【摘要】 研究了一条湿法磷酸循环萃取无脱氟工艺路线,不添加除氟剂,仅通过控制盐酸量即可得到氟质量分数较低的磷酸。实验结果表明:20 g磷矿粉中添加盐酸46 m L时实验结果最理想,此时循环过程中萃取液的磷氟比保持在230~300,且萃取率最高可达95%;为使实验过程简便可控,探讨了工艺路线的中控条件,结果表明控制每一步萃取液的p H为0.3~0.5即可得到较好的实验结果。更多还原

【Abstract】 The purification of wet-process phosphoric acid is performed by cycle extraction method without addition of fluorine-removal agent. The phosphoric acid with low concentration of fluorine can be achieved only by controlling the concentration of hydrochloric acid. The results show that m( P2O5) /m( F) in solution keeps around 230- 300 and the extraction rate is up to 95% under the following conditions: 20 g of phosphate rock powder and 46 m L of hydrochloric acid. In order to make the experiment process simple and controllable,the optimization of process is explored. The result shows that controlling the p H around 0. 3- 0. 5 in each step can lead to the good experimental results.更多还原