Furnace lining maintenance process for furnace front pig iron slag repairing and patching combined furnace protection

A technology of pig iron and slag supplementation, which is applied in the manufacture of converters, etc., can solve the problems of poor fluidity, small quantity, and insufficient sintering temperature of large fabrics, and achieve the effects of fast recovery speed, improved subsidy effect, and improved furnace lining safety

Inactive Publication Date: 2020-06-30
XINJIANG BAYI IRON & STEEL
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a furnace lining maintenance process combining pig iron slag repair and sub

Method used

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Experimental program
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Embodiment Construction

[0007] After summarizing the production experience of converter repair materials in the refractory plant, in order not to increase the repair cost, the converter operation area has made technical improvements in the following four aspects for the maintenance of the large front face and the slag line on both sides.

[0008] A furnace lining maintenance process combining pig iron slag supplementation and supplementation in front of the furnace to protect the furnace:

[0009] (1) The large surface in front of the furnace is changed from pouring large fabric to pig iron slag. As we all know, MS-88 sintered magnesia is used as raw material for repairing furnace, and high-temperature asphalt is used as binder. Due to the low MgO content of the main raw material, the loose structure, low volume density and high porosity of this kind of repairing material, the repairing material has poor resistance to high-temperature molten steel erosion and slag erosion, and its service time is sho...

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Abstract

The invention discloses a furnace lining maintenance process for furnace front pig iron slag repairing and patching combined furnace protection. The furnace lining maintenance process comprises the following steps that (1), for a furnace front large surface, large surface material pour repairing is replaced with pig iron slag repairing; (2), each class performs pig iron slag repairing for 2-3 times by utilizing equal-rhythm time, a furnace repairing plan is arranged according to measurement data for each class, pig iron slag repairing operation is performed for 2-3 times in front of the furnace before furnace patching, 2 tons of pig iron blocks are directly poured in front of the furnace after tapping by utilizing equal-stop time, then the furnace body is shaken to 90 DEG C, standing is performed for 5 minutes and slag splashing is performed, furnace slag is not prone to being splashed dry, certain fluidity is guaranteed, the furnace body is shaken to 90 degrees after slag splashing, patching operation is started, patching can be conducted for 1-2 t according to needs, and patch materials are burnt out through enough heat in the furnace; (3), oxygen is supplied by adopting a tubular oxygen lance according to the content of asphalt and tar in the patch materials; and (4), after the patch materials are burnt out, spray repairing operation can be performed.

Description

technical field [0001] The invention relates to a furnace lining maintenance process for furnace front pig iron slag supplementation and subsidy combined with furnace protection. Background technique [0002] The Second Steelmaking Plant currently has three 120t converters with an annual output of about 3.5 million tons of steel, and is the production base of Bayan Steel. The 120t converter of Bayi Iron and Steel Co., Ltd. is affected by the equipment and equipment, and still uses the method of temperature measurement and sampling to determine the end point of the furnace. Therefore, the furnace lining is eroded quickly at the large surface in front of the furnace and the slag line on both sides, which is the position where the furnace lining is likely to be weak, and it is also the key part of the furnace lining maintenance. Previously, when Bayi Iron and Steel 120t converter maintained the large surface in front of the furnace and the slag lines on both sides, it adopted ...

Claims

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Application Information

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IPC IPC(8): C21C5/44
CPCC21C5/443
Inventor 张浩孙学刚韩东亚刘勇陈刚黄忠民张江勇
Owner XINJIANG BAYI IRON & STEEL
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