电熔镁锆砂加入量对RH精炼炉用刚玉-尖晶石浇注料性能的影响

摘要

Corundum-spinel castables for RH degassers were prepared using main starting materials of fused dense corundum (5-3 mm),white fused corundum (3-1,≤1,and ≤0.074 mm) and fused aluminarich spinel (1-0.044 mm),binders of pure calcium aluminate cement and active α-Al2O3 micropowder,adding a proper amount of micropowder and high efficient compound water reducing agent.The influences of fused MgO-ZrO2 additions(0,2％,4％,6％,and 8％,in mass) on modulus of rupture,crushing strength,permanent change in dimensions of the corundum-spinel castables fired at 110,1 100 and 1 500 ℃ for RH degassers were researched.Wear resistance of the castables treated at 1 500 ℃ and slag resistance of the castables treated at 1 600 ℃ were researched.The results show:(1)adding 2％ fused MgO-ZrO2 can significantly improve the strength and wear resistance of the castables; (2)as MgO-ZrO2 addition increases,permanent change in dimensions increases obviously; but the castables volume is relatively stable when MgO-ZrO2 addition ranges from 2％ to 4％ ;(3)fused MgO-ZrO2 can significantly improve the slag penetration resistance;the castables gain the best slag penetration resistance with 2％ MgO-ZrO2.%采用粒度为5 ～3 mm的电熔致密刚玉,3～1、≤1、≤0.074 mm的电熔白刚玉,1～0.044 mm的电熔富铝尖晶石等为主要原料,纯铝酸钙水泥、活性α-Al2O3微粉为结合剂,同时添加适量的微粉和高效复合减水剂,研究了电熔镁锆砂加入量(w)分别为0、2％、4％、6％、8％时对RH精炼炉用刚玉-尖晶石浇注料110、1 100和1 500℃处理后的抗折强度、耐压强度、线变化率,以及1 500℃处理后的耐磨性和1 600℃处理后的抗渣性能的影响.结果表明:1)加入2％(w)的电熔镁锆砂能明显提高浇注料的强度和耐磨性；2)随着镁锆砂含量的增加,线膨胀率明显增大,但电熔镁锆砂加入量为2％ ～4％(w)的浇注料体积稳定较好；3)加入电熔镁锆砂可以明显提高浇注料的抗渣渗透性,电熔镁锆砂加入量为2％(w)时,试样的抗渣渗透性最好.