Crushing-ore milling-magnetic separation technique for magnetic iron ore

Abstract

The invention relates to a crushing-ore milling-magnetic separation technique for magnetic iron ore. The technique comprises the step that raw ore is crushed into 0 mm-50mm through coarse crushing and middle crushing, and the technique is characterized by further comprising the following steps that middle crushed products are directly fed into a closed loop system formed by a high-pressure roller mill and a constant thickness screen; high-pressure roller mill products are fed into a pre-selection wet-type magnetic separator to be subjected to pre-selection wet-type magnetic separation, and concentrate and tailings are selected correspondingly; the pre-selection wet-type magnetic separation concentrate is fed into a vertical mill machine for milling, vertical mill machine products are fed into a primary classification whirlcone for classification, primary classification is conducted, the products with the diameters being below 0.074 mm are fed into a two-stage washing magnetic separator for separating operation, and the products with the diameters being above 0.074 mm are returned to the vertical mill machine; and concentrate of two-stage washing magnetic separator separating operation is final concentrate with the grade being 67.00%, and the pre-selection wet-type magnetic separation tailings and two-stage washing magnetic separator tailings are combined into final tailings. The crushing-ore milling-magnetic separation technique for the magnetic iron ore has the advantages that the technological process is shortened, energy consumption is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing technology, in particular to a magnetite crushing-grinding-magnetic separation technology. Background technique [0002] Magnetite is usually separated by the method of "crushing-stage grinding-magnetic separation. The process flow is: raw magnetite (1000mm-0) undergoes three-stage crushing operations of coarse crushing, medium crushing, and fine crushing, and the ore particle size reaches 12-0mm. (product after fine crushing), after a period of closed-circuit grinding, the primary classification overflow particle size reaches -200 mesh content of 55~60%, after a period of magnetic separation, some coarse-grained qualified tailings are thrown away, and the primary magnetic separation coarse and fine The ore undergoes closed-circuit grinding of the second-stage mill, and the secondary classification overflow particle size reaches -200 mesh content of 85%~90%. After being separated by the...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a magnetite crushing-grinding-magnetic separation process, which solves the problems of complex structure, large floor area and high energy consumption in the original traditional process, and at the same time, it can be used when the grinding fineness is lower than the traditional one. At 10 percent, the same concentrate product is obtained, saving energy and reducing consumption

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