Coking desulfurization waste liquid pretreatment device

The utility model provides a coking desulfurization waste liquid pretreatment device, belongs to the technical field of coking desulfurization waste liquid treatment equipment, and is used for removing sulfur and pigment in a coking desulfurization waste liquid. The technical scheme of the coking desulfurization waste liquid pretreatment device is as follows: liquid inlet pipelines of a pressurization pump and a water jetter are connected with a liquid outlet of a flotation tank respectively; liquid outlet pipelines of the pressurization pump and the water jetter are connected with liquid inlets of a dissolved air tank; a liquid outlet pipeline of the dissolved air tank is connected with the flotation tank; a liquid conveying pipeline of a dosing tank is connected with the flotation tank through a dosing pump; and a dross scraper is mounted on the flotation tank. According to the coking desulfurization waste liquid pretreatment device, a desulfurization waste liquid containing a surface active agent is subjected to pressurizing and air dissolving, after the desulfurization waste liquid is subjected to pressure reduction and released through an aerator, foams formed by the surface active agent can perform effective adsorptive separation on an organic matter, a suspended matter and metal ions, and dross is removed by the dross scraper, so that a waste liquid pretreatment purpose is achieved. According to the coking desulfurization waste liquid pretreatment device, the by-product production is low, production of a large amount of activated carbon waste in an activated carbon decoloring technology is avoided, and the pretreatment device has the advantages that the structure is simple, and the using effect is good.