Graphite purification waste liquid treatment system and graphite purification waste liquid treatment method

The invention belongs to the technical field of waste liquid treatment, and particularly relates to a graphite purification waste liquid treatment system and a graphite purification waste liquid treatment method. According to the invention, the pre-pickling system is introduced to secondarily utilize the waste acid, so that the acid consumption for pickling in the graphite purification process is reduced, and the use efficiency of the acid liquor is improved, thereby reducing the cost of the graphite purification process and obviously enhancing the overall economy. A sodium fluosilicate production line is further introduced, resource utilization of residual fluosilicic acid and fluosilicate in the wastewater is effectively achieved, the operation cost of reagents in the follow-up water treatment process can be effectively reduced, and the produced sodium fluosilicate can be sold to improve economic benefits. Valuable salt in the wastewater is crystallized and recycled by adopting an evaporative crystallizatio