Defluorination flocculant for filtering out fluorine ions in frosting waste liquid, and use method thereof

Abstract

The invention discloses a defluorination flocculant for filtering out fluorine ions in a frosting waste liquid. The defluorination flocculant is prepared from, by mass, 32-40% of sodium chloride, 20-30%of calcium chloride, 36.8-39.8%of alum and 0.2% of polyaluminum chloride. The invention also discloses a use method of the defluorination flocculant for filtering out fluorine ions in the frosting waste liquid. The use method comprises the following steps: (1) proportionally preparing sodium chloride, calcium chloride, alum and polyaluminum chloride, mixing, and crushing to 200 meshes or less toobtain the defluorination flocculant; (2) adding the defluorination flocculant in step (1) into the frosting waste liquid; and (3) naturally flocculating and settling the frosting waste liquid for 2-3 hours, concentrating sludge, and finally discharging residues through a filter press. The method has the advantages of being simple, small in adding amount, convenient to treat, high in fluoride removal rate, small in waste residue amount, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of frosting waste liquid treatment, and in particular relates to a fluorine-removing flocculant for filtering out fluoride ions in the frosting waste liquid and a use method thereof. Background technique [0002] With the continuous improvement of environmental protection, the emission concentration index of harmful fluoride ions in the glass industry frosting waste liquid has attracted more and more attention, and has become an important assessment index for whether the waste liquid discharge of the industrial frosting industry meets the standard. At present, the glass frosting waste Lime milk neutralization treatment process or activated alumina ball adsorption treatment process is generally used for liquid treatment, but lime milk neutralization process will use a large amount of lime milk, which will generate a large amount of hazardous solid waste, which will affect the later stage. The disposal of soli...

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Problems solved by technology

[0002] With the continuous improvement of environmental protection, the emission concentration index of harmful fluoride ions in the glass industry frosting waste liquid has attracted more and more attention, and has become an important assessment index for whether the waste liquid discharge of the industrial frosting industry meets the standard. At present, the glass frosting waste Lime milk neutralization treatment process or activated alumina ball adsorption treatment process is generally used for liquid treatment, but lime milk neutralization process will use a large amount of lime milk, which will generate a large amount of hazardous solid waste, which will affect the later stage. The disposal of solid waste slag brings huge disposal costs; while the activated alumina ball adsorption treatment process requires frequent regeneration, low adsorption capacity, and high cost