coal based rotary kiln sl rn process

SL/RN process -

In the standard SL/RN process, iron ore, coal, and dolomite or limestone as desulfurizing agent are charged into a rotary kiln and heated up by a countercurrent gas flow. Heat is generated by the controlled combustion of volatiles from the coal and surplus CO from the charge.

Some Studies on Energy Savings in Sponge Iron Plants

Aug 29, 2003 · Some Design Aspects of Pneumatic Coal Injector for Coal based Direct Reduction Process in Rotary Kiln,” Powder Handling and Processing Trans. Tech., 5 (2 ... “SL/RN Coal Based DR, Technology from Lurgi at ISCOR,” 1983, New Zealand Steel Times, 211(7), pp. 371–372. 15.

SL/RN Process | Industrial Efficiency Technology & Measures

HYL Direct Reduction Technology: Adaptations for the

Rotary kiln coal-based DR plants, based on single module, are designed for up to a maximum of 0.250 M tonnes per year (million tpy) of DRI, requiring high capital cost for larger capacities. When using ore fines and coal, gangue and sulfur stemming from coal is normally reflected in higher transformation costs in the steelmaking step.


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.

Case Studies in Thermal Engineering

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...

Rotary Kiln Iron Ore Pellet Process In South Africa

Coal based Direct Reduction Rotary Kiln Process IspatGuru. The main raw materials for the production of DRI by the rotary kiln process are (i) sized graded iron ore or iron ore pellets, (ii) non-coking coal, and (iii) dolomite in small quantities to scavenge the sulphur.

Coal based Direct Reduction Rotary Kiln Process - IspatGuru

Coal based Direct Reduction Rotary Kiln Process The coal based direct reduction rotary kiln process was developed for converting iron ore directly into metallic iron without the melting of the materials. The process has the advantage of low capital expenditure and no requirement of coking coal.

PDF 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.

process of iron reduction in tunel kin and rotary kiln

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. Operates with the widest range of ironbearing materials, such as pellets, lump ore, beach sand, ilmenite and also iron


The coal-based processes can be grouped into four categories according to their reduction reactors. The rotary kiln processes include ACCAR/OSIL, DRC, Krupp-CODIR and SL/RN processes. Kinglor Metor...


approximately 25% of DRI is produced in coal-based reductant processes. 2, one of which is the Stelco-Lurgi/Republic-National (SL/RN) rotary kiln process. In 2010, this process produced 2.5% of total DRI worldwide, primarily in India and secondly in South Africa (specifically at ArcelorMittal, Vanderbijlpark).

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

In the steel plant considered here, direct reduced iron (DRI), produced by the coal-based SL/RN process, makes up 50% or more of the total iron charge. SL/RN DRI samples from a kiln cooler had high nitrogen contents (50-250ppm, depending on particle size), contributing to elevated nitrogen levels in liquid steel produced in the EAFs.

Method for the direct reduction of iron using gas from coal

A few plants utilize coal as the source of reductant in rotary kiln processes, such as the SL/RN process, which directly react coal in-situ in the kiln without separately gasifying the coal to CO and H 2. The rotary kiln processes have an inherent coal utilization inefficiency in that approximately two-thirds of the coal is burned in the kiln to supply heat and only one-third is used to supply the reducing gas for direct …

Direct Reduction Process - an overview | ScienceDirect Topics

However in the coal/oil-based DR process, the reducing gas is generated from hydrocarbons (primarily coal, but sometimes oil and natural gas) in the reduction zone of the furnace, which is typically a rotary kiln. Typical examples of the coal-based process include the SL/RN and ACCAR processes. The coal-based DR process is more popular in India and China. Different types of reactors, such as shaft furnaces, fluidized beds, rotary kilns, …

Dryers - Outotec sl rn rotary kiln direct reduction

Coal Based Rotary Kiln Sl Rn Process OUTOTEC DIRECT REDUCTION AND SMELTING REDUCTION tional SLRN direct reduction plants based on a rotary kiln with noncoking coal as the reductant and fuel Design engineering delivery and services for SL RNXtra plants which use a bination of a prehardening grate and traditional SLRN kiln for the treatment of iron ore fines

Emerging Technologies for Iron and Steelmaking

Coal based Direct Reduction Rotary Kiln Process – IspatGuru

Fig 1 Cross section of rotary kiln. Coal based direct reduction process is based on the solid reducing agent which is non-coking coal. The reaction takes place at high temp (1000 deg C to 1100 deg C). Coal plays a dual role in the kiln. Part of coal is used as fuel to supply the desired heat so as to take the raw materials to the desired temperature.


The coal-based processes can be grouped into four categories according to their reduction reactors. The rotary kiln processes include ACCAR/OSIL, DRC, Krupp-CODIR and SL/RN processes. Kinglor Metor...


erection. The SL-RN process also uses rotary kiln for reducing iron ore. The plant, as shown in Fig. 2, essentially consists of raw material handling and preparation systems, rotary kiln with heat-ing arrangements for reduction of iron oxide, kiln for cooling the reduced material and the facilities for separating sponge iron from char

Mathematical modeling of pneumatic char injection in a direct

Abstract. 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.

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).


KURT MEYER. Lurgi Chemie and Huttentechnik GmbH., Frankfurt, West Germany. Abstract The paper describes the present state of development of the SL/RN Process, discussing the reasons for using solid fuels as reductants and the application of a rotary kiln as reactor. Especially critical thought is given to the problem of economy ,of the direct reduction processes with regard to the prices of ore, coal and …

Direct Reduction Combustion Technology |

SL/RN – The SL/RN coal-based process also uses a rotary kiln inclined at 3-4% of horizontal. All the coal feed is introduced at the upper end of the kiln to ensure a uniform temperature distribution along the length of the reduction zone, and to ensure that combustion takes place at the bed surface.

Prakash Industries Limited, Bilaspur - Manufacturer of

The technology is coal based and the waste gases of the Rotary Kilns are utilized for generation of power in Power Cogeneration plant. The whole process of manufacturing Sponge iron ( DRI) is environment friendly with provision of pollution control equipments at all the required stages along with the concept of 100% reutilization of the waste water .

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