Separation method of high-sulfate iron ore

Abstract

The invention discloses a separation method of high-sulfate iron ore. The method includes the following steps: firstly, performing primary ore grinding-classification on the high-sulfate iron ore, anddischarging primary classification overflow products, wherein the ore grinding particle size is controlled at -0.076mm 50%-55%; performing flotation on the primary classification overflow products, selecting sulfides, and obtaining a sulfur concentrate with a TS grade being greater than or equal to 40.0%; carrying out primary low-intensity magnetic separation on floating sulfur tailings to obtaina primary low-intensity magnetic separation iron concentrate, carrying out secondary ore grinding-classification on the primary low-intensity magnetic separation iron concentrate, and carrying out secondary low-intensity magnetic separation on secondary classification overflow products to obtain a secondary low-intensity magnetic separation iron concentrate; performing high-frequency fine screening-elutriation magnetic separation-pulsating magnetic separation and scavenging combined process on the secondary magnetic separation iron concentrate to obtain a magnetite concentrate, and removing sulfur from the sulfates to enter tailings. The scheme of the invention can effectively remove sulfur from the sulfates in the iron ore, can realize efficient separation of magnet minerals and sulfateminerals, realizes sulfur reduction of the iron concentrate, and also ensures the recovery rate of magnetic iron.

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-sulfate iron ore, which is particularly suitable for processing raw ore with a TFe grade of 30% to 40% and a TS content of 5.0% to 7.5%. Among them, the sulfur of sulfate (mainly gypsum) accounts for 30% to 50% of high-sulfur iron ore. Background technique [0002] The high content of impurity sulfur in magnetite concentrate will directly affect the quality of ironmaking and steelmaking, and is also harmful to blast furnace production. Therefore, the content of impurity sulfur in iron concentrate entering the furnace should be strictly controlled, generally requiring TS<0.30%. [0003] For the desulfurization of iron concentrates whose sulfur content is mainly sulfide (pyrite, pyrrhotite) sulfur, the method of flotation desulfurization is usually adopted, adding sulfuric acid to adjust the pH value of the pulp and clea...

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Problems solved by technology

However, the sulfur content in the iron concentrate obtained in this study is still high, and when the sulfur ratio of sulfate (mainly gypsum) in the iron ore is high, this method is difficult to meet the requirements of separation and sulfur reduction

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