Method and system for treating high-fluorine high-hardness wastewater by two-stage two-phase fluidized bed through self crystallization

The invention provides a method and system for treating high-fluorine high-hardness wastewater by a two-stage two-phase fluidized bed through self crystallization. The system comprises two self crystallization fluidized bed reactors (which are respectively recorded as a first-stage reactor and a second-stage reactor), a chemical A adding device, a chemical B adding device, a first-stage material pool and a second-stage material pool, wherein a raw water pool is connected with a water inlet opening of the first-stage reactor through a water inlet pump via a water inlet pipeline; the chemical A adding device is connected with a chemical adding opening of the first-stage reactor through a chemical A adding pipeline; a slag discharging opening of the first-stage reactor is connected with the first-stage material pool through a first-stage reactor mud discharging pipe; a water outlet of the first-stage reactor is connected with a water inlet opening of the second-stage reactor through a first-stage water outlet pi