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A converter lining and converter technology, applied in the field of converter lining maintenance, can solve the problems of delamination, weak connection, unsatisfactory actual effect, etc.
Inactive Publication Date: 2017-02-01
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology
In order to reduce the production cost, the method of repairing the furnace with pig iron blocks was adopted in the follow-up, which reduced the consumption of repairing materials. However, when repairing the fu
Method used
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Embodiment 1
[0036] A maintenance method for a converter lining, comprising the following steps:
[0037] 1) Prepare 2.5t dry and clean iron nuggets in advance, the iron nuggets are iron nuggets for normal production of steelmaking, the mass percentage of carbon in the iron nuggets is 3.5%%;
[0038] 2) Control the blowing end point of the previous furnace: the temperature at the end point of molten steel blowing is controlled at 1680°C, and the oxygen at the end point of molten steel is below 700ppm;
[0039] Ensure that the fluidity of the final slag is good, the MgO in the slag is above 8%, the TFe content is not higher than 20.2%, and the basicity of the final slag is greater than 2.8;
[0040] 3) Shake the converter to the charging position directly without performing slag splashing to protect the furnace after tapping, and shake the converter to an appropriate position according to the specific parts that need to be maintained: when the molten pool needs to be maintained or the posit...
Embodiment 2
[0049] A maintenance method for a converter lining, comprising the following steps:
[0050] 1) Prepare 2.5t dry and clean iron nuggets in advance, the iron nuggets are iron nuggets for normal production of steelmaking, the mass percentage of carbon in the iron nuggets is 4.5%;
[0051] 2) Control the blowing end point of the previous furnace: the temperature at the end point of molten steel blowing is controlled at 1640°C, and the oxygen at the end point of molten steel is below 700ppm;
[0052] Ensure that the fluidity of the final slag is good, the MgO in the slag is above 8%, the TFe content is not higher than 20.2%, and the basicity of the final slag is greater than 2.8;
[0053] 3) Shake the converter to the charging position directly without performing slag splashing to protect the furnace after tapping, and shake the converter to an appropriate position according to the specific parts that need to be maintained: when the molten pool needs to be maintained or the position...
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Abstract
The invention provides a maintenance method of a converter lining. According to the maintenance method of the converter lining, slag repair is conducted on a damaged lining through iron blocks with the carbon content being 3.5%-4.5%, and carbon in the iron blocks and slag perform a deoxidation reaction, so that the oxygen content of the slag is reduced; additionally, the iron blocks have the heat absorption function, so that the low-oxidizability high-refractoriness slag is made to rapidly adhere to the peripheries of the iron blocks; a generated splashed slag layer and a combination face of a foundational lining perform a metallurgical reaction, and the connection between the splashed slag layer and the combination face of the foundational lining is metallurgical bonding connection, so that the bonding force is larger, combination is tighter, an obvious layered phenomenon is avoided, and the fettling effect is improved; iron block fettling is conducted 1-2 times per shift, the deslagging face of a converter is basically not fettled with a fettling material any more so that the consumption of the fettling material can be reduced by 50% or above, the converter shutdown time of per shift is shortened by about 40 min, and the production stability is greatly improved; and after slag splashing of the iron blocks, the splashed slag layer can be kept for five batches or above, and the maintenance effect is even better than that of fettling adopting the fettling materials.
Description
technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for maintaining the lining of a converter. Background technique [0002] Since the converter slag splashing protection technology was widely used, the furnace life of the converter has been greatly increased, reaching an average of more than 13,000 furnaces. However, the erosion of the furnace lining is uneven, especially the slag pouring surface, which is not only affected by the chemical erosion of molten steel, slag, and furnace gas, and the impact of rapid cooling and heating of the furnace lining, resulting in refractory bricks peeling off, but also by the erosion of molten iron when mixing molten iron and mechanical impact when adding scrap steel. , is the key maintenance part of the furnace lining. [0003] In order to ensure the safe operation of the furnace lining, it is generally adopted to increase the frequency of furnace repairing on the slag ...
Claims
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Application Information
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