Method for treating scrapped positive electrode slurry, and application

Disclosed are a method for treating a scrapped positive electrode slurry, and an application. The method comprises the following steps: pretreating a scrapped positive electrode slurry to obtain a slurry solution; performing electrophoretic coagulation and pressure filtration on the slurry solution to obtain a liquid phase and a solid phase; and performing gradient roasting on the solid phase to obtain a positive electrode material. According to the method of the present invention, a scrapped positive electrode slurry is used as a raw material, and the scrapped positive electrode slurry is recovered using crushing, sorting, electrophoresis, and gradient roasting processes, without introducing a flocculating agent. The present invention has the advantages of thorough separation between an NMP solution and positive electrode powder, high recovery rates of organic matters and valuable metals, high production efficiency, etc., and thus not only improves economic benefits, but also reduces environmental pollution.