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...

Images