Maintenance method of blast furnace liner

Abstract

The invention provides a maintenance method of a blast furnace liner. The method comprises the following steps of: removing a fireproof liner and residential iron which are seriously corroded below a bosh so as to ensure that an area with the width not less than 500mm and an annular segment cross section is formed between a cooling wall of a blast furnace and the residential iron along the diameter direction of the blast furnace after the fireproof liner and the residential iron are removed; clearing floating dross remained due to the removal of the fireproof liner and the residential iron; laying bricks made from a new fireproof material in a horizontal bricking mode; and filling brick gaps among the fireproof bricks with mortar with the mortar plumpness not less than 95 percent to sequentially form a carbon material layer with the thickness from 80mm to 100mm and a fireproof brick layer with the thickness not less than 400mm between the cooling wall of the blast furnace and the residential iron along the diameter direction of the blast furnace so as to form a tightly filled new liner in the area, wherein the carbon material layer and the fireproof brick layer mutually and tightly contact. The method of the invention has the advantages of low maintenance cost and short maintenance project period.

Description

technical field [0001] The present invention relates to the technical field of blast furnace ironmaking, and more specifically, relates to a blast furnace lining maintenance method, which can solve the problem of blast furnace first-generation furnace failure caused by severe corrosion of hearth, furnace bottom or taphole in the later stage of blast furnace production. Overhauled advance issues. Background technique [0002] At present, for many blast furnaces, due to the tight production tasks and other reasons, the maintenance cycle of the blast furnace is prolonged, and the enhanced smelting operations such as oxygen-enriched coal injection lead to intensified erosion of the blast furnace lining. It is often the case that the overhaul of the first generation of the blast furnace is advanced due to severe erosion of the hearth, furnace bottom or taphole. This is very unfavorable to blast furnace production. Taking the blast furnace for smelting vanadium-titanium magnetit...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method to solve the problem of the difference between the new hearth brick and the original vertical brick by removing and replacing the severely eroded refractory lining below the blast furnace bosh and the residual iron formed in the bottom of the furnace. The problem of non-layered furnace bottom bricks and the method of repairing the blast furnace lining in the late stage of the first-generation furnace by using phosphate castables to directly pour the iron gate, etc., this method is low in cost and can quickly and efficiently realize the repair of the blast furnace lining

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