Basic properties of steel plant dust and technological properties of direct reduction |
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| Authors: | Xue-feng She Jing-song Wang Qing-guo Xue Yin-gui Ding Sheng-sheng Zhang Jie-ji Dong Hui Zeng |
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| Affiliation: | (1) Volgograd State Technical University, Volgograd, Russia |
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| Abstract: | Basic physicochemical properties of the dust from Laiwu Iron and Steel Co. Ltd. were studied. It is found that C, Zn, K, Na,
etc. exist in the fabric filter dust, off gas (OG) sludge, fine ash in converter, and electrical field dust in sinter. Among
these, OG sludge gives the finest particle, more than 90% of which is less than 2.51 μm. The dust can lead to a serious negative
influence on the production of sintering and blast furnaces (BF) if it is recycled in sintering. The briquette and reduction
experimental results showed that the qualified strength could be obtained in the case of 8wt% molasses or 4wt% QT-10 added
as binders. Also, more than 75% of metallization ratio, more than 95% of dezincing ratio, as well as more than 80% of K and
Na removal rates were achieved for the briquettes kept at 1250°C for 15 min during the direct reduction process. SEM observation
indicated that the rates of indirect reduction and carbonization became dominating when the briquettes were kept at 1250°C
for 6 min. |
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