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Statistical Treatment of Bleaching Kaolin by Iron Removal SciELO
In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the dissolution of iron from the kaolin mineral. Our goal was ferric iron solubilization and its reduction to ferrous iron to improve the iron removal
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Characterization and beneficiation studies for the removal of iron
KEYWORDS: china clay, characterization, iron, magnetic separation, leaching, oxalic acid, Jharkhand State,. India. China clay is a naturally occurring industrial clay containing mainly kaolinite (Al2Si2O5 (OH)4) as the principal clay mineral. It has a range of applica tions, being widely used in ceramics, pottery, paper, paints
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Model for Predictive Analysis of Heat Absorbed by Oxalic Acid
[14] used 0.190.48M oxalic acid to dissolve hydrated iron oxide. Iron dissolution was found. [14] to reach 90% for a 20% slurry within 60mins. using 0.19M oxalic for the finer fraction (<. 150μm) containing 0.56% Fe2O3.The coarser fraction (>150μm) containing 1.06% Fe2O3 achieved a lower iron removal, reaching a
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Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid
Jun 24, 2016 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 [6–10]. Early works, phosphoric acid was reported as leaching iron in kaolin clay [11]. Similarly, the influence of phosphoric acid in iron removal.
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Iron removal from a kaolinitic clay by leaching to obtain high
The material below 37 microns was leached with oxalic acid. A study of main variables of the leaching process in different ranges was realized: time (0 to 120 min), temperature (25 to 100 °C) and acid concentration (0.01 to 0.5 M). Crystallographic analysis of the initial sample indies the presence of kaolinite, iron oxides
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Kinetics of Leaching of Iron Oxide in Clay in Oxalic Acid and in
Recent studies have shown that even traces of iron can be removed by acid washing. Both inorganic and organic acids have been used for acid washing. Results of investigations on leaching of iron oxides in clays in oxalic acid solutions dominate the published literature. Chiaraizia and Horwitz studied dissolution of
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Removal of Iron Oxides in Meetiyagoda Kaolin by ResearchGate
Aug 30, 2016 The results depict that the oxalic acid is more effective in leaching iron oxides from Kaolin compared to citric acid for the Kaolin at Meetiyagoda. It was observed that 25% and 14% of Fe in Kaolin filter cakes can be removed by 0.4 M oxalic and 0.5 M citric acid respectively, within a treatment time of 120 mins
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Iron removal from clays by acidtreatment and reversal of the clay's
Iron removal from clays by acidtreatment and reversal of the clay's plasticity Natural clay was refluxed separately under sulphuric, hydrochloric, and oxalic acids of different concentrations at 100º and 200ºC for 2 hours followed by Plasticity index was used to measure plasticity of raw and chemically treated samples.
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Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid
Jun 24, 2016 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 [6–10]. Early works, phosphoric acid was reported as leaching iron in kaolin clay [11]. Similarly, the influence of phosphoric acid in iron removal.
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model for calculating the concentration of dissolved iron relative to
have studied the use of oxalic acid to dissolve iron oxide on a laboratory scale. Iron dissolution was found to reach 90% for a 20% slurry within 60 minutes using. 0.19M oxalic for the finer fraction (<150 µm) containing 0.56% Fe2O3 [14]. The coarser fraction (>150 µm) containing 1.06% Fe2O3 achieved a lower iron removal
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Iron leaching from China clay with oxalic acid: effect of CiteSeerX
low iron containing (0.84% as Fe2O3) kaolin. The use of culture filtrate of an oxalic acid producing A. niger strain for removing iron from a China clay containing only 0.11% iron was also reported (RoyChaudhury and Das, 1990). However, the rate equations derived for lowiron containing China clay may not be appli.
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Iron Leaching of a Mexican Clay of Industrial Interest by Oxalic Acid
Dec 6, 2005 Nevertheless, there are few works in which oxalic acid is used for the whitening of other minerals different from kaolin. The use of organic acids has been one of the most efficient methods for the whitening of kaolin. In this work the method of iron removal by oxalic acid in a clay sample was adopted.
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Comparative Study of Chemical And Biological Methods of
In this work, chemical and biological leaching of iron rich kaolin sample was carried out using sulphuric acid, oxalic acid, cultured and through. Keywords: bioleaching, Kankara kaolin, Aspergillus niger, iron removal, dealumination, acidolysis, economical, ecofriendly, and uses less amount of energy compared to other
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chemical beneficiation techniques Shodhganga
A lot of research works have been reported on the removal of naturally occurring iron C. The alytic effect of metal powders (Al, Fe, and Zn) in oxalic acid solutions a OF IRONSTAINED CHINA CLAY. 4A.1. INTRODUCTION. Sodium dithionite is widely used as a powerful bleaching agent in the purifiion of kaolin.
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Purifiion of feldspar from colored impurities using organic acids
Jan 5, 2017 Fulltext (PDF) In this study oxalic, citric, and glycolic acids were used in order to reduce Fe and Ti (colored impurities) from the slimes (75 µm) feldspar samples using organic acids. The results showed that removal ratios of the colored impurities from the feldspar samples were 67.9% for Fe
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Iron removal from clays by acidtreatment and reversal of the clay's
Iron removal from clays by acidtreatment and reversal of the clay's plasticity Natural clay was refluxed separately under sulphuric, hydrochloric, and oxalic acids of different concentrations at 100º and 200ºC for 2 hours followed by Plasticity index was used to measure plasticity of raw and chemically treated samples.
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Iron leaching from China clay with oxalic acid: effect of CiteSeerX
low iron containing (0.84% as Fe2O3) kaolin. The use of culture filtrate of an oxalic acid producing A. niger strain for removing iron from a China clay containing only 0.11% iron was also reported (RoyChaudhury and Das, 1990). However, the rate equations derived for lowiron containing China clay may not be appli.
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Removal of Iron Oxides in Meetiyagoda Kaolin by ResearchGate
Aug 30, 2016 The results depict that the oxalic acid is more effective in leaching iron oxides from Kaolin compared to citric acid for the Kaolin at Meetiyagoda. It was observed that 25% and 14% of Fe in Kaolin filter cakes can be removed by 0.4 M oxalic and 0.5 M citric acid respectively, within a treatment time of 120 mins
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Removal of Iron From Quartz Ore Using Different Acids: A
Jul 24, 2013 Quartz ores generally consist of ferrous minerals, such as iron oxide, siderite, pyrite, tourmaline, clay, and mica. When the applicability of physical methods is limited for the purifiion of ores, including these types of minerals, chemical methods such as acid leaching are used to obtain high purity quartz
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Iron Leaching of a Mexican Clay of Industrial Interest by Oxalic Acid
Dec 6, 2005 Nevertheless, there are few works in which oxalic acid is used for the whitening of other minerals different from kaolin. The use of organic acids has been one of the most efficient methods for the whitening of kaolin. In this work the method of iron removal by oxalic acid in a clay sample was adopted.
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Leaching of kaolin ironoxides with organic acids Cameselle
Bleaching of kaolin with a high content of iron oxides by means of three organic acids (citric, gluconic and oxalic) was studied. The first two release small quantities of iron oxides from the kaolin, which means they will not be adequate for largescale processes. Oxalic acid is capable of dissolving all the leachable iron in
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Thermodynamic analysis of stability in iron removal from kaolin by
The acids most commonly used in traditional iron removal from kaolin in industrial scale are sulfuric acid and phosphoric [14]. Other authors reported experimental studies on iron removal which employs organic acids as oxalic acid and ascorbic [5, 6]. However it is considered that the oxalic acid presents a greater potential
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Purifiion of Feldspar from Colored Impurities Using Organic Acids
Jun 15, 2016 Abstract: In this study oxalic, citric, and glycolic acids were used in order to reduce Fe and Ti (colored removal ratios of the colored impurities from the feldspar samples were 67.9% for Fe and 43.75% for Ti .. BONNEY C.F., 1994, Removal of iron from kaolin and quartz: Dissolution with organic acids,.
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Bleaching of a Nigerian kaolin by oxalic acid leaching
Jul 5, 2015 The level of improvement of whiteness of Egbeda (Nigeria) kaolin ore by oxalic acid leaching was investigated. Finally, oxalic acid proved to be effective for treating the Egbeda (Nigeria) kaolin ore for total iron impurities removal and improving the ore whiteness for State, Nigeria was used for this study.
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Refinement of industrial kaolin by microbial removal of ironbearing
In particular, the organic acids produced by the filamentous fungus A. niger (principally oxalic but also citric and gluconic acids) resulted in an increase in whiteness of another kaolin from 56.5% to 80% in 40 h (Camselle et al., 2003). Several technological problems were however identified, such as the use of two separate
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Removal of Fe from kaolin by chemical leaching and bioleaching
Mar 28, 2016 The purpose of the present study was to compare kaolin products obtained by currently used chemical leaching methods with a bioleaching treatment using Aspergillus niger in order to remove Fe from kaolin (from Canakkale, Turkey). The effects of pulp density, temperature, and oxalic acid concentration
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THE REMOVAL OF FREE IRON OXIDE FROM CLAYS*
moving free iron oxide t from soil clays were the acid ammonium oxalate and the aluminiumammonium tartrate methods (Tamm,. 1922 Dion, 1944). Since both had disadvantages, especially when determining the iron by sodium salicylate (Scott, 1941), the use of sodium hydrosuiphite, Na~S204, (Galabutskaya and
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BLEACHING OF A NIGERIAN KAOLIN BY OXALIC ACID LEACHING.
Title: BLEACHING OF A NIGERIAN KAOLIN BY OXALIC ACID LEACHING. iron impurities removal kaolin ore leaching. Nigeria oxalic acid. Abstract: The level of improvement of whiteness of Egbeda (Nigeria) kaolin ore by oxalic acid leaching was However, users may print, download, or email articles for individual use.
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the release of ironbearing minerals and CeramicsSilikaty
formed into kaolinite and/or gibbsite, and iron oxides. [1]. Hydrolysis is the process on Moreover, the bacterial pretreatment facilitated the access of oxalic acid to Febearing minerals and showed a pos sibility to use the oxalic acid in is a standard method used, removing substantial quanti ties of iron and titanium as
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Characterisation and optimisation of deferration of ARPN Journals
99% deferration were temperature of 75°C, oxalic acid concentration of 1.8mol/dm3 and shearing time of 7hrs. The use of magnetic separator, showed no improvement on iron removal from the clay. Keywords: kankara, kaolinite, clay, characterization, optimization, deferration. INTRODUCTION. Clays have received
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kinetics study of iron leaching from kaolinitic clay using oxalic acid
results shown above, iron removal is possible, and this can improve the economic value for this kind of kaolin clay, being possible its use in the ceramic and paper industries as raw material of high quality. Keywords: Iron leaching, Kaolin clay, Kinetics study, Chemical control. Introduction. The red to yellow pigmentation
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Removal of iron from kaolin and quartz: dissolution with organic acids
Mineral acids can be used to remove the iron but these are expensive, not always effective and produce effluents which require treatment for the removal of the iron. The best results for both quartz and kaolin have been achieved with a mixture of citric and oxalic acids and at a ratio of 2: 1 and temperature of 90°C, the iron
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Refinement of industrial kaolin by microbial removal of ironbearing
In particular, the organic acids produced by the filamentous fungus A. niger (principally oxalic but also citric and gluconic acids) resulted in an increase in whiteness of another kaolin from 56.5% to 80% in 40 h (Camselle et al., 2003). Several technological problems were however identified, such as the use of two separate
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Removal of iron from kaolin and quartz: dissolution with organic acids
Mineral acids can be used to remove the iron but these are expensive, not always effective and produce effluents which require treatment for the removal of the iron. The best results for both quartz and kaolin have been achieved with a mixture of citric and oxalic acids and at a ratio of 2: 1 and temperature of 90°C, the iron
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Iron removal from a kaolinitic clay by leaching to obtain high
The material below 37 microns was leached with oxalic acid. A study of main variables of the leaching process in different ranges was realized: time (0 to 120 min), temperature (25 to 100 °C) and acid concentration (0.01 to 0.5 M). Crystallographic analysis of the initial sample indies the presence of kaolinite, iron oxides
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Thermodynamic analysis of stability in iron removal from kaolin by
The acids most commonly used in traditional iron removal from kaolin in industrial scale are sulfuric acid and phosphoric [14]. Other authors reported experimental studies on iron removal which employs organic acids as oxalic acid and ascorbic [5, 6]. However it is considered that the oxalic acid presents a greater potential
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