fluidised bed reduction of o ides ore

US2921848A - Fluidized-bed reduction of ore - Google

Fluidized-bed reduction of ore Download PDF Info Publication number US2921848A. US2921848A US697910A US69791057A US2921848A US 2921848 A US2921848 A US 2921848A US 697910 A US697910 A US 697910A US 69791057 A US69791057 A US 69791057A US 2921848 A US2921848 A US 2921848A Authority US United States Prior art keywords gas primary reducing exit fines Prior art

Get PriceEmail contact

Direct Reduction of Iron-Ore in Fluidized Beds - ScienceDirect

01/01/2018  In other cases, such as the smelting reduction (SR) processes that use the fluidized bed technologies the iron-ore fines can directly be charged into the reduction process making it highly advantageous. Such fluidized bed reactors are used in the pre-reduction stage of the FINEX® process (Habermann et al., 2000).

Get PriceEmail contact

(PDF) Direct Reduction of Iron-Ore in Fluidized Beds

01/11/2020  In this work the reduction kinetics of hematite fine iron ore was studied for industrial-scale processes using the fluidized bed technology. Especially designed batch tests were performed in a ...

Get PriceEmail contact

Reduction of fine iron ore via a two-step fluidized bed ...

01/03/2014  Therefore, a two-step fluidized bed DR process for fine iron ore is proposed, and it includes the following two steps: (1) constructing the noncohesive DRI c particles by H 2 –CO mixture at the temperature lower than 600–675 °C, where the carbon precipitation reaction is dominant, and (2) further reducing the noncohesive DRI c particles at the temperature higher than about 800 °C, where ...

Get PriceEmail contact

Applications of fluidized bed technology in processes ...

01/01/2013  Examples of the additional applications of fluidized bed technology presented are: fluid catalytic cracking (FCC), the reduction of iron ores, flue gas cleaning, the production of melamine and titanium oxide, the roasting of sulfide ores, and the drying of coal. A general overview of each process is presented, with a particular emphasis on the utilization of the fluidized bed reactor within ...

Get PriceEmail contact

Fluidized bed reduction of laterite fines with reducing ...

U.S. Pat. No. 4,224,056 describes a process for the reduction of iron ore fines with a fluidized bed, wherein the ore is reduced simultaneously with the reducing gas production, i.e., generated in situ. The carbon-bearing particles are fluidized with the fluidizing gas to form a bed of carbon-bearing particles in the reactor. The iron ores can be in various forms, including dust. Iron appears ...

Get PriceEmail contact

Fluidization behavior and reducibility of iron ore fines ...

01/10/2020  Some of these processes are based on fluidized bed technologies that have the additional advantage of directly using iron ore fines without prior agglomeration (Schenk, 2011). An example of a smelting reduction process using the fluidized bed technology for pre-reduction on an industrial scale is the Finex® process (Thaler et al., 2012).

Get PriceEmail contact

Prevention of agglomeration/defluidization in fluidized ...

01/06/2013  For fluidized-bed reduction of iron ore, the sticking occurred mostly during metallization of ore and was controlled by a combination of several factors such as iron morphology, surface energy of iron, and external shape of ores , , . Some ore particles were precipitated by the metal iron with the fibrous shape on the particle surface. The sticking was initiated by the contact of the needles ...

Get PriceEmail contact

Applications of fluidized bed technology in processes ...

01/01/2013  Examples of the additional applications of fluidized bed technology presented are: fluid catalytic cracking (FCC), the reduction of iron ores, flue gas cleaning, the production of melamine and titanium oxide, the roasting of sulfide ores, and the drying of coal. A general overview of each process is presented, with a particular emphasis on the utilization of the fluidized bed reactor within ...

Get PriceEmail contact

Iron Ore Reduction in a Laboratory-scale Fluidized Bed ...

Iron Ore Reduction in a Laboratory-scale Fluidized Bed Reactor —Effect of Pre-reduction on Final Reduction Degree A. THURNHOFER, M. SCHACHINGER, F. WINTER, H. MALI1) and J. L. SCHENK2) Christian Doppler Laboratory for Chemical Engineering at High Temperatures, Getreidemarkt 9/166, A-1060 Vienna, Austria. E-mail: [email protected] 1) Department of Geological Sciences,

Get PriceEmail contact

Fluidization behavior and reducibility of iron ore fines ...

01/10/2020  Some of these processes are based on fluidized bed technologies that have the additional advantage of directly using iron ore fines without prior agglomeration (Schenk, 2011). An example of a smelting reduction process using the fluidized bed technology for pre-reduction on an industrial scale is the Finex® process (Thaler et al., 2012).

Get PriceEmail contact

Fluidized bed reduction of laterite fines with reducing ...

U.S. Pat. No. 4,224,056 describes a process for the reduction of iron ore fines with a fluidized bed, wherein the ore is reduced simultaneously with the reducing gas production, i.e., generated in situ. The carbon-bearing particles are fluidized with the fluidizing gas to form a bed of carbon-bearing particles in the reactor. The iron ores can be in various forms, including dust. Iron appears ...

Get PriceEmail contact

Reduction of fine iron ore via a two-step fluidized bed ...

In T. Zhang's study, 142) a fluidized bed direct reduction process for fine iron ore is proposed, and it contains two steps: (1) constructing the direct reduction particles by H 2 -CO mixture at ...

Get PriceEmail contact

An Experimental Study on the Kinetics of Fluidized Bed ...

To optimize existing iron ore reduction processes or to develop new ones, it is necessary to know the reduction kinetics of the iron ore of interest under the relevant operating conditions. In this work the reduction kinetics of hematite fine iron ore was studied for industrial-scale processes using the fluidized bed technology. Especially designed batch tests were performed in a laboratory ...

Get PriceEmail contact

Influence of MgO Additive on Fluidized Bed Reduction

Influence of mixing MgO additive on fluidized bed reduction of iron ore fines using simulate COREX reducing gas was investigated. Experiments were conducted at 1073 K in a visualization fluidized bed. Mixing MgO additive was carried out using powder method and solution method. It was found that mixing MgO into ore fines using solution method could increase fluidization time from 12 to 80 ...

Get PriceEmail contact

Reduction of Iron Oxides with Hydrogen—A Review ...

During the iron oxide reduction in a fluidized bed, the formation of iron whiskers should be avoided. Whisker formation is one of the main reasons for sticking phenomena, which leads to defluidization of the material in the reactor. 58 - 60 The formation of dense iron layers around the particles should also be avoided because the layer can act as a barrier for the reducing gas.

Get PriceEmail contact

Reduction Behavior lron Ore Fines and Circulation Characteris-

ISIJ International, Vol. 33 (1 993), No. 12, pp, 121 1-1219 Reduction Behavior ot lron Ore Fines and Circulation tics of Fines in Prereduction Fluidized Bed Characteris-Tatsuro ARIYAMA.1)Shinichi ...

Get PriceEmail contact

Reduction of iron oxides by carbon in a circulating ...

gaseous reduction of iron ores in bubbling fluidized beds was analyzed in an earlier study [12]. In this work, a theoretical analysis of the reduction of iron oxides by carbon in a CFB is considered. 2. Circulating fluidized bed reactors During the last 20 years, interest in fluidization regimes other than the conventional bubbling bed has ...

Get PriceEmail contact

An Experimental Study on the Kinetics of Fluidized Bed ...

To optimize existing iron ore reduction processes or to develop new ones, it is necessary to know the reduction kinetics of the iron ore of interest under the relevant operating conditions. In this work the reduction kinetics of hematite fine iron ore was studied for industrial-scale processes using the fluidized bed technology. Especially designed batch tests were performed in a laboratory ...

Get PriceEmail contact

Effect of Coating MgO on Sticking Behavior during ...

Fluidized bed reduction of iron ore fines is typically inhibited by the onset of “sticking” at temperatures above 973 K, which leads to particle agglomeration and defluidization of the bed ...

Get PriceEmail contact

STUDIES ON FLUIDIZED BED TECHNOLOGY FOR TREATMENT

2.2 Manganese Ore as Bed Material 9 2.3 Utilization of Manganese Ore 10 2.4 Composition of Natural Manganese Ore 10 Chapter 3- Experimental Setup and Procedure 12-20 3.1 Experimental Setup for Fluidized Bed Reactor 13 3.2 Sulphur Dioxide Production 14 3.2.1 Experimental Setup 14 3.2.2 Procedure 14 3.3 Materials and Methods 15 3.3.1 Material Preparation 15 3.3.2 Characteristics of Bed

Get PriceEmail contact

Influence of MgO Additive on Fluidized Bed Reduction

Influence of mixing MgO additive on fluidized bed reduction of iron ore fines using simulate COREX reducing gas was investigated. Experiments were conducted at 1073 K in a visualization fluidized bed. Mixing MgO additive was carried out using powder method and solution method. It was found that mixing MgO into ore fines using solution method could increase fluidization time from 12 to 80 ...

Get PriceEmail contact

Reduction of Molten Iron Oxide and FeO Bearing Slags by H2 ...

of the pre-reduced iron ore obtained by fluidized bed reduction,23) because the plasma furnace is suitable to melt continuously such powdered material and to complete final reduction of iron oxides accompanied in the pre-reduced ore. Present investigation is to study the feasibility of such process, where studies were made on reduction of iron oxide and Fe0 bearing slag (usually ac-companied ...

Get PriceEmail contact

Direct reduced iron - Wikipedia

The direct reduction process uses pelletized iron ore or natural "lump" ore. One exception is the fluidized bed process which requires sized iron ore particles. The direct reduction process can use natural gas contaminated with inert gases, avoiding the need to remove these gases for other use. However, any inert gas contamination of the reducing gas lowers the effect (quality) of that gas ...

Get PriceEmail contact

Direct Reduction Behaviors of Titanomagnetite Ore by ...

Experimental Procedures of Gas Reduction in the Fluidized Bed. SA TTM raw ore with main particle size 120–140 mesh (average 0.115 mm) were dried for 6 hours at 383 K for standby. Every experiment used 10 g SA TTM raw ore as reduction material. The experimental apparatus is shown in Fig. 2. The cylinder reactor was designed as a bubbling fluidized bed, 13) consisting of a transparent silica ...

Get PriceEmail contact

4.11 Chemistry of nitrogen oxides at atmospheric fluidized ...

nitric oxide by air staging, and reduction of nitric oxide with char. In circulating fluidized bed combustion, significant amounts of char are present everywhere in the furnace, and the efficient interaction between nitric oxide and char is possible in the whole reactor volume. With air staging the amount of char in the furnace increases even more. Describing the formation and decomposition of ...

Get PriceEmail contact

Copyright © 2020.Company name All rights reserved.SiteMap