MHA黏结剂在钒钛磁铁矿氧化球团制备中的应用

Applications of MHA binder in oxidized pellets preparation from vanadium,titanium-bearing magnetite concentrates

应用已发明的MHA黏结剂替代膨润土制备钒钛磁铁矿氧化球团,获得质量优良的高炉冶炼原料。研究表明:当MHA用量为0.25%,在预热温度950℃,预热时间10 min,焙烧温度1 250℃,焙烧时间10 min的条件下,获得的预热球团抗压强度为522 N/个,焙烧球团抗压强度为3 702 N/个。与2.0%膨润土球团矿比较,MHA成品球团的抗压强度略低,而TFe品位明显提高1.11%。2种黏结剂球团矿的还原性能指标接近。MHA球团黏结剂在氧化球团矿生产中具有良好的应用前景。

MHA invented by Central South University was used as an alternative binder of bentonite for oxidized pellet preparation from vanadium, titanium- （V, Ti-） bearing magnetite concentrates, and high-quality blast furnace burdens were obtained. Final results show that preheated pellets with 522 N/P compressive strength and roasted pellets with 3 702 N/P compression strength are achieved, under conditions that MHA dosage is 0.25%, preheating temperature is 950 ℃, preheating time is 10 min, roasting temperature is 1 250 ℃ and roasting time is 10 min. Compared 0.25% MHA pellets with 2.0% bentonite pellets, compression strength of MHA pellets is a little lower, while content of total iron （TFe） of them increases by 1.11%. The reducibility performance index of two kinds of roasted pellets is approximate. MHA binder has good application prospect in the oxidized pellets production.