Method for treating high-iron red mud with high-temperature iron bath

Abstract

The invention provides a method for treating high-iron red mud with a high-temperature iron bath. The method comprises the following steps of mixing high-iron red mud, a carbon-containing raw material and an additive uniformly according to 4-10wt% of additive and a mole ratio of the content of fixed carbon in the carbon-containing raw material to the total content of oxygen elements in iron oxide and sodium oxide in the used high-iron red mud being C / O=1.1-1.4 to prepare red mud agglomerates; during blast-furnace tapping, adding the red mud agglomerates to molten iron according to the addition not more than 50kg / t and carrying out quick smelting reduction on metals in the red mud by utilizing the high-temperature iron bath environment and the impact and stirring actions of the molten iron, wherein iron is smelted in the high-temperature molten iron after reduction to be supplied for steelmaking; the alkali metals are discharged along with smoke after reduction; aluminium oxide and impurities are smelted in furnace slag and float on the surface of the molten iron. The method is simple, convenient and practicable, dispenses with adding special devices or equipment, can be used for efficiently separating iron, aluminium and alkali metals in the red mud, ensures that the iron recovery rate is more than 90%, not only achieves large-scale comprehensive utilization of the high-iron red mud but also reduces the environmental and safety problems caused by the red mud and obtains the double effects of energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the field of metallurgical comprehensive utilization, and in particular relates to a method for treating high-iron red mud by using a high-temperature iron bath. Background technique [0002] Red mud is the solid waste discharged during the alumina production process in the alumina plant. Generally, 0.8-1.8 tons of red mud is produced for every 1 ton of alumina produced. More than 100 million tons, not only occupy a large amount of land, but also cause environmental pollution and safety hazards. Red mud contains more valuable elements such as iron and aluminum, especially the red mud that is discharged after the Bayer method is used to produce alumina generally has a high iron content (Fe 2 o 3 content of 30% to 70%), so the recycling value of this kind of high-iron red mud is extremely high. The first choice is to recycle the iron in it. Effective treatment of high-iron red mud can not only reduce the pressure on environment...

AI Technical Summary

Problems solved by technology

[0004] Most of the current high iron red mud treatment methods need to add special devices or equipment, and there are many steps in the process, which complicates the process operation; or strict control conditions, high energy consumption, and low recovery rate lead to increased costs, making it difficult to achieve large-scale industrial production. application