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Interfacial reactions between the electric arc furnace EAF slag CaO SiO 2 FeO MgO Al 2 O 3 MnO system and the magnesia refractory as a function of direct reduced iron DRI addition 0 10 20 30wt% were investigated at 1550°C under an Ar MgO
The EAF slag was found to have superior low % In terms of chemical composition the slag mainly consisted of oxides such as Al2O3 CaO MgO SiO2 FeO and Fe3O4 which are similar
Moreover the new EAF slags will be also different compared to today s scrap based EAF slag However specific slag/metal ratios resulting slag volumes chemical and mineralogical compositions and physical properties of the new slags are yet unknown Thus also their cementitious and environmental properties are still unknown
The results show that for industrial pavement construction concrete with EAF slag aggregates has similar environmental load and cost with the reference concrete while in the case of pervious paving blocks the use of EAF slag aggregates reduces the environmental load by 14% at a reduced cost and for heavyweight concrete the environmental load
Fig 1 Electric circuit used for measuring slag electrical conduc tivity Table 2 Chemical composition of slag sample used for tempera ture study %CaO %SiO 2 %FeO %MgO %Al 2O 3 %MnO 25 Fig 2 Relation between slag electrical conductivity and tempera ture Fig 2 Relation between slag electrical conductivity and
Chemical phase analysis of steel slag indicated that Fe and Cr are mainly about 70 % in the form of oxides while Ni and Mo are in the form of metal9 The chemical composition of the EAF slag samples used in our study is reported in Table 2 The mass fractions of main components of EAF slag were CaO % SiO 2 %
Melting of EAF slag buttons at different temperatures 1050 ºC 1100 ºC 1150 ºC 1200 ºC 1250 ºC 1300 ºC 1350 ºC and 1400ºC Furthermore as the button was fired at 1250 °C it started to fuse partially This was assumed as the furnace cooled EAF slag button was difficult to be removed from crucible
EAF oxidizing slag as a by product obtained during the process in steel making industry provides great opportunity to utilize it as an alternative to normally available coarse aggregates The primary aim of this research was to evaluate the physical mechanical and durability properties of concrete made with EAF oxidizing slag in addition to
The three electrode submerged arc furnace operated by our industrial partner LARCO which was used in the current study is portrayed in Fig 1 a in which the calcine fed using five silos along the furnace periphery is also shown Of particular modeling interest in the EAF are the firebricks and the Söderberg electrodes while the main furnace body is comprised
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The MgO saturation concentration depends on the temperature and slag components The main EAF slag components are CaO SiO 2 FeO and MgO; others are Al 2 O 3 MnO P 2 O 5 and TiO EAFs that use a large proportion of direct reduced iron DRI several of these oxides in particular SiO 2 and Al 2 O 3 originate from gangue in the DRI
Electric arc furnace slag EAF has the potential to be re utilized as an alternative to stone material however only if it remains chemically stable on contact with water The presence of hydraulic phases such as larnite 2CaO SiO2 could cause dangerous elements to be released into the environment Ba V Cr Chemical treatment appears
As can be seen the difference in the means of the fatigue life for unaged mixes containing 50% or higher EAF slag at 800 kPa stress level was significant; that is the difference was due to the addition of EAF slag However for E 100 and E F specimens the difference in the means of the fatigue life was significant at all three stress levels
Cracks on the EAF slag surface contributed to its longer lifespan Analysis with P K edge XANES spectroscopy showed that the P retained on the slag surface was dominated by amorphous calcium phosphate with a substantial amount of carbonate apatite around 30% Amorphous calcium phosphate was transformed to crystalline apatite as the slag aged
EAF slag taken from steel making plant during normal production process was crushed and analysed with XRF to obtain chemical composition result and XRD for phase analysis ICP OES elemental test
EAF technology is used for around 30% of European carbon and low alloy steel production In Spain alone approximately 70% of all steel is produced in electric arc furnaces 10 MT per year of EAF steel representing around 15% of total European EAF steel 67 MT per year [19] [20] The practical use of electric furnaces in steelmaking is
Interfacial reactions between the electric arc furnace EAF slag CaO SiO2 FeO MgO Al2O3 MnO system and the magnesia refractory as a function of direct reduced iron DRI
The Fe phases in the EAF slag matrix come from scrap iron Ca comes from burnt lime Mg comes from the lime and refractory materials The Al in the composition of EAFS forms due to the contamination of steel scraps and Si comes from cast iron generally charged as substitution of iron scraps
The Paling Slag Transport System STS is a high volume molten slag handling system that is revolutionizing slag handling in Electric Arc Furnace EAF steelmaking operations T F
Weibull distribution analysis revealed that the inclusion of fine EAF slag aggregates increases the fracture failure probability compared with those containing coarse aggregates A statistically predictive model was introduced based on the Weibull distribution results to predict the in plane shear Mode II fracture properties using those of Mode I
wassergekühlte Kabel von EAF LF Electric Arc Furnace datenblatt Kontaktbacke für leitfähige Arme des EAF Elektrolichtbogenofens datenblatt Leitfähige Arme für EAF Elektrolichtbogenofen datenblatt 50 Tonnen EAF Elektrolichtbogenofen datenblatt
EAF slag was characterized for its mineralogy through XRD pattern using Rigaku X ray diffractometer with wavelength A Cu K The room temperature was maintained at 25 °C with scanning rate of 1°/min during the analysis X Pert High Score Plus software was used for the crystalline phase identification Larson and Von Dreele
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