4 edition of Nitrogen solubility in molten slags found in the catalog.
Nitrogen solubility in molten slags
Jardel Prata Ferreira
Thesis (M.A.Sc.)--University of Toronto, 1992.
|Series||Canadian theses = Thèses canadiennes|
|The Physical Object|
|Pagination||3 microfiches : negative.|
This explains good solubility of nitrogen in slags, molten in graphite crucibles. Dissolved in slag nitrogen may transfer to the interface slag-metal and than dissolve in the metal melt or remain in the slag without transition into the other phase. Solubility of carbon dioxide, nitrogen, and argon in molten zinc chloride. The Journal of Chemical Thermodynamics , 7 (7), .
slags. By increasing the basicity, the solubility of water is increased,20,23 The temperature on the other hand has been found to have negligible effect on the solubility of water vapour in metallurgical slags,24 This can be attributed to low heat of solution of water vapour in metallurgical slags, Solubility of Nitrogen. The nitrogen solubility data are summarized by the following equations and are shown graphically in Fig ½N 2 =3852 (1) The equilibrium constant for nitrogen absorption is therefore: K=[ppmN] / (p N2) ½ (2) And reaction constant of this equation is related to the free energy; (3).
Experimental results shown that there is saturated solubility, while smelting 18Mn18CrN steel with high pressure and bottom blowing nitrogen. Thermodynamic calculation model nitrogen solubility under the condition of high pressure was established, and the influence of nitrogen partial pressure on saturated solubility was researched. Also, large quantities of oxygen and nitrogen in the molten metal can lead to porosity, because there’s a significant decrease in solubility at the freezing point. This means that as the metal becomes solid, it can’t handle as much oxygen or nitrogen. But these gases have to go somewhere, so they escape to the atmosphere.
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The gases include hydrogen halides, inert gases, oxygen, nitrogen, hydrogen, carbon dioxide, water vapor and halogens. The molten salts consist of single salts, binary mixtures and multicomponent systems. Included also, is a special section on the solubility of gases in molten silicate systems, focussing on slags and fluxes.
Nitrogen solubility in molten CaO-SiO2 slags by H.G. Oltmann*, R.J. Dippenaar**, and P.C. Pistorius† Synopsis The equilibrium nitrogen solubility in the CaO-SiO2 system was studied by a slag-gas equilibration technique, in graphite crucibles at K under a CO-N2 atmosphere.
The nitrogen content of the slags was determined by the Kjeldahl. Hydrogen solubility was determined in synthetic slags as function of temperature and slag composition; on basis of results, mechanism of hydrogen dissolution in molten slags is Author: In-Ho Jung.
nitrogen dissolution is enhanced by the presence of basic or acidic components. In this study, the solubility of nitrogen in molten CaO SiCaF2 and CaO(MgO, BaO)-SiOrCaF2 systems has been measured.
The effects of oxygen partial pressure, temperature and slag basicities on nitrogen dissolution in slag are also discussed. to study the possibility of nitrogen reﬁning by top-slag with high nitrogen capacity during ladle treatment.
Cyanide: when carbon and nitrogen coexist, cyanide could dissolve in molten slags. Because cyanide Nitrogen solubility in molten slags book harmful and toxic the solubility should be minimized in slags for the disposal without causing environmental problem.
Three studies have been conducted concerning thermodynamics and kinetics of dissolution of alumina, copper oxides and nitrogen in various molten slags.
In the first study, the dissolution rate of alumina particles in molten CaO-Al2O3-SiO2 slag was measured at °C by direct sampling method for the purpose of understanding the dissolution behavior of alumina inclusion in molten slags. The dissolution behaviors of nitrogen, carbon and cyanide in binaries, ternaries and high order slag systems in the CaO–MgO–Al 2 O 3 –SiO 2, CaO–B 2 O 3 and Na 2 O–B 2 O 3 systems are thermodynamically modeled in the present study using the hybrid model which is an integration of the capacity model and the modified quasichemical model.
In combination with previous FACT. Solubilities of nitrogen and carbon in molten CaO-Al2O3 slags were measured to discuss the form of nitrogen. Samples were melted in graphite crucibles and N2-CO gas mixtures were equilibrated with. Key words: oxygen potential, nitrogen solubility, nitrogen valence, solid electrolyte, nitride capacity, free nitride, incorpora ted nitride, ladle treatment: 1.
Introduction The reliable data on the solubility of nitrogen in slag melts are. The molten metal coexistence theory indicates that there are atoms and molecules in the structural units of molten metal, which are in dynamic equilibrium and the chemical reactions in the system meet mass action law.
At 1 K, the solubility of nitrogen in metal melt in mass percent is %[5 J. Gas solubilities in molten salts and silicates solubility of carbon dioxide. Its solubility can also be controlled by HC1/H20 gas mixture as follows 2HC1 + 2-H20 + 2C1 (4) Nitrogen monoxide and dioxide solubilities in sodium nitrate—nitrite mixture were also determined by Tremillom et al.
as functions of either oxygen pressure or p02(E. Solubility of nitrogen in slag, in opinion of many researchers, follows Sieverts law and depends upon degree of oxidation of the gas phase above molten slag [16, 27]. Driving force of nitrogen movement is difference of its concentrations according to the degree of oxidation of different molten slag layers.
The solubilities of nitrogen in CaO-SiO 2-Al 2 O 3 slags were measured using N 2-H 2 gas or silicon nitride ceramics at K. Moreover Vickers hardness of the quenched slags was measured. Based on these results, the dissolution mechanism of nitrogen into the slags. The solubility of silver in molten CaO-B 2 O 3 and BaO-B 2 O 3 slags at high temperatures was measured to seek a new measure of the basicity of slags.
The B 2 O 3-bearing fluxes, which have wide range of liquids at the temperature of interest, have been applied to investigate the effects of flux composition on the solubility of silver from the saturation of acidic or basic.
A method is presented for computing the solubility of nitrogen in molten alloy steels. Examples are given to illustrate the procedure, and comparisons are made between predicted and measured nitrogen solubilities. LANGENBERG, Junior Member AIME, formerly Visiting Fellow, Massachusetts Institute of Technology.
The dissolution rates of silicon nitride (Si 3 N 4) ceramics into CaOAl 2 O 3 SiO 2 slags were investigated by using a rotating specimen method in the temperature range of – K. Dissolution rates in the present study increased as the revolution speed and temperature increased and decreased as the SiO 2 content of the slags increased.
The nitrogen content of the slags. The slag is a liquid mixture of ash, flux, and other impurities. This reduction of slag viscosity with temperature, increasing the flow of slag in smelting, is the original origin of the word flux in metallurgy.
Fluxes are also used in foundries for removing impurities from molten nonferrous metals such as aluminium, or for adding desirable. Values for the physical solubility of nitrogen as well as for the content of chemically dissolved nitrogen in glass melts are given.
The form in which the nitrogen is present in the glass melts is discussed and an attempt is made to explain chemical interaction between nitrogen. Based on the established thermodynamic model, the effect of C content on nitrogen solubility in molten steel was investigated.
The nitrogen solubility increases with the decrease of C content and the increase of temperature. In order to obtain higher N content in steel, C content must be controlled at a low range of ~%. The effect of carbon on nitrogen solubility in slag was investigated for the ternary CaO–MgO–SiO 2 and the quaternary Al 2 O 3 –CaO–MgO–SiO 2 slag systems at K under controlled oxygen and nitrogen potentials.
Gas–slag equilibration experiments were conducted using molybdenum and graphite crucibles. Nitrogen solubility in molten CaO-SiO2 slags. AUTHOR HG Oltmann, RJ Dippenaar, PC Pistorius. file vn02ppdf description Journal Paper Vol - No 02 - Pg page Add comment.
Name (required) E-mail (required, but will not display) Notify me of. Nitrogen reservoirs. In terms of total mass, the main reservoir is the mantle (Table 1).However, the summary in Table 1 does not include the Earth’s core for which nitrogen estimates vary significantly (Dalou et al.
; Roskosz et al. ).Major uncertainties affecting assessment of the nitrogen abundance in the core are silicate/melt partition coefficients, the .This paper critically discusses the structure, properties and applications of ironmaking and steelmaking slags and their silicate-based variants as low-cost adsorbents for removing cations and anions from industrial effluents and wastewater.
Undoubtedly, the performance of slag-based adsorbents depends on their physical, chemical and phase chemical properties.