酒钢粉矿选别工艺优化研究

针对酒钢粉矿选别系统精矿铁品位低、杂质含量高,影响高炉冶炼系数提高及焦比降低的问题,在实验室进行了6种优化流程工艺流程的试验研究。结果表明,6种优化流程均可取得较显著的精矿提质降杂效果,与现场模拟流程试验结果相比,在精矿铁回收率相当的情况下,精矿铁品位可提高2.14～3.84个百分点,SiO2含量可降低2.66～5.43个百分点。通过对6种优化工艺的流程结构及选别指标进行对比,建议按其中的强磁粗选不得精矿的磁—浮流程2和强磁粗选得部分精矿的磁—浮流程2进行下一步的扩大试验。

Research on the Beneficiation Process Optimization of Powder Iron Ore in JiuSteel

Due to low-grade Fe and high impurity content in concentrate, the blast furnace smelting is affected and the coke rate is lowered in the beneficiation of powder iron ores of JISCO.In view of this issue, six optimal beneficiation tests in lab were conducted.The results showed that all these six tests realized the quality improvement and impurity reduction for concentrates.Compared with the results of on-site simulating flow-sheet, the Fe grade concentrate was improved by 2.14%~ 3.84%, and SiO2 content decreased by 2.66%~ 5.43% under the same of Fe recovery.After the comparison with the flow-sheet structure and the beneficiation indicators of six optimal processes, it is recommended that the next expansion tests follow the two processes of the magnetic separation-flotation where no concentrate are got at the rough high-intensity magnetic separation or some concentrates are got respectively.