The best option is to convert the iron ore and coal/coke fines into cold bonded iron ore-coal composite pellets/briquettes. By producing composite pellets/briquettes from iron ore and coal/coke fines, utilization of these fines also takes place.
Carbon-containing pellets were prepared with the carbonized product of agricultural wastes and iron concentrate, and an experimental study on the direct reduction was carried out. The experimental results demonstrated that carbon-containing pellets could be rapidly reduced at 1200 to 1300°C in 15 minutes, and the proper holding time at high temperature was 15 to 20 min.
The effects of coal and iron oxide properties on the reaction behavior of carbon composite iron ore briquettes were investigated at the temperatures of 1273-1473K in N 2 atmosphere. Four kinds of carbon composite iron briquettes were prepared in combination with two iron ores (hematite ore, magnetite ore) and two coals (high fluidity coal, low fluidity coal).
the reduction behavior of the iron ore–coal composites at elevating temperature was examined under inert gas ﬂow. Below 1200K, the reduction of iron oxide in Marra Mamba ore–coal and pisolite ore–coal composites pro-ceeded faster than that in hematite ore–coal composite. It can be attributed to the larger speciﬁc surface
Nov 01, 2017· Particularly, the understanding of the reduction behavior of iron ore/biomass composite pellets in the DRI route would be beneficial to the industrial implementation in producing DRI by using biomass including the biomass additive agents and simulated biomass-derived syngas. 2. Materials and methods 2.1. Materials
on the production of porous iron based on the swelling phe-nomenon of the iron ore pellet. In this study, a possible pro-duction principle of porous iron combined with this abnor-mal swelling and carbothermic reduction of the composite was studied. 2. Experimental 2.1 − Sample preparation Hematite (average particle size: 0.5 µm, purity: 99.9%)
(CBP) comprised of iron and steelmaking by-products have been studied . However, the effect of particle size on reduction behavior has been studied little. Due to the importance of iron making in the current and future technologies, the reduction of iron ore-coal composite pellets is probably one of the most studying topics.
The feasibility of producing Direct Reduced Iron from cold-bonded self-reducing composite pellets made from Anglo American Kumba Iron Ore Sishen upgraded slimes was considered on laboratory scale. Composite pellets were made by mixing Sishen upgraded slimes, coke and different binders using a pelletizing disc by addition of moisture.
Jan 19, 2018· In this paper the direct reduction melting separation-leaching process is investigated on recovering rare earth from rare earth Bayan Obo complex iron ore (REBOCIO). The REBOCIO was reduced and melting separated to produce iron nugget and …
RAPID REDUCTION OF NANO-SIZE IRON ORE PARTICLES IN AN IRON ORE/CARBON COMPOSITE . Kouichi Miura *, Masato Kawanari and Ryuichi Ashida . Department of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan . Summary . Feeding an iron ore/carbon composite (IOC) in addition to conventional sintered ore and coke to the
an innovative raw material " Carbon Iron Composite" for satisfying both high coke reactivity and iron ore reduction, focusing on the temperature of the thermal reserve zone. Carbon Iron Composite is produced by mixing coal and iron ore (pellet feed) and densification by hot briquetting, followed by carbonization of the bri-
The utilisation of low-grade raw materials such as fine iron ore and semi-soft coking coal, and reduction of CO2 emissions are important issues in the ironmaking process. To solve these issues, a new process called PosPRA (POSCO prereduced agglomeration process) has been developing at POSCO. It focuses on the reduction of carbon composite iron ore...
fines, then to have a coating with iron ore followed by drying and induration non- isothermally. Iron ore coated on the surface of the pellet acts as a protective coating and it separates iron ore/carbon mixed core from the ambient atmo-sphere. The reduction of iron ore- …
Reduction of carbon composite iron ore hot briquette takes place by heating only, and is assumed to provide excellent reduction performance, but no report has been yet made on reducing and melting behaviors of carbon composite iron ore hot briquette of by heating in shaft furnace.
in the form of coal composite iron ore agglomerates.1 However, extensive understanding of DRI production technology using magnetite ore is limited. The fundamental investigations on the mechanism and kinetics of carbothermic reduction in iron oxide were extensively carried out for the carbon composite iron ore agglomerates. Rao3 found that the ...
Carbon composite iron ore hot briquette (CCB) is the product of fine iron ore and fine coal by hot briquetting process, which attracts more and more attention as a new type of ironmaking raw materials aiming to improve the operation efficiency and reduce the coke consumption of blast furnace.
Iron Ore Reduction with CO and H2 Gas Mixtures - Research Online. Oct 2, 2008 ... The reduction of iron ore pellets has been studied using different techniques. ... of different pellet types in the new direct reduction process. ... Development of Carbon Iron Composite Process. reduction, focusing on the temperature of the thermal reserve zone ...
Carbothermic reduction of iron oxide is an attractive mechanism to produce metallic iron, since it can directly utilise coal as both reductant and fuel. To improve energy efficiency and productivity of the metallic iron production based on this mechanism, the combustion bed process packed with the composites of iron oxide and coal powder was experimentally...
Jun 04, 2019· COMPUTER MODELLING Modelling the Reduction of an Iron Ore-Coal Composite Pellet with Conduction and Convection in an Axisymmetric Temperature Field. Description. A mathematical model of the coal-based direct reduction process of iron ore in a pellet composed of coal and iron ore mixture is investigated using a finite-control volume method. Heat ...
parameters and optimization of reduction conditions. In this study, iron ore samples and coal were proportionally mixed and squeezed to a composite briquette. The composite briquettes were then reduced through coal-based reduction at various reduction temperatures, durations, and ore size fractions. The degree of metallization and microstructure of
Iron ore with high hydroxyl content such as goethit is widely spread in Indonesia. Such iron ore is not used as feed in ironmaking industry. However due to limitation of primary iron ore reserve such material is an option to substitute the conventional iron ore. Unfortunately the characteristic of iron ore with high hydroxyl content is totally different to conventional iron ore.
Carbon-composite briquetting of iron ore fines & fast-reduction into DRI in the rotary hearth furnace. GoodRich offers the technology for carbon-composite briquetting & subsequent reduction of iron ore into DRI in the rotary hearth furnace from a reputed manufacturer in China, in capacities from 70,000 tons to 320,000 tons per year. ...
Recently, increasing attention has been paid to alternative ironmaking processes due to the desire for sustainable development. Aiming to develop a new direct reduction technology, the paired straight hearth (PSH) furnace process, the carbothermic reduction of ore-coal composite pellets in a tall pellets bed was investigated at the lab-scale in the present work.
Abstract. The effect of carbon-to-hematite molar ratio has been studied on the reduction efficiency of iron ore-coal composite pellet reduced at 1523 K (1250 °C) for 20 minutes in a laboratory scale multi-layer bed rotary hearth furnace (RHF).
Nov 15, 2013· Fig 2 Flow sheet of FASTMET/FASTMELT process. The reduction reaction kinematics in a direct reduction furnace is normally controlled by the reduction gas diffusion from the outside. In the FASTMET process, the reduction reaction occurs inside the carbon composite pellets/briquettes made up of iron ore fines and the pulverized coal (Fig 3).
Sep 30, 2010· Carbon content in the iron was analyzed after reduction and carburization of Fe 2 O 3. It is considered that there are many possibilities in the real process to carburize the reduced iron during the heating process, such as carburization with CO formed by coal combustion, solution loss reaction, and direct carburization with coal.
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