Method for treating and recycling divalent manganese in electrolytic manganese wastewater

The invention discloses a method for treating and recycling divalent manganese in electrolytic manganese wastewater. The method comprises the following steps: step 1. removing manganese ions in the wastewater by using a hydroxide precipitation method, to be specific, step 11. pretreating the wastewater, step 12. adding hydroxide, stirring for reaction, and then adding a flocculating agent, step 13. precipitating so as to carry out mud-water separation, step 14. generating precipitates, and step 15. carrying out filter pressing on mud so as to form mud cakes, and recycling the mud cake for production; and step 2. treating the wastewater obtained in the step 13 by adopting a divalent manganese and ammonia nitrogen recycling method, to be specific, step 21. pretreating resin, step 22. adsorbing, and step 23. regenerating the resin. The method has the beneficial effects that the precipitation method and an ion exchange method are organically combined, and the precipitation method can be used for reducing treatmen