高强度速分散硅钙颗粒制备及团聚机理研究

Preparation and agglomeration mechanism of high-strength rapidly dispersed calcium silica particles

以钙硅粉体为原料,添加木质素磺酸钙-壳聚糖有机黏结剂,通过圆盘造粒技术制备硅钙球团颗粒,考察黏结剂、木质素磺酸钙、壳聚糖添加量以及干燥温度等对硅钙球团颗粒抗压性能及速散性的影响,并对造粒工艺条件进行优化;借助于XRF、XRD、FTIR等技术对原料及样品进行表征,探究硅钙粉体团聚成粒的机理。结果表明,最佳成型造粒条件为:木质素磺酸钙添加量3.75%,壳聚糖1.25%,干燥温度115℃,颗粒团聚紧密,平均抗压强度为34.4 N,亲水基团加速了水分子向颗粒内部渗透,静水实验结果显示,51 s内样品可完全崩解。

Calcium-silicon powder was used as raw material,calcium lignosulfonate-chitosan was added as organic binders,and silicon-calcium pellets were prepared by disc granulation technology.Different binders,calcium lignosulfonate,the effect of factors such as chitosan addition amount and drying temperature on the compressive properties and quick-dispersion properties of calcium silicate pellets were investigated,and the granulation process conditions were optimized.With the help of XRF,XRD,FTIR and other technologies,the raw materials and samples structure and properties were analyzed to explore the mechanism of agglomeration and granulation of silicon-calcium powder.The results show that the best molding and granulation conditions are 3.75%calcium lignosulfonate,1.25%chitosan,and a drying temperature of 115℃,the particles are closely agglomerated,and the average compressive strength is 34.4 N.The penetration of water molecules into the particles is accelerated,and the hydrostatic test results show that the samples could be completely disintegrated within 51 s.