A beneficiation method for cascaded recovery and utilization of high-sulfur magnetite concentrate

Abstract

The invention discloses a beneficiation method for the cascade recycling and utilization of high-sulfur magnetite concentrate. The high-sulfur magnetite concentrate is subjected to grinding-weak magnetic separation to obtain weak magnetic separation iron concentrate with TFe grade ≥ 64.0% and TS ≥ 10.0% , carry out one flotation sulfur roughing, one flotation sulfur beneficiation, one flotation sulfur scavenging for weak magnetic iron concentrate to obtain high iron sulfur concentrate with TS grade>24.0%, TFe grade>60.0%, and discharge flotation flotation sulfur once Tailings; the flotation sulfur tailings are fed into the open-circuit operation of flotation sulfur sweeping, respectively to obtain heavy medium products with iron grade greater than 62.5% and iron concentrates with iron grade greater than 66.5% and TS content <1.2%. The flotation process of the invention adopts the "semi-closed-semi-open" process, realizes the cascade recycling of high-sulfur magnetite concentrate, and obtains three products: iron concentrate, high-iron-sulfur concentrate and heavy medium products. The invention can not only realize the sulfur reduction of iron concentrate, but also realize the comprehensive utilization of resources, and the economic benefit, social benefit and environmental benefit are remarkable.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation method for high-sulfur magnetite concentrate, which is especially suitable for processing TFe grades between 55% and 60%, and TS content between 8% and 15%. Separation of high-sulfur magnetite concentrate with a pyrite sulfur occupancy rate of more than 86%. Background technique [0002] The high impurity sulfur content in the magnetite concentrate will directly affect the quality of ironmaking and steelmaking, and is also harmful to the blast furnace production. Therefore, the impurity sulfur content in the furnace iron concentrate should be strictly controlled, generally requiring TS<0.40%. However, for high-sulfur magnetite concentrates with a TS content between 8 and 15% (the sulfur occupancy rate of pyrrhotite is greater than 90%), it is generally required to reduce the TS content to less than 2% due to the difficulty in desulfur...

AI Technical Summary

Problems solved by technology

However, in the several flotation desulfurization methods introduced in this paper, the sulfur in the magnetite concentrate with a sulfur content of about 1.0% can only be reduced to about 0.45% through desulfurization flotation, and the sulfur in the high-sulfur iron concentrate can only be reduced to about 0.45%. The effect is not very obvious, for example, the sulfur in high-sulfur iron concentrate can only be reduced from about 20% to less than 5%

Moreover, in the prior art high-sulfur magnetite concentrate flotation desulfurization, the final product is only iron concentrate, and the sulfur in the high-sulfur magnetite concentrate is lost in vain in the tailings, which not only causes waste of resources, but also brings environmental pollution. Pollution

Not only that, the iron grade of the iron concentrate product obtained by flotation desulfurization of high-sulfur magnetite concentrate in the prior art is low, generally less than 64.5%, which is difficult to meet the market demand

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