Extraction of alumina from kaolin by a combination of pyro- and hydro-metallurgical processes

ElDeeb, A.B.; Brichkin, V. N.; Kurtenkov, R. V.; Bormotov, I.S.

doi:10.1016/j.clay.2019.03.008

Cited by 50 publications

(44 citation statements)

References 41 publications

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“…For example, a method of alumina production based on hydrochloric acid processing of kaolin clays was developed and physico-chemical properties of alumina obtained by the hydrochloric acid technology were investigated [11]. The extraction of alumina from the kaolin was also obtained through the leaching process, using aqueous solutions of sodium carbonate as a leaching agent [12].…”

Section: Introductionmentioning

confidence: 99%

The Investigation of Organic Binder Effect on Morphological Structure of Ceramic Membrane Support

Boussemghoune

Chikhi²,

Özay

et al. 2020

Symmetry

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In this study, we investigated the effect of different organic binders on the morphologic structure of ceramic membrane support. Natural raw clay material (kaolin) was used as the main mineral for ceramic membrane support. The physical and chemical properties of kaolin powder and the supports were identified by X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), thermo gravimetric analysis (TGA), scanning electron microscopy (SEM), particle size and zeta potential distribution. Based on the XRF test, the main composition of kaolin powder was SiO2 (47.41%) and Al2O3 (38.91%), while the rest were impurities. The FTIR spectra showed the functional groups of Si-O and Al-O. The XRD diffractogram of natural raw clay powder identified kaolinite and nacrite were the main mineral phase whereas muscovite and quartz were detected in small quantities in the sample. After prepared the ceramic membrane supports, XRD diffractogram showed that anorthite and gehlenite were detected as the main mineral phases for ethylene glycol (EG), gelatin, methocel and for polyethylene glycol (PEG), respectively. According to BET analyses, the maximum and the minimum pore width were obtained for PEG and gelatin organic binders.

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Section: Introductionmentioning

confidence: 99%

The Investigation of Organic Binder Effect on Morphological Structure of Ceramic Membrane Support

Boussemghoune

Chikhi²,

Özay

et al. 2020

Symmetry

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“…The thermal stability of the kaolin powder is a positive aspect for the membrane production. The DTA curve showed that kaolin decomposition occurred at a temperature of approximately 200°C due to the loss of physisorbed water, followed by the dehydroxylation of coordinated and structural water at approximately 400°C and the condensation of hydroxyl groups at higher temperatures [29]. Figure 5 presents SEM images of the as-prepared hollow fibres (before sintering), which were produced Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of kaolin hollow fibre membranes for bacteria removal

Magalhães

Ferreira

Bessa

et al. 2020

PAC

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This study examines the influence of the particle size, extrusion rate and sintering temperature on the characteristics of kaolin hollow fibre membranes. In addition, the produced membranes were applied for bacteria removal from an aqueous suspension. The milling process reduced the size of kaolin particles from 8.7 to 5.1 ?m and greatly enhanced the morphology and mechanical resistance of the produced membranes. The increase in the sintering temperature up to 1250?C caused crystallographic phase modifications in the crude kaolin, which were mainly assigned to transformations of quartz and kaolinite to mullite and cristobalite phases. The fibres sintered at 1250?C have bending strength of 145MPa, but this relatively high sintering temperature caused a substantial particle densification and drastic decrease of the membrane water permeability. The kaolin hollow fibre membranes enabled almost total removal of the Enterobacter bacteria from an aqueous suspension.

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“…The issue of environmental protection is becoming global with active human intervention in natural resources. Two equally important problems should be highlighted: first, protection from depletion as well as reproduction of natural resources and, second, protection from pollution of the environment due to production processes associated with the extraction, transport, storage, and processing of raw materials as well as with the formation of harmful waste [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

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The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

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Extraction of alumina from kaolin by a combination of pyro- and hydro-metallurgical processes

Cited by 50 publications

References 41 publications

The Investigation of Organic Binder Effect on Morphological Structure of Ceramic Membrane Support

The Investigation of Organic Binder Effect on Morphological Structure of Ceramic Membrane Support

Fabrication of kaolin hollow fibre membranes for bacteria removal

Supersulfated Cement Applied to Produce Lightweight Concrete

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