钢渣中水化惰性矿物的化学物相分析

Chemical Phase Analysis of Nonhydraulic Minerals in Steel Slag

为评价钢渣胶凝活性和检测钢渣活化加工工艺技术指标,探索了钢渣中金属Fe、Fe_3O_4和RO相3种惰性矿物含量的化学物相分析方法。钢渣中Fe含量测定采用碘乙醇溶液选择性溶解法,在该法中Fe是唯一可溶性矿物成分,由溶解量测定出Fe含量。Fe_3O_4含量测定采用10%HNO3溶液选择性溶解法,不溶性矿物包括Fe_3O_4和耐火材料杂质,磁性不溶物即为Fe_3O_4。钢渣中RO相含量测定采用EDTA-DEA-TEA(乙二胺四乙酸二钠-二乙胺-三乙醇胺)选择性溶解法,不溶性成分包括Fe、Fe_3O_4、RO相和耐火材料杂质,由磁性不溶物量减去Fe、Fe_3O_4含量即为RO相含量。钢渣矿物相粒度小且相互包裹,为确保溶解精度需采用溶解(1.5 h)–湿磨–再溶解(1.5 h)3步工序,中间湿磨后试样为6或8μm以下,溶液温度保持30℃。

The contents of three minerals （i.e., Fe, Fe3O4 and RO phase） were detected by a chemical phase analysis method based on selective dissolution to define the dependence of cementitious activity of steel slag on the mineral contents and to predict the effect of the preliminary processing of the steel slag. For the quantitative determination of Fe, steel slag solids were firstly treated in I2-ethanol solution and then the residual mass of the treated sample was measured, and the content of Fe was calculated based on the unique soluble component of steel slag in the solution. The content of Fe3O4 was determined in a solution of 10% HNO3 based on the unique insoluble magnetic compound in steel slag, and the nonmagnetic refractory impurities existed in the insoluble solids were separated from Fe3O4 by magnetic separation. The content of Fe3O4 was determined via the mass of insoluble magnetic residue. To determine the content of RO phase, the sample was immerged into ethylene diamine tetraacetic acid disodinm salt-diethylamine-triethanolamine （EDTA-DEA-TEA） solution. In the insoluble materials, the nonmagnetic refractory impurities were extracted from Fe, Fe3O4 and RO phase by magnetic separation. The content of RO phase was determined after subtracting the Fe and FeaO4 from the total mass of the magnetic insoluble solids. To fully redissolve the particles of the soluble components, the sample was reground and the fineness of the ground product was 〈 6 or 〈Spin. The controlled temperature of the solutions was 30℃ .