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US4070180A

Passivation of sponge iron by a mild reoxidation thereof is effected by contact at a temperature of 200 to 600 F with a gaseous atmosphere consisting essentially of 25 to 80% H 2 15 to 70% CO and 0 5% to 4 0% O 2 for a time in excess of about 1 hour The passivation atmosphere may be produced by dilution of a free-oxygen-containing gas with conventional reducing gases

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MIDREX Processes

reduces iron ore using a reforming gas made from natural gas The DRI is used mainly as the raw material for electric arc furnaces (EAFs) as a clean iron source substitute for scrap iron Pores are left behind in the DRI after oxygen has been removed These pores if filled with water for example can cause the iron to reoxidize with

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PRE

Balance capacity to be installed commissioned 1 Sponge Iron 0 4 MTPA2 0 MTPA 1 0 MTPA 0 6 MTPA 2 Captive Power Plant Co-generation Power Plant (WHRB) 100 MW 47 MW 20 MW 33 MW Coal based power plant 187 5 MW 162 5 MW 25 MW 0 BF gas based power plant 20 MW 0 0 20 MW TOTAL 307 5 MW 209 5 MW 45 MW 53 MW 3 Ingots/Billets/Bloom

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Energy survey of the coal based sponge iron industry

Sponge iron is a metallic mass with honeycomb structure It is produced by direct reduction of iron ore in the presence of coal and air Since last few years sponge iron has emerged as an alternate raw material for steel making The Indian Government has recognized sponge iron as

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Sponge Iron Gypsum Stones Crusher

Laboratory sponge stone crusher made in europe dynolitesborns laboratory jaw crushers are available in 6 sizes belt conveyor for sand processing price list material balance of gas based sponge ironaboratory sponge stone crusher made in europe marshall crusher indiaind here stone crusher manufacturers suppliers

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Waste Heat Recovery Steam Generator in Sponge Iron Plant

Engineering NIT It is proposed in this project to effectively utilize the A tremendous amount of heat is generated in the coal waste flue gas generated from rotary kilns to produce based sponge iron plant and a significant part of this heat electricity because this waste flue gas generated from associated with the waste gas can be unutilized

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rotary kiln process of making sponge iron

Coal The most critical raw material for sponge iron making Sponge iron making is a process in which iron ore lumps for a rotary kiln coal based sponge iron manufacturing process to be successful it is absolutely 8122424015 9788122424010 Advances Rotary Kiln Sponge Iron Plant Role of Coal in Rotary Kiln Sponge Iron Making Process 6 Quantity of Protective Char 7

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Research Article

of hematite to iron metal methane reforming and water gas shift reaction are taken into account in the model 2 ReactorModeling Iron ore reactor is a moving bed reactor to produce sponge iron product from iron ore Gas and solid phases are passed in counter current In general sponge ore reactor is divided

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DESIGN OF WASTE HEAT RECOVERY SYSTEM IN A

(DRI) Sponge iron is produced primarily both by using non-coking coal and natural gas as reductant and therefore classified as coal based and gas based process respectively Due to a promising availability of coal the coal based sponge iron plants share the major amount of its production

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gas based sponge iron plant using magnetite ore

gas based sponge iron plant using magnetite ore Iron and Steel From Cradle to Crown - scienceandculture-isna in the area of iron and steel making including production of pig iron in low shaft furnace sponge iron making in depleted magnetite the other important oxide ore is getting

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Grasim Industries History

- A letter of intent was received to set up a gas-based sponge iron project with an installed capacity of 6 lakh tonnes per annum in the Raigad District of Maharashtra - Approval from Government was received for setting up a project for the manufacture of colour T V glass shells in foreign technical collaboration with the Asahi Glass Company Ltd Japan

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Energy Audit Methodology of Sponge Iron Manufacturing

Conducting complete energy audit (both process and utility) of a sponge iron unit is challenging as there is no laid down procedure to audit the process side Further the average heat to power ratio (kW th /kW e ) of sponge iron plants ranges from (25 1) to (31 1) This shows that the manufacturing process mostly uses thermal energy and application of electrical energy is insignificant

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Mathematical Modeling of the Melting of Sponge Iron in a

The main raw material in the Electric Arc Furnace (EAF) is scrap This material has the advantage of lower energy consumption in comparison with Direct Reduced Iron (DRI) but the production of high quality steels with scrap is difficult due to the presence of residual elements and also due to severe fluctuations in both availability and price

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GAS CONTROL

The 235 Series Gas Purifier utilizes a bed of iron sponge as the active media for H 2 S removal The sponge consists of wood shavings impregnated with a hydrated form of iron oxide (Fe 2 O 3) The wood shavings serve only as a carrier for the iron oxide powder The sponge is loaded into the vessel and is supported on wooden pine trays

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Process for regenerating a reducing gas mixture from spent

Jan 07 1981A process for regenerating a reducing gas mixture from direct reduction furnaces for the production of sponge iron characterized by the steps of providing an arc heater having spaced electrodes and an arc chamber communicating with a gas reformation chamber striking an electric arc between the electrodes introducing an arc gas comprising a gaseous mixture of CO CO2 H2 and

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Sponge iron industry needs quick actions for survival

Oct 25 2013Sponge iron industry needs quick actions for survival The early plants came with a focus on high quality equipments high quality raw materials product quality and environmental considerations During this time the government also encouraged gas based sponge iron

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PRODUCTION OF IRON AND STEEL POWDERS

account for more than 90% of the world production of iron and steel powders viz the Hgans sponge-iron process and the water-atomizing process The former process is based on reduction of iron ore yielding a highly porous sponge-iron which subsequently is comminuted to powder The latter process is based on atomization of a stream of liquid

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Sponge Iron Process for Manned Space Exploration

Sponge iron process for manned space exploration Final project report June 2005 Prepared by Dr Simon Fraser Christian-Doppler Laboratory for Fuel Cell Systems Institute for Chemical Technology of Inorganic Materials Graz University of Technology Steyrergasse 21 A-8010 Graz Tel +43(0)316 873 8787 Fax +43(0)316 873 8782 simon fraserTUGraz at

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Process analytics in the Iron and Steel Industry

Direct reduction is a gas-based iron-making technology using natural gas instead of coke The natural gas reacts with CO 2 to CO and H 2 The CO then acts as reducing agent Smelt reduction technology is a coal-based iron making process Smelting reduction technology as the name clearly suggests involves both solid-state reduction and melting

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Material Balance Of Gas Based Sponge Iron

South Africa gas based sponge iron plant material balance of gas based sponge ironRotary Kiln Process of Making Sponge Get Price And Support Online south africa coal based sponge iron Processing material Manganese ore South Africa gas based sponge iron plant material balance of gas based sponge ironRotary Kiln Process of Making Sponge

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Cost

The most common forms of solid scavengers used for treating landfill gas are iron sponge and iron-based solid scavenger systems like Sulfur Rite and SulfaTreat The oldest commercial process for removing H 2 S is iron sponge which has been available for over 100 years Iron sponge consists of hydrated iron oxide impregnated onto redwood ships

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Conversion of Sponge Iron From Low Grade Iron ore And Mill

Conversion of Sponge Iron From Low Grade Iron ore And Mill Based on reduction kinetics process criterion for of the total steel rolling) is a expensive secondary material due to its high iron content low impurities and stable chemical composition The mill scale from the rolling process and all iron bearing wastes generated at the iron

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Melting of a new carbon –free waxed sponge iron in

electrode in the case of the new material melting comparing with that of normal sponge iron due to the reducing atmosphere gas for the iron ore The sponge iron produced by this process is carbon – free [1] Chamical analysis for balance and carbon – free sponge iron (using the same ore) Specification Balance Sample %

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brief process of coal based sponge iron rotary kiln

Customers want and that is our goal we produce ore crusher( brief process of coal based sponge iron rotary kiln) mill crusher mobile crushing plant processing equipment according to the specific needs of our design and production lines fully the interests of customers

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sponge iron process

Jul 29 2010Based on our experience an ideal coal based sponge iron plant shall have the following facilities As the manufacture of sponge iron is very sensitive to the physical and chemical characteristics of raw materials a well designed raw material preparation plant with crushing/screening facility for iron ore and coal to control the size of input materials to the kiln is a prime requiste

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Sponge Iron Consumption against Metallic Steel Scrap In

share of coal based sponge iron units in the production of sponge iron is 65%-70% and the balance is by gas based units This share is likely to increase further because of the restricted availability of gaseous reluctant in India Basically Sponge Iron manufacturing in India is predominately through coal based Sponge Iron Plants

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SPONGE IRON PRODUCTION IN ROTARY KILN PDF DOWNLOAD

Equivalent metallization — Carbon content in sponge iron at a given degree of metallization is important Raw material mix consisting of iron ore dolomite and non-coking coal is fed at the one end of the rotary kiln and is heated by coal burners to produce DRI

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How to Choose the Right Grate for Your Grill

Let's explore which grate material is best for your grill cast iron steel or porcelain Typically gas grills have either cast iron porcelain-coated cast iron stainless steel porcelain-coated steel or just plain steel The intense heat of the grill can wear down these metals if they are thin or poor quality

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Syngas

Syngas can be produced from many sources including natural gas coal biomass or virtually any hydrocarbon feedstock by reaction with steam (steam reforming) carbon dioxide (dry reforming) or oxygen (partial oxidation) Syngas is a crucial intermediate resource for production of hydrogen ammonia methanol and synthetic hydrocarbon fuels

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Is Limestone Used In The Production Of Sponge Iron

sponge iron production is a technique of purifying iron ore by reacting it with gas mixtures to remove oxygen via a reduction process iron ore from the coal based sponge iron process in africa limestone grinding plant use of fines for sponge iron production in coal based rotary kiln rotary kiln process of or sponge iron) a

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