Abstract

Dana Temirbekovna Pazylova*, Viktor Mikhaylovich Shevko, Alibek Spabekovich Tleuov, Nurila Saidullaevna Saidullayeva, Asiya Salidinovna Abzhanova and Nurzhamal Mahamatovna Ablyazimova

DOI : http://dx.doi.org/10.13005/ojc/350152

The presented article contains the research results on extraction of non-ferrous metals as inorganic chlorides from waste lead slags in the presence of chlorine-containing components of a distilled liquid – calcium and sodium chlorides. The research was implemented by a thermodynamic modelling technique using a software package HSC-5.11 Chemistry, based on a Gibbs energy minimum principle, and also a rototable second-degree method of planning an experiment (Box-Hunter method). It was found, that at equilibrium conditions lead is extracted from slags by chloride sublimation the most effectively, then zinc and copper: at pressure of 1 bar and temperature of 1500°С the chloride sublimation degree for lead makes 98.63%, for zinc – 64.45% and for copper – 21.91%. To achieve the 95-100% lead chloride sublimation  degree the necessary temperature is 933.7‒1300°С and lgP should be from –0.48 to –1.75 (pressure of 0.33-0.0177 bar); for achievement of the 90.0-100% chloride sublimation  degree for zinc respective parameters are T=1279.3–1500°C and lgP from –0.972 to –2 (pressure of 0.107-0,01 bar), for copper ‒ temperature of 1337.7–1500°С and lgP from –1.418 to –2 (pressure of 0.038-0.01 bar). It was experimentally proved, that at the sinter-chlorinating roasting at temperature of 1150-1180°С and pressure of 0.006-0.001 bar the chloride sublimation degree for lead makes 93-98%, for zinc ‒ 82-96%, for copper – 73-88%.

Chloride Sublimation of Lead; Distilled Liquid; Fuming Slags; Sinter-Chlorinating Roasting; Sodium and Calcium Chlorides; Thermodynamic Modelling; Zinc and Copper

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