海水制盐及综合利用过程铷富集规律研究

Accumulation Law of Rubidium in the Process of Producing Salt and Multipurpose Utilization from Seawater

研究了钠、钾、镁、钙等离子对火焰原子吸收光谱法测定铷的影响,采用标准加入法实现高基质卤水及产品中铷含量的直接测定,加标回收率为95.8%~106.8%。研究阐明了海水制盐及综合利用过程中铷的分布与富集规律,海水制盐生产过程中铷随卤水浓缩而富集,卤水中的铷含量与波美度呈正相关趋势;而制盐母液(苦卤)综合利用过程中,铷会伴随光卤石一起析出,并富集在光卤石和氯化钾产品中,铷含量分别为93.95 mg/kg和88.53 mg/kg,液相中铷含量以析出光卤石前的苦卤最高,可达4.780 mg/L。

The interference of main cation in seawater,including Na~＋,K~＋,Mg^（2＋）and Ca^（2＋） ,on the determination of rubidium by flame atomic absorption spectrometry（ FAAS） was tested. The standard addition method was used to analyze the content of rubidium in brine and product during making salt from seawater successfully and the recovery was 95. 8% ~ 106. 8%. It was found that rubidium had the tendency of positive correlation with the baume degree of brine during the process of making refined salt. However,rubidium would crystallized along with carnallite during the process of bittern multipurpose utilization and was enriched in carnallite and its product potassium chloride. The content of rubidium in carnallite and potassium chloride was 93. 95 mg/kg and88. 53 mg/kg. The bittern before carnallite crystallization had the highest rubidium content4. 780 mg/L among the brine.