A kind of beneficiation method of using magnetite concentrate to prepare ultra-pure iron concentrate

Abstract

The invention discloses an ore dressing method for preparing ultra-pure iron concentrate by adopting magnetite concentrate, which adopts one-stage grinding-classification-one-stage weak magnetic separation, one-stage weak magnetic separation concentrate dehydration, and two-stage grinding-classification , Second-stage weak magnetic separation roughing-demagnetization-second-stage weak magnetic separation and concentration, second-stage weak magnetic separation concentrate demagnetization-concentration operation: demagnetize the obtained second-stage weak magnetic separation concentrate treatment, followed by concentration and reverse flotation operations to finally obtain TFe>72.0%, SiO 2 Ultra-pure iron concentrate with content ≤0.20%, acid insoluble matter ≤0.17%, and high-purity iron concentrate with TFe>70.7%. The collector for the reverse flotation operation of the present invention is a solution of dodecylamine and glacial acetic acid which is modified by heating according to the mass ratio of 4:1. The method of the invention has the advantages of flexible mineral processing process, stable and reliable, strong applicability, high efficiency and energy saving. The flotation reagent system is simple, the source is wide, the dosage is small, the selectivity is good, and it is very friendly to the environment and other excellent properties.

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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