Basic properties of steel plant dust and technological properties of direct reduction

作     者：Xue-feng She Jing-song Wang Qing-guo Xue Yin-gui Ding Sheng-sheng Zhang Jie-ji Dong Hui Zeng 

作者机构：School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Shandong Laiwu Iron and Steel Co. Ltd. Laiwu 271104 China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2011年第18卷第3期

页      面：277-284页

核心收录：

学科分类：080602[工学-钢铁冶金] 0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 0806[工学-冶金工程] 

主　　题：steel metallurgy dust zinc direct reduction process briquettes 

摘      要：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 mm. 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℃ for 15 min during the direct reduction process. SEM observation indicated that the rates of indirect reduction and carbonization became dominating when the bri-quettes were kept at 1250℃ for 6 min.