Method for preparing battery grade lithium carbonate by using salt lake lithium carbonate

The invention discloses a method for preparing battery grade lithium carbonate by using salt lake lithium carbonate, which belongs to the technical field of battery materials, and comprises the following steps: leaching the salt lake lithium carbonate with an acid solution, reacting with a sodium carbonate solution after acid leaching, carrying out filter pressing to obtain crude lithium carbonate, washing the crude lithium carbonate with water to obtain a first water washing solution, and drying the first water washing solution to obtain a second water washing solution; leaching the washed lithium carbonate with an acid solution again, adding calcium hydroxide to adjust the pH value to 10-12, removing impurities to obtain an impurity-removed solution, adding sodium carbonate into the impurity-removed solution, uniformly stirring to obtain a mixed solution, passing the mixed solution through a resin column, adsorbing and removing calcium to obtain a calcium-removed solution, reacting the impurity-removed solu