The method of cleaning the blast furnace before shutting down

A blast furnace and furnace washing technology, which is applied to the field of blast furnace iron-making empty material line shutdown, can solve the problem of unclean furnace walls, prolonged blast furnace shutdown time, and long processing time of furnace wall adhesions and hearth deposits, etc. problems, to achieve the effect of saving blast furnace shutdown time, improving fluidity, and shortening cleaning time
CN111676334BActive Publication Date: 2022-04-12SGIS SONGSHAN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SGIS SONGSHAN CO LTD
Publication Date
2022-04-12

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Abstract

The application provides a method for cleaning a blast furnace before shutting down, and belongs to the technical field of shutting down an empty material line for blast furnace ironmaking. The method of washing the blast furnace before shutting down includes distributing cloth in the throat of the blast furnace, and then performing furnace washing and smelting. The standards for the furnace washing and smelting steps include: the edge temperature is 250-300°C, and the molten iron temperature is ≥1480°C. Through the step of distributing materials, in the step of furnace washing and smelting: in the slag, R is 1.05-1.16, the content of MgO is 8.0-9.0wt%, and the content of Al 2 o 3 The content of Si is ≤15.0wt%; in molten iron, the content of Si is 0.60-0.90wt%, the content of S is 0.025-0.045wt%, and the content of Mn is 0.50-0.80wt%. It can shorten the cleaning time of the furnace wall and the furnace hearth, and effectively save the shutdown time of the blast furnace.
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Description

technical field

[0001] The present application relates to the technical field of shutting down an empty material line for blast furnace ironmaking, and in particular, relates to a method for cleaning a blast furnace before shutting down. Background technique

[0002] At present, the large and medium maintenance of the blast furnace generally adopts the method of stopping the furnace with an empty material line. First, it can create convenient conditions for the large and medium maintenance and realize a safe and smooth shutdown; downtime.

[0003] In the prior art, the furnace wall is not clean after shutdown using the empty material line shutdown method, and there are still many places on the furnace wall with adhesives, and there are accumulations in the hearth. It takes a long time to process the material and hearth accumulation, which prolongs the shutdown time of the blast furnace. Contents of the invention

[0004] The purpose of this application is to provide a me...

Claims

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