Mineral separation process for recycling iron and rare earth in baotite magnetite 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 magnetite flotation tailings. Three sections of ore grinding and three sections of magnetic separation are adopted, and iron ore concentrate which contains more than 63% of iron and has the recycling rate larger than 72% is obtained from the magnetite flotation tailings containing 28%-32% of iron. Then total tailings in an iron recycling process serve as rare earth flotation materials, sodium polyphosphate or sodium hexametaphosphate 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, rare earth ore concentrate which contains more than 53% of rare earth and has the recovery rate larger than 47% is obtained from the tailings containing 5-7% of rare earth, and effective separation of rare earth minerals and gangue minerals is achieved.

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 magnetite flotation tailings of Baotou Mine. Background technique [0002] Baotou 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 ore is a refractory ore, and the current beneficiation process only recovers about 70% of the iron and 15% of the rare earth, and about 30% of the iron and 85% of the rare earth are lost to the tailings. The flotation tailings produced by the reverse flotation of the iron concentrate obtained by weak magnetic separation of magnetite in Baotou Mine are about 270,000 tons per year, which contain about 30% iron and about 6% rare earth. The tailings mainly include iron Minerals, rare earth minerals, apatite, sodium pyroxene, sodium amphibole, c...

AI Technical Summary

Problems solved by technology

Among them, the iron minerals are mainly fine particles, mostly between 0.01mm and 0.04mm, which are in the form of dissemination or inclusions and closely coexist with rare earth minerals, sodium pyroxene, sodium amphibole, carbonate and other minerals. The recovery of some iron minerals adopts the grinding fineness of -325 mesh, which accounts for about 80%. The recovery of iron minerals through magnetic separation cannot dissociate most of the monomers of iron minerals, resulting in a very low recovery rate of iron. to 40%; rare earth minerals are mostly in the form of fine particles wrapped in gangue, sodium pyroxene, sodium amphibole, and iron minerals. The buoyancy of salt and iron minerals, rare earth minerals and gangue minerals is similar, which makes the beneficiation of rare earth minerals very difficult. Since the separation of iron silicate and iron minerals, rare earth minerals and gangue minerals cannot be solved, rare earth minerals has never been recycled

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