Method for iron concentrate in ore grinding, coarse and fine separation, gravity-magnetic-flotation process tailings in recovery stage

Abstract

The invention relates to the technical field of re-election of lean hematite tailings, in particular to a method for iron concentrate in tailings in the recovery stage of grinding, coarse and fine separation, and gravity-magnetic-flotation process, which is characterized in that the lean hematite stage The comprehensive tailings in the combined process of ore grinding, coarse and fine classification, gravity separation-magnetic separation-flotation are obtained by gravity separation and weak magnetic sweeping. Roughing, beneficiation and three-stage scavenging of weak magnetic and strong magnetic-reverse flotation operations to recover magnetic ore in tailings. In the present invention, the comprehensive tailings are sorted by gravity separation and weak magnetic sweeping, and the rough concentrate with a grade of 27% to 31% is recovered, which reduces the processing capacity of subsequent grinding and sorting operations and improves the selection of subsequent operations Grade; regrind the coarse concentrate to dissociate the intergrowth in the coarse concentrate; use weak magnetic, strong magnetic-reverse flotation to sort the regrind coarse concentrate, and obtain the final grade of more than 66%. Concentrate, to reduce the comprehensive tailings grade by 1%, to achieve the effective use of resources.

Description

technical field [0001] The invention relates to the technical field of re-selection of lean hematite tailings, in particular to a method for recovering ore grinding, coarse and fine separation, and heavy-magnetic-flotation process tailings iron concentrate. Background technique [0002] At present, the lean iron ore resources mined and utilized are mainly hematite and magnetite. Since iron ore resources are non-renewable resources, in order to effectively utilize limited resources, extract valuable components in tailings and improve the recovery rate of resources , the research on improving the comprehensive utilization value of resources has started as early as the 1980s. [0003] For the recovery of lean hematite tailings obtained by "stage grinding, coarse and fine separation, and combined gravity-magnetism-flotation process", although many experimental studies have been carried out, due to the improvement of the level of mineral processing technology, the existing The p...

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Problems solved by technology

[0003] For the recovery of lean hematite tailings obtained by "stage grinding, coarse and fine separation, and combined gravity-magnetism-flotation process", although many experimental studies have been carried out, due to the improvement of the level of mineral processing technology, the existing The production process has a high recovery rate of hematite, and the particle size composition of the tailings produced by the current production process is also very different from the particle size composition of the tailings produced by the original hematite sorting process. The lean hematite tailings produced by the hematite ore concentrator are directly discharged to the tailings pond

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