rotary kiln direct reduction processes sl rn pdf

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sponge iron 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. Due to the inclination and rotation of Kiln the charge material moves along the length of Kiln where it is discharged continuously after ...

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Sponge Iron – Prakash Industries Limited

In the solid reduction process iron ore is converted into DRI in a rotary kiln fired by non-coking coal. Iron ore, coal and dolomite in pre-measured quantities are fed into the kiln, which is rotated at a speed of about 0.5 RPM. A temperature of 1,000 to 1,050 degrees is maintained through 70% of the kiln length towards the discharge end side for required reduction. The non-discharge end of ...

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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 .

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Direct Reduction Technologies | SAIL

SL/RN and Krupp-Codir are of rotary kiln type . These processes use solid reducing agents and operate in continuous flow. Ores for direct reduction have to meet stringent specifications with high percentage of Fe and low content of tramp elements. Pellets are used mainly for this purpose. The output of all DRI processes is Sponge Iron Sponge iron is also hot briquetted to .

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Simulation of Rotary Kiln Used in Sponge Iron Process ...

Rotary kiln is cylindrical in shape and is 80m long having 4.2m internal diameter. This is the reactor of the process where reduction as well as combustion reactions are carried out. The role of kiln is to convert the raw material (iron ore, coal and dolomite) into the sponge iron [8]. Detail reaction mechanism of the process is discussed below:

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Sponge Iron – Prakash Industries Limited

In the solid reduction process iron ore is converted into DRI in a rotary kiln fired by non-coking coal. Iron ore, coal and dolomite in pre-measured quantities are fed into the kiln, which is rotated at a speed of about 0.5 RPM. A temperature of 1,000 to 1,050 degrees is maintained through 70% of the kiln length towards the discharge end side for required reduction. The non .

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SL - RN (Iron Making Rotary Kiln Process for DRI ...

01.11.2015· (SL/RN) Stelco-Lurgi/Republic-National rotary kiln process

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Direct Reduction Process - an overview | .

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 ...

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(PDF) i) Direct Reduced Iron: Production

Direct reduction processes. ... Rotary kiln processes are SL/RN, ACCAR, KRUPP, CODIR, TDR, etc.; out of these, the SL/RN process is the . most common. The term SL/RN process stands for S .

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Simulation of Rotary Kiln Used in Sponge Iron Process ...

Rotary kiln is cylindrical in shape and is 80m long having 4.2m internal diameter. This is the reactor of the process where reduction as well as combustion reactions are carried out. The role of kiln is to convert the raw material (iron ore, coal and dolomite) into the sponge iron [8]. Detail reaction mechanism of the process is discussed below:

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rotary kiln for iron sand processing - .

SL/RN Process | Industrial Efficiency Technology & Measures. The process uses lump ore, pellets, beach sand or ilmenite ore and solid carbon to produce hot or cold DRI. ... (SL/RN) process is a widely used coal-based DRI-making process which uses a rotary kiln. ... Parent Process: Direct Reduced Iron. Read More. SL/RN Process | Industrial Efficiency Technology & Measures. The process .

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Coal based Direct Reduction Rotary Kiln Process – .

The process of direct reduction is carried out in a rotary kiln where the operating temperatures are maintained in a range from 1,000 deg C to 1,100 deg C. The product of the kiln (DRI and char mix) is then cooled in a rotary cooler with external water cooling system. The products of the kiln is screened and magnetically separated. DRI being magnetic gets attracted and gets separated from non ...

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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 ...

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Sponge Iron Production By Direct Reduction Slrn .

Sponge Iron Production By Direct Reduction Slrn Pdf. Direct Reduction Of Lateritic Nickel Ores In Rotary Kiln. Apr 29 2013 be used in the direct reduction of iron ores to produce a feed for steelmaking in the ferrochrome and in the calcining and prereduction of nickel laterites for the production of ferronickel nology over other technologies such as rotary kilns.

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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 .

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

Direct Reduced Iron (DRI) is used as an alternative feedstock in electric arc furnaces, making up 50% or more of the total iron charge. 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 .

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Present State of the Sl/Rn Process and Its .

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 energy. In connec-tion with the description of the SL/RN or Lurgi rotary ...

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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. 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 ...

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OPERATIONAL ASPECTS OF SPONGE IRON PRODUCTION IN A .

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.

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sl rn direct reduction process - BINQ Mining

Outotec – SL/RN direct reduction. SL/RN technology is a coal-based rotary kiln reduction process, where we have played a leading role and built over the years 32 SL/RN kilns, mainly in India and South . »More detailed. SL – RN, SL – RN process, SL – RN process characteristics – . Page up :Krupp method ( direct reduction in rotary kiln method) introduction, the development ...

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Optimization of air distribution in direct .

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 ...

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rotary kiln for iron sand processing - .

SL/RN Process | Industrial Efficiency Technology & Measures. The process uses lump ore, pellets, beach sand or ilmenite ore and solid carbon to produce hot or cold DRI. ... (SL/RN) process is a widely used coal-based DRI-making process which uses a rotary kiln. ... Parent Process: Direct Reduced Iron. Read More. SL/RN Process | Industrial Efficiency Technology & Measures. The process uses .

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iron ore rotary kiln - travisfaber

Sponge iron process uses a rotary kiln for the reduction ... The SL-RN process also uses rotary kiln for reducing iron ore. Inquire Now; Rotary kiln Wikipedia. A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. ... Iron ore pellets; Principle of operation· Inquire Now; Rotary Kiln Iron Ore weighbridges. Lateritic ...

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Coal-Based Dr Processes Using Rotary Kilns | .

Most of the established rotary kiln-based DR processes operate on the principle that the reduction is carried out exclusively by carbon monoxide obtained by the gasification of the fixed carbon content in coal. In the year 1991, SL/RN plants alone produced 0.83 million tons of Direct reduced iron (DRI), accounting for about 56% of the world's total production of coal-based DR processes, and ...

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OPERATIONAL ASPECTS OF SPONGE IRON PRODUCTION IN A ROTARY KILN

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.

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2G Direct Reduction - jfe-21st-cf.or.jp

The SL/RN process, which utilizes rotary kiln to reduce lump ore, pellets and sand iron with coal, is in commercial production. This process suffers, however, from relatively big heat loss and facility size, and hence finds limited acceptance of 2 million tons/year. A new attempt, called FASTMET process, mixes fine coal powder in green pellets, reduces the pellets by firing in .

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Direct Reduction of Iron Ore | SpringerLink

27.11.2014· In the search for a pure, available iron source, steelmakers are focusing their attention on Directly Reduced Iron (DRI). This material is produced by the reaction of a low gangue iron ore with a hydrocarbonaceous substance. Commercially, DRI is generated in four different reactors: shaft (moving-bed), rotary kiln, fluidized bed, and retort (fixed-bed).

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WELSPUN STEEL LIMITED

For the direct reduction of iron ore the main furnace used is rotary kiln. The rotary kiln is the refractory lined cylindrical vessel on which blowers are mounted & the air pipes, to provide combustion air to the inside of the kiln. During lite up there is a start up burner at the kiln discharge end which is oil fired to heat up the rotary kiln. To ignite the injected coal from outlet of the ...

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Rotary kiln - Wikipedia

A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process.Materials produced using rotary kilns include: Cement; Lime; Refractories; Metakaolin; Titanium dioxide; Alumina; Vermiculite; Iron ore pellets; They are also used for roasting a wide variety of sulfide ores prior to metal extraction.

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Direct Reduced Iron and its Production .

Metallization, reformed natural gas, residual elements, Rotary kiln, Direct Reduced Iron and its Production Processes. Direct reduced iron (DRI) is the product which is produced by the direct reduction of iron ore or other iron bearing materials in the solid state by using non-coking coal or natural gas. Processes which produce DRI by reduction of iron ore below the melting point of the iron ...

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