Slag-corrosion-resistant coating for steel ladle carbon-free tank lining and preparation method of slag-corrosion-resistant coating

Abstract

The invention relates to a slag-corrosion-resistant coating for a carbon-free ladle lining of a steel ladle and a preparation method of the slag-corrosion-resistant coating. The slag-corrosion-resistant coating comprises the following raw materials in parts by weight: 50-70 parts of magnesium aluminate spinel; 1-20 parts of zirconium dioxide; 1-5 parts of boride; 10-30 parts of silica sol; 1-10 parts of a micromolecular organic carboxylic acid solution; 0.1-2 parts of an oxysilane coupling agent; 0.1-2 parts of a water reducing agent; the silica sol is acidic silica sol, the pH value is 2-6, and the content of SiO2 in the silica sol is 20-40%. The slag-corrosion-resistant coating has the advantages that the slag-corrosion-resistant coating is suitable for steel ladle carbon-free tank lining bricks, and a coating layer coated with the slag-corrosion-resistant coating is smooth and compact in surface, low in porosity, uniform in quality, stable in performance, good in bonding performance with base bricks at normal temperature and high temperature, good in thermal shock resistance and good in anti-scouring performance, and the slag-corrosion-resistant effect is remarkably improved; the good slag-resistant protection effect can be achieved on the refractory material of the carbon-free tank lining, and the repairing frequency of the carbon-free tank lining is reduced.

Description

technical field [0001] The invention is applied to the coating field of refractory materials, and in particular relates to a slag erosion-resistant coating for ladle carbon-free tank lining and a preparation method thereof. Background technique [0002] At present, with the increasing demand for clean steel in the application market, the performance requirements for steel are constantly improving. Magnesia-carbon bricks (with a carbon content of 10-16%) contain graphite, are not wetted by steel slag and molten iron, and have low apparent porosity, so they have good thermal shock stability and excellent slag resistance, and are widely used in the steel ladle. However, the high carbon content in magnesia carbon bricks leads to high heat loss in the iron and steel smelting process, and at the same time, high carbon content is not good for smelting low carbon steel and ultra-pure steel. The slag line of the ladle is in direct contact with the slag, and is most severely eroded ...

AI Technical Summary

Problems solved by technology

However, the carbon-free tank lining bricks are mainly composed of corundum, magnesia and spinel, which are easy to react with slag, and the brick body has a high apparent porosity, and the slag can easily penetrate into the carbon-free tank lining bricks and cause chemical erosion, resulting in a permeable layer , metamorphic layer, etc., due to the formation and melting of low-melting material and abnormal structural peeling off of the metamorphic layer, the tank lining is eroded and damaged by slag, and with the repeated use of the tank lining, the slag erosion will continue to intensify until the residual thickness of the tank lining cannot reach Offline due to safety use requirements

Therefore, the ordinary carbon-free tank lining without coating has poor anti-slag erosion effect, and is severely damaged by slag erosion during use.

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