Method for preparing high-purity iron oxide red from high phosphorus oolitic hematite

Abstract

The invention discloses a method for preparing high-purity iron oxide red from high phosphorus oolitic hematite. The method comprises the steps that the high-phosphorus oolitic hematite is mixed withpulverized coal to obtain a mixture, mixed ore is obtained by calcining the obtained mixture at a temperature of 1000 to 1100 DEG C for 90 to 150mins, the obtained mixed ore is ground to 74 mum occupying 90%, magnetic concentrate is obtained under magnetic field strength of 0.1 to 0.15T by magnetic separation, then 17% to 20% of sulfuric acid is mixed with the obtained magnetic concentrate according to a mass ratio of (9 to 1) to (11: 1) ml / g, a solid and liquid mixture is obtained by room temperature reaction for 25 to 35min at a stirring speed of 100 to 300 r / min; ammonia liquor is added toadjust the pH value to 5 to 5.5, and a filtrate is obtained after filtrating; the filtrate is oxidized by adding an oxidant and adding the ammonia liquor to keep the pH at 4 to precipitate, and filtering and washing are performed; obtained precipitate is calcined at 750 to 850 DEG C for 40 to 60min, and the high-purity iron oxide red is obtained. The high-phosphorus oolitic hematite is used as a raw material to prepare the high-purity iron oxide red, waste is turned into treasure; the problem that high phosphorus content of the high-phosphorus oolitic hematite affects the use is solved; the problem of high phosphorus oolitic hematite leaching is solved.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization, and in particular relates to a method for preparing high-purity iron oxide red from high-phosphorus oolitic hematite. Background technique [0002] my country has rich reserves of high phosphorus oolitic hematite, reaching 3.72 billion tons. The main iron-containing mineral of this kind of iron ore is hematite, followed by some iron combined with silicon and aluminum in the form of silicates such as oolitic chlorite. Hematite mainly exists in the oolitic concentric band structure, and the oolitic particle size is generally 0.01-0.30mm. Hematite is mostly interbedded with oolitic chlorite to form a concentric ring structure, and the oolitic nucleus is mainly quartz, followed by hematite. Apatite is the most important phosphorus mineral in this ore, and it is mainly distributed irregularly in the gaps of other gangue minerals or in the gaps of oolitic hematite particles...

AI Technical Summary

Problems solved by technology

Although high-phosphorus oolitic hematite can be leached with a variety of strong acids to obtain a higher leaching rate; however, mixed acid leaching will cause equipment corrosion and a large amount of impurities into the leachate, increasing equipment maintenance costs and leachate removal costs

The direct acid leaching after the pre-enrichment of raw ore has problems such as low iron recovery rate and adverse effects of oolitic structure on acid leaching.

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