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 ...
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 ...
The evolution of iron concentration in the four experiments with strain CBS 246-65 is plotted in Fig. 1.The highest concentration of dissolved iron and leaching rate (4 g Fe/m 3 day) were obtained in experiment 4, where 5 g of kaolin was added to the culture at the beginning. The final concentration of dissolved iron was 49 g/m 3, which represents …
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) …
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 …
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 ...
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 …
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 …
PDF | On Mar 1, 2011, A. Martínez-Luévanos and others published Leaching kinetics of iron from low grade kaolin by oxalic acid solutions | Find, read and cite all the research you need on ...
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
iron(III) forms present in kaolin as final electron accep-tors, reducing them to iron(II) (Kostka et al., 1999;Luu &Ramsay,2003). The current study investigated chemical leaching of iron from kaolin using citric and oxalic acids, and the microbial removal of Fe(III) present in kaolin, using pure cultures of a bacterial strain. The experimental
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 …
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.
The kaolin coagulation or flocculation method mainly removes iron and titanium impurities in kaolin. The pulp concentration must be lower than 20%, so a large amount of water needs to be released in …
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 …
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 ...
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 ...
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 …
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 ...
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.
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 ...
The purpose of this review was to depict an overview of the status of biological removal of iron from clays, evaluate and compare the results, and to …
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 ...
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
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 …
Iron as the main contaminating element in kaolin gives an undesirable reddish color to this white clay, therefore analyzing the modes of occurrence of Fe in kaolin has important guidance for their ...
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.
The level of improvement of whiteness of Egbeda (Nigeria) kaolin ore by oxalic acid leaching was investigated. The effects of acid concentration, reaction temperature and particle size on the extent of the ore dissolution were examined.
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
The decrease in the iron content in the TD bleached samples can be ascribed to the leaching of the Fe 3 + ions from the kaolin (Eqs. (1), (2), (3)). The removal efficiency of iron is highest in Al 3 +-assisted bleaching processes, with 43.3% (sample D 1) and 30.7% (sample D 2) of removal in Beihai and Xingzi kaolin, respectively.
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 a yellowish color to the kaolin. Elimination of iron from kaolin using either a chemical or a biological method was the aim of this study. The chemical leaching of iron from kaolin …
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 …
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 …
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 ...
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 ...
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 …
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 …
