Method for removing nitric acid and metal impurities simultaneously

The invention discloses a method for removing nitric acid and metal impurities at the same time, and relates to the technical field of phosphorite processing. The method for removing the nitric acid and the metal impurities at the same time comprises the following steps that a calcium removal solution is subjected to evaporation treatment under the conditions that the temperature ranges from 60 DEG C to 80 DEG C and the vacuum degree ranges from 20 kpa to 50 kpa, filtering is conducted after evaporation treatment is finished, and a crude phosphoric acid solution is obtained; wherein the total content of metal ions in the crude phosphoric acid solution is less than 100 ppm. According to the method for removing the nitric acid and the metal impurities simultaneously, the acidity of the phosphoric acid solution is reduced while the nitric acid is evaporated, heavy metal ions (calcium ions) originally dissolved in the nitric acid and the phosphoric acid solution are combined with phosphate radicals or sulfate rad