刚玉质弥散透气砖的性能与应用

Performance and application of corundum based dispersive purging plug

以刚玉、尖晶石为主要原料,添加Al_2O_3、SiO_2微粉,按一定颗粒级配通过浇注的方式制备出一种免烧氧弥散透气砖,对其体积密度、抗压强度等理化性能进行检测,并在180t钢包上进行使用效果的测试。结果表明:刚玉质弥散砖体积密度≥2.8g·cm^(-3),耐压强度≥65MPa,显气孔率≤26%;与狭缝透气砖相比,吹通率高,使用寿命可提高30%以上;烧氧管、氧气、氮气消耗降低90%;残砖较长;使用安全,经济效益好。

Dispersive purging plugs without purging by oxygen were prepared with corundum and spinel as the main raw materials,alumina and silica fume as additives,adopting a certain particle size distribution and moulding by casting. Physical properties such as bulk density and compressive strength were determined,and the using effects were tested on a ladle of 180 tons. The results show that the bulk density is greater than or equal to 2. 8g·cm-3,the compressive strength is greater than or equal to 65 MPa and the apparent porosity is less than or equal to 26%; the blowing-though rate is higher than slit purging plugs,and the service life increases by 30% or higher; the consumptions of oxygen blowpipe and oxygen as well as nitrogen are reduced by 90%; the residual plugs are longer;the operation is safe and the economic benefit is remarkable.