Leaching kinetics of iron from low grade kaolin by oxalic acid solutions. ... The low grade kaolin sample was supplied by a refractory company (Zacatecas, Mexico), and it was previously milled in the company; this low grade kaolin is used by this refractory as raw material in the production of ceramic articles. ... that employing 2 M HCl along ...
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Removal of iron from kaolin and quartz 315 the kaolin mycelium as iron hydroxide. It was also seen that there was an increase in the F~03 content with decrease in particle size; e.g. -10+5 I'm particles contained ± 1 % F~03 whereas -0.125 I'm particles contained ±5 % F~03. 2.2.2 Quartz The quartz sample consisted mainly of a-quartz and feldspar, …
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modified to increase its adsorption ability to remove heavy metals from raw water. The removal efficiency of the natural sub - micro - kaolin powder and its acid (sulfuric & acetic acids) modified forms were investigated for the removal of iron and manganese from raw water samples collected from the northern part of Beni-Suef governorate
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The removal of Cr(VI) from the kaolin can be broadly categorized into three distinct processes: (1)The desorption of Cr(VI) from kaolin colloidal particles into the pore water. (2)The electromigration of a portion of Cr(VI) to the anode, facilitated by the direct current (DC) electric field, allows for its migration through the soil matrix.
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The iron reduction is an important process in kaolin refining, where iron-bearing impurities in kaolin clay affects the whiteness, refractory properties, and its commercial value. In recent years, Gram-negative bacteria has been in the center stage of iron reduction research, whereas little is known about the potential use of Gram-positive ...
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The prolonged bioleaching time showed the removal of 53 % bound Fe from kaolin (KS3 sample), which was taken from Vyšný Petrovec. The biodegradation of iron oxyhydroxides and a partial ...
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In some cases, the removal of iron oxides from kaolin is achieved by reducing iron(III) (oxidized and insoluble form) to iron(II) (reduced and soluble form) by the effect of …
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the anatase present in the kaolin deposits has an intense reddish-brown color. This color is likely due to substitution of 2 to 5% iron (expressed as % Fe2O3) for titanium in the crystal lattice of the anatase. As the anatase is removed from the kaolin, substantial brightness improvement of the remaining kaolin is obtained.
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The iron was combined with kaolin by calcination. The test liquid contained sewage slu … Nanoscale particles of zero-valent iron were used to form a permeable reactive barrier whose performance in dechlorinating a solution of trichloroethylene was compared with that of a barrier formed from limestone.
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Research paper Refinement of industrial kaolin by microbial removal of iron-bearing impurities Asfaw Zegeye ⁎, Sani Yahaya, Claire I. Fialips, Maggie L. White, Neil D. Gray, David A.C. Manning School of Civil Engineering and Geosciences, Drummond Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
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DOI: 10.1002/slct.201903813 Corpus ID: 213569995; Environmentally Friendly Treatment of Coal‐Bearing Kaolin by Polyhydroxy‐Iron for Anionic Dye Removal @inproceedings{Muschin2019EnvironmentallyFT, title={Environmentally Friendly Treatment of Coal‐Bearing Kaolin by Polyhydroxy‐Iron for Anionic Dye Removal}, author={Tegshi …
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Thus, iron removal by acids should be conducted prior to calcination. Keywords: kaolin; iron removal; calcination; acid leaching; extraction; Möss spectroscopy 1. Introduction Coal kaolin, coal gangue dominated by kaolin, is widely deposited in China, and it is estimated that the amount up to
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The beneficiation of kaolin, by iron removal, improves its economic value, and it is then possible to use it in the ceramic and paper industries. The effect of thiourea was investigated together ...
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The graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant. To do this the free energies of formation of the oxalate complex of the system were calculated, and it was found that the more stable specie is …
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Flotation tests were undertaken on both pure kaolin and quartz. All flotation tests were conducted in a 1.5 L mechanical laboratory flotation machine operating with an air flowrate of 4.5 L/min.The mass of solid particles used in each test was 30 g for both kaolin and quartz.These flotation tests were conducted in accordance with the flowsheet …
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Statistical Treatment of Bleaching Kaolin by Iron Removal 261 Statistical Treatment of Bleaching Kaolin by Iron Removal Román Ángel Hernández Hernández,*1 Felipe Legorreta García,1 Leticia Esperanza Hernández Cruz,1 and Antonia Martínez Luévanos2 1 Universidad Autónoma del Estado de Hidalgo. Área Académica de Ciencias de la …
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In the present study, to investigate the effects of acidic leaching on the iron removal from kaolin clay supplied by Cam-Ser Madencilik A.S., the 24 full factorial design of experiments and ...
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Dry separation of iron mineral from low-grade coal-series kaolin in Hubei Province of China was investigated. The structure and chemical composition of the kaolin ore were determined by X-ray diffraction (XRD) and X-ray Fluorescence (XRF) analyses. The narrow particle size range classification, dry magnetic separation and calcination …
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for iron content, as well as to conduct color measurements. The results of the kaolin powder XRF showed 52% iron removal from kaolin by A. niger fungal isolated from pistachio skin after 14 days and 47.7% iron removal after 28 days at a temperature of 25°C and 33.8% iron removal after 28 days at a temperature of 30°C.
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The results of the kaolin powder XRF showed 52% iron removal from kaolin by A. niger fungal isolated from pistachio skin after 14 days and 47.7% iron removal after 28 days at a temperature of 25 ...
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1. Introduction. As an important industrial additive, kaolin is widely used in many industrial fields such as paper filling and coating, refractories and ceramic, fiberglass, cement, rubber and plastic, and paint (Murray 2002).The whiteness is one of the most important factors in determining the application and economic value of kaolin.
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Similarly, the influence of phosphoric acid in iron removal from quartz sand bleaching was also studied [12]. Also, statistical analysis was conducted to determine the most influential factors in ...
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Iron impurities in the kaolin were reduced from 0.88% to 0.48% with an increase in the natural whiteness index from 60.8% to 81.5% after 7 days of bioleaching treatment. A granulometric analysis of dispersed kaolin demonstrated that the bioleaching resulted in a decrease in particle size.
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The kaolin sample used in this study was provided by Yankuang Beihai Kaolin Co., Ltd. (Hepu County, Guangxi Province, PR China). The kaolin slurry was passed through a 250-mesh sieve to collect the < 63 μm fraction. The final kaolin slurry had a mineral content of around 250 g/L. All chemicals used were of guaranteed-reagents …
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In a shake flask, bioleaching of kaolin by Aspergillus niger resulted in removal of 77.13% of the total Fe, suggesting that this strain is effective at removing Fe impurities from kaolin. The removal efficiency generally decreased with increased pulp …
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Fig. 2 shows the residual concentrations of Pb(II) as a function of reaction time for batch serum tubes containing 0.1 g of K-nZVI, and kaolin in the absence of loaded nZVI (shown in the insert figure) and 10 mL of different initial concentrations of 50.0, 250.0, 500.0 and 1000.0 mg L −1 Pb(II). The results demonstrate that the equilibrium for Pb(II) …
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Kaolin is widely used in ceramics, paper making, coatings and other fields. Kaolin generally contains iron, and too high iron content will affect the whiteness of kaolin, thereby affecting the added value of products. The whiteness of high-grade kaolin is required to be more than 92%. How to remove iron from kaolin to a greater extent has …
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The results of the kaolin powder XRF showed 52% iron removal from kaolin by A. niger fungal isolated from pistachio skin after 14 days and 47.7% iron removal after 28 days at a temperature of 25 ...
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Calcination and acid leaching of coal kaolin were studied to determine an effective and economical preparation method of calcined kaolin. Thermogravimetric-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) demonstrated that 900°C was the suitable temperature for the calcination. Leaching tests showed that …
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The use of microorganisms to remove Fe (oxyhydr)oxides from kaolins has the potential to be an effective method for upgrading the whiteness and brightness, and therefore the commercial value, of the kaolin. The purpose of the present study was to compare kaolin products obtained by currently used chemical leaching methods with a …
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Abstract. Kaolin waste dumps contain a huge volume of material that cannot be commercialized due to the presence of variable amounts of iron minerals, which impart …
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This paper reports the study of the removal of impurities and characterization of kaolin clays from different mines in Agua Blanca de Iturbide, Hidalgo (Mexico), treated with the aim of increasing ...
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It was found that the adsorption capacity of kaolin increases with adsorbent dosage and temperature; therefore, the removal of the parameters by kaolin was temperature-dependent. The isotherm and kinetic models for the adsorption of the pollutants from wastewater conform to the Jovanovic and Redlich-Peterson isotherm …
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6 subsequently. The following is a brief history of kaolin bioleaching using different kinds of bacteria and fungi. 3.1. Fungi Fungi which are used in leaching processes must be able to excrete ...
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DOI: 10.1016/J.CLAY.2016.03.002 Corpus ID: 102276479; Iron removal from kaolin using binuclear rare earth complex activated thiourea dioxide @article{Cao2016IronRF, title={Iron removal from kaolin using binuclear rare earth complex activated thiourea dioxide}, author={Wenbing Cao and Guang-hua Xia and Mang Lu and Hangang Huang and Xu …
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The reason for this is that the iron-containing mica crystal was destroyed by sulfoxylate and hydroxide ions attacking. XRF examined the Fe 2 O 3 content of kaolin was decreased from original 1.17 wt% to 0.65 wt% after bleaching (Table 3), which indicates the effective removal of iron from the kaolin powders. Download : Download full-size image ...
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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 …
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