以包钢高炉渣为主要原料，配加少量铬铁矿，在高温渣液降温过程中采用一步保温热处理方法制备微晶铸石，通过熔点测定、差热分析、X射线衍射，扫描电子显微镜观察并结合理化性能测试，研究了铬铁矿加入量对微晶铸石晶化行为和理化性能的影响规律，为包钢高炉渣的低成本高值化利用开辟了新途径。结果表明：在原料配比为高炉渣95%、铬铁矿5%(质量分数)时，微晶铸石整体析晶，主晶相为镁黄长石和铝黄长石，抗折强度为31.88 MPa，密度为3.439 g·cm-3，吸水率为0.036%，耐酸性为0.145%，耐碱性为0.033%，符合国家建筑材料标准，完全可以替代天然大理石和花岗岩用作建筑装饰材料。

Using Baotou steel blast furnace slag as the main raw material and a small amount of chromite, microcrystalline cast stone was prepared by one-step heat treatment method in the cooling process of high temperature slag liquid. Through melting point measurement, differential thermal analysis, X-ray diffraction, scanning electron microscope observation and physicochemical properties test, the influence law of chromite addition amount on crystallization behavior and physicochemical properties of microcrystalline cast stone ware studied. It opens up a new way for low cost and high value utilization of Baotou steel blast furnace slag. The results show that: when the raw material ratio is 95% of blast furnace slag and 5% (mass fraction) of chromite, the overall crystallization of microcrystalline cast stone, the main crystalline phase is magnesium and aluminum feldspar, the bending strength is 31.88 MPa, the density is 3.439 g·cm-3, the water absorption rate is 0.036%, the acid resistance is 0.145%, the alkali resistance is 0.033%, in line with the national standards for building materials. It can completely replace natural marble and granite as architectural decoration materials.