(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 以Al2O3含量為26.35%，總Fe含量為31.22%，鋁硅比為3.17的某高鐵三水鋁石型鋁土礦為原料，研究了堿度、焦粉用量、混合料水分等對燒結(jié)礦質(zhì)量指標(biāo)的影響。結(jié)果表明：燒結(jié)礦堿度增加時，其轉(zhuǎn)鼓強度和成品率下降，燒結(jié)礦自粉化程度加重；焦粉用量增加時，燒結(jié)礦轉(zhuǎn)鼓強度和成品率提高；當(dāng)混合料水分為9.0%、焦粉用量為8.0%、燒結(jié)礦堿度為4時，燒結(jié)礦轉(zhuǎn)鼓強度為69.1%，成品率為81.2%，垂直燒結(jié)速度為30 mm/min，利用系數(shù)為1.2 t/(h?m2)；燒結(jié)礦堿度為4時，樣品存放2天粉化率為5%，燒結(jié)礦平均粒度由22.2 mm減小到21.9 mm，延長存放時間，燒結(jié)礦自粉化率增大，平均粒度顯著減小。該燒結(jié)礦的冶金性能能基本滿足高爐冶煉的要求。
關(guān)鍵字: 高鐵三水鋁石型鋁土礦；燒結(jié)特性；超高堿度；綜合利用
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The influences of basicity, coke dosage and moisture on sintering performance were studied respectively by using a sample with 26.35% Al2O3, 31.22% Fet, and mass ratio of alumina to silica 3.17. The results show that the tumbling index and finished products efficiency increase with increasing coke dosage, while decrease with increasing basicity. Sinter spontaneous pulverization becomes severer as basicity increases. The tumbling index is 69.1%, finished products efficiency is 81.2%, sintering speed is 30 mm/min and productivity is 1.2 t/(h?m2) under the conditions of moisture of 9.0%, coke dosage of 8.0% and basicity of 4. After being stored for 2 d, the spontaneous pulverization of the sinter reaches 5% and the average particle size decreases from 22.2 mm to 21.9 mm. The sinters spontaneous pulverization increases while the average particle size of sinters decreases with prolonging storage time. The metallurgical performance of sinters can meet the requirement of BF smelting.
Key words: high iron gibbsite-type bauxite; sintering property; super-high basicity; complex utilization
