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 orig

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