Agglomeration of FePO4 Prepared by Continuous Reaction Precipitation
In order to control the FePO4 particles size, the reaction precipitation between Fe (NO3)3 and H3PO4 was performed by the controlled crystallization technique. The influences of the feed concentration, stirring speed and reaction temperature on the agglomeration size of FePO4 were investigated. The particles produced were amorphous and can be crystallied to pure phase FePO4 after calcining at 550 °C for 5 hours. The agglomerates size and morphology were characterized by the laser granulometer and scanning electron microscope, respectively. The results showed that the products were spherical and the agglomerate size was in the range of 2~9 μm at the solution PH 2.30 and the other experiment conditions were as follows, the reactant concentration was ranged from 0.5 to 1.0mol/L, stirring speed from 500 to 3000 rpm and reaction temperature from 15 to 80°C. It was found that the agglomerates size increased with the increase of the reaction temperature, decreased with the increase of the feed concentration and stirring speed. Based on the discretized population balance, the particle size distribution model was developed. There was a good agreement between the calculated values and the experimental data, which indicated that this model can be used for predicting the agglomerates size distribution at any desired levels of the variables studied.
Duanling Li, Dawei Zheng and Jun Shi
Y. Xiao et al., "Agglomeration of FePO4 Prepared by Continuous Reaction Precipitation", Advanced Materials Research, Vols. 875-877, pp. 95-100, 2014