以肥料级磷酸一铵(MAP)为磷源、硫酸亚铁为铁源，采用均相沉淀法制备电池级磷酸铁，并对制备工艺进行了研究。结果表明：当肥料级MAP与纯水质量比为2∶10、溶解温度为75℃、溶解时间为1.0 h时，肥料级MAP的溶解率为74.52%;溶解液在氨化pH值为7.0、氨化温度为20℃、氨化时间为1 h的条件下除杂，磷损失率为1.9%;当硫酸亚铁溶液与磷铵净化液物质的量比为1.0∶1、pH值为2.0、陈化温度为85～90℃、陈化时间为120 min时，可获得晶型结构完整、铁含量为36.20%、磷含量为20.98%、铁磷比为0.96、平均粒径为235.1 nm的电池级磷酸铁。肥料级MAP制备电池级磷酸铁不仅可以降低磷源成本，而且可为肥料级MAP的高值化利用提供一条可行的途径，具有较好的应用前景。

Using fertilizer-grade monoammonium phosphate(MAP) as a phosphorus source and ferrous sulfate as an iron source, we prepared battery-grade iron phosphate via a homogeneous precipitation method, and investigated the preparation process.The results indicate that the dissolution rate of fertilizer-grade MAP reaches 74.52%,when the mass ratio of fertilizer-grade MAP to pure water is 2∶10,the dissolution temperature is 75 ℃,and the dissolution time is 1.0 h.Under conditions at the ammoniation pH value of 7.0,the ammoniation temperature of 20 ℃,and the ammoniation time of 1 h for impurity removal, the phosphorus loss rate of dissolution solution reaches 1.9%.When the molar ratio of ferrous sulfate solution to ammonium phosphate purification solution is 1.0∶1,the pH value is 2.0,the aging temperature is 85-90 ℃,and the aging time is 120 min, the battery-grade iron phosphate with complete crystal structure, the iron content of 36.20%,the phosphorus content of 20.98%,the iron-to-phosphorus ratio of 0.96,and an average particle size of 235.1 nm can be obtained.The preparation of battery-grade iron phosphate from fertilizer-grade MAP not only reduces the cost of phosphorus sources, but also provides a feasible approach for the high-value utilization of fertilizer-grade MAP,with good application prospects.