Method for preparing ternary nitric acid molten salt phase change heat storage material

The invention discloses a method for preparing a ternary nitric acid molten salt phase change heat storage material. The method comprises the steps of 1, weighing sodium nitrate, potassium nitrate and neodymium nitrate, and crushing sodium nitrate, potassium nitrate and neodymium nitrate through a mechanical crushing method to obtain sodium nitrate powder, potassium nitrate powder and neodymium nitrate powder; 2, mixing the sodium nitrate powder, the potassium nitrate powder and the neodymium nitrate powder to obtain a ternary nitric acid molten salt phase change heat storage material prefabricated body; 3, first melting the ternary nitric acid molten salt phase change heat storage material prefabricated body and then sequentially performing drying and ball milling crushing treatment to obtain the ternary nitric acid molten salt phase change heat storage material. According to the method for preparing the ternary nitric acid molten salt phase change heat storage material, the problems that an existing molten salt phase change heat storage material is high in cost, long in production cycle and complex in process in the preparation process are solved, and the prepared ternary nitric acid molten salt phase change heat storage material has the advantages of being wide in use temperature range, high in heat storage capability, low in corrosiveness and good in liquidity.