Repairing mass and preparation method thereof

Abstract

The invention relates to a repairing mass for repairing in the converter production process of steel making and vanadium extracting of steel enterprises, in particular to a repairing mass used for a converter lining made of magnesia carbon bricks and a preparation method thereof, and provides a repairing mass having the advantages of short sintering time and long service life for meeting the requirement of production. The repairing mass per 100 weight parts comprises the following raw materials in parts by weight: 48-60 parts of fused magnesia, 22-28 parts of magnesite clinker, 10-16 parts ofmodified asphalt, 1-5 parts of metallic aluminum powder, 1-4 parts of ferric oxide powder and 2-10 parts of adhesive. The preparation method of the repairing mass is simple and convenient, i.e. all the raw materials are mixed. In the fettling production process of the vanadium extracting converter, when a local breakage appears on the converter lining, the repairing mass is coated on the part to be repaired; the repairing mass is sintered by utilizing the wall temperature of the converter, and production by blending with iron can be carried out after sintering; and under the conditions of lowsmelting temperature (1,360-1,400 DEG C) of the vanadium extracting converter and shorter smelting period (5-10 minutes), the repairing mass still can be quickly sintered with a working lining to form an organic combination with higher strength so as to prolong the service life of the repairing mass.

Description

technical field [0001] The invention relates to a repair charge used in repairing a vanadium-extracting converter for steelmaking in iron and steel enterprises, in particular to a repair charge used for turning the lining of a vanadium-extracting converter into a magnesia-carbon brick and a preparation method thereof. Background technique [0002] Most of the steelmaking in large iron and steel enterprises is marked by converter steelmaking. Furnace age is one of the important indicators of steelmaking level. Among them, vanadium extraction converter production is a relatively special smelting process. The vanadium slag is extracted through the converter vanadium extraction process to reach efficient use of resources. Due to the particularity of the vanadium extraction process of the converter, the lining material of the converter is not only chemically corroded by high-temperature molten steel and slag during use, but also mechanically scoured by molten iron and scrap steel...

AI Technical Summary

Problems solved by technology

Water-based repairing materials have excellent fluidity and short hardening time, but low high-temperature flexural strength and adhesion strength; non-water-based repairing materials are generally asphalt-bonded, with short sintering time and high high-temperature strength

[0004] The vanadium steelworks where the inventor works, the original vanadium extracting converter repair materials are 75% of mid-grade magnesia, 15% of medium-temperature asphalt, 5% of phenolic resin, 3% of metal aluminum powder, Fe 2 o 3 powder 2%, the sintering time of a single furnace is longer (over 60min), and there are often abnormal damage phenomena such as material collapse, material turning, and rapid erosion, so that the life of a single furnace repair is only about 10 furnaces. Due to the expansion of the production capacity of the vanadium extraction converter, the original repair charge can no longer meet the production needs. Therefore, it is urgent to provide a repair charge with a short sintering time and a long service life to meet the production needs.

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