A slag washing and re-passing method and maintenance method for converter bottom blowing components

Abstract

The invention relates to a slag washing and re-passing method and maintenance method for a converter bottom-blowing element, which belongs to the technical field of steelmaking and solves the technical problem of slow slag washing and re-passing speed of the existing converter bottom-blowing element. The method for slag cleaning and reflowing of converter bottom blowing components of the present invention includes: reserving the hot slag from the previous furnace, adding molten iron; The air blowing flow rate of the bottom blowing element; add lime to cool the slag in the furnace, and pour out the mixture of cooled slag and molten iron; observe whether the bottom blowing element reconnects, if not, repeat the above steps 1 to 4. The method for maintaining the bottom-blowing components of the converter in the present application includes: when the bottom of the furnace rises and tends to be clogged, execute the high flow mode; when the bottom of the furnace falls and the bottom blowing elements are continuously exposed, execute the low-flow mode. The slag washing and re-passing method and maintenance method of the converter bottom blowing element of the present invention can realize rapid slag washing of the converter bottom blowing element.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a slag washing and reconnecting method and maintenance method for bottom blowing elements of a converter. Background technique [0002] In converter reblowing smelting, the use of bottom blowing air flow can overcome the lack of stirring ability of top blowing oxygen jet to the molten pool, make the reaction in the furnace close to balance, reduce iron loss, improve the dephosphorization effect and smelting efficiency of the converter, and reduce costs. [0003] The slag splashing furnace protection technology is widely used in our country. Although it can greatly increase the furnace life of the converter, when the slag splashing operation is performed, due to the increase in the viscosity of the slag, the fluidity is poor, and only a part of the slag is splashed by nitrogen and attached to the furnace body. , and the rest are adhered to the bottom of the furnace. As the adh...

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Problems solved by technology

[0003] The slag splashing furnace protection technology is widely used in our country. Although it can greatly increase the furnace life of the converter, when the slag splashing operation is performed, due to the increase in the viscosity of the slag, the fluidity is poor, and only a part of the slag is splashed by nitrogen and attached to the furnace body. , and the rest are adhered to the bottom of the furnace. As the adhered slag layer reaches a certain thickness, it is very easy to cause the bottom of the converter to rise. When the thickness of the slag layer at the bottom of the converter exceeds 150-200mm, the bottom blowing airflow cannot enter smoothly. The molten pool causes the gas supply of the bottom blowing components to be completely blocked or semi-blocked. The molten pool cannot get gas stirring or the bottom blowing gas escapes from the gap of the slag layer at the bottom of the furnace and cannot enter the molten pool to effectively stir the molten steel, increasing the converter smelting. Difficulty in operation and maintenance, but also bring safety hazards

[0004] In order to solve the problem of blockage of bottom blowing components, the existing technology generally adopts methods such as leaving slag alone to wash the bottom of the furnace, adding iron to wash the bottom of the furnace, or leaving steel to wash the bottom of the furnace. It is very easy to block again after a period of re-opening; use air alone as the source of blowing and blocking air, blow air into the blocked bottom blowing air supply element, and use the oxygen in the air to oxidize the "slag-metal" mushroom head, This method is only suitable when the bottom blowing element is not completely blocked, and cannot solve the problem of complete blockage of the bottom blowing element

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