Leaching of iron oxides from kaolin: Synergistic effect of …
Chemical beneficiation methods involve the removal of mineral impurities from kaolin clay by organic and inorganic acids such as oxalic acid [9][10][11][12][13][14][15], citric acid 16, 17 ...
Biological beneficiation of kaolin: A review on iron removal
Application of mineral bio-beneficiation to remove iron oxyhydroxides from kaolinite clays has been the center of interest in recent decades, and many research works over the world have been dedicated to study the potential of this approach for upgrading the clay whiteness and refractoriness while preserving the inherent specifications and …
Biological beneficiation of kaolin: A review on iron …
Toro et al. (1992) described a microbial method to remove iron impurities from kaolin ore using different bacteria including Agrobacter sp., Bacillus sp., …
Iron removal from kaolin using thiourea assisted by …
The influences of temperature and thiourea dosage on the iron removal were studied for temperatures of 20 and 90 °C in solutions containing thiourea, in the absence of ultrasound. Fig. 1 shows the result of kaolin bleaching at 20 °C with the dosage range of 0.3–1.2% of thiourea dosage. It can be observed that both the dose of thiourea and …
Biological Beneficiation of Kaolin: A Review on Iron …
Iron oxide existence in kaolin is biologically induced, so it is better to apply a biological process for removing it from clays by exploiting microorganisms (Poorni and Natarajan, 2013).
Iron removal from kaolin using binuclear rare earth …
Iron can be removed by several methods such as physical separation: flotation or magnetic separation, or by leaching with suitable leachants including organic/inorganic acids. For example ...
Iron removal from kaolin using thiourea dioxide: Effect of …
In this method, by discarding up to 20% of the raw material, >54% of the total iron content of the raw kaolin was removed, and the iron content was reduced from 9.75% in the initial sample to <6. ...
Iron removal from kaolin. Comparison between "in …
The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron …
Microbial refinement of kaolin by iron-reducing bacteria
The most pertinent disadvantages are high-capital and operating costs and low-removal efficiency of iron. Accordingly, biological methods using microorganisms, which oxidize or reduce iron, should be considered as new and alternative methods to remove iron impurities from kaolin Ryu et al., 1995, Stucki, 1988, Hints et al., 1977.
Iron Removal from Kaolin Waste Dumps by Chemical …
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
Iron Removal from Kaolin Waste Dumps by Chemical …
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 …
Iron removal from kaolins by bacterial leaching
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 ...
Iron removal from kaolin. Comparison between "in situ" …
Semantic Scholar extracted view of "Iron removal from kaolin. Comparison between "in situ" and "two-stage" bioleaching processes" by C. Cameselle et al. ... 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 ...
4 Major Iron Removal Methods in Kaolin Production Process
2. Double-liquid layer flotation method. This method adopts a no carrier flotation method to remove titanium impurities and other minerals, which can adapt to finer kaolin (less than 2um particles more than 80%) float purification. The above are the four common iron removal methods in kaolin production process.
Evaluation of the Efficiency of Iron Removal in the …
To remove iron compounds from kaolin the following problems must be solved: identification of the iron compounds in clayey materials [ 1 ]; freeing iron …
Purifying Kaolin: Removing Iron Impurities Made …
Methods Of Removal Iron Impurities from Kaolin. In order to minimize the iron content in kaolin and increase its whiteness. Physical beneficiation methods are usually used to enrich kaolin raw materials or …
sbm/sbm methods to remove iron from kaolin.md at main
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Iron removal from kaolin. Comparison between "in situ" …
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 …
Effect of Temperature on Bioleaching of Iron Impurities from Kaolin …
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 ...
Iron removal from kaolin. Comparison between "in situ" …
The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron contained as impurity in kaolin. This allows an increase of kaolin whiteness index, a very important factor for its industrial application. Iron leaching may be carried out "in situ" by …
Biochemical Method of Removing Iron from Zhuravlinyi Log Kaolin
The reasons for the inefficacy of iron removal from Zhuravlinyi Log kaolin by dry grading into fractions method are analyzed. A biochemical kaolin-enrichment technology is proposed.
Iron removal from kaolin using thiourea assisted by …
In this method, by discarding up to 20% of the raw material, >54% of the total iron content of the raw kaolin was removed, and the iron content was reduced from 9.75% in the initial sample to <6. ...
(PDF) Removal of Iron Oxides in Meetiyagoda Kaolin by
In this method, by discarding up to 20% of the raw material, >54% of the total iron content of the raw kaolin was removed, and the iron content was reduced from 9.75% in the initial sample to <6. ...
Optimal removal of iron impurities from kaolin by …
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 ...
methods to remove iron from kaolin
A Simple Method Of Removing Iron From Kaolin. Nov 12, 2019 It contains not less quantitative ferroferric oxide, ferric oxide and iron. Magnetic minerals such as silicates, so kaolin should be subjected to iron removal. According to the difference in the composition and proportion of magnetic minerals, different magnetic separation processes are …
(PDF) Thermodynamic analysis of stability in iron removal from kaolin
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 ...
Kinetic modeling of the bioleaching process of iron removal from kaolin
A kinetic model was developed to assess the influence of batch cultivation of Aspergillus niger on the bioleaching of iron from kaolin. A simple model was proposed using the logistic equation for ...
Iron Removal from Kaolin Waste Dumps by Chemical …
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 …
(PDF) Refinement of industrial kaolin by microbial removal of iron
Conclusions Two series of bacterial iron-reduction experiments have shown that all tested Shewanella sp. bacterial strains were able to leach iron impurities from industrial kaolins and that among the tested strains, S. putrefaciens CIP8040 is the most efficient in terms of both extent of Fe removal and improvement in the colour properties of ...
Adsorptive Removal of Iron and Manganese from
Zeolite Y is able to remove 98% of iron and 97% of manganese within an hour. The adsorption of both iron and manganese followed the Freundlich model, suggesting that the ions