Maintaining method of converter lining

Abstract

The invention relates to a maintaining method of a converter lining. The maintaining method comprises the steps that: slag splashing furnace maintenance operation is carried out twice, spray repairing operation is carried out once between the slag splashing furnace maintenance operations, and the time of slag splashing and spray repairing is controlled, thus the slag splashing and spray repairing effects are improved. Namely, when tapping of a converter is finished, the first slag splashing operation is directly carried out, the slag is uniformly splashed on the surface of a furnace lining by adjusting the position of a nitrogen gun; then spray repairing is rapidly carried out on the weak parts of the furnace lining; and after spray repairing is finished, the second slag splashing operation is carried out, and the slag is subjected to upgrading treatment according to the actual state of the slag. According to the invention, spray repairing is carried out between the slag splashing operations, thus the high-temperature slag is easily splashed and attached to the surface of the furnace lining, the problem of falling of the spray repairing material due to over-thick newly formed slag splashed layer is prevented, a new slag splashed layer is ensured to be formed outside the spray repairing material, direct contact between the spray repairing material and the steel slag is effectively avoided, the slag splashing furnace maintenance and spray repairing effects are significantly improved, and the converter life is extremely prolongrd.

Description

Technical field [0001] The invention belongs to the technical field of converter maintenance technology, and in particular relates to a converter lining maintenance method that adopts a combination of slag splash protection and gunning operations. Background technique [0002] Slag splashing and gunning are two different process technologies for converter lining maintenance. Slag splash protection is to use high-pressure nitrogen to splash the slag with high MgO content on the furnace lining after the converter is tapped to protect the furnace lining. The gunning process is to spray the gunning material on the surface of the furnace lining through a spray gun to protect the furnace lining. [0003] In the actual production process, it was found that the gunning process was adopted after the slag splashing to protect the furnace, and the protection effect after gunning was not ideal, and the gunning material was very easy to fall off. The reason is that after the process of slag s...

AI Technical Summary

Problems solved by technology

[0003] In the actual production process, it was found that the gunning process was adopted after slag splashing to protect the furnace, the protection effect after gunning was not ideal, and the gunning material was easy to fall off

The reason is that after the slag splashing furnace protection process is completed, a large amount of slag splashed on the weak part of the furnace lining, that is, the part that needs to be sprayed, remains. Due to the short attachment time, this part of the slag has not been completely sintered with the slag splash layer on the lining surface. Therefore, gunning is carried out on this part of the slag surface, and the gunning material is easy to fall off with the slag splashing layer falling off, resulting in poor gunning effect

If gunning is performed directly without slag splashing to protect the furnace, although the gunning effect is relatively good, the slag splashing effect will be poor due to the sacrifice of the best slag splashing timing, even if the slag splashing furnace protection operation is no longer performed at this time , the gunning material will directly contact the steel slag when it is smelted in the next furnace, and it is easy to fall off and has no protective effect

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