present in the kaolin and 2 iron hydroxide stains on the surface of the particles Generally flotation processes remove Ti02 from the kaolin which improves product brightness Iron content is not much affected by flotation Unlike many flotation processes where the desired component is
Iron leaching from kaolin using various ironreducing bacteria at 20 °C All experiments were run with 20 g of kaolin and 105 ± 035 10 7 CFU mL − 1 of cell suspension The initial rate of reduction was computed from the first derivation of a nonlinear curve fit represented by the dotted lines
In 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
Iron is the main contaminant in minerals of clay and kaolin The removal of the iron from kaolin is of particular importance in the paper industry among others where purity requirements are high In these minerals iron may or may not form part the kaolinite crystalline lattice
In the present study a bleaching process of a kaolinite was carried out using thiourea as the leachant agent in the iron removal process in the absence and presence of ultrasound The effect of
Eighteen purified kaolin samples from Thai Ultisols were studied by Xray diffraction Xray fluorescence transmission electron microscopy and BET methods Minor amounts of inhibited vermiculite quartz and anatase were general contaminants of the kaolins which had an average chemical composition of 403 g kg −1 Al 2 O 3 550 g kg −1 SiO 2
The extent of desorption or removal of metal ions from kaolinite clay by a chelator is therefore highly dependent on the competitive binding or affinity of the metal ion with kaolinite clay or the
DIOXIDE IMPURITIES FROM KAOLIN R N MAYNARD N MILLMAN and J IANNICELLI J M Huber Corporation Clay Division Huber Georgia Received 15 October 1968 AbstractThe removal of titanium minerals from kaolin can be accomplished by treatment with
Bioleaching of Kaolin Using Indigenous Iron Reducing Bacteria 8182 Microbial removal of pyrite from lowgrade clay deposits using sulfur and ironoxidizing bacteria such as A ferrooxidans and A thiooxidans has been demonstrated About 90 of the pyrite could be removed in about 2 weeks at pulp densities as high as 70
In practice 12 lbs of leaching chemical may be used merely to filtration of kaolin clay 67 improve shade of kaolin In any case there would be a saving of leaching reagent ranging from 2 to 7 lb per ton of clay HEMF treatment of kaolin under these conditions costs less than 2 lb of dithionite reagent
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