鞍钢脱硫扒渣的综合回收利用研究

Comprehensive Utilization of Slag from Desulphurization and Slag Skimming Processes of Ansteel

为实现脱硫扒渣资源的有效利用,利用化学分析、光学显微镜、XRD、SEM等分析和检测手段研究了鞍钢一炼钢厂铁水预处理脱硫扒渣的组成特性,并根据其组成特性制定了相应的提铁降硫选别流程。试验结果表明,采用磨矿分级-重选-磁选联合流程可以得到较好的选别指标,将原渣样磨至-0.074 mm粒级占54.20%,+0.3 mm粒级直接作为铁精矿进行回收,对-0.3 mm粒级先重选、重选精矿再磨后采用磁选分离,得到的铁精矿TFe品位为86.32%、回收率为78.48%、S品位为0.21%。

In order to utilize the slag from desulphurization and slag skimming processes effectively, chemical analysis, optical microscope, XRD and SEM were adopted to investigate the composition characteristics of the slag obtained from the hot metal pretreatment process in the No.1 steelmaking plant of Ansteel, and based on the composition characteristics, relevant ore dressing flowsheet to raise the iron content and reduce the sulphur content was chosen. The results indicate that good separation index can be obtained by adopting a flowsheet consisting of grinding-classification, gravity concentration and magnetic separation. As the grinding fineness - 0. 074 mm of 54.20%, the ＋ 0.3 mm range can be reclaimed directly, while the -0.3 mm range can be treated following a flowsheet consisting of gravity concentration, regrinding and reconcentration with magnetic separation. Finally, an iron concentrate with an iron grade and recovery of 86.32% and 78.48% respectively, and with a sulphur content of 0.21%, can be obtained.