Production method of bilayer structure pellet and production equipment thereof

Abstract

The invention discloses a production method of a bilayer structure pellet and production equipment thereof, belongs to the technical field of pellet production methods and equipment, and is used for producing a pellet having an inner-layer structure and an outer-layer structure. The technical scheme is that a mineral aggregate easy to generate an adverse effect on the pelletizing process and the roasting process is put in an inner-layer pelletizing disk to serve as a pellet core, and a mineral aggregate with good pelletizing performance and in favor of roasting is put in an outer-layer pelletizing disk to grow to a pellet, so that the pellet with the inner-layer structure and the outer-layer structure is formed, and the influence on the pellet by the adverse effect of the mineral aggregate is prevented. The method and the production equipment are simple in operation, are flexible in parameter adjustment, and can be adapted to a diversified raw material structure; under the condition of shortage of a high-quality iron ore resource at present, the novel production method and the novel production equipment are provided to realize reasonable resource utilization, to improve pellet quality and to guarantee smooth production; and the production method and the production equipment have positive and prominent effects on the sustainable development and the economic benefit improvement of iron and steel enterprises, and have strong promotion and application values.

Description

technical field [0001] The invention relates to a pellet production method and equipment, in particular to a method and special production equipment capable of continuously producing pellets with an inner and outer two-layer structure, and belongs to the technical field of pellet production methods and equipment. Background technique [0002] Pellet ore is one of the main iron-containing raw materials in blast furnace production. Compared with sinter, pellet ore has a small and uniform particle size, which is conducive to improving the air permeability of the upper material layer of the blast furnace and making the material layer more uniform and reasonable; It has the advantages of regular shape, specific surface area much higher than that of sintered ore, high iron grade, large heap specificity, high degree of reduction, good thermal strength, good utilization of gas, and development of indirect reduction. It is an ideal metallurgical charge. In terms of production pro...

AI Technical Summary

Problems solved by technology

[0003] The pellet production process requires high-grade iron ore powder, fine particle size, and easy pelletizing. However, the current situation of iron and steel mineral resources is very good. Poor, lower grade, SiO 2 Facing such raw material conditions, the phenomenon of fluctuations in the quality of pellets in actual production continues to increase, and the problem of ring formation in rotary kilns It is also becoming more and more prominent. Under the existing process conditions, it is becoming more and more difficult to optimize the structure of raw materials to maintain stable pellet quality.

Images