Beneficiation method for recovering high-grade iron ore concentrate from iron-containing waste rocks in waste dump

Abstract

The invention discloses a beneficiation method for recovering high-grade iron ore concentrate from iron-containing waste rocks in a waste dump. The high-grade iron ore concentrate with the TFe content larger than or equal to 65.0% is obtained through the steps of 1, raw ore stage crushing and stage dry type magnetic separation waste throwing operation, 2, fine crushing dry type pre-selection concentrate high-pressure roller grinding-wet type magnetic separation tailing throwing operation, 3, wet type magnetic separation pre-selection concentrate stage grinding-stage wet type magnetic separation operation and 4, magnetic separation concentrate anion reverse flotation operation in sequence, building material products with different lumpiness and different size fractions can be produced, and the resource utilization rate of the iron-containing waste rocks reaches up to 80%. By means of the beneficiation method, a conventional crushing-high-pressure roller milling selective disintegrating technology is adopted for pre-selecting and tailing throwing, so that the discharge amount of fine tailings is reduced, and the ore grinding amount is reduced; and a superfine grinding technology including a vertical tower mill is adopted for pre-selecting the concentrate, the number of ball-milling grinding sections is reduced, the dissociation performance of ore is improved, the particle size distribution of the ore is more uniform, the condition for obtaining the high-quality iron ore concentrate is met, and the energy-saving, consumption-reducing and emission-reducing effects are remarkable.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and specifically relates to a method for beneficiation and recycling of iron in iron-containing waste rocks in a dump site, especially suitable for the symbiosis of magnetite, iron carbonate, red and limonite, and the TFe content is 7.5 ~15.0%, in which the magnetic iron (mFe) content is 4.0~7.5%, the comprehensive recovery of iron in the iron-bearing waste rock of the dump site. Background technique [0002] Iron ore is currently included in the national strategic metal mineral resources. Foreign iron ore resources are controlled by the four major international mining oligopoly companies, which keeps the price of iron ore high. However, my country's iron ore dependence on foreign countries has been as high as 80% for a long time, which seriously restricts my country's economic development. By-products such as low-grade refractory iron ore, dump site resources, and iron-containing ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a technological process for the existing problems in the prior art, such as the large discharge of iron-containing waste rocks in the dump, the large area occupied by the dump, the low recycling rate of iron, and the high energy consumption of mineral processing. A beneficiation method for recovering high-grade iron concentrate from iron-bearing waste rocks in dumps with strong adaptability, good stability, high magnetic iron recovery rate, easy production site transformation and large-scale production, and high TFe grade in iron concentrate

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