A construction method of integral pouring of blast furnace lining instead of spray paint and refractory bricks

Abstract

The invention discloses a blast furnace liner overall pouring construction method for replacing spraying materials and refractory bricks, and relates to the field of blast furnace repair and new construction. The method comprises the following steps: damaged parts of a furnace hearth and a furnace body of a blast furnace are determined; the furnace hearth and the furnace body are cleaned; a pouring material is prepared; the furnace hearth, a furnace bosh, a furnace waist, the lower part of the furnace body and the upper part of the furnace body respectively adopt a high-strength ultrafine powder combined corundum-SiC pouring material, the high-strength ultrafine powder combined corundum-SiC pouring material, a high-strength ultrafine powder combined high-aluminum-SiC pouring material and a high-strength ultrafine powder combined high-aluminum-mullite pouring material; templates / molds are mounted in the blast furnace from bottom to top; the pouring materials are poured from bottom to top by a vibration or self-flowing pouring forming method to form a pouring liner body; the poured templates / molds are dismounted from top to bottom; after the hardness of the pouring liner body reaches the requirements, the templates / molds are dismounted; and the natural drying and the baking are performed. The method can obtain the blast furnace liner body with more compact structure, higher fire resistance and longer service life.

Description

technical field [0001] The invention relates to the field of blast furnace repair and new construction, in particular to a blast furnace lining integral pouring construction method that replaces spray paint and refractory bricks. Background technique [0002] After a period of production in blast furnace hearths (including tapholes, tuyere belts), furnace shafts (including bosh, furnace waist) and other parts in ironworks, due to construction quality, production operations, material quality, especially intensified smelting, etc. Due to the influence of various factors, the relevant parts of the blast furnace are damaged to varying degrees: a. Under the influence of high temperature corrosion and material erosion, the ceramic cup of the blast furnace hearth causes peeling, resulting in the loss of basic functions; b. The hearth part is damaged by the carbon brick lining. Corrosion, peeling, and thinning lead to an increase in the heat flow intensity of the bottom of the furna...

AI Technical Summary

Problems solved by technology

[0005] When spraying paint (or spraying material) is used to repair the blast furnace lining, due to the spray paint drying and firing, the structure has low density, low fire resistance, and poor combination with the original blast furnace lining structure. When used after the repair is completed, the fire resistance is low, it is easy to fall off, and the service life is short

[0006] Although the technical indicators of the currently disclosed spray coatings are relatively high, in actual testing, the pouring molding method is basically used for testing, and the spray coatings (including wet injection materials) are sprayed, and the actual indicators are compared with the theoretical ones. indicators are much lower

[0007] Furthermore, when repairing the lining of the blast furnace by laying refractory bricks, the refractory mud of the corresponding grade is used for masonry. Features, after a period of use, it is easy to form voids, resulting in loose refractory brick lining, easy to wear, fall off, or even partially collapse, and the service life is short

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