Lead extraction in low-temperature dust roasting during metal scrap melting in electric arc furnace together with ammonium chloride

Dosmukhamedov N.K. Koishina G.M. Zholdasbay E.E. Kurmanseitov M.B.
2024 Ore and Metals Publishing house

CIS Iron and Steel Review
2024 #28 104 - 109 pp.

Processing of zinc-containing dust from conventional steel making processes is rather actual problem and causes necessity to research and develop the new technologies. Possibility of selective lead extraction via low-temperature roasting of preliminary separated non-magnetic fraction of zinc-containing dust together with ammonium chloride is shown in this work. Based on the results of thermodynamic calculations of Gibbs free energy for interaction reactions between oxides of lead, zinc and iron with NH₄Cl, possibility of selective lead extraction from dust in the form of its chloride is displayed. The results of thermodynamic analysis are confirmed by the data of laboratorial experiments, when influence of temperature and chloride ammonium consumption on degree of lead sublimation was examined. Dramatic lowering of lead content in a cinder was revealed within the temperature range from 300 °С to 500 °С. The minimal lead content in a cinder was 0.18 %, it was reached at 600 °С. Further temperature rise has slight effect on decrease of lead content in a cinder. Optimal technological parameters were established: Temperature – 500 °С, NH₄Cl consumption – the value exceeding its stoichiometric required amount (SRA) for lead chlorination by 1.5 times, roasting duration – 60 min. A cinder with minimal lead content with the following composition, % (mass.): ~49 Zn; 0.2 Pb; 19 Fe; 8 SiO₂ and other, was obtained for the optimal technological parameters. Lead extraction in fumes was high, more than ~97 %. The obtained results will be used in building of the complex technology for processing of zinc-containing dust and other products with similar composition from iron and steel enterprises.

ammonium chloride , chlorination , cinder , extraction , fumes , gibbs free energy , lead , roasting , temperature , zinc , zinc-containing dust

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Satbaev University, Almaty, Kazakhstan
Zhezkazgan University named after O. Baikonurov, Zhezkazgan, Kazakhstan

Satbaev University
Zhezkazgan University named after O. Baikonurov

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026