磷酸铁废渣的提纯试验研究

Experimental Study on Purification of Iron Phosphate Waste Residue

摘要: 研究了反应温度、硝酸浓度、时间对磷酸铁废渣溶解率的影响，以及铁磷比、温度、反应体系pH对磷酸铁性能的影响。利用TG-DSC等分析手段，对磷酸铁样品的化学成分、形貌特征、晶体结构等进行表征分析。结果表明，废渣溶解阶段：当反应温度为95℃、硝酸浓度为1.5 mol/L、反应时间为4 h时，溶解效果最好；磷酸铁制备阶段：当铁磷比为1:2，反应温度为70℃、pH为1.0时，磷酸铁产率最佳。纯度较高的条件：铁磷比为1:1，温度为60℃，pH为1.5，磷酸铁含量为80.05%。

Abstract: The effects of reaction temperature, nitric acid concentration and reaction time on the dissolution rate of iron phosphate waste residues, as well as the effects of iron-to-phosphorus ratio, reaction temperature and pH of reaction system on the properties of iron phosphate were studied. The chemical composition, morphology and crystal structure of the iron phosphate samples were characterized and analyzed by TG-DSC and other analytical methods. The experimental results show that in the dissolving stage of waste residue: when the reaction temperature is 95˚C, the concentration of nitric acid is 1.5 mol/L, and the reaction time is 4 h, the dissolution effect is the best; in the preparation stage of iron phosphate: when the ratio of iron to phosphorus is 1:2, reac-tion temperature is 70˚C and the pH of the reaction system is 1.0, the yield of iron phosphate is the highest. The level conditions of higher purity: the ratio of iron to phosphorus is 1:1, the reaction temperature is 60˚C, the pH is 1.5, and the iron phosphate content is 80.05% at this time.