利用显热对熔渣进行直接改质的热平衡分析及试验验证

Thermal equilibrium analysis and experiment of molten slag modification by use of its sensible heat

采用热态改质方法可直接将冶金熔渣制备成高附加值材料,从而实现熔渣的＂热＂＂渣＂双利用,因此这一方法在熔渣资源化利用领域中已成为研究热点.本文选取熔融钢渣和河沙分别为典型熔渣和改质剂,模拟计算分析在1600℃熔渣内掺入改质剂的过程中改质剂掺量对改质熔渣显热的影响,并对研究结果进行工业试验验证.研究表明：随着改质剂掺入,改质熔渣显热呈现先增加后减小的趋势;随改质剂掺量由5%增加到11%时改质熔渣显热反而增加,当改质剂掺量为11%时改质熔渣显热达到最大.从熔渣显热利用和改质效果综合考虑,改质剂掺量的理论最佳区间为11%~19%.现场试验表明,掺入12%左右的河沙后,改质熔渣流动性好,冷却渣安定性等性能改善显著.

Preparing high added-value materials from molten slag directly by modifying molten slag has drawn a great interest in the utilization of molten slag because of its high efficiency during the integrated utilization of the heat and slag. In this paper,molten steel slag and sands were selected as typical molten slag and modifiers,respectively. The effects of the amount of added modifiers on the waste liquid sensible heat of modified molten slag were studied during the modification process,which was subsequently confirmed by industrial test. It is indicated that the sensible heat of modified molten slag increases at first and then decreases with the addition of modifiers. The sensible heat improves with the increase in mass fraction of modifiers from 5% to 11% and reaches the maximum at the mass fraction of 11%. The optimal amount of modifiers ranges from 11% to 19% in consideration of both the utilization of sensible heat and the performance of modified molten slag. Furthermore,the industrial test verifies that both the fluidity of modified molten slag and the stability of cooled modified slag are significantly improved at the addition of about 12% modifiers.