The world's steel production has been closer to two billion tons per year and the blast furnace slag (BFS) is the maximum solid waste during the iron-smelting and steel-making process. To conserve energy and reduce emissions, on-site treatment of BFS to produce high value-added products has become a trend. In this study, the foamed glass-ceramic (FGC) is prepared by using BFS and waste glass as the base materials and the residual heat of pre-heated furnace as the heat source to simulate the high temperature industrial waste heat. The optimal FGC shows a low apparent density of 0.67 ± 0.052 g cm⁻³, a high porosity of 61.49 ± 1.90%, a good compressive strength of 3.18 ± 0.11 MPa, an excellent strength-to-density ratio of 4.75 MPa cm³ g⁻¹ and a relatively small water absorption ratio of 7.05 ± 0.95%, which could completely satisfy the application requirements in the field of building construction. Combined with the SEM, XRD and TEM results, it can be found that the new formed CaSiO₃ crystals plays a bridging role between the glass phase and the ceramic phase pre-existed in the BFS, which could effectively reinforce the compressive strength. This study provides a simple and feasible route to treat solid waste by using industrial waste heat and offers a new idea to solve the similar resources, energy and environmental issues.

世界钢铁产量已接近每年20亿吨，高炉渣（BFS）是炼铁和炼钢过程中最大的固体废物。为节能减排，现场处理BFS生产高附加值产品已成为趋势。本研究以BFS和废玻璃为基材，以预热炉余热为热源模拟高温工业余热制备泡沫微晶玻璃(FGC)。最佳 FGC 表现出 0.67 ± 0.052 g cm ^-3的低表观密度，61.49 ± 1.90% 的高孔隙率，3.18 ± 0.11 MPa 的良好抗压强度，4.75 MPa cm ³ g的优异强度密度比⁻¹7.05±0.95%的较小吸水率，完全可以满足建筑施工领域的应用要求。结合SEM、XRD和TEM结果可以发现，新形成的CaSiO ₃晶体在BFS中预先存在的玻璃相和陶瓷相之间起架桥作用，可以有效地增强抗压强度。该研究为利用工业余热处理固体废物提供了一条简单可行的途径，为解决类似的资源、能源和环境问题提供了新思路。