Electricity-coal process melting and reduction ironmaking technology

Abstract

The invention relates to an electricity-coal process melting and reduction ironmaking technology. The electricity-coal process melting and reduction ironmaking technology comprises the following steps of: conveying metallized pellets produced by a gas / coal-based direct reduction device into a heat preservation storage silo of a melting and reduction furnace by utilizing a hot delivery device at the temperature of 900-1000 DEG C under non-oxidizing conditions, completing mixture making in the heat preservation storage silo, then conveying the mixture into a high-temperature area in the furnace, then heating by utilizing electric arc to melt the mixture, simultaneously spraying carbon powder to perform reduction, and then performing technological slagging off and electric arc heating melting in a circulating manner till the temperature and the ingredients of a sample achieve the standards, wherein the mixture making in the heat preservation storage silo is performed by mixing the metallized pellets, a reducing agent and slag charge according to the weight ratio of 85: 15: 5. The electricity-coal process melting and reduction ironmaking technology disclosed by the invention is designed against low-grade ores, refractory ores and complex ores, open-burning coal is used as energy, the carbon-containing metallized pellets are taken as raw materials, a final reduction technology for directly producing molten iron (or titanium refining slag and the like) is solved, and the electricity-coal process melting and reduction ironmaking technology is of a key technology for sustainable development of iron and steel industry in China, energy conservation, emission reduction and environment-friendly development.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to an electric-coal melting reduction ironmaking process. Background technique [0002] Direct reduction and smelting reduction are the mainstays of modern non-blast furnace ironmaking, both of which are cutting-edge technologies in the iron and steel industry aimed at getting rid of the dependence of blast furnace processes on coking coal. So far, many non-blast furnace ironmaking processes have been developed in the world, but there are not many industrialized processes. Even the industrialized or preliminary industrialized COREX, FINEX and other methods have problems in their process and production process design. The existing technology and production equipment of direct reduced iron, such as rotary hearth furnace, shaft furnace, rotary kiln, fluidized bed, etc., can be used not only as a pre-reduction unit for smelting reduction, but also as a production equipmen...

AI Technical Summary

Problems solved by technology

[0004] However, according to the imported COREX (C-3000) smelting reduction technology and equipment that has been put into production and operation, its biggest feature compared with the traditional blast furnace process is that it can use less coke, but it has not yet achieved no coke production. Failed to achieve expected goals in terms of production capacity, energy consumption, operating rate, molten iron cost, etc.