碱度及冷却方式对钢渣还原尾渣水化活性影响

Effect of Basicity and Cooling Process on Hydration Activity of Steel Slag Reduction Tailings

以石英砂为碱度调节剂、石墨坩埚为反应容器和自牺牲还原剂,采用矿热冶炼炉工艺还原分离钢渣中铁,并利用水淬、风淬对3种碱度熔融钢渣还原尾渣进行预处理,用以制备淬冷渣。结果表明:中、低碱度淬冷渣玻璃体含量可高达99%,风淬更益于高碱度渣玻璃体结构保留;淬冷渣水化活性与其玻璃体含量呈正相关,活性最高可达103%,而碱度和冷却方式均会影响玻璃体含量,且碱度影响更大。淬冷渣的水化放热过程与普通粒化高炉矿渣相似,7d降低胶凝体系的累积水化放热高达63.6J/g。

Using quartz sand as the basicity regulator,graphite crucible as the reaction vessel and self-sacrificing reducing agent,the iron in the slag was separated by reduction in the ore heating furnace process,and pre-treated with water quenching and air quenching for three basicity molten steel slag reduction tailings to prepare quenched cold slag.The results show that:the glassy phases content of medium and low basicity quenched slag can be as high as 99%,and air quenching is more beneficial for maintaining glassy phases of high bacisity slag.Hydration activity of quenched slag is positively correlated with its glassy phases content,and the activity can reach up to 103%.Basicity and cooling method will affect the glassy phases content,while basicity has a greater effect.The exothermic hydration of quenched slag is similar to ordinary granulated blast furnace slag,with a cumulative exothermic heat of hydration of up to 63.6J/g for the 7dreduced cementation system.