BACKGROUND At present, the volumes of use electric arc furnace (EAF) dust are extremely insignificant. The their formation amount to thousands tons per month. During storage, they have a negative impact on environment. same time material that has valuable composition (oxides iron, non-ferrous metals, etc.) and is promising for recycling. However, secondary zinc-containing EAF in ferrous metallu...

In the present study, reduction of zinc oxide from the pellets made of steelmaking electric arc furnace dust has been investigated. Effects of such parameters as the type of carbon material (graphite, coke and charcoal) as well as time and temperature on the reduction reaction have been examined. The reduced (dimensionless) time method was applied to perform a kinetic analysis of the system. Ex...

Different wastes are generated in ferromanganese and silicomanganese alloy production. One of them is the ultrafine oxidized dust (UOD) produced in the collection and control of flying dusts in the ferroalloy industry. This waste has fairly high manganese content (20%–40% Mn), making it suitable to be a secondary raw material for the ferromanganese industry. This research proposes a method for ...

electric arc furnace (eaf) is one of the largest loads in electric power systems. it is highly time varying and nonlinear. its reactive power variations cause voltage fluctuations in nearby system which is known as flicker. on the other hand the nonlinear voltage-current characteristic causes strong voltage and current harmonics in eaf. to this end flexible ac transmission systems (facts) techn...

電気炉における生産性向上およびダスト量減少の方策を，10 t電気炉での各種スクラップの溶解実験結果および他の文献データ引用により解析した。C源添加，酸素吹き込みによるメタル酸化熱，C源燃焼熱の投入の結果，電力原単位が低下し通電時間が短くなった。なお，通電時間は酸素吹き込み量によってほぼ一元的に決まる。C源燃焼によるガス発生量（バブル生成量）が多いほど，ダスト発生量が増加した。ダスト発生量は，ダスト中のZn量とFe量によってほぼ一元的に決まる。ダスト中のZnとFeの化合物は，量の多い亜鉛フェライト，量の少ないヘマタイトおよび酸化亜鉛で構成されていた。新たに提示したダスト発生機構によると，バブル－バーストによってダストへ移行する元素はFeだけでなくZnも移行する。これらの解析結果を踏まえて，現状の実機電気炉の運転条件を基にした操業解析を行った。C源，酸素カットを行うことにより，電力原単位...

This article shows the preliminary results of a study carried out to determine technical feasibility encapsulating high percentage EAFD in cement-based mortars manufactured with fine fraction recycled concrete aggregates (RCA). Two families mortars, natural aggregate as reference and RCA, were studied. An incorporation rate by weight two parts mortar one part was tested. The mechanical strength...