Fettling material for converter and preparation method thereof

Abstract

The invention relates to the technical field of fireproof materials and in particular relates to a fettling material for a converter and a reparation method thereof. The fettling material is preparedfrom the following raw materials in parts by weight: 30 to 60 parts of middle-grade magnesite, 30 to 60 parts of spinel sand, 10 to 20 parts of a binding agent, 2 to 5 parts of an additive and 6 to 10parts of a wetting agent. The fettling material can be adaptive to a utilization environment with the slag basicity, which is controlled to be 0.5 to 1.0, of an iron-melting converter very well. Thelow-temperature sintering performance of the fettling material is greatly improved and the fettling material is applicable to a low-temperature utilization condition of the iron-melting converter. Thefettling material can meet the requirements of good self-flowing performance, thermal-state strength, corrosion resistance and thermal vibration resistance, and also has the advantages of short curing, capability of shortening the stopping and maintenance time of the converter and capability of improving the working efficiency; meanwhile, the fettling material is stuck with a working liner of theconverter well and does not fall off in a utilization process. The furnace age of the iron-melting converter is greatly prolonged and the economic benefits are considerable.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a repair charge for a converter and a preparation method thereof. Background technique [0002] With the arrival of winter, the north began to enter the heating period. In order to protect the environment, most blast furnaces in steel mills entered the stage of staggered peak production. The main process of converter iron melting is roughly as follows: put 50t of molten iron, scrap steel, slagging agent, and heat replenishing agent into the furnace three times, blow oxygen for about 10 minutes each time, and smelt for about 70 minutes each time. The tapping temperature is 1300-1400 ° C. At present, the basicity of the slag is controlled at 0.5-1.0, the content of MgO in the slag is 6-10%, TFe8-12%, C3-5%, and whether the iron converter is stopped or started depends on the demand for molten iron in the steel plant. [0003] At present, there is no repairing material ...

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Problems solved by technology

[0003] At present, there is no repairing material suitable for the converter iron melting process. The existing repairing materials take a long time to harden and are not well bonded to the working lining of the converter, which cannot prevent it from peeling off, resulting in a low service life of the converter.

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