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 ...

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 ...

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. ...

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 …

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.

Abstract. This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed …

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 was carried out using response …

In some cases, the removal of iron oxides from kaolin is achieved by reducing iron(III) (oxidized and insoluble form) to iron(II) ... The speciation of iron in the samples was carried out analyzing the iron(II) by the colorimetric method of 1,10-phenantroline (Bridgewater et al., Reference Bridgewater 2012; Stucki, ...

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. ...

To remove iron compounds from kaolin the following problems must be solved: identification of the iron compounds in clayey materials [ 1 ]; freeing iron …

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 …

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 ...

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. ...

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 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 …

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 on the chemical leaching …

Accordingly, a pre-agitating technique followed by high-pressure washing of the sample on a 600 μm sieve were applied. 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 <6.00% in the passing fraction.

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.

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 …

At present, the chemical iron removal methods commonly used in kaolin include oxidation method, restoration method and Chineseization-restoration combined method, among which the restoration method is the most widely used. Which method is used in detail depends on the type of iron ore contained in kaolin. (1) Oxidative iron …

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 ...

The greatest degree of removal of Fe from the kaolin sample (at 15% w/v pulp density, temperature of 80 degrees C, oxalic acid concentration of 0.2 M, and a particle size of <63 mu m) was found to ...

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. ...

In more recent studies, Hajihoseini and Fakharpour (2019) showed that 47.7% of iron was reduced from kaolin with 75.41% of whiteness index that was achieved after leached with Aspergillus niger ...

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 …

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. ...

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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 oxide in kaolin can be removed by physical separation, e.g. flotation or magnetic separation, or by chemical leaching processes using chemicals such as Na 2 …

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 ...