Dispersion material for bottom blowing composite air brick of steel ladle and preparation method of dispersion material

Abstract

The invention discloses a dispersion material for a bottom blowing composite air brick of a steel ladle and a preparation method of the dispersion material. The dispersion material is mainly prepared from the following raw materials in percentage by weight: 80 to 85 percent of corundum spheres, 5 to 10 percent of alumina micro powder, 1 to 5 percent of chromium oxide green powder, 1 to 5 percent of magnesia-alumina spinel with 200 meshes, and a binding agent accounting for 2.5 to 3.5 percent of total weight of the raw materials. The preparation method comprises the following steps: firstly, adding the weighed raw materials into a forced sand mixer for premixing to obtain a mixed material; secondly, putting the mixed material into an assembled mold and then carrying out compression moulding to obtain a green brick; thirdly, putting the green brick into a dryer for drying, and putting the dried product into a high-temperature kiln for firing; after the firing is ended, carrying out natural cooling to obtain a product, namely the dispersion material. The dispersion material prepared by the technical scheme adopted by the invention has the characteristics endowed by a traditional dispersion breathable material, as well as the characteristics of relatively-high strength, erosion resistance, permeation resistance, high thermal shock property and the like.

Description

technical field [0001] The invention relates to a refractory material for a ladle bottom-blown composite ventilating brick, in particular to a dispersion material for a ladle bottom-blown composite ventilating brick and a preparation method thereof. Background technique [0002] Ladle bottom blowing air brick is one of the most critical functional components in ladle refining. In modern metallurgical technology, it is a necessary process to purify molten steel and other molten metals by blowing inert gas. The gas (argon) is blown into the ladle mainly through breathable bricks, and generally the breathable bricks are installed at the bottom of the refractory lining of the ladle. Its functions can be summarized as follows: (1) adjust the ladle temperature and uniform composition to achieve the best pouring temperature for the existing process; (2) make the alloy and deoxidizer in the ladle evenly distributed by stirring; (3) mix non-metallic The inclusions are brought into t...

AI Technical Summary

Problems solved by technology

Due to the high porosity of the material itself, these through pores provide a channel for the gas, but the breathable brick of this structure has low strength, poor erosion resistance, and is easy to be peeled off by molten steel and slag penetration; while the diffuse breathable brick It has the characteristics of many and small bubbles blown out