Processing Dross from Hot-Dip Galvanizing by Chlorination Roasting

Nurlan Kalievich Dosmukhamedov, Arkady Kaplan, Erzhan Esenbaiuly Zholdasbay, Gulzada Myngyshkyzy Koishina, Yeleussiz Bolatovich Tazhiev, Aidar Argyn, Yerzhan Itemenovich Kuldeyev and Valery Kaplan
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Nurlan Kalievich Dosmukhamedov: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Arkady Kaplan: Arvak Tech. LLC, Rehovot 76000-76878, Israel
Erzhan Esenbaiuly Zholdasbay: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Gulzada Myngyshkyzy Koishina: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Yeleussiz Bolatovich Tazhiev: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Aidar Argyn: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Yerzhan Itemenovich Kuldeyev: Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050000, Kazakhstan
Valery Kaplan: Weizmann Institute of Science, Rehovot 76000-76878, Israel

Sustainability, 2021, vol. 13, issue 22, 1-12

Abstract: Dross from hot-dip galvanizing is an important source of pure zinc ingots and zinc oxide for use as mineral additives in animal and poultry feed. Thermodynamic calculations have shown the possibility of solving the issue of dross processing by roasting using CaCl 2 and NH 4 Cl. The influence of the consumption of chlorinating reagents, the roasting temperature on the degree of sublimation of Pb, Fe, Ni, Cu and Cd has been investigated. It has been shown that the best results are achieved when roasting the dross with the simultaneous use of CaCl 2 and NH 4 Cl in amounts of 6 and 15% by weight of the feed material. The optimal roasting parameters were established: T = 1000 °C, duration—60 min, air flow—0.1 L/min. Recovered pure zinc oxide composition (%) was: 0.05 Pb, 0.15 Fe, 0.06 Ni, 0.003 Cu and 0.001 Cd. The degree of sublimation of copper, nickel and iron chlorides was ~75%, with lead and cadmium at 90–98% of their initial amount in the dross.

Keywords: dross; roasting; calcium chloride; ammonium chloride; impurities; sublimation; extraction; zinc; zinc oxide (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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