Beneficiation method for preparing ultra-pure iron ore concentrate by adopting magnetite concentrate

Abstract

The invention discloses a beneficiation method for preparing ultra-pure iron ore concentrate by adopting magnetite concentrate. First-stage ore grinding-grading-first-stage low-intensity magnetic separation, first-stage low-intensity magnetic separation concentrate concentration and dehydration, second-stage ore grinding-grading, second-stage low-intensity magnetic separation roughing-demagnetization-second-stage low-intensity magnetic separation concentration, second-stage low-intensity magnetic separation concentration concentrate demagnetization-concentration operation are separately adopted; demagnetization treatment is carried out on the obtained second-stage low-intensity magnetic separation concentration concentrate, and then concentration and reverse flotation operation are carriedout; and finally, the ultra-pure iron ore concentrate with the TFe content larger than 72.0%, the SiO<2> content smaller than or equal to 0.20% and the acid insoluble matter content smaller than or equal to 0.17% and the high-purity iron ore concentrate with the TFe content larger than 70.7% are obtained. A reverse flotation operation collecting agent is prepared by heating and modifying dodecylamine and a glacial acetic acid solution according to the mass ratio of 4: 1. The method has the advantages of flexible and variable beneficiation process flow, stability, reliability, high applicability, high efficiency and energy conservation. A flotation reagent is simple in system, raw materials are wide in source, small in dosage, good in selectivity and very environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation method for processing ultra-pure iron concentrate by using commercial-grade magnetite concentrate, especially suitable for high-quality commercial-grade magnetite with a TFe of 66.5% to 68.9%. Concentrate preparation of TFe>72.0%, SiO 2 Ultra-pure iron concentrate with content ≤0.20%. Background technique [0002] Ultra-pure iron concentrate usually requires TFe grade greater than 72.0%, SiO 2 The content of other impurities (acid insolubles) is less than 0.2%, which is an important source of raw materials for new iron-based mineral materials, and can be used to produce powder metallurgy, magnetic materials, ultra-pure iron and clean steel base materials, etc. [0003] Although my country is rich in iron ore resources, the resources suitable for processing ultra-pure iron concentrates are very limited, mainly distributed in a few ar...

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Problems solved by technology

"Modern Mining" 2016 No. 11 "Experiment on Preparation of Ultra-pure Iron Concentrate by Deep Processing of an Ordinary Iron Concentrate in Liaoning" article. Flotation purification can obtain iron grade of 71.91%, SiO 2 Ultra-pure iron concentrate with 0.23% content and 0.21% acid insoluble matter, due to the lack of stage grinding, the iron grade of the concentrate is not high

"A method for preparing ultra-pure iron concentrate powder by using ordinary grade iron ore" (CN104673993A), the iron concentrate pre-enriched by physical methods is mixed with 10-40wt% sodium hydroxide solution at a volume ratio of 1:4 reaction, the heating temperature of the material in the reactor is 160-180°C, the stirring speed is 60-120r / min, the pressure is 0.25-0.5MPa, the reaction time is 0.5-2.5h, and then filtered and washed to obtain a TFe grade of 69.0%- 71.5% ultra-pure iron concentrate powder, this process requires high equipment, which is not conducive to large-scale production, and the grade of iron concentrate is still not ideal

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