A kind of diffuse type air permeable brick and its preparation method

Abstract

The present invention relates to a dispersive air brick and a preparation method thereof. According to the technical scheme of the invention, 50 to 80 wt% of plate-shaped corundum is adopted as an aggregate. 12 to 32 wt% of aluminum oxide fine powders, 5 to 10 wt% of alumina micro powders and 3 to 8 wt% of a binding agent are adopted as matrix materials. According to the method, firstly, the matrix materials are uniformly mixed, and then the matrix materials and the aggregate are put into a mixer. 0.1 to 0.3 wt% of a water reducing agent and 4 to 6 wt% of water, counted relative to the sum of the aggregate and the matrix materials, are additionally added. The obtained mixture is stirred for 3 to 5 minutes, and then is cast and molded. After an obtained product is standing at the room temperature for 20 to 30 hours, the obtained product is dried for 22 to 26 hours at the temperature of 90 to 120 DEG C. then the obtained product is thermally insulated for 3 to 6 hours at the temperature of 1450 to 1650 DEG C. In this way, the dispersive air brick can be obtained. The plate-shaped corundum is in the form of equal-diameter particles, and the particle sizes of the equal-diameter particles are 2 to 5 mm. The method has the advantages of simple process, low labor intensity, high production efficiency, no pollution to the environment, and low cost. The prepared dispersive air brick is good in air permeability, strong in impurity-removing capability, excellent in thermal shock stability and good in penetration resistance performance.

Description

technical field [0001] The invention belongs to the technical field of air-permeable bricks, and in particular relates to a diffused air-permeable brick and a preparation method thereof. Background technique [0002] In recent years, the refining technology outside the furnace has become an indispensable and important link in modern steel production, and it has increasingly shown its superiority in increasing the variety of steel and improving the quality of steel. Argon blowing at the bottom of the ladle is the key to the refining process outside the furnace, and the bottom blowing air brick is the most critical functional element of this process. Its performance can ensure the smooth implementation of the argon bottom blowing process and ensure the reliability and safety of the refining process outside the furnace. very important. Blow inert gases such as argon and nitrogen into the molten steel through the breathable brick installed at the bottom of the ladle, fully stir...

AI Technical Summary

Problems solved by technology

"An Al 2 o 3 -SiO 2 Tundish breathable brick and its preparation method" (CN201110231552.X) patented technology, the method uses tabular corundum particles with a particle size of 0.088~3mm, mullite particles with a particle size of 0.088~1mm, white corundum fine powder , ρ-Al 2 o 3 Fine powder and silicon micropowder as raw materials, plus a mixture of sodium hexametaphosphate and sodium tripolyphosphate, yellow dextrin, azodicarbonamide, Al 2 o 3 -SiO 2 Gel powder and aluminum fluoride are used as admixtures, and there are many kinds of raw materials, which reduce production efficiency and increase labor intensity; the patented technology of "An anti-permeation air brick and its manufacturing method" (CN201210247846.6), the method uses Corundum particles with a particle size of 2~4mm, 1~2mm, 0~1mm, corundum fine powder, α-Al 2 o 3 Micropowder, spinel fine powder, hydrated alumina as raw materials, adding organic fibers and micropore forming agents (including starch, aluminum sulfate, aluminum ammonium sulfate, anhydrous magnesium sulfate), formed by decomposition or burning of micropore forming agents A large number of uniformly distributed micropores, because the micropore forming agent will release CO to the external environment during the process of decomposition or burning 2 and NH 3 and other gases, which pollute the environment, and aluminum sulfate has a certain stimulating effect on the eyes and mucous membranes, and has low safety; the patented technology of "a high blowing rate breathable brick and its manufacturing method" (CN201410094948.8), the Methods Using 0.5-1mm coarse corundum particles, 0-0.5mm fine corundum particles, 0.020-0.044mm alumina fine powder, 0-0.020mm alumina micro-powder as raw materials, high blowing rate ventilating materials were prepared by machine pressing. Bricks, forming by machine pressing method requires a large press, and the purchase of equipment is costly and labor-intensive; the patented technology of "a tundish breathable brick and its preparation method" (CN200510018942.3) and "tundish diffused breathable brick The patented technology of "(CN201410050793.8) is to form a tundish dispersed air brick through continuous gradation accumulation. These two patented technologies are formed by continuous gradation accumulation. The large number of raw materials increases labor intensity and production efficiency. Low