Beneficiation method for recycling specularite

Abstract

The invention discloses a benefication method for recovering specularite. The method comprises the processes of primary grinding, grading, primary low intensity magnetic separation, and tailings discarding by primary high intensity magnetic separation; rough concentrate pre-classification by the primary low intensity magnetic separation and the primary high intensity magnetic separation, secondary grinding, secondary low intensity magnetic separation to obtain concentrates, secondary high intensity magnetic separation to obtain concentrates; and selective flocculation desliming secondary conducted on high intensity magnetic separation tailings (middlings), and anionic reverse flotation. The method further comprises the step of arranging a cylindrical slag separating sieve before the primary high intensity magnetic separation. With the advantages that the iron concentrate grade and the iron recovery are high, the loss of granular iron minerals is low, the mineral process flow is short,concentrates and tailings can be obtained in advance and the energy consumption of the benefication is low, the invention can be used not only for selecting specularite ores, but also for selecting weakly magnetic iron minerals, such as hematite, goethite, siderite, limonite, and the like.

Description

technical field [0001] The invention relates to an iron ore beneficiation method, in particular to a beneficiation method for recovering specularite, which can also be used for the beneficiation of weakly magnetic iron minerals such as hematite, goethite, siderite, limonite, etc. do not. Background technique [0002] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is 32%, which is 11 percentage points lower than the world average grade. Among them, 97% of the iron ore needs to be processed, and the complex and difficult-to-select red iron ore accounts for a large proportion, accounting for about 20.8% of the iron ore reserves. [0003] Specularite belongs to a type of refractory red ore, which is a variety of hematite, associated with quartz, and its chemical composition is Fe 2 o 3 , TFe69.94%, sometimes containing TiO 2 , SiO 2 、Al 2 o 3 Wait for the mix. Its crystal structure is metallic flake-like a...

AI Technical Summary

Problems solved by technology

In the early 1960s, roasting-magnetic separation and single flotation processes were mainly used in China to process hematite ore, and the production technical indicators were poor.

Process 1 has high energy consumption and high beneficiation cost due to the fine grinding particle size

The gravity separation in process 2 and process 3 is easy to deposit in gravity separation equipment (such as spiral chute) for some specularite due to its flake mineral structure, which is not good for gravity separation effect

For fine-grained specularite, the magnetic separation effect is poor, and it is difficult to recover in the strong magnetic separation stage

In the stage of flotation operation, the above-mentioned process of separating specular iron ore has the problem of great influence of ore slime, fine-grained iron minerals are easy to enter the tailings, and the flotation index is poor.

Images