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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium REWAS 2022: Recovering the Unrecoverable
Presentation Title Characterization and Thermal Treatment of Electric Arc Furnace Dusts Generated during Steel Production in Peruvian Industries
Author(s) Mery Cecilia Gomez-Marroquin, Jose Carlos C. DŽAbreu, Roberto R. de Avillez, Sonia Letichevsky, Kim J. Phatti - Satto, Abraham J. Terrones - Ramirez
On-Site Speaker (Planned) Mery Cecilia Gomez-Marroquin
Abstract Scope Self-reduction is a pyrometallurgical treating process which aims to valuable metal recovery from mining-metallurgical industry wastes, mainly from steelmaking industries. Electric Arc Furnace Dusts (EAFD) are still the most attractive materials to be tested in using this technique, due to their high magnetite and franklinite/zinc ferrite contents. This research will address the reuse of these co-products in steel plants, providing added value to this material that until now is constituted as an environmental liability of considerable economic importance in steelmaking industries. Chemical and microstructural analysis have determined high contents of iron and zinc from magnetite and franklinite/zinc ferrite. Iron was present in the non-stoichiometric form of “hapkeite” (Fe1.34Si0.06) in both EAFD 1 and EAFD 2. A rare appearance of Moissanite CSi –2H was also found in EAFD 1. Thermogravimetric evaluations allowed elimination of almost 15 % of volatile matter at 1000 °C in EAFD 1. EAFDs were partially reduced and showed a high porosity, which would make it possible for the recovery of its main metal content by carbothermic self-reduction. Proximate analysis, and carbon dioxide reactivity of two reductants were tested for evaluating the behavior of selected reductants in carbothermic self-reduction of EAFDs using a procedure given by the Steelmaking and Ironmaking Group of DEQM PUC/RJ. This mixture included 85% (EAFD + coal), 6% CPV ARI, and 9% water. Operational Diagram of Phase Predominance (ODPP) from the Zn-Fe-C-O system was used to calculate the required carbon and to guarantee the occurrence of the global chemical reactions of carbothermic reduction either in franklinite/zinc ferrite as in magnetite by 100% CO, and temperatures between 1000°C to 1100°C. In these conditions, self-reducing briquettes of EADF 2 lost more weight so reacted faster than EAFD 1. Finally, reactions rates of carbothermic self-reducing briquettes EAFDs were very fast during the first 5 minutes and retarded from 5 to 40 minutes. Keywords: Self-reduction, Carbothermic reduction, Electric Arc Furnace Dusts-EAFD, Steelmaking residues, Processing & Extraction, Environment effects, Recycling & Secondary Recovery
Proceedings Inclusion? Planned:
Keywords Extraction and Processing, Environmental Effects, Recycling and Secondary Recovery

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Green Process to Acquire a High Purity Rare Earth Elements Leach Liquor from Nd-Fe-B Magnets by Caustic Digestion and Roasting Processes
Adaptability of the ISASMELT™ Technology for the Sustainable Treatment of Wastes
An Innovative Separation Process for Spent Lithium-ion Battery Using Three-stage Electrodialysis
BlueMetals Technology – Experience from Commissioning E-Scrap Recycling Plants
Characterisation of Hyperaccumulators for Lithium Recovery from Ancient Mine Soils
Characterization and Thermal Treatment of Eggshell and Olive Stones for Heavy Metals Removal in Mining Environmental Liabilities Sites
Characterization and Thermal Treatment of Electric Arc Furnace Dusts Generated during Steel Production in Peruvian Industries
Deoxidation of Titanium Using Cerium Metal and Its Oxyhalide Formation
Development of Technology for Recycling Large-capacity Lithium-ion Batteries for EV,ESS
Efficient Steel Mill Dust Recycling – Aiming For Zero Waste
Estimation of the Generation and Value Recovery from E-waste Printed Circuit Boards: Bangladesh Case Study
Extraction of Nickel from Recycled Lithium-ion Batteries
Investigation of Hydrometallurgical Recycling Parameters of WC-Co Cutting Tool Scraps
Leaching of Rare Earth Elements from Phosphogypsum Using Mineral Acids
Maximizing the Efficiency of By-product Treatment by Multi Metal Recovery and Slag Valorization
Physicochemistry of Lithium-ion Battery Recycling Processes
Pre-study of the Dissolution Behavior of Silicon Kerf Residue in Steel
Recent Trend on the Studies of Recycling Technologies of Rare Earth Metals
Recovery of Copper, Iron and Alumina from Metallurgical Waste by Use of Hydrogen
Recovery of Precious Metal Silver from Scrap Computer Keyboards
Recovery of Terbium, Europium, and Yttrium from Waste Fluorescent Lamp Using Supercritical Fluid Extraction
Recycling of Electronic Wastes, Waste Batteries and Rare Metal Wastes in China
Recycling of Tungsten by Molten Salt Processes
Recycling Technologies Developed at KIGAM
Setting New Standards for Circular Economy in the Cement Industry
Shifting the Burden of Selectivity from Chemical to Physical Separation Processes via Selective Sulfidation
Utilization of Copper Nickel Sulfide Mine Tailings for CO2 Sequestration and Enhanced Nickel Sulfidization
Yellow Phosphorus Production from Phosphoric Acid by Carbothermic Reduction

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