Experimental Study on Separation of Complex Refractory Iron Oxide Ore in Jingtieshan
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 SiO2 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 45-65 min 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％,SiO2 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.
Refractory iron oxide orePre-selection discardingReduction roastingMagnetic separationReverse flotation
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