What should we pay attention to during the brine refining operation using lime soda ash method? (or operating points)

The dosage of lime is determined based on the content of magnesium ions in the brine, and the dosage of soda ash is determined based on the content of calcium ions. Generally, a certain over-alkalinity is maintained, and 0.5PPM is added to polyacrylamide.

If your brine needs to be directly used to produce alkali, the specific operation control indicators for removing sulfate ions are as follows:: To remove SO42- in brine, the amount of barium chloride required① m1=2.54 (C1-0.2)V. To remove Ca2+ in brine, the amount of sodium carbonate required② m2=2.64C2V+0.1V. To remove Mg2+ in brine, the amount of sodium hydroxide required③ m3=3.29C3V+0.2V.: m1, m2, and m3 are the amounts of barium chloride, sodium carbonate, and sodium hydroxide required respectively. ； C1, C2, and C3 are the concentrations of SO42-, Ca2+, and Mg2+ in brine respectively. ； V is the volume of the batch of brine in the settler. The 0.2 in ① is the retained SO42- content (g/L). Its purpose is to ensure that the Ba2+ reaction is complete. The 0.1V in ② is the amount of excess sodium carbonate added. The purpose It is to completely react the Ca2+ in the brine to be treated. ③ 0.2V is the amount of excess sodium hydroxide added, and the purpose is to completely react the Mg2+ in the brine to be treated. The amount of polyacrylamide is 0.5ppm (solid)