磷酸分解磷矿的工艺条件研究

The Process Condition Research of Decomposing Phosphate Rock with Phosphoric Acid

针对双槽工艺二水物湿法磷酸生产中出现的问题 ,在磷酸分解磷矿化学反应过程研究取得成果的基础上 ,研究了两步法中反应时间、反应温度、硫酸加入时段和方式及搅拌强度等 ,对磷矿分解率和所得湿法磷酸浓度的影响。用金河磷矿实验得出的原则工艺条件是 ,反应温度 80℃左右 ,磷酸分解磷矿时间 2h、总反应时间 5h ,液固比 4∶1(质量计 ) ,液相SO3浓度 3 5mg/mL ,搅拌强度随反应时间递降 ,可制得ω(P2 O5)为 2 8%的磷酸 ,磷矿分解率达 98%。

In view of the problems occurred in wet dihydrate process with two compartment reactor for the phosphoric acid production,it studies the reaction time,reaction temperature,timing and method of adding sulfuric acid,agitation intensity in the two step approach,and the influence on the phosphate decomposition rate and the phosphoric acid concentration produced from the wet process on the basis of experiment results from the chemical reaction of decomposing phosphate rock with phosphoric acid.After the experiment with Jinhe phosphate rock,the obtained process conditions are:reaction temperature is about 80 ℃,the period of phosphate rock decomposed with phosphoric acid is 2 hours,the total reaction time is 5 hours,ratio of liquid phase to solid phase is 4∶1,liquid SO 3 concentration is 35 mg/mL,agitation intensity is reduced with the time,and then phosphoric acid [ω(P 2O 5)=28%] can be obtained and the phosphate rock decomposition rate is 98%.