Defluorination flocculant and preparation method thereof

Abstract

The invention discloses a defluorination flocculant and a preparation method thereof. The defluorination flocculant is characterized in that: the defluorination flocculant mainly comprises a permanganic acid composite salt with hydroxy groups; the permanganic acid composite salt has a solid state and a liquid state; the solid permanganic acid composite salt is purple in color and granular in state, and does not air-slake and deteriorate; and the liquid permanganic acid composite salt is aubergine in color. The invention also provides the preparation method of the defluorination flocculant. The defluorination flocculant and the preparation method thereof which are adopted in the invention allow F<-> in waste water containing fluorine to be effectively removed, so the pollution of the polysilicon solar cell industry to environment is reduced.

Description

technical field [0001] The invention relates to a flocculant and a preparation method thereof, in particular to a fluorine-removing flocculant and a preparation method thereof. Background technique [0002] With the global development and utilization of solar technology, the polysilicon solar cell industry has developed rapidly. However, in the current polysilicon solar cell industry, a large amount of fluorine-containing wastewater will be produced, which is very serious for environmental pollution. At present, the treatment of fluorine-containing wastewater is still stagnant in the traditional "fluoride removal process". This process is to add calcium carbide slag or lime to the fluoride-containing wastewater, and increase the Ca 2+ content so that F - form CaF 2 Precipitation removed. However, no matter how this defluorination process increases Ca 2+ The content can only make the effluent water quality contain F - The amount of fluorine drops to about 20mg / L-30mg / L,...

AI Technical Summary

Problems solved by technology

However, no matter how this defluorination process increases Ca 2+ The content can only make the effluent water quality contain F - The amount of fluorine is reduced to about 20mg / L-30mg / L, while the national first-level sewage discharge standard is less than 10mg / L, and the human drinking water hygiene standard allows the fluorine content to be 0.5mg / L-1mg / L

and in order to increase Ca 2+ content, calcium chloride, polyaluminum chloride (PAC) and polyacrylamide (PAM) are added to the fluorine-containing wastewater, so that the salt content in the water is extremely high, and the acetic acid and ethylene glycol contained in the fluoride-containing wastewater Waiting for organic matter without any removal measures, so that the chemical oxygen demand (COD) of the water quality exceeds the standard

Images