Leaching kinetics of iron from low grade kaolin by oxalic acid solutions

Martínez-Luévanos, Antonia; Rodríguez-Delgado, M. G.; Uribe‐Salas, A.; Pedroza, Francisco Raúl Carrillo; Osuna-Alarcón, J. G.

doi:10.1016/j.clay.2011.01.011

Cited by 84 publications

(41 citation statements)

References 19 publications

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“…The pH of this suspension in the first few days decreased from 7.3 -7.5 to 6.5 and subsequently increased to 7.45 -7.60. This increase is probably due in part to the reductive dissolution of iron hydroxide according to the reaction [9] Fe(OH) 3 …”

Section: Resultsmentioning

confidence: 99%

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Fe(III) Bioreduction in a Kaolin Suspension in Storage

Платова

2014

Glass Ceram

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The removal of iron from kaolin becomes more effective when bioreduction of the iron is added to the technological process. The process can be accelerated by combining as factors the moisture and temperature of the suspension, the pH-Eh of the medium, the composition of the nutrient medium, and the seeding material from a community of microorganisms. In a stagnant moisture regime of a kaolin suspension iron bioreduction is accompanied by the formation of Fe(II)-Fe(III)-containing minerals, and as a result the reduction process stops.

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Section: Resultsmentioning

confidence: 99%

“…The assimilation of iron by an organism is of limited interest for leaching iron from kaolin because iron remains linked with the organism and does not become concentrated in large quantities in the microorganisms [2]. The simplest method of iron dissimilation is to use organic acids that dissolve iron compounds [3].…”

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confidence: 99%

Fe(III) Bioreduction in a Kaolin Suspension in Storage

Платова

2014

Glass Ceram

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“…Most of these are focused on the mechanism of dissolution on hematite and magnetite, testing different acids and experimental conditions [6,7]. Different researchers have used oxalic acid for the dissolution of iron in the kaolin [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the general concepts and fundamentals of the biological dissolution of iron from kaolin clays had been studied by Hosseini et al [15]. Among the organic and inorganic acids [6][7][8][9][10][11][12][13]16], the biological beneficiation, [15,17,18] a combination of both [19][20][21] and the anionic surfactants, the first are the most common reagents to remove iron oxides and oxyhydroxides contained in kaolin clay [22]. However, goethite species have been removed with anionic surfactants, increasing the whiteness index [23].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

et al. 2016

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Abstract:Kaolin is important because it has many applications in the paper, paint-coating, functional filler, extender and pigment industries. This material needs to be bleached by iron leaching to be useful for these applications because this element can be the principal cause of its undesirable coloration. In this work, the kinetics of leaching of iron contained in kaolin clays from the community of Agua Blanca Iturbide, Hidalgo, Mexico, was studied. The leaching experiments were carried out using phosphoric acid as the reagent of leaching for the iron dissolution process. Temperature, acid concentration, and particle size were investigated to determine the most important kinetics parameters during iron leaching. It was determined that the rate of iron dissolution increases with increasing of phosphoric acid concentration, the temperature, and decreased particle size of clay. Data obtained showed that iron dissolution from kaolin clay is due to the diffusion of iron through the product layer. The results revealed that the activation energy of the process was 10.18 kJ¨mol´1.

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“…Low energy consumption, reduced environmental pollution, and the ability to treat low grade ores are amongst attracting features which motivates its application in hydrometallurgical routes. Over the past few decades, numerous pieces of work were conducted on the dissolution of minerals aiming at understanding, controlling, and optimizing effects of process parameters on the extraction yield (Baba, et al, 2007 and2010;Guillermo, et al, 2005;Girgin, et al, 2011;Ozmetin, et al, 1996;Martinez-Luevanos, et al, 2011;Abali, et al, 2007 andDemirkiran and Kunkul, 2008;Uzun and Gulfen, 2007;Ige et al, 2005;Numan and Weaver, 1969). Brown et al, (1966), studied the production of alumina from clay mined at Delaware, USA, by dissolving the clay mineral in nitric acid solution of known concentration.…”

Section: Introductionmentioning

confidence: 99%

Dissolution kinetics and mechanisms of reaction of Udi clay in nitric acid solution

Ajemba¹,

Onukwuli²

2012

AJSIR

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The dissolution kinetics and mechanisms of reaction of Udi clay in nitric acid have been studied. Leaching temperature, acid concentration, particle size, solid-to-liquid ratio, and stirring speed were selected as process parameters. It was observed that the dissolution rate increased with decreasing particle size and solid-to-liquid ratio and increased with stirring speed, acid concentration, and leaching temperature. (S/L) -0.3104 (w) 0.2709 exp (-2621/T) t. The activation energy of the process was determined to be 21.791kJ/mol. The experimental data were tested by graphical and statistical methods and it was found out that the above model best fitted the data.

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Leaching kinetics of iron from low grade kaolin by oxalic acid solutions

Cited by 84 publications

References 19 publications

Fe(III) Bioreduction in a Kaolin Suspension in Storage

Fe(III) Bioreduction in a Kaolin Suspension in Storage

Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

Dissolution kinetics and mechanisms of reaction of Udi clay in nitric acid solution

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