Scribd is the worlds largest social reading and publishing site. Estos diagramas fueron construidos por primera vez por harold ellingham en 1944. This teaching and learning package incorporates an interactive ellingham diagram. In metallurgy, the ellingham diagram is used to predict the equilibrium temperature between a metal, its oxide, and oxygen and by.
Chapter 11 multicomponent, multiphase reacting systems. The oxygen partial pressure is taken as 1 atmosphere, and all of the reactions are normalized to consume one mole of o2. G0 of various oxides and sulfides using one mole of oxygen with temperature ellingham found that, the standard enthalpy and entropy of formation of a compound dont change significantly with temperature as long as there is no change of. Pdf the main subject of this article is to show the parallelism betwen the ellingham and vant hoff diagrams. G of a reaction is a measure of the thermodynamic driving force thatmakes a reaction occur. Doitpoms tlp library ellingham diagrams the interactive. As mentioned above, the equilibrium oxygen partial pressure can be calculated from equation. Richardson and jeffes improved the ellingham diagram by adding a nomographic scale, which is designed so that the equilibrium oxygen partial pressure between metal and its oxide can be read off directly at a given temperature. This document was uploaded by user and they confirmed that. In this chapter, thermochemical fundamentals of the ellingham diagram are described.
S are essentially constant with temperature unless a phase change occurs, the free energy versus temperature plot can be drawn as a series of straight lines, where. Moreover, we can learn how to use nomographic scales added to the diagram. G indicates that a reaction can proceedspontaneously without external inputs, while a positiv. An ellingham diagram is a graph showing the temperature dependence of the stability of compounds. The ellingham diagram ellingham1 plotted experimentally determined standard free energy of formation. Mar 30, 2016 this file contains additional information such as exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. The interactive ellingham diagram included within this tlp is a teaching and learning tool, which you can use to obtain a variety of useful thermodynamic information pertaining to a wide range of reactions. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulfides. What are ellingham diagrams san jose state university. Baixe no formato pdf, txt ou leia online no scribd. Descargue como docx, pdf, txt o lea en linea desde scribd. The ellingham diagram is a tool most often used in extraction metallurgy to find the conditions necessary for the reduction of the ores of important metals. Click on this link to launch the interactive ellingham diagram in.
An example of ellingham diagram is shown in figure 1 below. The ellingham diagram is helpful to understand the equilibrium in heterogeneous systems including metal, its oxide, and gas phase. Ragone this type of diagram is generally referred to as an ellingham diagram. Pdf rayner quimica inorganica descriptiva alvaro gonzalez. Click on this link to launch the interactive ellingham diagram in a new window. In metallurgy, the ellingham diagram is used to predict the equilibrium temperature. Interactive ellingham diagrams at san jose state university. These diagrams were first constructed by harold ellingham in 1944.
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