Mineral separation method for recycling iron, rare earth, fluorite and niobium from iron tailings of associated multi-metal minerals

Abstract

The invention relates to a mineral separation method for recycling iron, rare earth, fluorite and niobium from iron tailings of associated multi-metal minerals, and belongs to the fields of mineral process engineering and comprehensive recycling of resources. The mineral separation method for recycling iron, rare earth, fluorite and niobium from iron tailings of associated multi-metal minerals comprises the following steps: carrying out low intensity magnetic separation and high intensity magnetic separation pre-concentration by taking bayan obo tailings as raw materials, then carrying out fluid bed roasting on obtained pre-concentrated concentrates, and carrying out low intensity magnetic separation operation on roasted minerals obtained by roasting so as to obtain weak-magnetism concentrates and rare-earth-containing weak-magnetism tailings; and carrying out rare earth flotation operation on the weak-magnetism tailings to obtain rare earth flotation concentrates and rare earth flotation tailings finally, then carrying out acid leaching process on the rare earth flotation tailings to obtain niobium-enriched slag and acid pickling tailings, and meanwhile, carrying out fluorite flotation operation on pre-concentrated strong-magnetism tailings to obtain fluorite flotation concentrates and fluorite flotation tailings. By the method, fluorite concentrates, iron core concentrates, rare earth concentrates and the niobium-enriched slag are obtained finally, and thus, the bayan obo tailings are utilized comprehensively.

Description

technical field [0001] The invention relates to a beneficiation method for recovering iron, rare earth, fluorite and niobium from iron tailings of associated polymetallic minerals, and belongs to the field of mineral processing engineering and resource comprehensive recovery and utilization. Background technique [0002] Baiyun Obo Iron Mine is a representative of associated polymetallic ore, which is rich in rare earth, iron, niobium, fluorite and other minerals, and is a large comprehensive deposit. At present, the utilization of Baiyan Obo Iron Mine is limited to the recovery of iron and rare earths, and the recovery rate of iron is only about 75%, and the recovery rate of rare earths is less than 30%. Other minerals are regarded as gangue piles and stored in tailings ponds. cause waste of resources. According to the data, the content of rare earth ore in the tailings of Baiyun Obo is about 7%, the content of iron mineral is about 15%, and the content of fluorite is abou...

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Problems solved by technology

At present, the utilization of Baiyan Obo Iron Mine is limited to the recovery of iron and rare earths, and the recovery rate of iron is only about 75%, and the recovery rate of rare earths is less than 30%. Other minerals are regarded as gangue piles and stored in tailings ponds. cause waste of resources

[0003] Baiyan Obo Iron Mine, as a polymetallic (associated) ore, has become a representative of refractory minerals due to its complex mineral types and complex metasomatism. The useful minerals and gangue minerals in its tailings have relatively high magnetic properties and specific gravity buoyancy. Therefore, it brings great difficulties to the research on the comprehensive utilization of Baiyun Obo Iron Mine.

Baiyun Obo Iron Mine currently adopts the "weak magnetic-strong magnetic-flotation" process to recover iron and rare earths. In view of the low recovery rate of weak magnetic iron minerals and rare earth minerals in the tailings of strong magnetic separation during production operations

Part of the weak magnetic iron minerals and most of the rare earth minerals enter the tailings, and because the rare earth flotation tailings slurry contains a large amount of chemicals, which affects the further separation of minerals such as fluorite, so the iron, rare earth, fluorite, niobium in the tailings Comprehensive utilization faces many difficulties

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