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Rotary hearth furnace process for steel mill waste recycling and direct reduced iron making - Volume 100 Issue 4 ... In addition, the DryIron TM Process can also produce direct reduced iron from iron ore and non-coking coal. In this paper, the features of the DryIron TM Process and the machine outline in Hikari Works of Nippon Steel ...
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The invention relates to a method for producing directly reduced, desulfurized iron in a multiple-hearth furnace which comprises two zones arranged one above the other and each having several hearths. Iron ore is reacted with a reducing agent in a first zone of the multiple-hearth furnace at a temperature ranging from 800° C. to 1100° C. to obtain metallic iron.
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is why direct reduction is of particular in terest to many developing nations. A Century of Development The idea of direct reduction as an alterna tive to the conventional way of making iron and steel is not new even in the developed countries. In 1869 William Siemens, who a dozen years earlier had designed the first open-hearth furnace and ...
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A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of discharging reduced …
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Direct reduction ironmaking is a technological process of smelting ore into metallic iron under the condition of solid ore or solid–liquid mixed state [3]. Compared with traditional blast furnace …
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US8133299B2 US12/513,872 US51387207A US8133299B2 US 8133299 B2 US8133299 B2 US 8133299B2 US 51387207 A US51387207 A US 51387207A US 8133299 B2 US8133299 B2 US 8133299B2 Authority
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The invention relates to a method for producing directly reduced, desulfurized iron in a multiple-hearth furnace which comprises two zones arranged one above the other and each having several hearths. Iron ore is reacted with a reducing agent in a first zone of the multiple-hearth furnace at a temperature ranging from 800° C. to 1100° C. to obtain metallic iron.
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The U. S. steel industry has reduced its energy intensity per ton of steel shipped by 33% since 1990. However, further significant gains in energy efficiency will require the development of new, transformational iron and steelmaking processes. The Paired Straight Hearth Furnace (PSH) process is an emerging alternative high productivity, direct reduced iron …
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One of the alternative technologies is direct reduction. World Direct Reduced Iron (DRI) production has grown almost continuously since 1970 being 73.3 Mt in 2011 (Fig. 1). Although the vast majority of DRI is used in the EAF, direct reduced iron can also be charged into BOF as a scrap substitute and into BF in order to increase productivity. In
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Abstract. A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of …
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The purposes of using direct reduction iron in electric furnace production are: (1) dilute the hazardous elements and significantly enhance steel quality; (2) induce carbon boil during melting, create ed slag, facilitate melting of furnace burden, decrease content of nitrogen and hydrogen in steel, protect the lining, and shorten refining ...
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The MIDREX® Direct Reduction Process employs a shaft furnace to convert iron ore into DRI using natural gas or syngas from coal. The MIDREX® Process is energy efficient and flexible, …
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The document discusses the production of direct reduced iron (DRI) using a rotary hearth furnace (RHF). DRI is produced by reducing iron ore to a purity of 90-97% iron through a process using reducing gases like …
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direct reduction or hot metal processes to process waste oxides from either EAF mini-mills or fully integrated plants. Coal based DRI process can feed a hot metal process- SAF, HIsmelt, etc, …
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With the MULTIPOL, ThyssenKrupp Polysius has taken the lead in the market for the supply of multiple hearth furnaces, particularly in the refractory materials industry. The MULTIPOL is …
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To enhance the reduction of multiple layers carbon containing pellets in rotary hearth furnace (RHF) process, a three-layer bed pellets were investigated using an electric furnace by simulating the RHF process. It was found that the metallization rate of the pellets on the upper layer was greatly higher than that on the middle and lower layers due to the low reduction efficiency and …
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Developments in the use of rotary hearth furnaces for coal-based direct reduction of iron go back at least to the development of the HeatFast Process at the Surface Combustion Company in the 1960s [74]. However, Surface Combustion and its parent company Midland-Ross Corporation decided to focus on its gas-based technology, which became the ...
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The Paired Straight Hearth Furnace (PSH) process is an emerging alterna-tive high productivity, direct reduced iron (DRI) technology that may achieve very low fuel rates and has the potential …
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processes as well as the multiple hearth furnace Primus (Primorec). As the direct reduction processes do not produce liquid hot metal quality like the blast furnace the development of iron ore ...
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Dezincification, or the removal of Zn from the product (direct reduced iron; DRI, or low reduced iron; LRI), is an important factor in the recycling process. Firstly, Zn content in DRI charged into the BF must be below 0.5 wt% [12], as Zn is retained during the condensation-vaporization steps in the BF and accumulates in the furnace, reducing ...
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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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Straw fiber is a waste obtained by jet milling after extracting valuable substances form corn straw through steam explosion‐washing‐mechanical carding process. At the same time, it is also a clean and renewable reducing agent. In this study, physical and chemical characteristics of straw fiber were investigated firstly. The usage of straw fiber in rotary hearth …
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Multiple Hearth Furnaces are designed and built to be run year round with minimal internal maintenance, meaning fewer shut-downs. Some customers even mortar the doors shut because they hardly ever need to open them. The fans …
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This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on "Alternative Iron Making Process". 1. The Solid iron produced by direct reduction of iron ore is popularly known as? a) Cast iron b) White iron ... Reduction is done in Rotary hearth furnace where the composite pellet system is followed. 5. In bath smelting ...
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View a listing of applications for Multiple Hearth Furnaces from Industrial Furnace Company
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US20100031778A1 US12/513,872 US51387207A US2010031778A1 US 20100031778 A1 US20100031778 A1 US 20100031778A1 US 51387207 A US51387207 A US 51387207A US 2010031778 A1 US2010031778 A
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A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of discharging …
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electric arc furnaces, O direct reduction processes to feed electric arc furnaces or to produce DRI/HBI to feed blast ... O direct reduction or hot metal processes to process waste oxides from either EAF mini-mills or fully integrated plants. 2 DIRECT REDUCED IRON ( DRI/HBI ) ... -----Rotary Rotary Fluid Shaft Fluid Kiln Hearth Bed Furnace Bed
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The FASTMET process uses a Rotary Hearth Furnace to rapidly reduce iron ore pellets, fines, and steel mill waste into direct reduced iron using pulverized coal. Agglomerates consisting of iron ore, waste, and coal are heated to 1350°C in the furnace to promote reduction reactions that convert the iron oxide into iron within 8-16 minutes.
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Using direct reduced iron (DRI) from the Fastmet process and using rotary hearth furnace (RHF) technology, as a partial substitute of pellets in a blast furnace (BF), showed beneficial effects in terms of emissions reduction and energy consumption (Helle et al. 2012).
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