Steel ladle bottom castable

Abstract

The invention discloses steel ladle bottom castable. The steel ladle bottom castable comprises 15-25% of precast blocks, 40-50% of black aloxite, 5-10% of fused magnesium aluminate spinel, 5-15% of white corundum, 1-5% of sintered spinel, 0.5-1.5% of fibers, 5-10% of activated aluminium oxide micro-powder, 5-10% of a binder, 0.5-1% of a superplasticizer, 2-5% of silica powder, 0.01-0.05% of citricacid and 0.01-0.05% of metal aluminum powder, wherein the particle size of aggregate of the precast blocks is 8-35 mm, and the particle size of the metal aluminum powder is 60 meshes. According to the steel ladle bottom castable, the main raw material aggregate is the industrial by-product black aloxite, thus slag is reused, waste discharge is reduced, the production cost of the steel ladle bottom castable is reduced, moreover, in the steel ladle bottom castable, the content of the black aloxite is high, a thermal shock effect is good, the service life of a fire-resistant product is prolonged, a heat conductivity coefficient of the black aloxite is small, a heat insulation effect is good, a safety factor of a steel ladle is high, and the scouring resistance of the steel ladle bottom castable is improved, so that better use prospects are brought.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a ladle bottom castable. Background technique [0002] With the development of refining outside the furnace and continuous casting technology and the increase in market demand for cleanliness, the requirements for ladle smelting conditions are getting higher and higher, and the service life of refractory materials for ladles is getting longer and longer. As the temperature of molten steel increases, the residence time of molten steel in the ladle prolongs, so that the refractory lining of the ladle is subjected to greater erosion loss, while the refractory material at the bottom of the ladle is directly subjected to the erosion of the steel flow during the steelmaking process, and the erosion rate of the ladle bottom and the The inconsistency in the erosion rate of the wall refractories leads to a lower service life of the refractory materials at the bottom of the la...

AI Technical Summary

Problems solved by technology

As the temperature of molten steel increases, the residence time of molten steel in the ladle prolongs, so that the refractory lining of the ladle is subjected to greater erosion loss, while the refractory material at the bottom of the ladle is directly subjected to the erosion of the steel flow during the steelmaking process, and the erosion rate of the ladle bottom and the The erosion rate of the wall refractories is inconsistent, resulting in the life of the refractories at the bottom of the ladle being lower than that of the refractories at other parts of the ladle, which directly affects the overall service life of the ladle

At the same time, the mechanical strength of the refractory material at the bottom of the ladle is also an important part of ensuring the safety of the ladle. Effectively improving the castable material for the bottom of the ladle and increasing its service life has become the key to further improving the overall service life of the ladle. At this stage, pouring construction has gradually become the key to ladle construction. The mainstream, but the main crystal phase is the corundum phase castable, the price is high and the service life of the material is short, which does not meet the requirements. Therefore, we propose a ladle bottom castable

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