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Method for eliminating schreyerite blast furnace smelting hearth center accumulation

A blast furnace smelting and vanadium-titanium ore technology, applied in the field of iron making, can solve the problems of increasing the usage of fluorite and manganese ore, the furnace condition is not effectively improved, and the waste of resources and costs, so as to improve the oxygen potential of the slag and promote the recovery of the furnace condition. , eliminate the effect of center accumulation

Active Publication Date: 2022-06-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

However, from the perspective of blast furnace production practice, large-volume (volume>1500m 3 ) blast furnace, after fluctuations in furnace conditions and accumulation in the center of the hearth occur, even if the consumption of fluorite and manganese ore is increased, the CaF in the final slag 2 It reached about 0.7%, and the MnO content reached about 3-4%. After more than 10 days of production, the furnace condition has not been effectively improved many times, resulting in a lot of resource waste and cost loss.

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  • Method for eliminating schreyerite blast furnace smelting hearth center accumulation

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preparation example Construction

[0020] The preparation method of the above-mentioned MnO-containing iron coke is to uniformly mix its raw material components according to the proportion, obtain coal cake after tamping through the tamping coke production process, and then push it into a coke oven to complete the coking process, and the coking time is 25-28h, obtaining Iron coke containing MnO, after the iron coke is released from the furnace, it is quenched by a dry quenching coke oven for blast furnace use. Because iron coke has the characteristics of low cooling and heating strength and high reactivity, it is only used in the process of furnace cleaning when it is judged that central accumulation has occurred in the blast furnace. Since in the coking process, the coking center temperature is lower than 1100 ℃, in the coking process, the iron-containing oxides in the manganese ore will undergo a direct reduction reaction with the carbon of the coal, which will increase the heat consumption. In order to make t...

Embodiment 1

[0028] A blast furnace with high-titanium vanadium titanomagnetite as the main production raw material will be scheduled for repair work on April 12, 2020 with a 580-min wind break. When the air volume returns to 80% of the normal smelting state, overhang occurs, and then the air reduction treatment is carried out. A large amount of charge without sufficient heat exchange enters the hearth, causing the furnace temperature to drop rapidly, and the airflow inside the blast furnace is further disordered. In the following week, the blast furnace A has poor wind capacity, the air volume can only recover to 70%-80%, and the blast kinetic energy is reduced from 160kJ / s to 130-140kJ / s. The continuous low air volume and low blast kinetic energy lead to accumulation in the center of the blast furnace, which is directly manifested as the continuous decrease of the temperature of the center of the furnace bottom from 580°C to 460°C. At the same time, the temperature of the secondary outer ...

Embodiment 2

[0032] B blast furnace with high-titanium vanadium titanomagnetite as the main production raw material, on July 4, 2020, because the compressive strength of the pellets entering the furnace was greatly reduced, the relationship between blast furnace air volume and air pressure was tense, and the wind capacity became poor. The air volume was reduced and the air volume was shrinking day by day. The kinetic energy of the blast was gradually reduced from 170kJ / s to 145kJ / s, and the central temperature of the bottom of the blast furnace was gradually reduced from 560 °C to 510 °C, and there was obvious central accumulation in the center of the blast furnace.

[0033] First, the batch weight and coke load of B blast furnace were reduced to 35t / batch and 3.56t / t respectively, 2% manganese-containing iron nugget was added, and the slag basicity was reduced to 1.02. The blast kinetic energy was increased to 155kJ / s, and after 10 days of smelting, the furnace condition was still not impr...

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Abstract

The invention discloses a method for eliminating schreyerite blast furnace smelting hearth center accumulation, and belongs to the technical field of ironmaking. The method for eliminating the accumulation at the center of the schreyerite blast furnace smelting hearth comprises the following steps of: mixing MnO-containing ferrocoke and top-loaded coke, loading the mixture into a furnace top charging bucket, and independently adding the mixture into the center of a blast furnace in a central coke adding manner through a blast furnace distribution chute; wherein the MnO-containing ferro-coke accounts for 20-30% of the total mass of the mixture, and the balance is the top-loading coke. By means of the method, the effect of eliminating the center accumulation in the vanadium titano-magnetite blast furnace smelting process can be effectively improved, the blast furnace is helped to rapidly improve the air permeability and liquid permeability of a stock column, blast furnace condition recovery and rapid stabilization are promoted, and the method is more effective in eliminating the center accumulation generated in the vanadium titano-magnetite blast furnace smelting process; and the method has very wide popularization and application prospects in the field of vanadium titano-magnetite blast furnace smelting.

Description

technical field [0001] The invention belongs to the technical field of iron smelting, and particularly relates to a method for eliminating central accumulation of vanadium-titanium ore blast furnace smelting hearth. Background technique [0002] In the blast furnace smelting process of vanadium-titanomagnetite, especially the high-titanium type vanadium-titanomagnetite blast furnace smelting, due to its resource characteristics, TiO2 enters the furnace. 2 High load, blast furnace slag TiO 2 The content is as high as 15-25%. In the presence of a large amount of hot coke, once a certain reaction time is given, the TiO2 in the furnace will 2 It is easily reduced to form TiC, TiN, and their solid solutions Ti(C,N) with a melting point above 2900℃, TiO 2 The overreduction reaction is easier at the interface of slag-coke contact. The formation of high melting point substances will be wrapped on the surface of coke, which will further deteriorate the gas permeability of the coke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B5/04C21B7/20
CPCC21B5/007C21B5/008C21B5/04C21B7/20Y02P10/20
Inventor 郑魁谢洪恩付卫国
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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