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Effect of carbon on the solubility of nitrogen in slag
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. (Processer)ORCID-id: 0000-0001-5080-8401
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. (Processer)ORCID-id: 0000-0002-3548-8638
2015 (Engelska)Ingår i: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 106, nr 8, s. 822-830Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effect of carbon on nitrogen solubility in slag was investigated for the ternary CaO-MgO-SiO2 and the quaternary Al2O3-CaO-MgO-SiO2 slag systems at 1 873 K under controlled oxygen and nitrogen potentials. Gas-slag equilibration experiments were conducted using molybdenum and graphite crucibles. In the absence of carbon, the nitrogen solubility was very low. The presence of carbon greatly increased the nitrogen solubility in slag. The total nitrogen content was found to increase with SiO2 and MgO concentration for the carbon saturated slags. Low levels of cyanide were found by wet chemistry with considerable uncertainty. The results analyzed by different methods ruled out cyanide formation being the main reason for the large increase in nitrogen solubility in the presence of pure carbon.

Ort, förlag, år, upplaga, sidor
2015. Vol. 106, nr 8, s. 822-830
Nyckelord [en]
Nitrogen, Solubility, Slag, Cyanide, Nitride
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:kth:diva-173283DOI: 10.3139/146.111253ISI: 000359388900001Scopus ID: 2-s2.0-84981328388OAI: oai:DiVA.org:kth-173283DiVA, id: diva2:852584
Anmärkning

QC 20150909

Tillgänglig från: 2015-09-09 Skapad: 2015-09-09 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
Ingår i avhandling
1. Sulfur and nitrogen in ladle slag
Öppna denna publikation i ny flik eller fönster >>Sulfur and nitrogen in ladle slag
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The present work deals with some aspects of slags related to secondary metallurgy in the steelmaking process. More specifically the focus is given to sulfur and nitrogen in ladle slags. Even though slags have been fairly well-researched in the past, the available data for these elements in typical ladle slag compositions is rather scarce. In some cases the available data is in discordance. There are also inconsistencies between the literature data and what is commonly observed in the industrial processes.

Sulfide capacities were measured at steelmaking temperatures, 1823–1873 K, in ladle slags. The data was found to be in reasonable agreement with the industrial process norms. The sulfide capacity was found to increase with the basic oxides CaO and MgO; and decrease with the acidic components Al2O3 and SiO2. The sulfide capacity was also found to increase with temperature.

The dependence of sulfide capacity on the oxygen partial pressure, for slags containing multivalent elements, was investigated experimentally at 1873 K with a slag containing vanadium oxide. A strong dependence of oxygen partial pressure was observed. The sulfide capacity increase by more than two orders of magnitude when the oxygen partial pressure was increased from 4.6×10-16 atm to 9.7×10-10 atm.

The nitrogen solubility and the effect of carbon was investigated in typical ladle slags and the CaO–MgO–SiO2 system at 1873 K. Carbon increases the nitrogen solubility substantially. In the absence of carbon, the nitrogen solubility is extremely low. Low concentrations of cyanide was detected in the carbon saturated slag. This was much lower than the total nitrogen content and formation of cyanide cannot explain the large increase.

The possibility of removing sulfur with oxidation from used ladle slag was investigated experimentally at 1373–1673 K. The sulfur removal of mostly solid slag was found to be a slow process, and would not suitable for industrial practice. At 1673 K the slag was mostly liquid and more than 85% of the sulfur was removed after 60 min of oxidation in pure oxygen atmosphere.

 

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2016. s. vi, 74
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
Teknisk materialvetenskap
Identifikatorer
urn:nbn:se:kth:diva-182981 (URN)978-91-7595-845-3 (ISBN)
Disputation
2016-04-01, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20160229

Tillgänglig från: 2016-02-26 Skapad: 2016-02-24 Senast uppdaterad: 2016-02-29Bibliografiskt granskad

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