Process for removing oxalate from Bayer process seeded precipitation mother liquor

The invention belongs to the technical field of metallurgy, and particularly relates to a process for removing oxalate from Bayer process seeded precipitation mother liquor. The method includes the steps of: performing primary cooling on the group C mother liquor and the low-evaporation mother liquor by a spiral plate heat exchanger through a mother liquor pump, and mixing in a 9 # washing settling tank; conveying the mixed mother liquor in the No.9 washing settling tank to a plate-and-frame filter press through an underflow pump to filter suspended matters, and returning a filter cake to a seed precipitation system; performing secondary cooling on the filtrate in the step 2 through a spiral plate heat exchanger; feeding the filtrate into a reaction tank, and after the filtrate reaches a specified liquid level, adding a sodium oxalate crystallization growth substance for a removal reaction; feeding the mother liquor obtained after reaction in the fourth step to a plate-and-frame filter press through a mother