Blast furnace material loading process for realizing 3-grade or 4-grade charging of sinter ore

Abstract

The invention discloses a blast furnace material loading process for realizing 3-grade or 4-grade charging of a sinter ore, belonging to the technical field of blast-furnace iron making. The sinter ore is divided into two stages in grading by a segmentation grading manner. The first stage is the supplied material pregrading in an ore-sintering plant; and the second stage is refining grading in a blast furnace groove, thus realizing the 3-grade or 4-grade charging of the sinter ore. The process comprises the following steps: setting the charging grades as follows: I grade, II grade, III grade or IV grade, wherein, a grain size boundary between the I grade and the II grade is X, X is more than or equal to 15 and is less than or equal to 30; a grain size boundary between the II grade and the III grade is Y, wherein, Y is more than or equal to 5 and is less than or equal to 15; a III-grade minimum boundary grain size is Z, wherein, Z is more than or equal to 0 and is less than or equal to 5 or I-grade and a II-grade grain size boundary is X, wherein, X is more than or equal to 15 and is less than or equal to 30; a grain size boundary between the II grade and the III grade is Y, wherein, Y is more than or equal to 5 and is less than or equal to 15; a grain size boundary between the III grade and IV grade is W, wherein, W is more than or equal to 0 and is less than or equal to 8; and the IV-grade minimum boundary grain size is Z, wherein, Z is more than or equal to 0 and is less than or equal to 5; performing the first stage of pregrading the supplied material in the ore-sintering plant; and performing the second stage of refining grading in the blast furnace groove.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular provides a blast furnace feeding process that realizes sintered ore feeding into the furnace in three or four stages. Feeding. Background technique [0002] The technology of classifying sinter into the furnace is an important means to realize the forward and "reduced" production of the blast furnace, promote the reasonable distribution of the third air flow and improve the utilization rate of gas. [0003] With the continuous development of ironmaking technology, one of the basic ways and countermeasures to promote circular economy in blast furnace ironmaking design is "reduction" production. The so-called "reduction" means that under the condition of constant production capacity, through the adoption of technical measures, the amount of input resources and energy can be reduced as much as possible, so as to achieve the purpose of saving energy and reducing em...

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Problems solved by technology

[0009] 3. With the enlargement of the blast furnace, the sintering into the furnace in two stages can no longer meet the production needs. It is in front of us to design a blast furnace feeding system that realizes the sintering into the furnace in three (or four) stages. new question

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