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Synthesis of battery-grade iron phosphate by microwave method

The battery-grade iron phosphate is synthesized in gas-liquid mixed phase by microwave irritation. The products are characterized by FT-IR,XRD,SEM and TG-DSC techniques. The influences of temperatures and acidity on the properties of iron phosphate products are studied. The effect of HNO3 on crystallization is systematically investigated under very low p H from 0. 1 to 0. 3. The results show that HNO3 vaporizes and decomposes into a large number of gas phase,which strengthens and improves crystallization. Besides these,it also shortens the crystallization time and makes the appearance of crystalline grain become more regular,turning them into diamond structures. The purity of orthophosphate iron is improved in low acidity which avoids the hydrolysis of Fe( Ⅲ).