Title

Pre-reduction of Iron Oxide with Coal Carbonization Gas without Tar

Pre-reduction of Iron Oxide with Coal Carbonization Gas without Tar

Authorship

INOUE, NORIYOSHI; USUI, TATEO

INOUE, NORIYOSHI

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USUI, TATEO

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DOI

10.5151/2594-357x-34Red-643-652

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Abstract

Volatile matter, which occupies more than 20 mass% of non-coking coal, is not utilized when the coal is fed directly into the smelting furnace. Its presence may even cause adverse effects in the operation. Therefore, the fundamental study on pre-reduction of iron oxide was carried out in order to investigate the conditions for efficient use of volatile matter in an iron bath smelting reduction total process. The final fractional reduction, F, was calculated from the loss in weight of pellets after reduction. Presence of combined water in coal affected F: In Newlands coal, there was a decrease in F at higher temperatures. However, when the combined water was removed, F increased. In Muswellbrook coal, when the combined water was removed, F increased linearly from 0.07 to 0.25 at the reduction temperatures from 673K up to 1073 K, beyond which F increased more than the linear relation, such as F = 0.35 at 1173 K and 0.43 at 1273 K. This may be due to the contribution of hydrocarbons in the reduction reaction at high temperatures.

Volatile matter, which occupies more than 20 mass% of non-coking coal, is not utilized when the coal is fed directly into the smelting furnace. Its presence may even cause adverse effects in the operation. Therefore, the fundamental study on pre-reduction of iron oxide was carried out in order to investigate the conditions for efficient use of volatile matter in an iron bath smelting reduction total process. The final fractional reduction, F, was calculated from the loss in weight of pellets after reduction. Presence of combined water in coal affected F: In Newlands coal, there was a decrease in F at higher temperatures. However, when the combined water was removed, F increased. In Muswellbrook coal, when the combined water was removed, F increased linearly from 0.07 to 0.25 at the reduction temperatures from 673K up to 1073 K, beyond which F increased more than the linear relation, such as F = 0.35 at 1173 K and 0.43 at 1273 K. This may be due to the contribution of hydrocarbons in the reduction reaction at high temperatures.

Keywords

pre-reduction, volatile matter, carbonization gas

pre-reduction, volatile matter, carbonization gas