Size-fractionated pre-selection tailing discarding process of extremely-poor hematite

Abstract

The invention relates to a size-fractionated pre-selection tailing discarding process of extremely-poor hematite. The process comprises a step of carrying out semi-autogenous grinding to obtain semi-autogenous grinding discharge ore with a particle size of 14-0mm. The process is characterized by screening; carrying out coarse grain pre-selection I; carrying out coarse grain pre-selection II; carrying out first-section closed-circuit grinding; carrying out coarse grain pre-selection operation III; and carrying out second-section closed-circuit grinding. A three-layer linear vibrating screen isadopted for screening. In four products, the product with a size fraction of-14 mm to 10 mm is returned to semi-autogenous grinding. The coarse grain pre-selection I and the coarse grain pre-selectionII are used for pre-selecting a -10mm-6mm size fraction and a -6mm-2mm size fraction. Coarse-grain tailings are thrown out, coarse-grain concentrates are combined and fed into first-section closed-circuit ore grinding, a first-section closed-circuit ore grinding product and the screened -2 mm size fraction are fed into coarse-grain pre-selection operation III for pre-selection tailing discarding,coarse-grain pre-selection operation III concentrates are fed into second-section closed-circuit ore grinding, and second-section closed-circuit ore grinding overflow is fed into subsequent sorting operation. The process has advantages that discharge ore is divided into narrow grades for respective pre-selection; qualified coarse grain tailings are thrown out; and a problem of stubborn stone accumulation is solved, and a processing capacity of a semi-autogenous mill is improved.

Description

technical field [0001] The invention belongs to the technical field of pre-selection coarse-grained tailings for iron ore dressing, and in particular relates to a particle-level pre-selection and tailings technology for extremely poor hematite. Background technique [0002] A very poor hematite ore dressing plant adopts a coarse-grained wet pre-selection process to process a very poor hematite ore. This process first feeds the very poor hematite ore with a grade of about 18% after coarse crushing into a semi-autogenous mill. , the semi-autogenous mill discharges ore and feeds it into a linear vibrating screen with a sieve size of 2mm for screening, and the product on the screen returns to the semi-autogenous mill, and the product under the linear vibrating screen with a particle size of 2-0mm is sent to a wet pre-selection weak magnetic separator Coarse-grained weak magnetic concentrate with a grade of 27% to 29% is obtained; the tailings of the pre-selected weak magnetic se...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of grain-grading preselection tailings throwing process of extremely poor hematite, to solve the problem of semi-autogenous grinding machine stubborn stone accumulation in the extremely poor hematite semi-autogenous grinding-coarse...

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