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rotary kiln direct reduction processes sl rn pdf

  • 11Ashrafian.pdf | Iron | Industries

    The third method is SL/RN direct reduction, which is coal-based rotary kiln reduction process. This is used mainly in India and South Africa. In this method the feed is preheated up to 1800°F

  • (PDF) New Concept of Hot Metal Production using Rotary ...

    The new concept of process technology, which is proposed in this paper (patent pending) to produce hot metal / pig iron. is the combination of rotary kiln and lower part of blast furnace (smelting ...

  • Rotary Kilns - fikcc.com

    10.7 Mineral Ore Reduction Processes in Rotary Kilns 280 10.7.1 The Rotary Kiln SL/RN Process 280 10.7.2 Roasting of Titaniferous Materials 282 10.8 The Rotary Kiln Lightweight Aggregate Making Process 285 10.8.1 LWA Raw Material Characterization 288 10.8.2 LWA Feedstock Mineralogy 289 10.8.3 LWA Thermal History 290 Appendix 297 Index 339. This page intentionally left blank. Foreword …

  • Rotary Kilns | ScienceDirect

    We start with the cement and lime processes and then move on to describe some of the carbothermic reduction processes that employ the rotary kiln as the primary device where we examine two processes, iron ore reduction (the SL/RN (acronym for steel-making companies Stelco, Lurgi, and Republic National) process) and ilmenite ore reduction (the Becher process). We then examine the …

  • Mathematical model of the SL/RN direct reduction process

    Mathematical Model of the SL/RN Direct Reduction Process V. VENKATESWARAN AND J. K. BRIMACOMBE A mathematical modelhas been developed to predict the operating behavior of an SL/RN directreduction kiln from a knowledge of the main process variables. The model is basedon steady state principles and is capable of quantitatively describing the different chemical reactions in the kiln such …

  • Mathematical Modeling of Pneumatic Char Injection in a ...

    Mathematical Modeling of Pneumatic Char Injection in a Direct Reduction Rotary Kiln V. RAMAKRISHNAN and P.S.T. SAI A one-dimensional steady-state mathematical model is proposed for direct reduction process in rotary kilns akin to the SL/RN process. The model takes into account pneumatic coal char injection from the discharge end of the kiln to supplement the heat availability. …

  • Nitrogen in SL/RN direct reduced iron: origin and effect ...

    Since the SL/RN process is a solid state reduction process, with solid carbon as reductant, little carbon dissolves in the sponge iron. The carbon content of DRI produced at the plant considered in this work is <0·15%C, 7 Strohmeier B , Peters W : Metall. Ital. , 1988 , 80, (11), 849–859, 892 .

  • OUTOTEC DIRECT REDUCTION AND SMELTING REDUCTION

    direct reduction process, including laboratory and pilot plant programs. Our direct reduction offering covers: • Design, engineering, delivery, and services for tradi-tional SL/RN direct reduction plants based on a rotary kiln, with non-coking coal as the reductant and fuel. • Design, engineering, delivery, and services for SL/ RN-Xtra plants, which use a combination of a pre-hardening ...

  • THE FUTURE OF DIRECT REDUCTION PROCESSES M. N. DASTUR, …

    (1) The rotary kiln installations at Skopje and Inchon are not operating at present. (2) Calculated on the basis of 540,000 tons installed hot metal capacity and usage of about 2.5 tons iron per ton iron and 30-35 per cent degree of reduction in the rotary kiln.

  • SL/RN process - Outotec

    The SL/RN process was developed in the early 1960s by Outotec in collaboration with three US companies. The process principles are the basis for numerous rotary kiln plants and still represent the dominant technology for the direct reduction of lump ore or pellets using coal.

  • NITROGEN IN SL/RN DIRECT REDUCED IRON: ORIGIN AND …

    SL/RN DRI is one where nitrogen present within the atmosphere of the rotary cooler (where hot DRI, discharged at 1000°C from the rotary kiln, is cooled to approximately 100 °C in ca. two hours) penetrates the solids bed and nitrides DRI

  • Rotary Kilns - 1st Edition - Elsevier

    Lime Making Limestone Dissociation (Calcination) The rotary Lime Kiln The Cement Making Process The Cement Process chemistry Rotary Cement Kiln Energy Usage Mineral Ore Reduction Processes in Rotary Kilns The Rotary Kiln SL/RN Process Roasting of Titaniferous Materials The Rotary Kiln Lightweight Aggregate Making Process Raw Material Characterization Mineralogy Thermal History …

  • SL/RN Process | Industrial Efficiency Technology & Measures

    The so-called Stelco-Lurgi/Republic Steel-National Lead (SL/RN) process is a widely used coal-based DRI-making process which uses a rotary kiln. The process uses lump ore, pellets, beach sand or ilmenite ore and solid carbon to produce hot or cold DRI. The process operates at high temperature and atmospheric pressure.

  • SL/RN | Downstream Consulting Pty Ltd

    The SL/RN process is a kiln based direct reduction process which produces hot or cold DRI from lump, pellets, fines (including iron sands and ilmenite ore). The process is coal based and works at high temperature and near atmospheric pressure.

  • Ironmaking Proceedings St. Louis 1976 - New SL/RN Direct ...

    The construction of the new SL/RN direct reduction kiln at Grif fith Mine in northern Ontario is : ... Pellets - The SL/RN kiln will process 550 000 NT of oxide pellets per year, about one-third of the mine's production, These pellets are fully indurated and have an iron content of about 67 percent. A typical analysis is given in Table I. Table I: Composition of Griffith Pellets Coal - The ...

  • Mathematical model of the SL/RN direct reduction process ...

    A mathematical model has been developed to predict the operating behavior of an SL/RN direct reduction kiln from a knowledge of the main process variables.

  • PRESENT STATE OF THE SL / RN PROCESS AND ITS APPLICATION ...

    critical thought is given to the problem of economy ,of the direct reduction processes with regard to the prices of ore, coal and energy. In connection with the description of the SL/RN or Lurgi rotary kiln

  • Direct Reduced Iron | Industrial Efficiency Technology ...

    Waste Heat Recovery for Rotary Kiln Direct Reduction The coal consumption is about 800 kg/t DRI. Significant CO 2 and particulate matter emissions are the limitations of the process.

  • Coal based Direct Reduction Rotary Kiln Process ...

    Since the rotary kiln process requires around 7 hours to 8 hours of reduction time, the productivity of the process is limited and is usually in a range between 30,000 tons/year to 150,000 tons/year depending on the kiln size. Important stages of the process and the process …

  • The SL/RN Process For Production Metallized Burden

    The SL/RN Process For Production of Metallized Burden by Kurt Meyer, Giinter Heitmann, ... Fig. 1-Flowsheet of a SL/RN direct reduction plant with anthracite or coke as reducing agent. 0 5 10 15 20 25 30 35 FEED EN3 DISTANCE FROM FEED EN) (m) DISCHARGE END Fig. 2-Typical temperature profile in SL/RN kiln. 24 Ironmaking Conference Proceedings, 1965 In the course of the extensive de- …

  • Nitrogen in SL/RN Direct Reduced Iron: Origin and Effect ...

    Keywords: SL/RN, Rotary Kiln, Direct Reduced Iron, Nitrogen Control, Electric Steelmaking Introduction Direct reduced iron (DRI) has become a valuable feedstock to the electric arc furnace (EAF).

  • Rotary kiln - Wikipedia

    General layout of a direct fired countercurrent rotary kiln used in cement manufacture Rotary kiln body, with drive gear and 2 tyres (riding rings) A rotary kiln is a pyroprocessing device used to raise materials to a high temperature ( calcination ) in a continuous process.

  • Optimization of air distribution in direct reduction ...

    An algorithm for optimization of the air distribution in direct reduction process in rotary kilns akin to the SL/RN process is proposed, based on Pontryagin's continuous maximum principle. The optimum air distribution has been obtained for given operating conditions. The optimum air distribution has

  • SL - RN (Iron Making Rotary Kiln Process for DRI Production)

    2015-10-31· (SL/RN) Stelco-Lurgi/Republic-National rotary kiln process.

  • Prospects for Coal-based Direct Reduction Process

    Prospects for Coal-based Direct Reduction Process Haruyasu MICHISHITA*1, ... reduction processes including SL/RN2) employ rotary kilns. Pellets, or lump-ore, mixed with coal are/is charged into the rotary kilns2) and heated by coal burners to produce DRI. To avoid the significant formation of the kiln rings, their operating temperatures must be maintained in a range from 1,000 to 1,100℃3 ...

  • coal based lurgi dri process flow chart - Cutting Head

    The so-called Stelco-Lurgi/Republic Steel-National Lead (SL/RN) process is a widely used coal-based DRI-making process which uses a rotary kiln. The process uses lump ore, pellets, beach sand or ilmenite ore and solid carbon to produce hot or cold DRI. The process …

  • rotary kiln process for 350 tpd sponge iron lurgi technology

    In this project some sections of sponge iron making process were simulated. ... 7 CHAPTER 02 LITERATURE REVIEW 8 In Sponge Iron industry Rotary kiln is the .... in bringing SL/RN technology of sponge iron making to our country with LURGI .... CPT for Sponge iron lies between 200 to 350 o C. Lower the CTP easier for...

  • coal based rotary kiln sl rn process – Crusher Machine For ...

    SL – RN, SL – RN process, SL – RN process characteristics – … SL – RN process in converter, cooling … material for production of direct reduced iron by direct reduction process with rotary kiln.

  • STATE OF THE DIRECT REDUCTION AND REDUCTION SMELTING PROCESSES

    processes (non-coke metallurgy, direct reduction, direct processes). This paper represents a survey of the most relevant processes from this domain by the end of 2000, which display a constant increase in the modern process metallurgy.