Method for recycling acid wastewater in viscose fiber production

The invention relates to a method for recycling acid wastewater in viscose fiber production, and belongs to comprehensive utilization of viscose fiber production wastewater. On the basis that washingwater of a wool distribution groove of a spinning refiner and washing water of primary washing are merged, the wastewater is divided into two parts, which are collected individually, high concentration acidic wastewater and low concentration acidic wastewater are formed; then high concentration acidic wastewater is delivered to an evaporation device to carry out one-step concentration; after evaporation, one part of the acid bath is introduced into the main circulation of an acid station, the excess acidic wastewater is introduced into a crystallization device to separate out salt cakes; and then salt cakes are burned and separated to obtain anhydrous sodium sulfate. The wastewater is divided into acidic wastewater with different concentrations; the high concentration acidic wastewater isintroduced to an acid bath