Characterization, beneficiation and utilization of a kaolinite clay from Assam, India

Saikia, Nabajyoti

doi:10.1016/s0169-1317(03)00151-0

Cited by 136 publications

(59 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results found in this study are in good accordance with another study [2], where the high efficiency of iron removal was reported; but unlike our study, this work was carried out in quartz sands, using phosphoric acid.…”

Section: Effect Of the Acid Concentrationsupporting

confidence: 93%

See 1 more Smart Citation

Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

et al. 2016

View full text Add to dashboard Cite

Abstract:Kaolin is important because it has many applications in the paper, paint-coating, functional filler, extender and pigment industries. This material needs to be bleached by iron leaching to be useful for these applications because this element can be the principal cause of its undesirable coloration. In this work, the kinetics of leaching of iron contained in kaolin clays from the community of Agua Blanca Iturbide, Hidalgo, Mexico, was studied. The leaching experiments were carried out using phosphoric acid as the reagent of leaching for the iron dissolution process. Temperature, acid concentration, and particle size were investigated to determine the most important kinetics parameters during iron leaching. It was determined that the rate of iron dissolution increases with increasing of phosphoric acid concentration, the temperature, and decreased particle size of clay. Data obtained showed that iron dissolution from kaolin clay is due to the diffusion of iron through the product layer. The results revealed that the activation energy of the process was 10.18 kJ¨mol´1.

show abstract

Section: Effect Of the Acid Concentrationsupporting

confidence: 93%

“…Its beneficiation by known methods is desirable to make it suitable for use in a white product such as paper, rubbers, paints, etc. [1,2].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Since most raw kaolins are associated with some ironbearing and black-colored materials which limit their usability [20], beneficiation thence remains to be an inevitable process necessary for their characterization, materials synthesis, and other advanced applications related to kaolin group of minerals where kaolinite is amongst. Purification of raw Pugu kaolinite was carried out with wet beneficiation technique by simple size separation using "Classifier. "…”

Section: Methodsmentioning

confidence: 99%

Encapsulated Urea-Kaolinite Nanocomposite for Controlled Release Fertilizer Formulations

Sempeho¹,

Kim²,

Mubofu³

et al. 2015

Journal of Chemistry

View full text Add to dashboard Cite

Urea controlled release fertilizer (CRF) was prepared via kaolinite intercalation followed by gum arabic encapsulation in an attempt to reduce its severe losses associated with dissolution, hydrolysis, and diffusion. Following the beneficiation, the nonkaolinite fraction decreased from 39.58% to 0.36% whereas the kaolinite fraction increased from 60.42% to 99.64%. The X-ray diffractions showed that kaolinite was a major phase with FCC Bravais crystal lattice with particle sizes ranging between 14.6 nm and 92.5 nm. The particle size varied with intercalation ratios with methanol intercalated kaolinite > DMSO-kaolinite > urea-kaolinite (KPDMU). Following intercalation, SEM analysis revealed a change of order from thick compact overlapping euhedral pseudohexagonal platelets to irregular booklets which later transformed to vermiform morphology and dispersed euhedral pseudohexagonal platelets. Besides, dispersed euhedral pseudohexagonal platelets were seen to coexist with blocky-vermicular booklets. In addition, a unique brain-form agglomeration which transformed into roundish particles mart was observed after encapsulation. The nanocomposites decomposed between 48 and 600 ∘ C. Release profiles showed that 100% of urea was released in 97 hours from KPDMU while 87% was released in 150 hours from the encapsulated nanocomposite. The findings established that it is possible to use Pugu kaolinite and gum arabic biopolymer to prepare urea CRF formulations.

show abstract

“…This is also confirmed by the thermal analysis (DSC/TGA, Fig. 3), which shows the mass loss and the endo and exothermic peaks typical of kaolinitic clays [14][15][16][17][18][19][20] containing little adsorbed water ( $ 2.5% mass loss) and organic matter ( $ 2% mass loss). The observed total mass loss ( $ 12%) is in good agreement with the measured LoI ( Table 1).…”

Section: Characterization Of Raw Materialsmentioning

confidence: 56%