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

Abstract

The invention provides a process for preparing hot molten iron and byproducts by utilizing red mud. The process comprises the following steps of: a) mixing the red mud, lime and coal; b) adding a mixture obtained in the step a) in a rotary kiln for drying and pre-reduction; c) introducing a reduced material into a diversion trench for air injection and combustion supporting, carrying out melting and slag-iron separation, discharging the slag on the upper layer from a slag outlet, and flowing the hot molten iron on the lower layer out of an hot molten iron outlet; d) preparing cement clinker and silicon-titanium-aluminum alloy from the slag in a melt separation furnace; e) preparing microlite powder from the slag in the melt separation furnace; and f) recovering superheated steam, and preparing a mixed liquid. The process has the advantages that a large amount of calcium compounds are not necessarily doped, and coke is also not necessarily used, thereby solving the problem that slag spitting is not carried out by using a blast furnace process, and greatly reducing cost; toxic red mud is recycled so as to obtain the elementary substance iron, thereby solving the problems that the red mud occupies land and pollutes environment; and the byproducts such as silicon-titanium-aluminum alloy, superheated steam, sodium salt, microlite powder and the like can also be obtained, the zero emission of solid pollutants is achieved, gas reaches the standard to be discharged and low-carbon discharge is achieved. Thus, the process provided by the invention 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