Method for reducing high-density metallized pellet

Abstract

The invention relates to a method for reducing a high-density metallized pellet, belonging to the technical field of metallurgy. The method comprises the following steps: (1) preparing a pellet by proportionally and uniformly mixing iron ore powder to be reduced, carbon powder to be contained and a bonding agent; (2) preparing a material to be reduced by proportionally mixing the pellet and a reducer; (3) putting the material to be reduced into a reduction container, then transferring into a reduction kiln, and performing reduction reaction at 1220-1260 DEG C for 6-8 hours; and (4) after the reaction, naturally cooling the material in a kiln car to 200 DEG C, separating the reducer tailing and the metal pellet, performing surface sanding, and cleaning to obtain the high-density metallized pellet product of which the density is 3.8-4.2 t / m<3>. According to the method provided by the invention, the original kiln reduction operation is not changed, the reduced iron does not need to be crushed and subjected to cold briquetting, the production cost can be lowered, the energy consumption can be reduced, the steel making application is facilitated, the production process is stable, and the metallization rate is improved. Thus, the method provided by the invention has favorable application prospects.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, in particular to a method for reducing high-density metallized pellets. Background technique

[0002] At present, the total annual reduced iron (sponge iron, metallized pellets) in China is about 500,000 tons, accounting for less than 0.8% of the world's total output. China's coal-based direct reduction production process mainly adopts the coal-based tunnel kiln-tank method, and there are also a small amount of coal-based rotary kiln method and coal-based shaft furnace method. Among them, only the coal-based tunnel kiln-tank method is relatively stable and mature. Item distribution is relatively common.

[0003] The coal-based tunnel kiln tank method has the problems of large investment and large floor area, and expensive refractory tanks must be used; due to backward technology, high energy consumption, long reduction time, and high labor consumption, the product needs to be cold-pressed int...