国内某混合铁矿铁精矿提质降杂试验研究  

Experimental study on improving the quality and reducing impurities of a certain mixed iron ore concentrate in China

作　　者：张祖刚 甘茂武 张登锋 ZHANG Zugang;GAN Maowu and ZHANG Dengfeng(Mining Branch,Nanjing Baodi Meishan Industrial City Development Co.,Ltd.,Baowu Resources Co.,Ltd.,Nanjing 210041,Jiangsu,China)

机构地区：[1]宝武资源南京宝地梅山产城发展有限公司矿业分公司,江苏南京210041

出　　处：《宝钢技术》2024年第6期1-10,共10页Baosteel Technology

摘　　要：国内某混合铁矿选矿厂随着矿石进入深部开采,矿石中铁矿物的嵌布粒度和杂质w(SiO_(2))发生一定变化,导致铁精矿中w(SiO_(2))达到6.0%以上,为了降低铁精矿中杂质w(SiO_(2)),开展了选矿试验研究。试验推荐优化工艺流程为:弱磁粗选—弱磁扫选—隔粗(>0.25 mm)—SLON立环高梯度强磁粗选—SLON立环高梯度强磁扫选—弱磁和强磁扫选精矿再磨—弱磁选—SLON立环高梯度强磁选。结果表明:弱磁分选质量分数对弱磁选分选效果影响显著,当弱磁分选质量分数由33.3%下降到14.3%时,弱磁精矿w(TFe)可由60.84%提高到64.91%,其w(SiO_(2))由5.00%下降到3.02%。对弱磁扫选和强磁扫选精矿采用再磨(<74μm占60%)再选(弱磁—强磁)流程可获得铁精矿w(TFe)为59.31%、w(SiO_(2))为4.64%,铁回收率为90.44%。In response to the changes in the particle size and impurity SiO_(2) content of iron minerals in a domestic mixed iron ore beneficiation plant as the ore enters deep mining,resulting in a mass fraction of SiO_(2) greater than 6.0% in the iron concentrate,beneficiation experiments were conducted to reduce the impurity SiO_(2) content in the iron concentrate.The recommended optimized process flow for this experiment is:weak magnetic roughing—weak magnetic scanning—coarse separation(>0.25 mm)—SLON vertical ring high gradient strong magnetic roughing—SLON vertical ring high gradient strong magnetic scanning—weak magnetic and strong magnetic scanning concentrate regrinding—weak magnetic separation—SLON vertical ring high gradient strong magnetic separation.The results showed that the concentration of weak magnetic separation had a significant impact on the separation effect of weak magnetic separation.When the mass fraction of weak magnetic separation decreased from 33.3% to 14.3%,the mass fraction of TFe of weak magnetic concentrate increased from 60.84% to 64.91%,while its mass fraction of SiO_(2) decreased from 5.00% to 3.02%.The process of regrinding(<74μm accounts for 60%)and reselection(weak magnetic-strong magnetic)can be used for weak magnetic scanning and strong magnetic scanning concentrates to obtain iron concentrate with a TFe mass fraction of 59.31%,a SiO_(2) mass fraction of 4.64%,and iron recovery rate of 90.44%.

关 键 词：混合铁矿石 品位 再磨再选 金属回收率 

分 类 号：TD921.4[矿业工程—选矿]