- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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Metallurgical dusts can be recycled through direct reduction in rotary hearth furnaces (RHFs) via addition into carbon-based composite pellets. While iron in the dust is recycled, several heavy and alkali metal elements harmful for blast furnace operation, including Zn, Pb, K, and Na, can also be separated and then recycled. However, there is …
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A mathematical model has been developed by coupling genetic algorithm (GA) with heat and material balance equations to estimate rate parameters and solid-phase evolution related to the reduction of iron ore-coal composite pellets in a multi-layer bed Rotary hearth Furnace (RHF).
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This study investigates the dezincification behavior of a commercial-scale rotary hearth furnace used to recycle the byproduct dust. A mathematical model of iron-ore/carbon-composite pellets was developed, incorporating a one-dimensional dynamic …
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A new ironmaking concept is being proposed that involves the combination of a rotary hearth furnace (RHF) with an iron-bath smelter. The RHF makes use of iron-oxide-carbon composite pellets as the charge material and the final product is direct-reduced iron (DRI) in the solid or molten state. This part of the research includes the …
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The coal-based reduction industrial equipment can be developed based on the existing pyrometallurgical equipments, rotary hearth furnace and rotary kiln, which are introduced briefly. However, coal-based reduction currently mainly adopts coal as a reductant and fuel, which may result in high levels of carbon dioxide emissions, energy ...
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In order to improve the efficiency of slag and iron separation, a new idea of "the separation of slag (solid state) and iron (molten state) in rotary hearth furnace process at lower temperature" is put forward. In this paper, the forming process of iron nuggets has been investigated. Based on those results, the forming mechanisms and …
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Reduction of iron ore–coal composite pellets in multi-layers at rotary hearth furnace (RHF) is limited by heat and mass transfer. Effect of various parameters like pellet shape, size, and bed packing material that are supposed to influence the heat and mass transfer in the pellet bed, have been investigated, on the reduction behaviour of …
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Kinetics of Coal-based Reduction in a Rotary Hearth Furnace. Although the same fundamental reactions occur in an RHF as in an RK, ... The Krupp–Renn is an iron ore reduction process designed for low-grade ores that at one time had over 40 commercial installations, but high energy costs and availability of higher-grade ores led …
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a coal-based reduction process using a rotary hearth furnace (RHF) in collaboration with MIDREX Technologies, a subsidiary of Kobe Steel in the USA. This process involves carbon composite agglomerates, in the form of pellets or briquettes, laid on the hearth of the RHF, in which the composite agglomerates are heated and reduced in a static manner.
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The coal-baseddirect reduction conceptutilizing the rotary hearth furnace is a simple one. The RHF consists of a flat, refractory hearth rotating inside a stationary, circular tunnel kiln. Inside the RHF, direct reduction of iron oreor iron-bearingby-productsoccurs,usingcoalas the reductant. For decades, rotary hearth furnaces have
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In almost all direct reduction ironmaking technologies that use a rotary hearth furnace (RHF), the RHF reduces iron ore to about 80 percent. A secondary smelting facility removes the remaining other material (gangue) from the ore. The DRI produced is usually taken to an EAF for final reduction and gangue removal.
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Two strategies to use a rotary hearth furnace (RHF) are discussed from the perspectives of techno-economics and CO 2 reduction. One is to use the RHF to produce low-reduced iron (LRI), which is then used in a blast furnace (BF); the other is to use the RHF to produce direct reduced iron (DRI) and use it in an electric arc furnace (EAF).
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In conjunction with an electric arc furnace (EAF) process, a rotary hearth furnace (RHF) has emerged as a supplementary ironmaking unit to produce extra iron from iron-bearing solid wastes from an integrated steel plant. Additionally, such units offer fuel-switching options to low-carbon input fuels.
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A thermodynamic model has been developed for the estimation of carbon dioxide (CO2) emissions from rotary hearth furnace (RHF) using different reductant coals and external fuel gases for the production of sponge iron. The model developed incorporates coal pyrolysis and ore reduction.
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