铝酸钙系冶金熔剂和CaF2对镁碳砖的侵蚀比较

摘要

为了降低精炼渣对钢包渣线镁碳砖的侵蚀,分别以20％(w)的冶金熔剂铝酸钙、铝镁酸钙和CaF2与80％(w)的初始钢渣配制成三种精炼渣,以镁碳砖为感应炉的坩埚,在坩埚内放入钢样,待钢样熔化并升温到1 600℃时,加精炼渣持续冶炼5h(期间共更换渣8次),冷却后测镁碳砖渣线部位的侵蚀(渗透)深度并进行SEM分析.结果表明:以铝酸钙和铝镁酸钙为熔剂的精炼渣都比以CaF2为熔剂的精炼渣对镁碳砖的渗透浅、侵蚀小,而以铝镁酸钙冶金熔剂为精炼渣比以铝酸钙冶金熔剂为精炼渣对镁碳砖的渗透和侵蚀性都大大降低.这是由于铝镁酸钙中含有饱和的MgO,减缓了镁碳砖中MgO向CMA渣中的溶解,从而降低了渣对镁碳砖的侵蚀.%In order to reduce the corrosion of refining slag to ladle slag line MgO-C brick,three kinds of refining slags were prepared with 20 mass% metallurgy fluxes of calcium aluminate (CA) and calcium magnesia aluminate (CMA) and CaF2 and 80 mass% original steel slag,and MgO-C bricks were made into crucibles of electric induction furnace. Add steel sample into the crucible,heat up to 1 600 ℃after the steel sample melts,then add refining slag,and hold for 5 h. In the meantime,the refining slags were replaced for 8 times. The corrosion (penetration) depth of the MgO-C brick in slag line was determined and the corroded brick was observed by SEM. The research shows that the MgO-C brick can better resist the penetration and corrosion of refining slags containing CA flux and CMA flux than those of refining slag containing CaF2; refining slag containing CMA flux penetrates and corrodes MgO-C brick obviously slightly than refining slag containing CA flux. CMA flux contains the saturated MgO which reduces the dissolving speed of MgO from MgO-C brick to refining slag containing CMA flux,corresponding decreases the corrosion of the slag.