Modelisation thermodynamique du smeltage du plomb dans un haut fourneau.

摘要

Four liquid phases have been modeled thermodynamically: lead bullion (11 solutes in lead), the matte phase (6 components), the speiss phase (6 components) and the slag phase (11 components). Over 800 references from current and past literature have been surveyed covering the subject of the thermodynamic properties or phase diagrams relative to these four solutions. These data were optimized with the help of software to obtain the coefficients of the models. These models can then be used to calculate the thermodynamic properties and the phase diagrams within experimental error limits. The resultant calculated properties and phase diagrams are thermodynamically consistent and represent the best estimates which can be achieved considering available experimental data.;The Noranda Technology Center in Pointe-Claire, Quebec, is contemplating the possibility of developing a new direct smelting process for Cu-Pb-Zn concentrates. Their main objective is to be able to extract these metals from mine tailings, from waste-water treatment sludge, from electric-arc furnace (EAF) dust, etc. These waste materials contain a significant amount of metal. Furthermore, some of these wastes are classific as dangerous material whose disposal costs are high and climbing. The Noranda Technology Center would like to be able to simulate the proposed processes thermodynamically in order to reduce the development time and to better assess the feasibility of the metallurgical processes.;In meeting this objective, it is necessary to model thermodynamically the four liquid phases that can occur in the process, that is: the lead bullion, the speiss (arsenide phase), the matte (sulfide phase) and the slag (oxide phase). A thermodynamic model is defined as a mathematical representation of the thermodynamic properties of a phase in relation to its composition and temperature. (Abstract shortened by UMI.).