It is applied to the sodium desulfurization of lead paste from used batteries and the purification production of sodium sulfate.

To ensure the acquisition of qualified sodium sulfate, the sodium sulfate solution needs to be treated to remove a small amount of heavy metal ions, sodium carbonate and other impurities. Heavy metal impurities in sodium sulfate solution are purified and removed by flocculation-filtration. A small amount of sodium carbonate is removed by reacting with sulfuric acid. After the above treatment, the solution is filtered and enters the inspection tank. If it is qualified, it is transported to the crystallization area