Beneficiation method for recycling extremely-low-grade iron and fluorite resources in iron-containing surrounding rock

Abstract

The invention discloses a beneficiation method for recycling extremely-low-grade iron and fluorite resources in iron-containing surrounding rock. The beneficiation method comprises the following steps: (1) crushing raw ore, and carrying out dry magnetic separation, pre-separation and waste discarding operation; (2) carrying out high-pressure roller grinding-wet magnetic separation pre-operation on the dry-separated concentrate; (3) carrying out wet magnetic separation and pre-selection of concentrate ore stage grinding-stage wet magnetic separation operation; and (4) conducting fluorite recovery flotation operation on iron separation tailings. According to the method, the conventional crushing-high-pressure roller milling selective crushing technology is adopted for pre-selection and tailing discarding, coarse-grain tailings with the yield being nearly 60% can be discarded, the discharge amount of fine-grain tailings is greatly reduced, the ore grinding amount is remarkably reduced, the ore grinding energy consumption is reduced by 55% or above, and the energy-saving and consumption-reducing effects are remarkable. The tailings pre-selected by dry magnetic separation and the upper part of the fine screening and classifying screen are sold as building material products, the yield is up to 60% or above, and the total yield is up to 70% or above by adding high-grade iron ore concentrate and fluorite concentrate which are subsequently recycled, so that waste is turned into wealth, harm is turned into good, and an unexpected effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and specifically relates to a beneficiation method for recycling iron and fluorite resources in iron-bearing surrounding rocks. 2 It is especially suitable for comprehensive recovery of extremely low-grade iron and fluorite resources with a content of 7.0-11.0%. Background technique [0002] Iron ore and fluorspar are currently included in the national strategic mineral resources. Foreign iron ore deposits with good resource conditions have been divided up by the three major international mining oligarchy companies and the companies in the country where they are located, resulting in long-term high iron ore prices, while my country's long-term dependence on foreign iron ore has reached more than 80%, which seriously restricts my country. For economic development, how to solve key problems through mineral processing technology as soon as possible, and transform the difficult-to-sele...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the extremely low-grade iron and fluorite resources in iron-bearing surrounding rocks cannot be recovered in the prior art, and to provide a stable process flow, strong applicability, and qualified iron concentrate and fluorite resources obtained. Mineral processing method for recovery of extremely low-grade iron and fluorite resources in iron-bearing surrounding rocks of ore concentrate

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