Effects of calcium hydroxide and calcium chloride addition to bentonite in                 iron ore pelletization

Tuğrul, Nurcan; Derun, Emek Möröydor; Pişkin, Mehmet Burçin

doi:10.1177/0734242x06066119

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…Existence of Ca (55.54% w/w), Si, Al, Mg, Na, Fe and O was observed by elemental analysis (see supplementary table S1 of the Supporting Information). High calcium content in the original and modified BT-PEG sorbent indicates effective sorption capability [30]. After modification, a slight increase in carbon and oxygen content and decrease in calcium content can be seen, which confirm the successful synthesis of BT-PEG.…”

Section: Characterization Of the Sorbentmentioning

confidence: 66%

Bentonite polymer composite for water purification

et al. 2019

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A polyethylene glycol (PEG)-bentonite (BT) composite was prepared by direct polymerization of PEG in suspensions of BT. Based on detailed analyses using field-effect scanning electron microscopy, X-ray diffraction, surface area measurements and chemical methods, the obtained product was mainly composed of Ca-BT with a specific surface area of 4.13 m 2 g −1. The optimal conditions for adsorption of Pb 2+ and Cd 2+ ions were found to be a PEG content of 0.1% and a contact time of 60 min. The sorption experiments were performed under various operating variables, including polymer concentration, pH and temperature. For both Pb 2+ and Cd 2+ , the adsorption equilibrium was described by the Freundlich model, which confirmed the presence of a heterogeneous system with irregular filling of the active centres. The maximum sorption capacities of BT-PEG for removal of Pb 2+ and Cd 2+ were found to be 22 and 18 mg g −1 , respectively. The rate constants calculated for the sorption of Pb 2+ and Cd 2+ were 6.29 and 6.67 g mg −1 min −1 , respectively, at 25 • C. This study shows that the obtained sorbents based on BT may be used for treatment of waste water and could help resolve environmental protection issues.

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Section: Characterization Of the Sorbentmentioning

confidence: 66%

Bentonite polymer composite for water purification

et al. 2019

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“…Annually, a large amount of sulfuric acid (more than hundred million tons) is produced worldwide (Tveit 2003), and in Serbia almost 500,000 tons. Pyrite cinders are mainly composed of iron oxides in the form of hematite and magnetite, and also contain traces of toxic/hazardous heavy metals such as Cu, Zn, Pb, and As (Álvarez-Valero, Sáez, Pérez-López, Delgado, & Nieto 2009;Vinals, Balart, & Roca 2002), which limit their usage in pig iron industry (Tugrul, Derun, & Piskin 2006;. Furthermore, pyrite cinders are characterized by their fine size and can often lead to problems with dust in the surrounding area of the surface disposal site.…”

Section: Introductionmentioning

confidence: 99%

Assessing the possibility of solidification and stabilization of pyrite cinder by using quicklime and fly ash

Kerkez¹,

Pilipović²,

Bečelić‐Tomin³

et al. 2020

JEPM

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The aim of this study was to determine the possibility of using two low-cost binders,quicklime and fly ash for the solidification/stabilization (S/S) of pyrite cinder.Pyrite cinder, used in this study, represents a remnant from sulfuric acid productionin fertilizer factory IHP “Prahovo” A.D. (Serbia), and has a very high toxicmetal content. High contents and leachability of copper, lead and zinc make thiswaste material hazardous, representing an extraordinary risk to the environment.In order to determine the leaching behavior of the S/S mixtures, four single-stepleaching tests were performed, each one having a different sort of leaching fluid(deionized water, inorganic and organic acidic solutions). X-ray diffraction (XRD),scanning electron microscope (SEM) and energy dispersive X-ray analyzer (EDS)were implemented to elucidate the mechanisms responsible for immobilization ofCu, Pb and Zn. Overall, the test results indicated that S/S treatment using bothquicklime and fly ash was effective in immobilizing these metals, especially whenthere is a higher share of binder present. Treated waste can be safe for disposal andeven considered for “controlled utilization”. Furthermore, the use of fly ash for S/Streatment of pyrite cinder solves the disposal problems of two waste types, as it alsorepresents a secondary industrial product.

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“…After the utilization of this waste material in a heterogeneous Fenton process, generated sludge is mainly composed of the used pyrite cinder. As pyrite cinder also contains traces of toxic/hazardous heavy metals such as Cu, Zn, Pb, and As [4][5][6], generated sludge may be toxic and cannot be disposed of directly without previous treatment.…”

Section: Introductionmentioning

confidence: 99%

Treatment of pyrite cinder sludge after usage in dye degradation: Feasibility study

Kerkez¹,

Bečelić‐Tomin²,

Dalmacija³

et al. 2016

Zas Mat

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Over the last couple of years greener concept in hazardous waste management is gaining increasing relevance. This term refers to the processes and activities that have little or negligible impact on the environment. The aim of this study is to systematically quantify the physical and chemical properties of the solidified/stabilized (S/S) sludge generated in dye effluent treatment, when pyrite cinder is used as catalytic iron source in the modified heterogeneous Fenton process. S/S treatment was performed by using two clay materials (kaolinite and bentonite) and lime in order to immobilize Cu, Pb and Zn present in the sludge. Microwave assisted sequential extraction procedure was employed to assess potential metal mobility and risk to the environment. In order to determine the long-term behaviour of the S/S mixtures, the semi-dynamic ANS 16.1 leaching test was performed. S/S effectiveness was evaluated by measuring the cumulative fractions of leached metals, effective diffusion coefficients -De and leachability indices -LX. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were implemented to elucidate the mechanisms responsible for immobilization of the

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Effects of calcium hydroxide and calcium chloride addition to bentonite in iron ore pelletization

Cited by 14 publications

References 7 publications

Bentonite polymer composite for water purification

Bentonite polymer composite for water purification

Assessing the possibility of solidification and stabilization of pyrite cinder by using quicklime and fly ash

Treatment of pyrite cinder sludge after usage in dye degradation: Feasibility study

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