颗粒膨润土的制备技术及对染料脱色性能的研究

以淀粉为胶粘剂、煤粉为致孔剂，对粉末状膨润土进行颗粒化研究.实验中考察了温度、时间、胶粘剂和致孔剂的用量等影响因素，利用正交实验确定了多孔膨润土颗粒的最佳制备条件.然后用阳离子聚合物EPI-DMA对其进行孔隙内的有机负载，从而得到阳离子聚合物/膨润土颗粒.实验结果表明，颗粒化的最佳条件为：质量比为40∶10∶1的膨润土粉末、煤粉和淀粉制备的颗粒于600℃下煅烧6h.在此基础上研究了阳离子聚合物EPI-DMA对多孔膨润土颗粒进行有机负载的优化条件为：改性剂浓度50g·L^-1，水浴40℃条件下反应4h.在此条件下制得的阳离子聚合物/膨润土颗粒对活性翠蓝K-GL的脱色效果可达96.78%.

Preparation of granulating modified-bentonites and its decoloration performances to dyes

By using coal as the pore causing agent and amylum as the crossing linking agent, a series of bentonite granules were prepared. Then, the raw bentonite granules were modified by EPI-DMA to obtain optimum properties of adsorption. The orthogonal test optimization method qualified the feasible molding condition, of which the quality ratio was 40∶10∶1 and was calcined at 600℃ for 6 hours. The concentration of EPI-DMA, reaction time, temperature and pH value were considered for bentonite granule modification. The results showed that modified bentonite granules with better adsorption ability were manufactured by reacting at 40℃ for 4 hours with the EPI-DMA concentration of 50g·L^-1. The BET surface area analysis technique was used to qualify the properties of the bentonite granule samples.