本研究针对大型铸钢件生产用铬铁矿砂存在的资源少、价格高、铬污染等问题，利用资源丰富的镁砂及高铝质材料，用人工制球及高温烧结工艺制作出一种新型铸造特种砂———镁铝质球形砂。该砂具有很高的耐火度和优异的抗金属渗透及粘砂的能力，粒形圆整，流动性及透气性好，无污染，在大型铸钢件上获得了良好的应用效果。 In this paper, aiming at the problems of less resource, high price and chromium pollution in the chromite ore used for the production of large-scale steel castings, a new type of chromite ore is manufactured by using artificial ball and high-temperature sintering process with rich magnesia and high aluminum materials Cast special sand --- magnesium aluminum spherical sand. The sand has a high degree of refractoriness and excellent resistance to metal infiltration and sticking sand, granular shape, good fluidity and air permeability, pollution-free, obtained good results on large-scale steel castings.