Method for preparing lithium iron phosphate from ferrophosphorus slag and application of lithium iron phosphate

The invention provides a method for preparing lithium iron phosphate by utilizing ferrophosphorus slag and application thereof, and the method comprises the following steps: dehydrating and decarburizing the ferrophosphorus slag, compounding with battery-grade iron phosphate, and performing lithiation reaction with a raw material lithium source and a carbon source to generate lithium iron phosphate, according to the invention, the ferrophosphorus slag is used as a raw material, so that iron and phosphorus element resources contained in the ferrophosphorus slag can be utilized, and beneficial impurity elements contained in the ferrophosphorus slag, such as a titanium element, can also be utilized, so that the ferrophosphorus slag is used as a doping agent. Meanwhile, under the compounding of battery-grade lithium phosphate, the influence of other impurity elements such as aluminum element which are harmful to doping due to overhigh content is reduced, so that the optimal doping effect is achieved, and the perf