coal based rotary kiln sl rn process

Emerging Technologies for Iron and Steelmaking

Several processes based upon the direct reaction of coal and iron ore in a rotary kiln, such as the SL/RN process, have reached various stages of development since the 1960s. 20 Due to the high gangue and low specific productivity of these processes, they have not received a great deal of attention for commercial production. Several processes ...

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

DRI produced with coal based reductants (for example in rotary kilns) make up roughly 25% of DRI produced in the world. It was found that SL/RN DRI samples from a kiln cooler had high nitrogen contents (50-250ppm, depending on particle size), higher than DRI from gas-based reduction. The higher nitrogen content of SL/RN DRI would increase the

Mathematical modeling of pneumatic char injection in a ...

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. The model is based on material and energy conservation principles, and the ...

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 been found to have a definite pattern with small changes due to variation in process conditions.

Subhas Behera - President - PUSHPIT STEEL PRIVATE LIMITED ...

About. 32years of experience in Sponge Iron, Steel and Power Industry. Coal based Rotary Kiln Process for DRI (Sponge Iron) making is the speciality as success in return. Product development with best economy. Power Generation though Waste Heat and Varied Fuels. Proven and safe practices to achieve best PLF is always in top strategy list.

Prospects for Coal-based Direct Reduction Process

Most coal-based 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). As a result, the

SL/RN Process » Bisotoun Steel Co.

SL/RN Process. 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.The advantage of this technology is its robustness and the potential to use ...

SL/RN process - Outotec

The SL/RN process was developed in the early 1960s by Outotec in collaboration with three US companies. Benefits 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.

SL/RN | Middle East Steel Industry

Investment and operational costs of the process are reported to be $344.4 and $183.1 per ton of steel, based on a scrap cost of $120/t-scrap (US DOE, 2003. p. 4/4.) Commercial: Waste Heat Recovery for Rotary Kiln Direct Reduction: The coal consumption is about 800 kg/t DRI.

Outotec Sl Rn Rotary Kiln Direct Reduction Technology

The basic principle of the SLRN process was used on numerous rotary kiln plants and still represents the dominant technology for the direct reduction of lump ore or pellets using coal as the reducing agent In the traditional SLRN process iron ore. View Details Send Enquiry Sl Rn Natural Gas Based Rotary Kiln

Rotary Kiln with SL/RN Process - Electrotherm E&T

Rotary Kiln with SL/RN Process. Coal Based Rotary Kiln for Direct Reduced Iron / Sponge Iron (100 TPD, 350 TPD, and 500 TPD) Solid-state reduction of Iron Ore using either coal/gas as a medium of reduction to produce a substitute raw material for steel making is termed as Direct Reduced Iron (DRI). Since DRI is produced by removing oxygen from ...

sponge iron process

2.0 DESCRIPTION OF PROCESS: Flow chart of SL/RN process has been shown in fig. 1.Sized Iron Ore and Non Coking Coal along with Dolomite are fed continuously to the charge end of Rotary Kiln inclined at 2.5%. Coal is also injected through an Injection Pipe at the discharge end of Kiln.

THE EFFECT OF REDUCTION TIME AND SIZE DISTRIBUTION OF ...

The basic principle of the SL/RN process was used on numerous rotary kiln plants and still represents the dominant technology for the direct reduction of lump ore or pellets using coal as the reducing agent (). In the traditional SL/RN process, iron ore, coal…

(PDF) Operation of Coal-Based Sponge Iron Rotary Kiln to ...

Operation of Coal-Based Sponge Iron Rotary Kiln to Reduce Accretion Formation and Optimize Quality and Power Generation. ... and highly reducible pellets are most suitable for the SL/RN process ...

Coal based Direct Reduction Rotary Kiln Process – IspatGuru

Rotary kiln – It is the heart of the coal based reduction process since the reduction reaction takes place in this reactor. The diameter and the length of the kiln depend on its capacity. The kiln is generally lined with high alumina castable refractories throughout its length with dams at feed end and discharge end.

PRESENT STATE OF THE SL / RN PROCESS AND ITS …

101 t OF COAL PERCENTAGE CONSbmPTION % EOUPALENT UP TO THE YEAR 2000 y. 93 Fig. 1 TYPE OF PALS AND RESERVES 3 93 OAS RESOURCES AND CONSUMPTION IN USA Fig. 2 Fig. 3 4. Description of a few SL/RN and Lurgi. rotary kiln plants. 5. Discussion on some problems. 6. The future of the SL/RN Process and its application td Indian raw Materials. 1.

BHAGWATI POWER & STEEL LIMITED

SL/RN Process, useful when coal of low ash & sulphur content available ROTARY KILN Process, the most widely accepted process. The ITC Technology which has experience in operation of smaller plants using the wide range of raw materials from different sources like iron ores from Ballery-Hospet region, Bailadilla, Barbil etc.

WELSPUN STEEL LIMITED

The process of sponge iron making aims to remove the oxygen from iron ore. The quality of sponge iron is primarily ascertained by the percentage of metallization (removal of oxygen), which is the ratio of metallic iron to the total iron present in the product. ... SL/RN technology is a coal based rotary kiln direct reduction process : Process ...

SL/RN Process | Industrial Efficiency Technology & Measures

SL/RN Process. 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.

V. VENKATESWARAN

influence of important process variable as ths suc type he of coal, ore, degree of reduction, throughpu etct ha.s been examined and prediction made regardins thge operation of large commercial SL/RN kiln fos spongr e iro productionn .

SL/RN | Downstream Consulting Pty Ltd

The process is coal based and works at high temperature and near atmospheric pressure. The iron oxide combined with coal (usually low cost non-coking coal) and fluxes is fed to the elevated end of the SL/RN rotary kiln. The kiln is divided into 2 sections, the feed end is the preheat zone and the discharge end the for reduction.

Coal Mill In Syria Production Process - Microsoft Bing Search

Rotary Kiln with SL/RN Process. Coal Based Rotary Kiln for Direct Reduced Iron / Sponge Iron (100 TPD, 350 TPD, and 500 TPD) Solidstate reduction of Iron Ore using either coal/gas as a medium of reduction to produce a substitute raw material …

OPERATIONAL ASPECTS OF SPONGE IRON PRODUCTION …

amalgamation which, in 1964, led to SL-RN process, For the development of the process upto the present state, three pilot plants have been erect-ed and operated and several commercial plants are already in operation or are in the state of erection. The SL-RN process also uses rotary kiln for reducing iron ore. The plant, as shown in Fig.

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

The SL/RN DRI samples from a kiln cooler had high nitrogen contents (50–250 ppm, depending on particle size), contributing to elevated nitrogen levels in liquid steel produced in the electric arc furnaces.

Direct Reduced Iron and its Production Processes – IspatGuru

The coal based rotary kiln process combines the Republic Steel-National Lead (RN) process developed in 1920s for beneficiating low grade ores, and the Stelco-Lurgi (SL) process conceived in the early 1960s for producing high-grade DRI.

Energy survey of the coal based sponge iron industry ...

The actual process of the coal based sponge iron production is based on SL/RN process (jointly developed by the Steel Company of Canada, Lurgi Chemie, Republic Steel Company and National Lead Corporation in 1964), which works on direct reduction of ore.This process is adopted by worldwide conventional sponge iron industries.

Direct and smelting reduction - Outotec

Design, engineering, delivery, and services for traditional 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 grate and traditional SL/RN kiln for the treatment of iron ore fines.

Recovery and utilization of waste heat in a coal based ...

2. Coal-based sponge iron process The process of the direct reduction of haematite in a rotary kiln is schematically described in the Fig. 1. Haematite and non-coking coal are fed to the kiln at controlled rates without pre-mixing and the charge moves through the kiln depending upon the rotation speed and inclination of the kiln.