System for recovering acid and alkali from nitric acid wastewater

The utility model discloses a system for recovering acid and alkali from nitric acid waste water, which comprises an alkali adding and filtering unit, a concentration unit and a separation and recovery unit, the alkali adding and filtering unit comprises a stock solution tank, a regulating tank, a sodium carbonate dissolving tank, a liquid alkali tank, a filter and a slurry tank, the outlet end of the stock solution tank is communicated with the inlet end of the regulating tank through a stock solution pump, and the outlet end of the filter is communicated with the outlet end of the slurry tank. A discharge port of the sodium carbonate dissolving tank is communicated with a dosing port of the adjusting tank through a sodium carbonate pump, and a discharge port of the liquid caustic soda tank is communicated with the dosing port of the adjusting tank through a liquid caustic soda pump; according to the device, high-efficiency recovery of acid in the nitric acid wastewater is comprehensively considered, the rec