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reaction kinetics sulfuric acid leaching

  • Kinetics of Sulfuric Acid Leaching of Brass

    Effect of Temperature and Acid Concentration: The effect of temperature on the leaching behavior of copper and zinc is shown by the data in Figures 1 through 4. In these experiments, leaching solutions were well stirred at 550 rpm and open to air. “Fraction Extracted” refer to that portion of the total copper and zinc that has been dissolved at time t.

  • Kinetics of reduction leaching of manganese dioxide ore ...

    The leaching kinetics of reductive leaching of manganese from manganese dioxide ores (MDO) in dilute sulfuric acid in the presence of Phytolacca americana powder (PAP) was investigated. The effects of stirring speed, leaching temperature and leaching time, particle size, weight ratio of PAP to MDO (C W) and sulfuric acid concentration (C H) on the leaching efficiency of manganese were studied.

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  • Kinetics of sulfuric acid leaching of low-grade zinc ...

    The results of a leaching kinetics study of low-grade zinc silicate ore with sulfuric acid are presented. Effect of ore particle size, reaction temperature, and acid concentration on

  • Cited by: 191
  • Kinetics of sulphuric acid leaching of a zinc silicate calcine

    Kinetics of sulphuric acid leaching of a zinc silicate calcine A.D. Souzaa, ... 51.9 ± 2.8kJ/mol and a reaction order of 0.64 ± 0.12 with respect to sulphuric acid, which are likely to be a consequence of the parallel nature of diffusion and chemical reaction in porous solids.

  • Kinetics of sphalerite leaching by sodium nitrate in ...

    Kinetics of Sphalerite leaching by Sodium Nitrate in Sulfuric Acid M. Hasani, S.M.J. Koleini and A. Khodadadi* ... Leaching, Reaction Kinetics, Modeling. 1. Introduction Sphalerite is the chief zinc ore, and is usually ... Kinetics of sphalerite leaching by sodium nitrate in sulfuric acid ...

  • Dissolution Kinetics of Malachite in Sulphuric Acid | D ...

    Request PDF on ResearchGate | Dissolution Kinetics of Malachite in Sulphuric Acid | A kinetic study of the sulphuric acid leaching of oxidised copper ore, primarily malachite, was carried out. The ...

  • (PDF) Leaching of copper oxide with different acid solutions

    Leaching of copper oxide with different acid solutions. ... the kinetics of acid leaching of a spent catalyst containing CuO was investigated. ... Three hours of leaching duration, 1 N sulphuric ...

  • Fractal kinetic characteristics of hard-rock uranium ...

    Sulfuric acid leaching is a non-selective process. During the leaching process, mineral impurities are also dissolved in the leaching solution, and those minerals exist in the solution in ionic state or precipitate produced by plasma in combination with sulfuric acid root. The main chemical reaction is as follows:

  • Author: Sheng Zeng, Jinzhu Li, Kaixuan Tan, Shuwen Zhang
  • Leaching of Zinc Oxide in Acidic Solution - jim.or.jp

    the kinetic of the leaching reaction is basically mixtures of chemical reactions and mass transportations. When the chemical reactions of eqs. (3) and (4) occur fast enough the leaching reaction is controlled by mass transportations. If leaching reactions of zinc oxide in hydrochloric acid and sulfuric acid solutions are controlled by the mass ...

  • Published in: Materials Transactions · 2003Authors: Takashi YoshidaAbout: Mass transfer · Leaching · Zinc
  • Acid Alcohol Leaching of Apatite - 911metallurgist

    The acid-alcohol reaction is somewhat similar to the aforementioned aqueous sulfuric acid leaching reaction, but the solvent is methanol instead of water. The balanced reaction for apatite containing fluoride is: The calcium sulfate crystallizes in the hemihydrate form.

  • Kinetics of hydrochloric acid leaching of smithsonite ...

    The experimental data conformed well to the shrinking core model, and the dissolution rate was found to be controlled by surface chemical reaction. From the leaching kinetics analysis it can be demonstrated that hydrochloric acid can easily and readily dissolve zinc present in the smithsonite ore, without any filtration problems.

  • Leaching and Kinetic Study on Pressure Oxidation of ...

    Jun 23, 2017 · Abstract. The leaching of copper from chalcopyrite in H 2 SO 4 solution under pressure-oxidative conditions and its kinetics were investigated in this study. Leaching variables that affect the rate of copper dissolution from chalcopyrite are agitation speed (300–900 rpm), total pressure (0.8–2.0 MPa), temperature (160–180 °C), and sulfuric acid concentration (0.1–2.0 M).

  • KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

    concentrate decreases the leaching rate of zinc up to 13%, while the presence of 10% pyrite increases zinc dissolution [9]. On the other hand, Souza et al. [10], suggested that the iron content has small affect on the leaching kinetics of the silicate concentrate by sulphuric acid

  • Published in: Journal of Mining and Metallurgy, Section B · 2012Authors: M Sokic · Branislav Markovic · Vladislav Matkovic · Dragana Zivkovic · Nada StrbacAbout: Kinetics · Sodium nitrate
  • The Leaching of Hematite in Acid Solutions

    The reactions of hematite in aqueous hydrochloric acid, perchloric acid, and sulfuric acid solutions with or without the addition of common or uncommon salts were studied using monosized particulates in a well-stirred reactor and dilute solid concentration to obtain fundamental details of the reaction kinetics.

  • Published in: Metallurgical and Materials Transactions B-process Metallurgy and Materials ProcessiAuthors: Hiroshi Majima · Yasuhiro Awakura · Takumi MishimaAffiliation: Kyoto University · LIMINGAbout: Chemical kinetics · Hematite · Sulfuric acid · Double layer
  • Dissolution Kinetics of CuSiO (Chrysocolla) - Weebly

    The objective of the present study was to model the reaction kinetics for the dissolution of chrysocolla by sulfuric acid leach solutions. This study used atomic adsorption spectroscopy to ana-lyze the concentration of copper present at periodic time intervals through the controlled reaction of sulfuric acid

  • Srećko Stopi Sulphuric Acid Leaching of the Serbian Nickel ...

    Srećko Stopić et al.: Sulphuric Acid Leaching of the Serbian Nickel Lateritic Ore Laterites are oxide ores widely distributed in the equatori-al regions. Lateritic deposits usually consist of three layers, namely the limonitic, the saprolitic and garnieritic layer. It is known that 54 % of the total reserves of nickel are found in laterites [1].

  • Sulphuric acid leaching of zinc and copper from Nigerian ...

    Sulphuric acid with hydrogen peroxide leaching These experiments were conducted to determine the effect of hydrogen peroxide concentration on the dissolution rates in sulphuric acid. Equal volumes of 50 ml each of sulphuric acid and hydrogen peroxide were introduced into the reactor vessel. At the reaction temperature, 2 g of ore with a particle

  • Kinetics of sulphuric acid leaching of titanium from ...

    the leaching kinetics analysis indicated that both acid concentration and temperature were the most significant parameters for the leaching process. And, the titanium leaching reaction rate was controlled by the diffusion of reactants through the residual layer. Keywords: anatase ore, kinetics, sulphuric acid, leaching, titanium dioxide 1 ...

  • 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.

  • (PDF) Kinetics of hydrochloric acid leaching of ...

    (6), which is semi empirical mathe 7. Abdel Aal, E.A., Kinetics of Sulfuric Acid Leaching of matical model symbolizing the process. The order of Low Grade Zinc Silicate Ore, Hydrometallurgy, 2010, the reaction with respect to HCl concentration, solid vol. 55,no. 3, pp. 37–49.

  • Leaching of brannerite in the ferric sulphate system ...

    conditions, investigating the effect of varying the temperature, sulphuric acid concentration, ferric concentration, particle size and agitation rate. The Arrhenius plot for uranium produced from this data had a typical shape for a leaching reaction (Gupta, 2003). At lower temperatures between 15 and

  • Sulfuric Acid Leaching of Smelter Matte

    The major differences between the two acids was the sulfuric acid concentration and the trace amounts of impurities such as iron, calcium, other metals, and a small quantity of organic material contained in the black acid. Black acid was 94 to 96 pct sulfuric acid and reagent-grade sulfuric acid was 95 to 98 pct sulfuric acid.

  • Leaching kinetics of neodymium in sulfuric acid from E ...

    Leaching kinetics of neodymium in sulfuric acid from E-scrap of NdFeB permanent magnet 707 Korean J. Chem. Eng.(Vol. 31, No. 4) powders was leached out, but the effect of chemical reaction did

  • Published in: Korean Journal of Chemical Engineering · 2014Authors: Hosung Yoon · Chuljoo Kim · Kyeong Woo Chung · Sujeong Lee · Aram Joe · YanghAffiliation: Soonchunhyang UniversityAbout: Leaching
  • The Effect of Zinc Ion Concentration and pH on the ...

    of stirring speed. Finally, Abdel-Aal (2000) studied the effect of particle size on kinetics of sulphuric acid leaching of low grade zinc silicate ore. The results showed that decrease in particle size yielded an increase in reaction kinetics. This was due to the reduced particle

  • Leaching of brannerite in the ferric sulphate system ...

    conditions, investigating the effect of varying the temperature, sulphuric acid concentration, ferric concentration, particle size and agitation rate. The Arrhenius plot for uranium produced from this data had a typical shape for a leaching reaction (Gupta, 2003). At lower temperatures between 15 and

  • The Effect of Zinc Ion Concentration and pH on the ...

    of stirring speed. Finally, Abdel-Aal (2000) studied the effect of particle size on kinetics of sulphuric acid leaching of low grade zinc silicate ore. The results showed that decrease in particle size yielded an increase in reaction kinetics. This was due to the reduced particle

  • Kinetics of Leaching Vanadium with Sulfuric Acid from ...

    ηA kinetic study of the leaching of stone coal ore with sulfuric acid has been investigated. The effects of the stirring speed, particle sizes of stone coal, acid concentration, leaching temperature and acid-ore ratio on the leaching rate of vanadium were examined. It was found that the leaching rate of vanadium was significantly influenced by leaching temperature.

  • Kinetics of copper dissolution - Iowa State University

    annually in the mid-1960's. Production of copper by leaching is expected to increase fivefold by 1975 (6) . Investigations made on leaching various copper minerals have shown that several copper sulfide minerals are soluble to some extent in sulfuric acid solutions containing ferric sul­ fate and that many copper oxide minerals are soluble in

  • Authors: Rogelio Andres PanlasiguiAffiliation: Iowa State UniversityAbout: Extraction · Copper · Chemical kinetics
  • Dissolution kinetics of a lateritic nickel ore in ...

    Tevfik Agacayak and Veysel Zedef: Dissolution kinetics of a lateritic nickel ore in sulphuric acid medium 36 The effects of leaching temperature The leaching process was carried out in the temperature ranging from 40 to 96 °C with 2.0 M sulphuric acid solution at

  • Srećko Stopi Sulphuric Acid Leaching of the Serbian Nickel ...

    Srećko Stopić et al.: Sulphuric Acid Leaching of the Serbian Nickel Lateritic Ore Laterites are oxide ores widely distributed in the equatori-al regions. Lateritic deposits usually consist of three layers, namely the limonitic, the saprolitic and garnieritic layer. It is known that 54 % of the total reserves of nickel are found in laterites [1].

  • (PDF) The kinetics of zinc silicate leaching in sodium ...

    Bodas (1996) for an efficient acid leaching of such materials, the content of the studied the leaching kinetics of two different zinc ores and noticed gangue minerals needs to be reduced which is usually attained by a that the leaching kinetics was diffusion-controlled with activation concentration step.

  • Kinetics Etude of the Experimental Leaching of Sphalerite ...

    sulfuric acid is the best successful leaching agent [2]. The direct leaching of zinc from a sphalerite concentrate with oxygen as an oxidant in sulfuric acid solutions was examine by Yan et al. [3]. A study was achieved to evaluate the influence of different factors such as particle size, reaction time, and temperature on zinc dissolution.

  • Leaching Kinetics of Praseodymium in Sulfuric Acid of Rare ...

    Leaching Kinetics of Praseodymium in Sulfuric Acid of Rare Earth Elements (REE) Slag Concentrated by Pyrometallurgy from Magnetite Ore 47 Korean Chem. Eng. Res., Vol. 53, No. 1, February, 2015 the leaching [18,19] that has a shape of a spherical particle, the chemical reaction may be expre ssed in the following Eq. (2). (2) However, the ...

  • Kinetics of Simultaneous Dissolution of Zinc and Manganese ...

    Three temperatures (40°C, 50°C and 60°C) were considered for the study of kinetics of leaching of manganese and zinc in sulfuric acid media, the other leaching variables were kept constant. Hydrogen per oxide was added to the solution as a reducing agent.

  • Authors: Majharul Haque Khan · A S W KurnyAffiliation: Bangladesh University of Engineering and TechnologyAbout: Kinetics
  • 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.

  • LEACHING KINETICS OF COPPER FROM CHALCOPYRITE

    These non-elementary reaction steps also give a more complete understanding of the regeneration process. The present study provides an extensive investigation into the leaching kinetics of copper from bulk chalcopyrite concentrate in nitrous-sulfuric acid with an emphasis on

  • Published in: Physicochemical Problems of Mineral Processing · 2014Authors: Ozge Gok · Corby G Anderson · Gorkem Cicekli · E Ilknur CocenAffiliation: Dokuz Eylul University · Colorado School of MinesAbout: Kinetics · Chalcopyrite
  • Kinetics of sulphuric acid leaching of a zinc ... - DeepDyve

    Dec 01, 2007 · Recent developments of acid leaching and solvent extraction of zinc silicate ores have produced renewed commercial interest. However, the leaching kinetics of these concentrates has received little attention. This work, therefore, addresses the leaching of a zinc silicate concentrate in sulphuric acid.

  • Published in: Hydrometallurgy · 2007Authors: Adelson Dias De Souza · Pablo Dos Santos Pina · E V O Lima · C A Da Silva · VersiaAffiliation: Votorantim GroupAbout: Leaching · Kinetics · Sulfuric acid · Willemite · Activation energy · Particle size
  • Kinetics of Atmospheric Acid Leaching of a Limonitic Laterite

    A limonitic nickel laterite was leached by sulfuric acid at atmospheric pressure. Kinetics of leaching within the temperature range of 75-100°C was studied. The leaching kinetics followed the shrinking core model. The diffusion through the liquid film could be negligible under the agitation speed of 600rpm or above. Surface chemical reaction was the rate-controlling step.

 

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