Painting and repairing material in use for wall of casting ladle

Abstract

A coating material for repairing the wall of pouring ladle is composed of high-Al particles, fine corundum powder, fine powder of magnesium oxide, micro powder of magnesium oxide, micro Si powder, organic fibers and water-reducing agent (sodium or calcium lignosulfonate or carboxymethyl cellulose) proportionally.

Description

technical field [0001] The invention relates to a smear repair material for pouring ladle walls. Background technique [0002] Improving the service life of ladles is conducive to improving the production efficiency of steel mills, and at the same time saving energy, saving resources, and reducing environmental pollution. Therefore, ladle refractory materials are increasingly developing in the direction of longevity. In the long service life of ladle refractory materials, it is inevitable that there will be parts with local melting loss or severe spalling. These parts with severe local damage must be repaired before the ladle can continue to be used. [0003] At present, there are three main repair methods for the integral ladle wall: [0004] 1. Semi-dry gunning, also known as dry gunning, is currently the most commonly used ladle residual lining repair method. The literature "Research on Dry Gunning Method of Ladle" published in "Journal of East China Institute of Metall...

AI Technical Summary

Problems solved by technology

[0005] The semi-dry gunning method has the following disadvantages: A, the material will rebound during gunning, the amount of dust is large, and the operating environment is harsh; B, the adhesion rate of the gunning material is generally lower than 90%, forming a waste of the gunning material; C, The amount of water added to the gunning material is generally above 15%, which makes the structure of the gunning material loose and low in strength after high temperature treatment; D. The gunning material uses cement or silicate or phosphate as a binder, and clay as a plasticizer , so that more impurities are introduced into the material, which seriously reduces the high-temperature thermal performance of the gunning material, and is easily washed away by molten steel; E. It is necessary to use large and complex equipment to repair the ladle wall, which is inconvenient for construction and cleaning

[0007] The wet gunning method has the following disadvantages: because the pipeline transports the well-mixed slurry, there will be residual slurry adhered to the place where the slurry passes after each spraying, and a large amount of water must be used in time clean up

[0009] The overall casting method has the following disadvantages: it is only suitable for repairing the steel ladle with relatively uniform melting loss of the working lining of the entire cladding wall, and is not suitable for repairing small parts with severe local melting loss, and when repairing the cladding wall, the bottom of the ladle should be cleaned , so that the tire mold can be placed in the center, which increases the difficulty of casting repair, and requires the use of large and complex equipment to repair the ladle wall, so this method is rarely used in actual ladle repair operations

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