A kind of method for purification and treatment of waste water from vanadium extraction by wet method

Abstract

The invention relates to a method for purifying waste water from vanadium extraction by wet method, which comprises the following steps: S1 adding water and stirring calcium carbide slag, adjusting the water content to 60-70%, and obtaining calcium carbide slag slurry after pressure filtration; S2 adding calcium carbide slag to S1 Add 5-15% of its weight tailings slag into the slurry, stir for 1-5min to obtain a dispersion; S3 introduces the waste water into the treatment tank, and adds the dispersion in S2, which accounts for 5-20% of the waste water weight, and stirs for 2-20% in the treatment tank. 8min; S4, add the calcium carbide slurry obtained in S1 to the wastewater treated by S3, accounting for 50-70% of its weight, continue to stir for 1-4min, and let it stand for 10-30min; S5 collects the supernatant in S4 and puts it in the supernatant Add the calcium carbide slurry in S1, continue to stir and adjust the pH to 9-10, let it stand for 10-30 minutes and press filter; S6 collects the lower sediment obtained in S4 and the filter cake in S5, mixes them and performs press filtration, and the obtained filtrate is mixed with S4 The waste water is combined for treatment; S7 collects the filtrate in S5, which is the clean water obtained after the waste water is purified. The invention does not need to add chemical agents such as sodium carbonate, PAC, PAM, etc., and the steps are relatively simple; it can also remove toxic substances such as arsenic and fluorine in waste water.

Description

technical field [0001] The invention relates to the technical field of purification and treatment of industrial wastewater, in particular to a method for purification and treatment of wastewater from vanadium extraction from stone coal by wet method. Background technique [0002] Stone coal is a unique vanadium resource in my country. In the wet stone coal vanadium extraction process, especially in the wet stone coal vanadium extraction process, a large amount of acidic industrial wastewater will be produced, and the wastewater contains a large amount of metal ions, such as Fe +3 , Fe +2 , Pb +2 , Zn +2 、Cu +2 、Cd +2 , Hg +2 , etc., also contains toxic substances such as arsenic and fluorine, if they are not purified and discharged directly to the environment, it will cause serious ecological damage. [0003] Chinese invention CN101759313A provides a resource treatment method for high-salt-concentration heavy metal-rich wastewater from stone coal extraction of vanadiu...

AI Technical Summary

Problems solved by technology

[0004] This treatment method only adjusts the pH value of the wastewater, and adds various chemicals for precipitation and other operations. At the same time, the supernatant after precipitation needs to be treated by electrodialysis. The steps are cumbersome and the toxic substance arsenic contained in the wastewater is not removed. , fluorine, etc.