Zinc recovery by ultrasound acid leaching of double kiln treated electric arc furnace dust
The need to convert 70,000 tons a year of electric arc furnace (EAF) dust into an environmentally safe or recyclable product has encouraged studies to reclaim zinc from this waste material. Successful characterization of a double-kiln calcine, produced from EAF dust, has shown that the calcine pellets consisted mainly of zinc oxide plates with some iron oxide particles. Preliminary leaching tests using hydrochloric and sulfuric acids indicated that this calcine is suitable for selective ultrasound leaching of zinc. A factorially designed screening test using hydrochloric acid showed that ultrasound significantly lowered iron dissolution and increased zinc dissolution, thus enhancing the selective leaching of zinc. Ultrasound, temperature, air bubbling rate and acidity increased the sulfuric acid selectivity, while fluorosilicic acid was not selective. Reactor characterization through ultrasonic field measurements led to the selection of reactor and ultrasound bath, which were utilized to enhance the selectivity of a laboratory scale sulfuric acid leaching of a double-kiln treated electric arc furnace dust. Results indicated that ultrasonic leaching of this calcine is a satisfactory technique to selectively separate zinc from iron. After further iron removal by precipitation and cementation of nickel, it was possible to electrowin zinc from the leach liquor under common industrial conditions, with current efficiencies from 86% through 92% being observed. Calcine washing showed that a substantial chloride removal is possible, but fluoride ion in the electrolyte caused deposit sticking during electrowinning.
- Research Organization:
- Missouri Univ., Rolla, MO (United States)
- OSTI ID:
- 5608685
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ARC FURNACES
DUSTS
ZINC
MATERIALS RECOVERY
CALCINED WASTES
DISSOLUTION
HYDROCHLORIC ACID
KILNS
LEACHING
RECYCLING
SULFURIC ACID
ULTRASONOGRAPHY
CHLORINE COMPOUNDS
ELECTRIC FURNACES
ELEMENTS
FURNACES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MANAGEMENT
MATERIALS
METALS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RECOVERY
SEPARATION PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management