Non-isothermal reduction kinetics of EAF dust-based pellets

Abstract Non-isothermal kinetics studies of the reduction phenomenon of electric arc furnace (EAF) dust generated in stainless steelmaking have been carried out. The dust was mixed with carbon as a reducing agent and dolomite as a binder to form pellets. A Thermo-Gravimetric Analyzer (TGA) was used to determine the weight loss of pellets heated at an average rate of 40 K/min. up to a temperature of 1500¡C. The degree of metal reduction was calculated by considering the pellet weight loss, and evaporation of moisture, dust, zinc and lead at high temperature. The reduction process was divided into three different steps. The first covers the 300¡C to 760¡C temperature range (from 7 to 18 min.), the second step ranges between 760¡C and 980¡C (18 to 24 min.), and the third covers temperatures above 980¡C. Each step is characterized by different chemical reactions. Non-isothermal reduction kinetics equations were set up to describe each step. The kinetics parameters such as apparent activation energies and frequency factors were established. It was found that the first step was chemically controlled, while the
Keywords: EAF dust, Waste recycling, Kinetics
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Summary: AgriumÕs history in fertilizer production and marketing goes back to 1931. Today, Agrium Inc. is a world leader in the production, distribution, and marketing of fertilizers and related products to the agricultural industry. Agrium is the largest North American producer of nitrogen fertilizers, a major producer of phosphate and potash fertilizers, and a world leader in fertilizer wholesale distribution and retail marketing. The mine at Kapuskasing is located some 40 km southwest of Kapuskasin...
Publication: CIM Bulletin
Author(s): R. Pressacco
Keywords: Industrial minerals, Phosphate, Agrium, Geology, Mining, Milling.
Issue: 1049
Volume: 94
Year: 2001
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Summary: The Big Whopper, one of only four giant economic rare metal pegmatites worldwide, is set to become a producer of the highly valued lithium mineral petalite (LiAlSi4O10) used in glass, ceramics and the specialty glass-ceramics familiar as Corningware¨ and the new ceramic stovetops. The deposit has a strike length of 1.5 km, a width of up to 80 m and a resource, open in all directions, of 11.6 Mt, grading 25% petalite. It is amenable to open pit mining and Avalon Ventures Ltd. holds a patent on...
Publication: CIM Bulletin
Author(s): G.H.K. Pearse, R.P. Taylor
Keywords: Big Whopper, Rare metals, Pegmatites, Industrial minerals, Geology.
Issue: 1049
Volume: 94
Year: 2001
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