Mineral separation process for recycling iron and rare earth in baotite oxidized ore flotation tailings

Abstract

The invention belongs to the technical field of mineral engineering, and aims to provide a mineral separation process for recycling iron and rare earth in baotite oxidized ore flotation tailings. At present, useful minerals cannot be recycled due to the fact that mineral separation difficulty of oxidized ore flotation tailings in a BaoTou steel concentrating mill is large. Three sections of ore grinding and three sections of magnetic separation are adopted, and iron ore concentrate which has the iron grade larger than 64% and the recycling rate larger than 56% is obtained from the oxidized ore flotation tailings containing 26%-33% of iron. Then total tailings in an iron recycling process serve as rare earth flotation materials, sodium polyphosphate serves as pulp dispersing agents, 2-hydroxy3-naphthyl mevalonic acid or salicylhydroxami acid and alkyl hydroximic acid in a mass ratio of 6-8:1 serve as rare earth collecting agents, water glass serves as efficient flotation combination reagents of pH regulators and inhibitor, the dispersing state of pulp micro-fine particle minerals is well controlled, the rare earth separation process with once coarse separation and three-time fine separation is adopted, and rare earth ore concentrate which has the grade larger than 58% and the recovery rate larger than 64% is obtained from feed with the 7-9% rare earth grade.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a beneficiation process for recovering iron and rare earth from oxidized ore flotation tailings of Baotou Mine. Background technique [0002] The Baiyun Obo Mine is a large-scale ore deposit dominated by iron and rare earths accompanied by polymetallic symbiosis, among which the reserves of rare earths rank first in the world. The mine is famous for its "poor", "fine" and "miscellaneous". After years of scientific research, the current beneficiation production process can only recover 70% iron and about 15% rare earth, 30% iron and 85% of rare earths are lost to tailings. The oxidized ore of Baotou Iron and Steel Concentrator is sorted to obtain iron concentrate, and the flotation tailings produced by reverse flotation of the iron concentrate are discharged into the tailings pond every year with 450,000 tons. Due to the complex composition of the tailings,...

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Problems solved by technology

The mine is famous for its "poor", "fine" and "miscellaneous". After years of scientific research, the current beneficiation production process can only recover 70% iron and about 15% rare earth, 30% iron and 85% of rare earths are lost to tailings

The oxidized ore of Baotou Iron and Steel Concentrator is sorted to obtain iron concentrate, and the flotation tailings produced by reverse flotation of the iron concentrate are discharged into the tailings pond every year with 450,000 tons. Due to the complex composition of the tailings, it mainly includes silicate , carbonate, phosphate, sulfate and other gangue minerals, iron minerals, rare earth minerals and gangue minerals are closely symbiotic in the form of dissemination or inclusions, and the particle size of iron minerals and rare earth minerals is generally less than 0.04mm, although the tail The iron content in the ore is relatively high, generally not less than 30%, and the rare earth content is between 7% and 8%. The buoyancy of iron minerals, rare earth minerals and fluorite minerals is similar, which makes it very difficult to recover iron minerals and rare earth minerals, resulting in iron and rare earth minerals in tailings that cannot be recycled.

At present, the grinding fineness of recovered fine-grained iron minerals is controlled within -325 mesh, accounting for 95%, which cannot achieve monomer dissociation for rare earth minerals and iron minerals in oxidized ore flotation tailings; The presence of mud deteriorates the process of flotation fine-grained rare earth minerals, so that rare earth minerals and gangue minerals cannot be effectively separated

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