A sorting-grade pre-selection and tailings throwing process for extremely lean hematite

Abstract

The present invention relates to a sorting-grade pre-selection and tailing-throwing process of extremely poor hematite, which includes semi-autogenous grinding to obtain semi-autogenous grinding ore discharge with a particle size of 14-0 mm, and is characterized in that it also includes screening and coarse-grain pre-selection I , Coarse grain pre-selection II, one-stage closed-circuit grinding, coarse-grain pre-selection III, second-stage closed-circuit grinding; screening adopts three-layer linear vibrating screen, and among the four products, ‑14mm~10mm particle size returns to semi-autogenous grinding, and ‑10mm~6mm and ‑6mm~2mm particle size are pre-selected by coarse-grain pre-selection Ⅰ and coarse-grain pre-selection Ⅱ respectively, and the coarse-grained tailings are thrown out. The 2mm particle size is fed into the coarse-grain pre-selection operation III pre-selection tailings, the coarse-grain pre-selection operation III concentrate is fed into the second-stage closed-circuit grinding, and the overflow from the second-stage closed-circuit grinding is fed into the subsequent separation operation. The advantages are: the ore discharge is divided into narrow grades and pre-selected separately, qualified coarse tailings are thrown out, the problem of persistent rock accumulation is solved, and the processing capacity of the 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 kind of 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 ore discharge from the semi-autogenous mill is fed into the linear vibrating screen with a screen hole size of 2mm for screening, and the products on the screen are returned to the semi-autogenous mill, and the products under the linear vibrating screen with a particle size of 2-0 mm are sent to the wet pre-selection weak magnetic separation The coarse-grained weak magnetic concentrate with a grade of 27% to 29% is obtained by machine; the t...

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

Images