Toplinska obradba elektropećne prašine niskotlačnom plinskom fazom

The paper presents the results of laboratory tests on the process of thermal reduction of electric arc furnace dust (EAFD) in the temperature range from 1273 to 1473 K. Before proceeding to the experimental tests, a thermodynamic analysis was made using the computer program FactSage® with the aim of determining the optimal conditions for the dust components reduction reaction to proceed. The results of tests carried out, respectively, under atmospheric pressure conditions and under reduced pressure conditions are presented, where carbon in the form of graphite and blast-furnace dust (containing approx. 40 % of carbon) was used as the reducer. The test results represent the effect of reduced pressure on the potential for intensifying the process of zinc removal from the dust. The degree of zinc extraction was considerably higher compared to the results of tests carried out under atmospheric pressure conditions.Toplinska obradba elektropećne prašine niskotlačnom plinskom fazom. Članak daje rezultate laboratorijskih istraživanja procesa toplinske obradbe elektropećne prašine (EPP) u temperaturnim intervalima 1273 K do 1473 K. Prije provođenja laboratorijskih opita ustrojena je termodinamička analiza računalnim programom FactSage(R) s ciljem određivanja optimalnih uvjeta reakcija procesa smanjenja komponenti prašine. Izlazni rezultati pokusa, pojedinačno, pod uvjetima atmosferskog i sniženog tlaka su predočeni, gdje je ugljik u grafitnom obliku i visokopećnoj prašini (sadržaj cca 40 % ugljika) bio reducent. Rezultati pokusa daju efekt sniženog tlaka na potencijal za intenzificiranje procesa uklanjanja cinka iz prašine. Stupanj uklanjanja cinka je znatno viši u usporedbi s pokusima izvedenim pri normalnim atmosferskim uvjetima