of elemental sulfur from zinc concentrate ...

      [1]. Therefore, a hydrometallurgical direct leaching process was developed and commercialized to avoid the air pollution concerns related to the high temperature pyrometallurgical methods [2]. During the entire direct leaching process, sulfur in the zinc sulfide ores transfers into .

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    • Studies on gas-liquid mass transfer in atmospheric ...

      In this work, the mass transfer of oxygen in the atmospheric leaching process of zinc sulphide was investigated. Four new experimental apparatus items suitable for this purpose were designed and developed. The experiments conducted with the water model were focused on volumetric mass transfer, gas and liquid flow patterns, gas dispersion and

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    • Atmospheric oxygen-rich direct leaching behavior of zinc ...

      In the 1990s, the atmospheric direct leaching (ADL) process of zinc sulphide concentrate was developed [3,4]. Actually, the ADL process is operated under oxygen-rich conditions, which is similar to low-temperature pressure leaching know-how [5ã­7]. The ADL process has been practiced at an industrial scale [8,9].

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      • High Pressure Acid Leach - Caldera Engineering

        High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the laterite ore.

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      • Ultrasound effects on zinc recovery from EAF dust by ...

        Apr 11, 2015 · Franklinite is a refractory phase that is difficult to leach and represents the main obstacle in conventional hydrometallurgy processing. Atmospheric leaching with different sulfuric acid concentrations (0.2–2.0 M) at two temperatures (323 and 353 K) was performed. The tests were conducted using both conventional and ultrasound-assisted leaching.

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      • Kinetics of zinc sulfide concentrate direct leaching in ...

        Generally, the kinetic model of zinc sulfide leaching is affected by different factors, such as agitation rate, and minerals composition in ore [17]. Even though all these studies provide valuable background on sphalerite dissolution kinetics, their results do not cover the dissolution kinetics during direct atmospheric leaching process.

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      • LEACHING OF ZINC OXIDE IN AQUEOUS SULPHURIC ACID .

        LEACHING OF ZINC OXIDE IN AQUEOUS SULPHURIC ACID SOLUTIONS Jandová J.1, Prošek T1., Maixner J.2 1 Prague Institute of Chemical Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic 2 Prague Institute of Chemical Technology, Central Laboratories, Technická 5, 166 28 Prague 6, Czech Republic

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      • Direct sulfuric acid leaching of zinc sulfide concentrate ...

        The use of ozone as an oxidant for the direct leaching of zinc sulfide (sphalerite) concentrate in sulfuric acid medium under atmospheric pressure was explored. The influence of acid concentration, feed gas injection rate, particle size distribution, stirring speed, temperature and slurry density on zinc extraction efficiency was examined.

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      • Atmospheric oxygen-rich direct leaching behavior of zinc ...

        existing zinc plants, or in the design of new facilities. Although the ZPL process makes the zinc industries more competitive, it needs high-cost autoclave and thereby its application is limited. In the 1990s, the atmospheric direct leaching (ADL) process of zinc sulphide concentrate was developed [3,4].

        • Published in: Transactions of Nonferrous Metals Society of China · 2013Authors: X U Zhifeng · Qingzheng Jiang · Chengyan WangAffiliation: Jiangxi University of Science and TechnologyAbout: MineralogyGet Price
        • Kinetics of sphalerite leaching by sodium nitrate in ...

          increase in the zinc extraction. However, at a high acid concentration (2.0 and 2.5 M), the effect is not significant. Zinc leaching increased from 47 to 74.11% after 150 min as the acid concentration was increased from 0.5 to 2.0 M. With an increase in the acid concentration to 2.5 M, the dissolution

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        • Determination of effective parameters in pilot plant scale ...

          The atmospheric leaching is performed under normal pressure condition (Dutrizac, 2006) and the added ferric sulfate oxidizes zinc sulfide (Eq. 4). Also, adding other chemical oxidant caused oxidization of the ferrous sulfate and

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        • Modeling the kinetics of the zinc pressure leaching ...

          In the field of hydrometallurgy, the industrial uptake of leaching models has been overlooked partially due to the lack of universal models. A model developed for one plant cannot easily be transferred for the application of a different plant without redesigning the leaching kinetics in the code.

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        • Sherritt International - Operations - Technologies ...

          Leaching of nickel-copper matte and recovery of platinum group metals Sherritt's matte leach process uses sulphuric acid leaching in a combination of atmospheric and/or pressure leaching steps to quantitatively dissolve nickel and copper in nickel-copper matte and produce a high-grade platinum group metal (PGM) concentrate for refining.

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        • Modeling the kinetics of the zinc pressure leaching ...

          The model is further verified through bench scale pressure leaching experiments where 94 % of the zinc is extracted within 90 minutes using a concentrate sample from the same industrial plant.

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        • Home - Home | Albion Process

          Page Content. The Albion Process™ is a combination of ultrafine grinding and oxidative leaching at atmospheric pressure. The feed to the Albion Process™ are base or precious metal concentrates. The sulphides in the feed are oxidised and liberated, allowing the wanted metals to be recovered by conventional means.

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        • Copper Ore Hydrometallurgy and Pressure Leaching-Copper-

          Copper hydrometallurgy is a branch of metallurgy method to extract copper directly from those difficult-to-concentrate copper oxide ore. Traditional copper hydrometallurgy process typically consists of atmospheric leaching, solvent extraction (SX) and electro-winning (EW). It can produce either copper cathode or copper sulphate crystal.

          Get Price
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