Process for reducing and extracting iron from high-iron red mud

Abstract

The invention provides a process for reducing and extracting iron from high-iron red mud. The process comprises the following steps: drying the high-iron red mud, crushing the dried high-iron red mudinto particles with the particle size of less than 1 mm, and mixing the particles with a carbon-based reducing agent to prepare high-iron red mud carbon-containing pellets; adding the high-iron red mud carbon-containing pellets, pulverized coal/coke powder and calcium oxide into a rotary kiln to be subjected to reduction roasting, wherein the roasting temperature is controlled to range from 1,050DEG C to 1,250 DEG C, the roasting time is controlled to range from 90 min to 180 min, and obtaining a submerged arc furnace molten material after roasting; and adding the submerged arc furnace moltenmaterial into a submerged arc furnace to be heated, melted and reduced, wherein the melting reduction temperature is controlled to range from 1,350 DEG C to 1,550 DEG C, the time is controlled to range from 30 min to 80 min, and iron oxide in the molten material is completely reduced into metal iron. The process disclosed by the invention solves the problems of high energy consumption, low magnetic separation iron ore concentrate recovery rate, massive existence of iron-aluminum isomorphism and iron-aluminum oxide solid solutions, difficulty in iron-aluminum separation and the like in the existing red mud iron recovery process.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgical engineering, and in particular relates to a process for reducing and extracting iron from high-iron red mud. Background technique [0002] my country is a big country in the aluminum industry. The output of alumina and electrolytic aluminum accounts for more than 50% of the world's total output. It produces 30-50 million tons of red mud every year, and the accumulated stockpile has reached 350 million tons. The comprehensive utilization rate is only 4%. At present, the main methods of dealing with red mud in the world are ocean discharge and land storage, while our country mainly adopts the method of open storage. The stockpiling of red mud not only occupies a large amount of land, but also pollutes the air and soil. The infiltration of attached liquid in red mud will also cause pollution of lakes, rivers and groundwater, and destroy the ecological environment. With t...

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Problems solved by technology

[0005] The technical task of the present invention is to provide a high-iron red mud reduction and iron extraction process aimed at the above deficiencies in the prior art, which solves the problems of high energy consumption and low recovery rate of magnetic iron concentrate in the existing iron recovery process from red mud. Low and iron-aluminum isomorphism and a large number of iron-aluminum oxide solid solutions exist, and iron-aluminum is not easy to separate, etc.

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