Title
Mechano-chemical and thermal treatment of iron bearing waste materials
Creator
Issa, Hatim Abdalla Sasi.
Copyright date
2016
Object Links
Select license
Autorstvo-Nekomercijalno 3.0 Srbija (CC BY-NC 3.0)
License description
Dozvoljavate umnožavanje, distribuciju i javno saopštavanje dela, i prerade, ako se navede ime autora na način odredjen od strane autora ili davaoca licence. Ova licenca ne dozvoljava komercijalnu upotrebu dela. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc/3.0/rs/deed.sr_LATN Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc/3.0/rs/legalcode.sr-Latn
Language
English
Cobiss-ID
Committee report
Theses Type
Doktorska disertacija
description
Datum odbrane: 20160928
Other responsibilities
mentor
Kamberović, Željko, 1968-
član komisije
Korać, Marija.
član komisije
Gavrilovski, Milorad.
član komisije
Anđić, Zoran.
član komisije
Popović, Miljana, 1965-
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Beogradu
Faculty
Tehnološko-metalurški fakultet
Alternative title
Publisher
[H. A. S. Issa]
Format
177 listova
description
Metallurgy
Abstract (en)
Steel scrap recycling is generally performed by direct smelting of scrap in
electric arc furnaces, generating about 2% of dust per charge. Electric arc furnace
dust (EAFD) is characterized as a hazardous material, due to its heavy metals
content and a powder form.
This PhD thesis presents the study of Serbian electric arc furnace dust
(EAFD) management trough some conventional and innovative technologies.
The investigated EAFD was brought from Serbian carbon steel making and
that is way the zinc percentage it was 30.34%, which is in the standard range of
typical chemical analysis of EAFD from carbon steelmaking. The analysis also
shows that zinc, iron and chromium are mainly present as ferrites which are very
resistant against to any kind of treatment. Because of that, it is necessary to use
more aggressive conditions (high temperature or stronger leaching reagent) for
metals recovery.
Solidification/Stabilization (S/S), a widely used treatment technology, of
EAFD was investigated in two ways; first as cement replacement in grout mixture
and the replacement percent was set up to 80%. Results of compressive strength
testing showed that the best maximum replacement of cement with EAFD is 20%.
With a higher amount of EAFD in mixture compressive strength decreases rapidly.
According to leachability results, Pb was stabilized in a cement matrix even at 80%
of cement replacement with EAFD.
Second way of (S/S) of EAFD by using cement as the main stabilizer, fly ash
as an additive, and controlling the EAFD particle size by milling. EAFD replaced
50 % of fine aggregate and fly ash replaced 10-25% of cement in mixtures, with
different milling times applied. S/S samples were tested for compressive strength
and heavy metals leachability. The results of compressive strength testing showed
that the best maximum EAFD replacement is 15%, after which compressive
strength decreases rapidly. The best fly ash compressive strength was attained at
10% replacement of both fine aggregate and cement. The milled EAFD produced
the best results at three hours of milling; however, the addition of fly ash resulted in a slight compressive strength decrease in these samples. Leachability results of concrete samples indicated that Zn and Pb were stabilized in the cement matrix even at 30% of fine aggregate replacement with EAFD...
Authors Key words
EAFD, Solidification/Stabilization, Metallurgical properties,
Zinc, Lead, Process modeling, Concrete, Fly ash, LCD glass, Sintering, Ceramic
materials, Thermal treatment
Classification
669.1:544.463(043.3)
Type
Tekst
Abstract (en)
Steel scrap recycling is generally performed by direct smelting of scrap in
electric arc furnaces, generating about 2% of dust per charge. Electric arc furnace
dust (EAFD) is characterized as a hazardous material, due to its heavy metals
content and a powder form.
This PhD thesis presents the study of Serbian electric arc furnace dust
(EAFD) management trough some conventional and innovative technologies.
The investigated EAFD was brought from Serbian carbon steel making and
that is way the zinc percentage it was 30.34%, which is in the standard range of
typical chemical analysis of EAFD from carbon steelmaking. The analysis also
shows that zinc, iron and chromium are mainly present as ferrites which are very
resistant against to any kind of treatment. Because of that, it is necessary to use
more aggressive conditions (high temperature or stronger leaching reagent) for
metals recovery.
Solidification/Stabilization (S/S), a widely used treatment technology, of
EAFD was investigated in two ways; first as cement replacement in grout mixture
and the replacement percent was set up to 80%. Results of compressive strength
testing showed that the best maximum replacement of cement with EAFD is 20%.
With a higher amount of EAFD in mixture compressive strength decreases rapidly.
According to leachability results, Pb was stabilized in a cement matrix even at 80%
of cement replacement with EAFD.
Second way of (S/S) of EAFD by using cement as the main stabilizer, fly ash
as an additive, and controlling the EAFD particle size by milling. EAFD replaced
50 % of fine aggregate and fly ash replaced 10-25% of cement in mixtures, with
different milling times applied. S/S samples were tested for compressive strength
and heavy metals leachability. The results of compressive strength testing showed
that the best maximum EAFD replacement is 15%, after which compressive
strength decreases rapidly. The best fly ash compressive strength was attained at
10% replacement of both fine aggregate and cement. The milled EAFD produced
the best results at three hours of milling; however, the addition of fly ash resulted in a slight compressive strength decrease in these samples. Leachability results of concrete samples indicated that Zn and Pb were stabilized in the cement matrix even at 30% of fine aggregate replacement with EAFD...
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