New charging method of schreyerite smelting blast furnace

Abstract

The invention provides a new charging method of a schreyerite smelting blast furnace. The double ring burden distribution of ores and coke in a 430m<3> blast furnace is characterized in that ores of each batch are added at two angles, then coke is added at two angles, and finally center coke is added, wherein the ore and coke burden distribution alpha angles are 27DEG and 33DEG, and an angle difference alphadelta is fixedly controlled at 6DEG; and after the double ring charging of the ores and coke is carried out five times, the center coke is added, the addition amount of the center coke accounts for 1 / 5 of the total amount of coke added in the five-time charging, and the center coke is added with the alpha angle of 16DEG and a beta angle rotating for 2-3 rings. The ores, coke and the center coke of the blast furnace are weighed and screened, are added to a truck, are sent to a furnace roof distributing device, and finally are added to the blast furnace.

Description

technical field [0001] The invention relates to blast furnace smelting technology, especially suitable for smelting vanadium-titanium ore. The method plays a decisive role in the output and coke ratio of the blast furnace. Background technique [0002] Blast furnace distribution refers to the distribution of charge (ore and coke) in blast furnace throat during blast furnace ironmaking process. The basic law of blast furnace distribution is an important part of blast furnace smelting process theory. Controlling blast furnace distribution is an important means of blast furnace operation. Call it "upper adjustment". Usually, blast furnace charges are loaded into blast furnace throat in batches. The amount of ore in a batch determined based on experience and the amount of coke determined in accordance with the coke load form a batch, which is loaded into the throat through double bells or rotary distributors of material distribution equipment. From the longitudinal section of t...

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Problems solved by technology

[0003] The principle of the blast furnace material distribution method is to ensure the reasonable distribution of gas, to fully heat and chemical energy of the gas, and to ensure the smooth operation of the blast furnace. Under the conditions of vanadium-titanium ore smelting, the smooth operation of the blast furnace is particularly important. Gas utilization plays a key role, that is, it plays a decisive role in the technical and economic indicators of the blast furnace, output, and coke ratio. However, the above charging system and the simple multi-ring distribution method have their limitations in the production process of vanadium-titanium ore. For example, it is difficult to adjust the gas flow, the central gas flow is not developed enough, the hearth is not evenly active, the cooling wall is easy to burn out, and the CO in the gas 2 The content is low. After the blast furnace was repaired and shut down, it was found that the elephant foot of the hearth was seriously eroded, indicating that the air flow in the center was not smooth. The original distribution method used in vanadium-titanium ore smelting could no longer adapt to the existing raw material conditions.

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