Method for improving utilization efficiency of solid fuel and application of solid fuel in production process of sintered ore

Abstract

The invention discloses a method for improving the utilization efficiency of solid fuel and belongs to the technical field of iron making and briquetting. The difference of the method from a conventional solid fuel processing procedure is that a solid fuel winnowing device is additionally arranged on a solid fuel crushing machining procedure, solid fuel smaller than 1.0 mm is winnowed, and the solid fuel is conveyed to a blast furnace procedure to be used as blast furnace injection coal. According to the solid fuel crushing machining process, on the one hand, the grain composition of the solid fuel for sintering can be improved, the drum strength and average grain size of the sintered ore can be improved, and the sinter return rate of a blast furnace is reduced; on the other hand, the winnowed solid fuel smaller than 1 mm is used for blast furnace injection, best use is achieved, and the utilization efficiency of the solid fuel is greatly improved.

Description

technical field [0001] The invention relates to the field of metallurgical sintering, in particular to a new energy-efficient method for improving the particle size composition of the sintered ore and increasing the average particle size of the sintered ore by improving the crushing process of the solid fuel and optimizing the particle size of the sintered solid fuel during the sintering production process. Background technique [0002] In order to continuously reduce the cost of pig iron, iron and steel enterprises have been increasing the proportion of iron ore powders with large burnt losses such as limonite / siderite for many years; As well as the deterioration of its quality, the strength of sintered ore shows a decreasing trend, which is reflected in: the particle size of sintered ore becomes smaller, and the average particle size shows a trend of gradually decreasing, resulting in a large amount of sintered ore of 5-10mm under the blast furnace tank being screened out a...

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Problems solved by technology

[0002] In order to continuously reduce the cost of pig iron, iron and steel enterprises have been increasing the proportion of iron ore powders with large burnt losses such as limonite / siderite for many years; As well as the deterioration of its quality, the strength of sintered ore shows a decreasing trend, which is reflected in: the particle size of sintered ore becomes smaller, and the average particle size shows a trend of gradually decreasing, resulting in a large amount of sintered ore of 5-10mm under the blast furnace tank being screened out and becoming the surface of the blast furnace. Powder return, and due to the increase in the proportion of 5-10mm sintered ore, to a certain extent, it also affects the long-term stability of the furnace condition

[0003] The sintered ore produced in the sintering area has been transported to the blast furnace for many times, not only the proportion of the sintered ore less than 5mm has increased, but also the proportion of the 5-10mm particle size has increased significantly; in addition to the blast furnace tanks of most domestic iron and steel enterprises The lower sinter screening equipment is a high-efficiency rod sieve. After the rod sieve is screened, especially the rod sieve is near the end of its life, the sieve rod has been worn out. Not only the powder smaller than 5mm is screened out, but also the part larger than 5mm is sintered The ore is also screened out into the powder return, resulting in an increase in the powder return rate under the blast furnace tank; this phenomenon is common in iron and steel enterprises. High, and cause the waste of sintering energy and the increase of the cost of pig iron, which greatly reduces the economic benefits of the enterprise, is a problem that iron and steel enterprises urgently need to solve

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