Iron ore dressing practice (2)

Angang DONGANSHEN iron ore hematite is typically poor, with a low grade, disseminated fine grain size, structure building complex features. Mainly iron minerals martite, magnetite, hematite, limonite secondary minerals, siderite, gangue minerals quartz, chlorite-based phosphor, a small amount of Iron amphibole, actinolite , tremolite , calcite, etc. Donganshan Sintering Plant adopts two-stage continuous grinding-coarse subdivision-middle-mine re-grinding-re-selection-magnetic separation-anion reverse flotation process. The final grinding fineness of the second section is -0.074mm, accounting for 80%. Grinding fineness -0.074mm accounted for 71%. The overflow of the secondary grinding enters the cyclone for coarse subdivision, the coarse material is fed into the re-election operation, and finally the re-election concentrate is produced; the fine-grained material adopts the weak magnetic separation-strong magnetic-anion reverse flotation process, The grade of iron concentrate increased from 31.36% to 66.42%. The coarse-grained re-concentration concentrate and the fine-grained flotation concentrate are combined to form the final concentrate. The production index of Donganshan Sintering Plant is: 31.73% of the original ore grade, 64.80% of the concentrate grade, 16.05% of the tailings grade, and the recovery rate of 74.92%.

Steel beneficiation plant process Baiyunebo lean oxide ore, iron minerals mainly hematite, magnetite, followed pyrite gangue minerals are fluorite, carbonate minerals, followed feldspar , barite, etc. The grinding production process of Baotou Steel Concentrator is a three-stage and two closed-circuit grinding grading process, one section is rod grinding, the second section is lattice type ball mill , the third section is overflow type ball mill, and the grinding fineness is -0.174 mm accounted for 90%. Under the condition of -95%, the minerals are sorted according to the magnetic strength by simple weak magnetic separation-strong magnetic separation, and rationally grouped to obtain iron-rich weak magnetic separation and strong magnetic separation concentrate, rich in rare earth. The strong magnetic medium mine, and the removal of mineral mud and non-magnetic gangue minerals accounting for about 40% of the original ore. Weak magnetic separation and strong magnetic separation of mixed concentrates using sodium silicate as inhibitor, hydrocarbon-based sulfonic acid and carboxylic acid collector for reverse flotation, removal of fluorine, phosphorus and other carbonates, phosphate minerals, flotation The process is a rough and two fine. The ore grade was selected to be 31.85%, and the iron concentrate grade was 62.51%, and the recovery rate was 71.48%.

The main minerals in the iron ore processed by Hainan Iron and Steel Company's 1.1 million tons/year concentrator are mainly hematite (including specular iron or pseudo-hematite), a small amount of magnetite, limonite, and other small or trace amounts of gold. genus minerals pyrite, copper ore, pyrrhotite and the like. The gangue minerals are mainly quartz, others are chlorite, biotite , sericite and the like. After two sections of closed ore grinding, the ore enters a weak magnetic separation condition under the condition of grinding fineness -0.074mm accounting for 90%, and the ferromagnetic tailings are selected by strong magnetic separation and weakening. After the concentrated magnetic concentrate is concentrated, the anti-flotation desulfurization and desiliconization are carried out. In the case of the original ore grade of 47.63%, the iron concentrate with a grade of 64.50% and an iron recovery rate of 71% is finally obtained.

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