Process for recovering iron and rare earth in baotite low-intensity magnetic separation tailings

Abstract

The invention belongs to the technical field of mineral engineering and aims at providing a process for recovering iron and rare earth in baotite low-intensity magnetic separation tailings. Iron content in the tailings in the existing technological process of a bayan obo iron mine is about 13% ordinarily, dissemination particles of iron minerals are fine, and the recovering difficulty of the iron minerals in the tailings is caused. The rare earth content is 7%-8% ordinarily, so that the rare earth resource recovering value exists. Rare earth concentrate is obtained from the low-intensity magnetic separation tailings in the existing technological process by adopting a rare earth separation process including primary roughing and a tertiary roughing. Rare earth tailings and middlings 1 in the rare earth recovering process serve as raw materials for recovering the iron minerals, and the raw materials are mixed and grinded to be 96-97% of -325 meshes and then are subjected to magnetic separation at the magnetic field intensity of 600-650kA/m. Magnetic separation rough concentrate serves as iron flotation feeds, ammonium fluosilicate is used as an inhibitor and a potential of hydrogen (pH) regulator, and oxidized paraffin soap and alkyl hydroximic acid with the mass ratio of 8-10:1 serve as collecting agents to perform direct iron flotation to obtain iron ore concentrate.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a recovery process for iron and rare earths in weak magnetic separation tailings of Baotou Mine. Background technique [0002] Baiyun Obo Iron Mine is currently using weak magnetic separation-reverse flotation beneficiation process to recover magnetite minerals. The weak magnetic separation tailings produced during the process generally contain about 13% iron, and the iron minerals in it have a very fine particle size and are closely symbiotic with gangue minerals such as iron-containing silicates and carbonates, resulting in tailings The secondary recovery of medium iron minerals is difficult, and has not been recovered so far. The rare earth content is relatively high, generally between 7% and 8%. At present, only the rare earth minerals in the overflow are recovered through classification operations, and most of the rare earth minerals in the coarser pa...

AI Technical Summary

Problems solved by technology

The weak magnetic separation tailings produced during the process generally contain about 13% iron, and the iron minerals in it have a very fine particle size and are closely symbiotic with gangue minerals such as iron-containing silicates and carbonates, resulting in tailings The secondary recovery of iron minerals is quite difficult, and has not been recovered so far

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