Process for preparing hot molten iron and byproducts by utilizing red mud

Abstract

A process method for making hot molten iron and a by-product by using red mud comprises steps of: a) mixing red mud, lime, and coal; b) adding the mixture into a rotary furnace (1) for stoving and prereduction; c) a reduction material entering a flow guide groove (2), performing air injection and combustion supporting, and performing fusion and slag and iron separation, slag at an upper layer being discharged from a slag outlet (22), hot molten iron at a lower layer flowing out from an hot molten iron outlet (24); d) making cement clinker and silicon, aluminum and titanium alloy in a melting separation furnace (3) by using the slag; e) making microlite powder in the melting separation furnace (3) by using the slag; f) reclaiming superheated steam, and making a mixed liquid. The method can solve the problem that the blast furnace process cannot spit slag, greatly reduce the cost, solve the problem that the red mud occupies a large area and contaminates environment, can obtain by-products such as silicon, aluminum and titanium alloy, superheated steam, sodium salt, and microlite powder, and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a process for preparing hot molten iron and by-products from red mud. Background technique [0002] Red mud, its main components are: 5% to 25% of alumina; 30% to 55% of iron oxide; 5% to 25% of silicon oxide; 3% to 9% of sodium oxide; Titanium, magnesium oxide, calcium oxide, etc. 5% to 10%. It generally contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name; it is the polluting waste slag discharged when the aluminum industry extracts alumina, its pH value is very high, and the pH value of the leachate is 12.1-13.0. In industrial production, on average, 1 to 2 tons of red mud is produced for every ton of alumina produced. As the fourth largest producer of alumina in the world, China discharges tens of millions of tons of red mud every year, while the world produces about 70 million tons of red mud every year. A lar...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, and provide a process for utilizing red mud to produce hot molten iron and by-products, which can solve the problem of magnetic separation methods (including superconducting magnetic separation methods) in the prior art. ), re-election method or flotation method can not be selected at all, and can also solve the problem that blast furnace method "slag spit" cannot be used, so that toxic and polluted red mud can be recycled to obtain elemental iron; and zero discharge of solid pollutants can be achieved

Images