高钾铝硅酸盐物料中K_2O含量的测定  

Determination of K_2O in High Potassium Aluminosilicate by Tetraphenylborate Gravimetry

作　　者：苗世顶[1] 王英滨[1] 马鸿文[1] 

机构地区：[1]中国地质大学材料科学与工程学院

出　　处：《地球科学（中国地质大学学报）》2005年第3期343-346,共4页Earth Science-Journal of China University of Geosciences

基　　金：教育部博士学科基金项目(No.1999049114);内蒙古自治区科技攻关资助项目(No.20020307).

摘　　要：为了精确测定分解反应过程中钾的挥发量,结合GB85742002,在样品高钾铝硅酸盐物料(钾长石、碳酸钾焙烧熟料,K2O含量大于15%)处理中采用聚环氧乙烷絮凝沉淀Si,新制Ca(OH)2溶液除去Mg2+、Fe2+、Fe3+、Mn2+等其他阳离子,加入碳酸铵稳定溶液pH值以除去Ca2+和Al3+.采用四苯硼钾重量法测定钾含量,测定结果与表样对照,相对误差在0.5%以内.实验表明:利用Ca(OH)2除杂,溶液pH值须控制在10～12;碳酸铵双水解反应后,溶液pH值须控制在7.35左右以除尽Ca2+和Al3+;低温(T<473K)蒸发溶液除去NH4+,消除了因生成四苯硼铵沉淀而带来的分析误差.结果表明该方法可以精确测定高钾铝硅酸盐物料的K2O含量,具有成本低、方便快捷、无需大型仪器之优点.A convenient and rapid method was established to determine K2O content in high potassium aluminosilicate (K2O content > 15%), which was obtained by calcining K-feldspar and K2CO3. Combined with the GB8574-2002 potassium tetraphenylborate gravimetry method, silicon was deposited by polyethylene oxide in an acid environment. Other cations such as Mg2+, Fe3+, Fe2+, Mn2+ were removed by the intrusion of newly formed calcium hydroxide solution by controlling pH at 10-12. The remaining Al3+ and Ca2+ were eliminated by salvolatile hydrolyzation which stabilized the solution at about pH=7.35. Before the potassium tetraphenylborate gravimetry method, the introduced ammonia was removed by low temperature (T<473 K) calcining to avert ammonium tetraphenylborate precipitation. The relative error in this experiment was less than 0.5% by comparison with standard specimen.

关 键 词：高钾铝硅酸盐 四苯硼钾重量法 聚环氧乙烷 碳酸铵 

分 类 号：O652.61[理学—分析化学] O614.113[理学—化学]