Blast furnace blowing-in burdening method

Abstract

The invention provides a blast furnace blowing-in burdening method. A blast furnace normal material is divided into at least eight segments, and batch weights of ore at all the segments are unfixed but the batch weights of coke at all the segments are fixed on condition that alkalinities and Al2O3 balances of all the segments are guaranteed; the ratio between agglomerate and pellet ore in the ore is fixed as needed, different coke loads which are adopted by the coke ratio from the top down are determined according to a preset coke ratio of each segment, the content of mixed ore in each batch material is adjusted according to the content of MgO in slag, and the batch number of the material of each segment is adjusted according to the charging volume, the total coke ratio and the total final slag alkalinity. The practical charging stockline is guaranteed to be same as a stockline obtained through calculation, the coke ratio gradient is refined, and the ratio of all components in the slag is adjusted and controlled by the mixed ore, so the furnace man labor intensity is greatly reduced, the accident probability is reduced, the blast furnace production go smoothly, and the material slipping and hanging phenomenon is reduced, thereby the blast furnace blowing-in production target reaching time is greatly shortened, and the method has obvious economic benefits.

Description

Technical field [0001] The invention belongs to the technical field of blast furnace charging and batching technology, and in particular relates to a furnace charging and batching method used when a newly built blast furnace is opened. Background technique [0002] Whether the newly-built blast furnace can be started smoothly has a great impact on all aspects, and whether the batching method and calculation method of the starting material are reasonable or not has a great influence on the blast furnace to start up and reach production smoothly. At present, the widely used blast furnace batching method in China is to divide the normal material into two sections, and divide the blast furnace into 6 sections from the bottom to the top. The first section is the bottom material, which is the net coke bottom; the second section is the sleeper, which is filled to the center line of the tuyere; the third section is the net coke, and the filling volume is calculated from the bottom materi...

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Problems solved by technology

[0004] 2. The ore batch weight of normal materials is fixed, but the coke batch weight is divided into two parts. This calculation method does not match the ore batch weight in the blast furnace during actual production.

[0005] 3. The calculation method of raw materials generally does not use miscellaneous ores except manganese ore, so it cannot form a reasonable furnace charge structure, which is not conducive to furnace recovery

[0006] 4. The calculation method of raw ingredients does not control the slag ratio, does not control the proportion of each component in the slag, only controls the binary alkalinity of the final slag

When starting the furnace through this batching method, because the amount of slag formed is small, it is not conducive to heating the hearth at the initial stage of furnace opening; the composition of the formed slag is extremely unreasonable, high viscosity, and extremely poor fluidity, which is not conducive to the separation of slag and iron at the initial stage of furnace opening And slag and iron discharge, which is extremely unfavorable to the smooth start-up and rapid production of blast furnaces

[0007] 5. Calculation method of raw ingredients The sleepers do not calculate the volume, and the sleepers actually occupy the volume of the hearth when the furnace is actually turned on and charged before being ignited to supply air. Verify the error between the charge volume and the calculated volume

[0008] 6. Once the calculation method of raw ingredients is started, no adjustments can be made even if other situations occur

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