磷酸二氢铵转化法测定重晶石中的硫酸钡含量  

Determination of Barium Sulfate Content by Ammonium Dihydrogen Phosphate Conversion Method

作　　者：赵三慧 何丹 周骏宏[1] 马糯 朱昌鸿 ZHAO Sanhui;HE Dan;ZHOU Junhong;MA Nuo;ZHU Changhong(Key Laboratory of Phosphorus Chemical Engineering of Qiannan Normal College for Nationalities,Duyun,Guizhou 558000,China)

机构地区：[1]黔南民族师范学院磷化工重点实验室,贵州都匀558000

出　　处：《中国无机分析化学》2022年第2期35-39,共5页Chinese Journal of Inorganic Analytical Chemistry

基　　金：贵州省2020大学生创新项目(S202010670019);贵州省科技计划项目(黔科合支撑[2021]一般307);黔南民族师范学院科研项目(QNYSKYPT2018002);黔南州科技计划项目(黔南科合工字[2019]14号)。

摘　　要：针对目前重晶石中硫酸钡含量测定方法研究不多、进展缓慢的问题,提出了一种对重晶石预处理后测定硫酸钡的方法,采用磷酸二氢铵与重晶石在700℃发生复分解反应,将不溶于水且不溶于酸的硫酸钡转化为可溶于酸的磷酸钡盐,最后依据确定的磷钡比关系,根据总磷含量间接得到钡含量。实验结果表明,磷酸二氢铵与硫酸钡的物质的量之比为2.0,并在700℃的条件下高温煅烧,可使硫酸钡全部转化完全,形成偏磷酸钡,再经过氢氧化钠、双氧水处理,转变为正磷酸氢钡并溶于盐酸中,与喹钼柠酮试剂形成磷钼酸喹啉沉淀,根据沉淀质量可准确计算出样品中硫酸钡的含量。测定的结果准确、方法可行。对测定重晶石中硫酸钡的含量提出一种新的思路和解决方案,具有实际意义。Aiming at the problem of limited research and slow progress in the determination of barium sulfate content in barite,a new method for the determination of barium sulfate in barite pretreatment is proposed.It uses ammonium dihydrogen phosphate and barite decomposition reaction occurs at 700℃,then converts water-insoluble and acid-insoluble barium sulfate into acid-soluble barium phosphate salt,and finally obtains the barium content based on the determined phosphorus-to-barium ratio relationship according to the total phosphorus content.The experimental results show that the ratio of the amount of ammonium dihydrogen phosphate to barium sulfate is 2.0 and high-temperature calcination at 700℃can completely transform the barium sulfate into barium metaphosphate,and then undergo sodium hydroxide and hydrogen peroxide treatment.It is converted into barium hydrogen orthophosphate and dissolved in hydrochloric acid to form quinoline phosphomolybdate precipitate with quinmolybdenone reagent.According to the quality of the precipitate,the content of barium sulfate in the sample can be accurately calculated.The method is accurate and feasible.This method provides a new idea for determining the content of barium sulfate in barite,which has practical significance.

关 键 词：重晶石 硫酸钡 磷酸二氢铵 喹钼柠酮 磷钼酸喹啉 重量法 

分 类 号：O655[理学—分析化学]