Waste foundry sand (WFS) accounts for the largest percentage of environmental wastes in the foundry industry and shows an alarming and continuous increase. The treatment of WFS has been investigated previously and mainly as building materials. In this work, the applicability of leaching hazardous WFS in the manufacture of porous thermal insulation material is investigated. Thermodynamic calculation and experimental investigation are performed to evaluate the crystalline composition, microstructure characteristic, strength, and heat-insulating performance, and leaching behavior. In addition to WFS, raw materials include plastic clay, kyanite, and sawdust. High addition of WFS promotes the densification and leads to the remarkable increase in compressive strength. Samples compose of 75 wt% WFS, 15 wt% plastic clay, 10 wt% kyanite, and extra 20 wt% sawdust have a maximum strength of 0.92 MPa and thermal conductivity of 0.11 W (m K)⁻¹ at 200 °C. According to toxicity characteristic leaching procedure analysis, the target metal concentrations in porous material based on WFS are within the US EPA limits, which proves the environmentally friendly application.

铸造废砂（WFS）在铸造行业中占环境废物的比例最大，并且显示出惊人的持续增长。先前已经对WFS的处理进行了研究，并且主要将其作为建筑材料。在这项工作中，研究了浸提有害WFS在多孔绝热材料制造中的适用性。进行热力学计算和实验研究，以评估晶体组成，微观结构特征，强度和隔热性能以及浸出行为。除WFS外，原材料还包括塑料粘土，蓝晶石和锯末。高添加的WFS促进了致密化，并导致抗压强度显着提高。样品由75 wt％的WFS，15 wt％的塑料粘土，10 wt％的蓝晶石组成，^-1在200°C下。根据毒性特征浸出程序分析，基于WFS的多孔材料中的目标金属浓度在US EPA限制之内，证明了其对环境的友好应用。