When one kind of higher grade geological deposits (50%), but thinner or more interlayers ore mining: gravity separation iron ore, the iron ore is mainly used for magnetic sorting, there are two application The waste rock is mixed to deplete the ore. For this ore, only the crushed and ungrinded mine can be used. In the case of coarser grain size, the coarse tailings are discarded by re-election to restore the geological grade. Obtain coarse grain medium grade concentrate, or further processing, or directly send blast furnace smelting, this is called coarse grain re-election. The other is to refine the red or mineral ore (ie, weakly magnetic red ore and ferromagnetic magnetite) with fine grain size, after crushing, grinding to separate the iron mineral monomer, or by re-election or The magnetic weight is selected to obtain a fine-grained high-grade concentrate, which is called fine-grain re-election.
An iron ore is a medium-high temperature hydrothermal deposit. The main metal ore mineral hematite, artifacts hematite, magnetite, hematite, limonite; major gangue minerals as quartz, calcite, apatite, iron and clay, iron In the deposit, the fine aggregates form a dense block, loosely blocky, partially impregnated and honeycomb embedded in the gangue, the impregnated granules are generally at 0.03mm, the ore body geological grade is 42%, and the mining is depleted. After the grade is 36% to 7%, the re-election process is selected as shown in the figure. When the ore grade is 36.5% Fe, the concentrate grade is 47% Fe, the tailing grade is 18.8%Fe, and the recovery rate is 80.8% Fe. Concentrate cost 22.81 yuan / t.
An iron ore (coarse grain) re-election process
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