镜铁山复杂难选氧化铁矿石选别试验研究

Experimental Study on Separation of Complex Refractory Iron Oxide Ore in Jingtieshan

多年来,镜铁山桦树沟矿区V矿体矿石利用率低,为充分发挥V矿体矿石产能,并确保矿区各矿体之间的采掘关系平衡,针对复杂难选的V矿体氧化铁矿石进行块矿预选—竖炉焙烧—磁选—反浮选工艺条件试验研究。在原矿TFe品位为25.92%,主要矿物赤(镜)铁矿、褐铁矿及菱铁矿嵌布粒度较细,脉石矿物SiO_(2)品位高达40.10%的条件下,经块矿预选抛废13.33%后,在还原剂质量比为4%、温度为650℃条件下还原焙烧45~65min,然后两段阶段磨矿-三段磁选,磁选精矿再磨作业后,添加抑制剂苛性淀粉及阳离子捕收剂YG-328B,进行一粗一精四扫常温反浮选,最终取得精矿TFe品位为61.06%、SiO_(2)含量为6.86%、铁回收率为75.40%的良好指标,实现了V矿体矿石资源的有效利用。

For many years,the ore utilization rate of V ore body in Huashugou mining area of Jingtieshan was low.In order to give full play to the ore production capacity of V ore body and ensure the balance of mining relationship between ore bodies in the mining area,the experimental study on the technological conditions of block ore pre-concentration—shaft furnace roasting—magnetic separation—reverse flotation was carried out for the complex and difficult-to-separate V ore body iron oxide ore.Under the condition that the TFe grade of the raw ore is 25.92%,the main minerals hematite(specular)iron ore,limonite and siderite are finely disseminated,and the SiO_(2)grade of gangue minerals is as high as 40.10%.After pre-concentration and discarding of 13.33%of the lump ore,the reduction roasting was carried out at 650℃for 45-65min with the mass ratio of reducing agent of 4%,and then two stage grinding-three stage magnetic separation was carried out.After the regrinding of the magnetic separation concentrate,the inhibitor caustic starch and cationic collector YG-328B were added,and the reverse flotation of one roughing,one cleaning and four scavenging at room temperature was carried out.Finally,good indexes of concentrate with TFe grade of 61.06%,SiO_(2)content of 6.86%and iron recovery of 75.40%have been obtained,which can realize the effective utilization of ore resources in V ore body.