钡渣作为一种有害的工业废弃物，其资源化利用兼具环境效益与经济效益双重价值。该研究创新性地采用钡渣为添加剂制备了建筑用烧结砖，系统研究了钡渣掺量对烧结砖化学组成、物相组成、微观结构与物理性能的影响，分析了Ba²⁺在制品烧成过程中的迁移转化行为，揭示了Ba²⁺浸出行为的钝化机制。结果表明，当钡渣的掺量为6%（质量分数）、烧结温度为1 250 ℃时，制备出的烧结砖制品具有最佳的综合性能，样品的气孔率为8.36%、吸水率为3.51%、抗压强度为66.17 MPa。浸出实验结果显示，制品的Ba²⁺浸出质量浓度为1.77 mg/L。钡渣中的BaO组分能与Al₂O₃-SiO₂二元系统反应，生成BaO-Al₂O₃-SiO₂液相，该液相具有双重作用：一方面显著降低了样品的气孔率和吸水率，另一方面促进了莫来石晶相的发育生长，这种协同增强效应使制品的抗压强度最高提升了1倍。Ba²⁺浸出行为的钝化机制表现为三重作用：首先，钡渣的引入改善了样品的致密度，有效阻隔了酸液渗透进入样品，从而减少了内部Ba²⁺溶出；其次，含Ba²⁺液相转变成玻璃相，束缚了Ba²⁺的浸出；最后，BaO与莫来石反应生成耐酸腐蚀性优异的钡长石相。

Barium slag，as a hazardous industrial waste，offers dual benefits of environmental and economic value through its resource utilization.The barium slag was innovatively used as an additive to prepare building bricks in this study，the influence of barium slag content on the chemical composition，phase composition，microstructure，and physical properties of the bricks was systematically investigated.The migration and transformation behavior of Ba²⁺ during the sintering process was analyzed and the passivation mechanism of Ba²⁺ leaching was revealed.The results indicated that when the barium slag content was 6% and the sintering temperature was 1 250 ℃，the sintered bricks exhibited optimal comprehensive properties：The sample's porosity was 8.36%，water absorption rate was 3.51%，and compressive strength was 66.17 MPa.The leaching test results showed that the Ba²⁺ leaching concentration of the product was 1.77 mg/L.The BaO component in the barium slag reacted with the Al₂O₃-SiO₂ binary system to form a BaO-Al₂O₃-SiO₂ liquid phase，which had a dual effect.On one hand，it significantly reduced the porosity and water absorption rate of the samples，and on the other hand，it promoted the development and growth of the mullite crystalline phase.This synergistic effect increased the compressive strength of the products by up to 100%.The passivation mechanism of Ba²⁺ leaching behavior manifested as a triple effect.Firstly，the introduction of barium slag improved the density of the sample，effectively blocking acid solution penetration into the sample interior to leach Ba²⁺.Secondly，the Ba²⁺-containing liquid phase transformed into a glass phase，restraining Ba²⁺ leaching.Finally，BaO reacted with mullite to form barium feldspar phase with excellent acid corrosion resistance.