Carbothermal Reduction of Iron Ore Applying Microwave Energy

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 degree of reduction gradually increased with temperature rising, and the appropriate temperature of reducing pellets was 1200°C. The weight loss rate and reduction degree of pellets increased with the rise of carbon proportion, and the relatively reasonable mole ratio of carbon to oxygen was 0.9. A higher content of carbon and an appropriate content of volatile matters in biomass char were beneficial to the reduction of pellets. The carbon-containing pellets could be reduced at high speeds in the air, but there was some reoxidization phenomenon.

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Experiment Study on the High-Phosphorus Hematite Carbothermal Reduction in Microwave Field

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.291-294.1317 ◽

2011 ◽

Vol 291-294 ◽

pp. 1317-1320

Author(s):

Zhi Jun He ◽

Yong Long Jin ◽

Hui Zhang

Keyword(s):

Experimental Research ◽

Iron Content ◽

Carbothermal Reduction ◽

Iron Ore ◽

Microwave Field ◽

Experiment Study ◽

High Phosphorus ◽

Reduction Of Iron ◽

Speed Up ◽

Dephosphorization Rate

In the paper, the experimental research on dephosphorization and iron yield for high-phosphorus oolitic hematite by coal-based carbothermal reduction was carried out. It indicated that microwave can speed up the rate of carbothermal reduction of iron ore and strengthen the effects of dephosphorization and increasing iron content. The dephosphorization rate and iron yield of high-phosphorus oolitic hematite exceeding 87.8% and 91.8% by the way of carbothermal reduction in the microwave field and a further fine-grinding and magnetic separation.

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An Assessment of the Carbothermal Reduction of Malaysian Ilmenite by Statistical Design

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.858.221 ◽

2013 ◽

Vol 858 ◽

pp. 221-227 ◽

Cited By ~ 3

Author(s):

Hanizam Shah Saidin ◽

S. Aishah Syed Salim ◽

Norlia Baharun ◽

S.A. Rezan ◽

Hussin Hashim

Keyword(s):

Experimental Design ◽

Factorial Design ◽

Strong Interaction ◽

Carbothermal Reduction ◽

Iron Ore ◽

Statistical Design ◽

Operating Parameters ◽

Catalyst Amount ◽

Reduction Time ◽

Reduction Of Iron

Statistical design analysis (factorial design) was utilized to verify the significance and the interaction between the studied factors include temperature, reduction time and catalyst amount. Carbothermal reduction of iron ore sample was carried out at temperature between 1000°C to 1200°C. The effects of operating parameters studied were extent of reduction (X), carbon consumed (Cconsumed ) and nitridation (XN). Temperature was the most influential parameter that showed strong interaction with the operating parameters, meanwhile, reduction time and catalyst have showed the contrary results and had a very low percentage of contribution. The results of the experimental design showed that the extent of reduction reached up to 93% at 1200°C using 10 wt. % catalysts after 180 minutes reduction. The use of 0-10 wt % catalyst at 1200°C for 180 min reduction significantly affect the X but did not for Cconsumed and XN.Keywords: Carbothermal Reduction, Factorial Design, Malaysian Ilmenite, Nitridation.

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