Self-reduction carbon-containing pellet

Abstract

The invention discloses a self-reduction carbon-containing pellet which is suitable for production of grained iron by a horizontal moving bed reduction process. The carbon-containing pellet comprises the following components of: by weight, 60-80% of an iron-containing raw material (dry basis), 10-35% of a carbon-containing raw material (dry basis), 1-5% of a binder (dry basis) and an additive. The invention is characterized in that a calcium ferrite powder is used as the additive; its dry basis content is 5-10 wt%; and C / O in the chemical components is controlled within 1.1-1.3. The self-reduction carbon-containing pellet provided by the invention will not erode refractory materials or destroy the environment, and can be used to improve melting performance of slag and produce grained iron with large granularity at the roasting temperature of 1350-1450 DEG C.

Description

technical field [0001] The invention relates to a carbon-containing pellet used for iron and steel smelting, in particular to a self-reducing carbon-containing pellet used in a horizontal moving bed reduction process. Background technique [0002] Carbon-containing pellets usually refer to a kind of iron-containing powder mixed with certain carbon (such as coal powder and coke powder, etc.) Spherical compacts containing carbon and iron. In the field of iron and steel metallurgy, different metallurgical processes have different requirements for carbon-containing pellets. In the non-blast furnace ironmaking process for the purpose of direct reduction, the carbon-containing pellets that have been publicly used generally adopt the following composition: [0003] The mass percentage of iron-containing raw materials on a dry basis is 50% to 85%, the mass percentage of carbon-containing raw materials on a dry basis is 7% to 35%, the mass percentage of a binder on a dry basis is 1...

AI Technical Summary

Problems solved by technology

[0004] In the reduction process of the existing carbon-containing pellets, a high roasting temperature (≥1450°C) is required to realize the dissolution of iron slag. The main reason is that the melting performance of slag is not good.

Although adding an appropriate amount of fluorite can improve the melting performance of slag, it will cause serious erosion of refractory materials and affect the environment