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湿法磷酸生产中急需一种快速、准确的三氧化硫含量在线分析方法。采用流动注射将磷酸溶液连续注样,间断注入沉淀剂和EDTA清洗剂,分光光度法检测湿法磷酸中三氧化硫含量。结果表明:三氧化硫质量浓度测定的线性范围为40~160 mg/L,测定频率为27次/h,RSD<1.0%。本方法能够快速、准确地测定磷酸中三氧化硫含量,同时实现湿法磷酸生产或净化过程中三氧化硫浓度的在线监测。
Wet-process phosphoric acid production is in urgent need of a fast and accurate method for on-line analysis of sulfur trioxide content. Continuous injection of phosphoric acid solution by flow injection, intermittent injection of precipitant and EDTA detergent, and spectrophotometric determination of sulfur trioxide in WPA were carried out. The results showed that the linear range of sulfur trioxide concentration was 40 ~ 160 mg / L, the detection frequency was 27 times / h, RSD <1.0%. The method can quickly and accurately determine the content of sulfur trioxide in phosphoric acid and simultaneously realize the on-line monitoring of the concentration of sulfur trioxide in the production or purification of the phosphoric acid.