本文研究了利用钛石膏炒制改性石膏,生产轻质墙体材料的工艺.采用化学分析、差示扫描量热分析(DSC)、X射线光谱(XRD)、扫描电镜(SEM)等微观测试方法,并结合常规的物理化学分析方法,依据我国建筑石膏标准,对炒制改性后钛石膏的物理性能进行测试.研究了不同温度、不同外加剂掺量下对改性石膏物理性能的影响.分析确定了钛石膏炒制改性建筑石膏的温度、外加剂(水泥、石灰、缓凝剂、减水剂)对改性石膏强度、凝结时间的影响.实验结果表明,钛石膏的强度随炒制温度的升高而增大,钛石膏炒制的最佳温度为170 ℃;随缓凝剂掺入量的增多使钛石膏的强度降低,最佳加入量为水泥8%～12%、石灰1%、木质素磺酸钙0.4%～0.5%;同时,170 ℃炒制后钛石膏的微观结构也由长柱状、板状转化为絮状,基体得到粗化,组织结构发生改变.
The article discusses the technique of using titanium gypsum frying to alter the nature of gypsum and produce light-quality wall material. DSC,XRD and SEM, together with other ordinary chemical and physical methods, are applied to test the physical properties of titanium gypsum after frying,according to the gypsum standard of P.R.C. With different temperatures and admixtures, the physical properties of the titanium gypsum are influenced. The results show that the strength of the titanium gypsum changed with the rise of the frying temperature and the best temperature is 170 ℃。Admixture-adding made a change in strength of the titanium gypsum. The best added amount is as follows: concrete 8%-12%, lime 1%, calcium lignosulfonate 0.4%-0.5%. Meanwhile the micro-structure of the titanium gypsum changed from being elongated and tabular to flocculated. Body of the titanium gypsum was fattened and the tissue also changed greatly.
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