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 …
WhatsApp: +86 18221755073The purification aims to remove colored impurities (iron, titanium, etc.) and sandy minerals (quartz, feldspar, etc.). For kaolin with high whiteness, few impurities and sandy …
WhatsApp: +86 18221755073In this study, Kaolin clay, a mining material, was used as an abundant and available mineral as zero-valent iron-kaolinite composites for As 2 O 3 removal from the water samples. The composites were made by the sodium borohydrate reduction method.
WhatsApp: +86 18221755073The use of chlorination for iron and titanium removal from different clay and kaolin minerals, used in Argentinian ceramic industry, has been investigated to establish reaction mechanisms ...
WhatsApp: +86 18221755073This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the …
WhatsApp: +86 18221755073For instance, a study using a high dose of Linthipe kaolin (80 g/L) achieved a maximum removal capacity of 69.7% (approximately 0.8 mg/g) for phosphate from aqueous solutions (Kamiyango et al., 2009). Another research demonstrated that 2 g of kaolin clay had a removal capacity of 45.6% (around 0.46 mg/g) for phosphate (Al-Zboon, 2018).
WhatsApp: +86 18221755073There are many methods for removing iron from kaolin, which are mainly divided into physical method, chemical method and microbial method. Physical methods mainly …
WhatsApp: +86 18221755073Hosseini, M.R. Pazouki, M. Ranjbar, M. and Habibian, M., 2007 Bioleaching of iron from highly contaminated Kaolin clay by Aspergillus niger Applied Clay Science 37 251 ... Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological (Bacillus Strain) Leaching. Clays and Clay Minerals, Vol. 70, Issue. 3, p. 386.
WhatsApp: +86 18221755073Kaolin, as an important industrial raw material, its purity is directly related to the quality and performance of the product. Therefore, kaolin purification has become a key link. So, what are the methods for kaolin purification? ... How to purify kaolin clay and remove the iron content inside. By Admin .
WhatsApp: +86 18221755073Lu M., Xia G. & Cao W. (2017a) Iron removal from kaolin using thiourea dioxide: Effect of ball grinding and mechanism analysis. Applied Clay Science, 143, 354-361. Lu M., Xia G. & Zhang X. (2017b) Refinement of industrial kaolin by removal of iron-bearing impurities using thiourea dioxide under mechanical activation.
WhatsApp: +86 18221755073Toro et al. (1992) described a microbial method to remove iron impurities from kaolin ore using different bacteria including Agrobacter sp., Bacillus sp., Enterobacter sp., …
WhatsApp: +86 18221755073Accordingly, 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.The oxidized form of iron (ferric iron, Fe(III)) is generally insoluble, but its reduced form (ferrous iron, Fe(II)) is soluble (Nealson and Saffarini, …
WhatsApp: +86 18221755073In the previous studies (Hosseini et al., 2007, Aghaie et al., 2009), firstly, bioleaching of iron from a highly contaminated kaolin sample using two different strains of A. niger was carried out on laboratory scale and the effects of strain type, pulp density and time of clay addition on the iron removal were investigated by employing a 2 3 ...
WhatsApp: +86 18221755073Using A. niger isolated from pistachio shell in the first four experiments, the percentage of iron removal reached to 42.8% after 30 days in the best condition (run 1), where the density of pulp was 20 g/l, and clay was added in the beginning of the cultivation; also, iron concentration in the cultured media reached to 660.24 ppm, and the sugar concentration …
WhatsApp: +86 18221755073In 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 ...
WhatsApp: +86 18221755073Iron removal from kaolin. Comparison between "in situ" and "two-stage" bioleaching processes. Hydrometallurgy, 68 (2003), pp. 97-105. ... Bioleaching of iron from highly contaminated kaolin clay by Aspergillus niger. Appl. Clay Sci., 37 (2007), pp. 251-257. View PDF View article View in Scopus Google Scholar.
WhatsApp: +86 18221755073Centrifugal concentrators can effectively remove high-density impurities, and hydrocyclones can achieve the purpose of washing and grading. Mills can grind kaolin to the required fineness to further improve purity.
WhatsApp: +86 18221755073Due to the diversity of iron-containing components in kaolin and the limitations of current technology and equipment, the quality of kaolin by iron removal by magnetic separation is not ideal and cannot meet all the needs. The iron removal method needs further development. 4. Coagulation, flocculation
WhatsApp: +86 18221755073KEYWORDS Kaolin clay; dithionite; titanium and iron impurities; chemical leaching; brightness The iron removal processes can be categorized as physical, chemical or a combination of both such as sieving, magnetic separation [8,9], EDTA [10], selective flocculation [11], carbohydrates [12], leaching with various chemicals like oxalic acid and ...
WhatsApp: +86 18221755073Magnetic separators remove iron from kaolin. Enhances the purity and quality of kaolin. Improves the brightness of the final product. Essential for high-quality kaolin production. ... The use of kaolin clay spans ceramics, paper, and cosmetics, enhancing product quality and performance. Excellent raw materials are necessary to produce a ...
WhatsApp: +86 18221755073In this work, a series of experiments were carried out to determine the use of mechanically activated TD in the iron removal process from kaolin. The results show that, when rotation speed = 400 rpm, activation time = 1.5 h, TD dosage = 0.8% of kaolin mass, solid-to-liquid ratio = 1:2, pH = 8.0, TD is added with one time, kaolin bleaching ...
WhatsApp: +86 18221755073Elimination 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 surface methodology to optimize the reaction conditions. Time was found to be the most influential variable, although oxalic acid must be present to leach 32% of the ...
WhatsApp: +86 18221755073Hosseini et al. (2007) investigated the effects of strain type, pulp density, and time of clay addition on the iron removal from a Fe-rich kaolin by employing a 2 3 full factorial design. Generally, kinetic models are experimentally derived and fit the cultivation data reasonably well ( Kiviharju et al., 2007 ).
WhatsApp: +86 18221755073XRF analysis of Kaolin. Treated Kaolin samples at the optimum leaching points from the selected acid concentrations in this study (i.e. 0.4 M oxalic and 0.5 M citric acids at 2 hour treatment period) were analysed along with an untreated filter cake sample by using XRF method to identify the Fe removal efficiency of the chemical leaching process.
WhatsApp: +86 18221755073In this work bioleaching of iron from a highly contaminated kaolin sample was carried out using two different strains of Aspergillus niger, and the effects of strain type, pulp density, and time of clay addition on the iron removal were investigated by employing a 2 3 full factorial design. Finally, it is concluded that strain type has the most ...
WhatsApp: +86 18221755073In 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. ... Hosseini, …
WhatsApp: +86 18221755073In 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. ...
WhatsApp: +86 18221755073The 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.
WhatsApp: +86 18221755073Abstract. Recently, microbial-based iron reduction has been considered as a viable alternative to typical chemical-based treatments. 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.
WhatsApp: +86 18221755073Iron 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 SO 3, Cl 2, HCl, and dithionite, etc.However, the whitening efficiency of these traditional methods is usually low due to the complex form of iron (Cao et al. 2016).The reductive leaching of iron from kaolin …
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