(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.
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-
Reduction of Goethitic Iron Ore Using Thermogravimetric Method, Adji Kawigraha et al. release (Strezov et al., 2010). The endothermic peak occurs at 301.9 °C. In the second region which ranges between 370 and 640 °C, there is only low endothermic peak and after 640 °C the heat curve has another endothermic peak near 900 °C.
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.
THE REDUCTION OF COMPOSITE IRON ORE-COAL PELLETS TO LI QUID IRON by CLI&tORD JOHN ADAMS, B.Sc., M.Sc. '" ''c; ·t I I A Thesis Submitted to the School of Graduate Studies in Partial Fulfilment of the Requirements
The product of this process which is a carbon–magnetite composite with close arrangement of iron ore and carbon is useful for reduction of iron by carbon and is able to lower the temperature ...
The demonstrate the process, preliminary reduction experiments of magnetite ore-lignite coal composite pellets were carried out using a combined solar simulator-reactor setup and 55% metallisation was obtained at temperature of 1130 °C.
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.
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.
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.
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).
in the reduction of the carbon iron ore composite. Accordingly, the particle size and reactivity of reducing agents such as coke have an inﬂuence on the reduction rate of the carbon iron ore composite. The inﬂu-ence of the gas composition in the atmosphere around the composite on the reduction is analyzed by using
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. ...
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.
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%)
CN1924035A CN 200510032095 CN200510032095A CN1924035A CN 1924035 A CN1924035 A CN 1924035A CN 200510032095 CN200510032095 CN 200510032095 CN 200510032095 A CN200510032095 A CN 200510032095A CN 1924035 A CN1924035 A CN 1924035A Authority CN China Prior art keywords iron ore sintering containing added Prior art date 2005-09-01 Application …
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- …
Over 90% reduction of the iron ore can be achieved in about 10 minutes at temperatures about 1,000 C with 20% excess stoichiometric carbon in the mix. The reduction of iron ore with coal by microwave heating produces a pure, dust-free, and high Btu flue gas that can be used in related thermal operations.
AbstractThe reduction of hematite iron ore fines by different carbonaceous materials in composite pellets in a one-layer bed under nonisothermal asymmetric heating from above is studied. Temperature measurements at various points in the bed show that there are large gradients both inside and outside the pellets, with the reduction fastest at the top where the temperature is highest.
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.
Download Citation on ResearchGate | Reduction and Carburization of Carbon Composite Iron Ore Hot Briquet on Condition of Increasing in Temperature | Carbon composite iron ore hot briquet was new ...
Keywords: Tunnel Kiln, Iron ore-coal composite pellets, Sponge iron, Thermal efficiency, Carbon utilization efficiency, Percentage metallic iron . 1. INTRODUCTION The tunnel kilns are mostly used by the ceramic industries for heating refractory and ceramic products [1-2]. In the year 1908 use of tunnel kiln started for iron oxide reduction. This
The published approaches to the mathematical modeling of rates of reduction, of coal gasification, and of devolatilization of coal in iron/ore coal composites are reviewed and critically analyzed. The effect of different parameters on the overall process is discussed.
tained in a rotary hearth furnace. The carbon composite iron ore hot briquette was developed for being used in the shaft furnace.4) Reduction degree reached 95% in about 10min during the briquette descending to the bottom of heat reserve zone of 1373K. Therefore, Utilization of the carbon composite iron ore hot briquette was promising to
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).
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
Direct reduced iron (DRI), also called sponge iron, is produced from the direct reduction of iron ore (in the form of lumps, pellets, or fines) to iron by a reducing gas or elemental carbon produced from natural gas or coal.Many ores are suitable for direct reduction. Reduced iron derives its name from the chemical change that iron ore undergoes when it is heated in a furnace at a high ...
aspects in reduction of iron oxide were investigated. The experimental studies on reduction of iron oxide pellets were performed under well-controlled conditions in a setup designed for thermogravimetric investigations. The results indicated that the reaction rates by the applied procedure are higher compared to the procedure similar to
Use of Iron Ore Fines in Cold-Bonded Self-Reducing Composite Pellets I. Nikai and A. M. Garbers-Craig Department of Materials Science and Metallurgical Engineering, Faculty of Engineering, Built Environment and Information Technology, University