采用破碎、干燥、粉磨、煅烧和陈化等处理工艺对钛石膏进行物理改性,研究了煅烧温度对钛石膏力学性能的影响,通过掺加硫酸钠、生石灰和硅酸盐水泥等外加剂对钛石膏进行化学改性,确定了外加剂掺加量的最佳配比,并对改性机理进行了探讨.结果表明,钛石膏经180 ℃煅烧3 h,掺加0.5%硫酸钠、3%生石灰和5%硅酸盐水泥,制得的试样力学性能可以达到:2 h抗折强度2.6 MPa、抗压强度3.2 MPa,绝干抗折强度4.58 MPa、抗压强度5.2 MPa.经改性后钛石膏试样的强度指标可以达到建筑石膏国家标准中1.6等级的要求.
Physical modification methods were used by processes, such as breaking, drying, milling, calcining and ageing. The effect of calcining heat on mechanical properties of titanium gypsum was studied. Sodium sulfate, calces and Portland cement were added to titanium gypsum for the chemical modification. The optimum mix of dosage of additives was obtained. The mechanism of the physical modification and chemical modification was discussed. The experiment showed that the mechanical properties of titanium gypsum samples were improved with 0.5% sodium sulfate, 3% calces and 5% Portland cement added after being calcined at 180 ℃ for 3 h. The mechanical properties of titanium gypsum samples: 2 h flexural strength was 2.6 MPa, 2 h compressive strength was 3.2 MPa, absolutely dry flexural strength was 4.58 MPa and absolutely dry compressive strength was 5.2 MPa. After modification, the strength indices of titanium gypsum samples were better than those of 1.6 Level in the national standard calcined gypsum.
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