论文部分内容阅读
以四川金河磷矿制得的二水湿法磷酸为对象 ,采用化学沉淀法 ,研究沉淀剂种类、用量 ,加入方式 ,反应温度 ,反应时间 ,液相混合状况以及沉淀剂配制方法对脱除磷酸中氟的影响。将实验数据回归整理得到 :(1)沉淀剂用量与磷酸中剩余氟含量的关系式 ;(2 )磷酸的脱氟温度与磷酸中剩余氟含量的关系式。当磷酸中先加入 Na2 S·9H2 O,后加入 Na2 CO3(分别为脱氟所需理论用量的 10 0 %和 2 0 0 % ) ,在 2 5～ 30℃ ,反应 2 5～ 30 m in,则磷酸中剩余氟、砷和铅等的含量将降至很低
Taking the wet-process wet-process phosphoric acid obtained from Sichuan Jinhe Phosphate Mine as an example, the chemical precipitation method was used to study the effects of precipitant type, dosage, adding method, reaction temperature, reaction time, liquid phase mixing conditions and precipitant preparation method Effect of fluorine in phosphoric acid. The experimental data are regressed to obtain: (1) the amount of precipitating agent and phosphoric acid residual fluorine content; (2) phosphoric acid defluorination temperature and residual phosphoric acid content of the relationship. When Na2S.9H2O is added to the phosphoric acid, Na2CO3 (10% and 200% of the theoretical amount required for defluorination, respectively) is added to the phosphoric acid at 25 to 30C for 25 to 30 minutes, The content of residual fluorine, arsenic and lead in phosphoric acid will be reduced to a very low level