混酸消解法测定浮法玻璃原料COD值  

Mixed-acid Digestion Method for Determination of Chemical Oxygen Demand in Float Glass Raw Materials

作　　者：李豫梅[1] 刘小青[1] 许亚文 张开[1] 谢峻林[1] 

机构地区：[1]武汉理工大学硅酸盐材料教育部重点实验室,武汉市430070

出　　处：《玻璃》2009年第3期10-13,共4页Glass

摘　　要：为提高浮法玻璃原料化学需氧量(COD)的测定效率,研究了混酸消解法测定浮法玻璃原料COD值的影响因素和最佳实验条件。根据原料的物质组成、加工工艺及其在酸性水溶液中溶解能力的不同,浮法玻璃原料可分为易溶的化工原料、难溶的钙质矿物原料和难溶的硅质矿物原料三种类型。利用正交实验研究了不同原料种类、不同的硫酸和磷酸比例及其不同加入顺序、不同混酸消解时间等三种因素对混酸消解法测定COD值实验结果的影响,结合平行实验得到了混酸消解法测定不同类型原料COD值的最佳实验条件。研究结果表明不同种类原料COD值相差较大,硫酸和磷酸的最佳比例为4:1,最佳加入顺序是先磷酸后硫酸,化工原料的最佳消解时间为15min,矿物原料的最佳消解时间为30min。To improve the efficiency of the determination of chemical oxygen demand（COD） in float glass raw materials, the influencing factors and optimal experiment conditions of mixed-acid digestion method were studied. According to their different compositions, processing techniques and solubility in acidic aqueous solutions, glass raw materials were classified into three types as soluble chemical raw materials, indissoluble calcareous and siliceous mineral raw materials. Orthogonal experiments were used to study the influence on COD test result of different raw materials types, different mixed-acid digestion time, different proportion between sulfuric acid and phosphoric acid and their different feeding orders. Replicate experiments were used to select the optimal conditions of the COD experiment for different types of raw materials. The results show that the COD value of different types of glass raw materials differs from each other greatly; the optimal proportion of H2SO4：H3PO4 is 4：1; the optimal acid added order is phosphoric acid first and sulfuric acid the second; the optimal digestion time for chemical raw materials is 15min, and for mineral raw materials is 30min.

关 键 词：玻璃原料 COD值 混酸消解法 

分 类 号：TQ171[化学工程—玻璃工业]