Method for preparing carbon-containing pellet for blast furnace

Abstract

The invention discloses a method for preparing a carbon-containing pellet for a blast furnace, belonging to the technical field of carbon-containing pellets. The method comprises the steps of (1) weighing 11-13 parts of sintering machine head electric fly ash, 38-42 parts of blast sludge, 20-22 parts of stokehole bunker fly ash, 17-19 parts of calcium-free chromium slag, 10-12 parts of vanadium-titanium magnetite concentrate, 3-5 parts of zirconium oxide, 1-2 parts of bentonite and 1 part of slaked lime in parts by weight, and respectively grinding the sintering machine head electric fly ash, the blast sludge, the blast sludge and the calcium-free chromium slag into fine powder of 120-200 meshes; (2) mixing the materials, gradually adding into a disc-type granulator to prepare the carbon-containing pellet; and (3) adding the carbon-containing pellet of the step (2) into a rotary hearth furnace for reducing. As the sintering machine head electric fly ash, the blast sludge, the blast sludge and the calcium-free chromium slag are used as pellet components, the production cost of the carbon-containing pellet is greatly reduced, and the mechanical property is good.

Description

technical field [0001] The invention relates to the technical field of carbon-containing pellets, in particular to a method for preparing carbon-containing pellets for blast furnaces. Background technique [0002] The increasing shortage of coal resources for coking is a bottleneck for the sustainable development of the traditional blast furnace ironmaking method that relies too much on high-quality coking coal. The pre-reduced metallized pellet produced by the coal-based direct reduction method is an effective measure to reduce this dependence. Those with a metallization rate of 80-90% or more are called metallized pellets. When the metallization rate reaches 30-80%, it is called semi-metallized pellets. [0003] According to the practice of using metallized pellets in blast furnaces in the United States and Japan, it is shown that for every 10% increase in the metallization rate of pellets, the coke ratio can be reduced by 4~6%, and the output can be increased by 5~7%. ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of low utilization rate of carbon-containing pellets in the iron and steel plant and high production cost in the prior art, and provides a method for preparing carbon-containing pellets for blast furnaces. The carbon-containing pellets prepared by the present invention can recycle and recycle the electric dust of the sintering machine head, the blast furnace gas mud, the dust removal dust of the mine tank in front of the furnace and the calcium-free chromium slag