镜铁山式铁矿选矿过程中K_(2)O含量走向分析  

Trend Analysis of Potassium Oxide Content in the Beneficiation Process of Jingtieshan Type Iron Ore

作　　者：钟志刚 王红[1,2] 刘升 ZHONG Zhigang;WANG Hong;LIU Sheng(Gansu Jiu Steel Group Hongxing Iron&Steel Co.Ltd.,Dressing Plant,Jiayuguan 735100,China;Gansu Provincail Key Laboratory of Refractory Iron Ore Resource Utilization,Jiayuguan 735100,China)

机构地区：[1]甘肃酒钢集团宏兴钢铁股份有限公司选矿厂,甘肃嘉峪关735100 [2]甘肃省难选铁矿石资源利用重点实验室,甘肃嘉峪关735100

出　　处：《甘肃冶金》2024年第3期16-19,共4页Gansu Metallurgy

基　　金：中央引导地方科技发展资金项目(22ZY1QB002)。

摘　　要：针对镜铁山式难选氧化铁矿矿石特点及酒钢选矿厂现有工艺流程,为减少酒钢高炉吨铁碱金属负荷,尤其是K_(2)O含量,确保后续烧结及炼铁工序顺利进行,对选矿不同工艺流程中的原矿矿石性质进行研究,发现K_(2)O主要赋存矿物为白云母,镜铁山矿经筛分分为强磁粉矿和块矿,块矿经过焙烧抛废后其K_(2)O含量基本稳定在0.405%,满足炼铁精矿质量要求;强磁粉矿中K_(2)O含量较高,通过考察现场强磁选流程,发现立环机及筒式磁选机对脉石矿物白云母具有一定的分选作用,在对设备运行参数进行调整后可进一步将K_(2)O富集在尾矿中,最终可获得铁精矿品位44.90%,回收率59.71%,K_(2)O品位为0.362%的合格铁精矿,为适时控制难选氧化铁矿石选别产品综合铁精矿质量提供一定的数据参考。In view of the characteristics of Jingtieshan refractory oxidized iron ore and the on-site process flow of Jiusteel concentrator,in order to reduce the alkali metal load per ton of iron in Jiusteel blast furnace,especially the K_(2)O content,in order to ensure the smooth progress of subsequent sintering and ironmaking process,the properties of raw ore in different beneficiation processes were studied.It is found that the main mineral of K_(2)O is muscovite.Jingtieshan mine is divided into strong magnetic powder ore and lump ore by screening.After roasting and discarding,the K_(2)O content of lump ore is basically stable at 0.405%,which can meet the quality requirements of ironmaking concentrate.The content of K_(2)O in the strong magnetic powder ore is higher.Through the investigation of the on-site strong magnetic separation process,it is found that the vertical ring machine and the drum magnetic separator have a certain separation effect on the gangue mineral muscovite.After adjusting the operating parameters of the equipment,K_(2)O can be further enriched in the tailings.Finally,a qualified iron concentrate with an iron concentrate grade of 44.90%,a recovery rate of 59.71%,and a K_(2)O grade of 0.362%can be obtained,which provides a certain data reference for the timely control of the comprehensive iron concentrate quality of the refractory iron oxide ore separation products.

关 键 词：镜铁山式难选氧化铁矿石 碱负荷 K_(2)O 粉矿 强磁选 

分 类 号：TD951[矿业工程—选矿]