采用X射线衍射、光学显微镜和扫描电镜对莱钢、宝钢、鞍钢和酒钢烧结矿进行了研究，提出了高碱度烧结矿（w(CaO)/w(SiO2)=1.84～2.11）的矿物组成与矿相结构共性特征和差异。研究发现，其矿物组成主要有赤铁矿、磁铁矿、铁酸钙和硅酸钙，其中赤铁矿主要以自形晶和少量的他形晶存在，与铁酸钙之间具有明显的界面，而磁铁矿主要以粒状他形晶存在，与铁酸钙呈熔蚀结构。铁酸钙多以柱状和针状形态存在，中间交织着柱状或粒状的β硅酸二钙。另外，烧结矿粘结液相内适当地增加Al2O3含量，有助于针状铁酸钙生成。
Mineralogical composition and microstructure of high basicity sinters of Laisteel, Baosteel, Ansteel, and Jiusteel were investigated by Xray diffraction, optical microscopy and scanning electron microscopy. It was found that the high basicity sinter with w(CaO)/w(SiO2)=1.84～2.11 is mainly composed of hematite, magnetite, calcium ferrate, and calcium silicate. The hematite are rhombic and of automorphic crystals and small quantity of allotriomorphic crystals interfaced with calcium ferrite obviously. The magnetite is granular and of allotriomorphic crystals, cementing with calcium ferrite to form corrosion structure. Calcium ferrate is mainly of columnar and acicular form. The β calcium silicate are granular or columnar, between which the columnar or acicular calcium ferrites are existed. In addition, the increase of Al2O3 content in the binding liquid phase of high basicity sinters is useful to promote formation of acicular calcium ferrate.
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