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...

AI Technical Summary

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 wet pre-selection process, to ensure The processing capacity of the semi-autogenous mill meets the design requirements, and at the same time provides conditions for subsequent operations, saves energy and reduces consumption, and improves the efficiency of the overall grinding and separation process

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