Method for preparing sludge with strongly-acidic fluorine-containing waste water to prepare calcium fluoride concentrate

Abstract

The invention discloses a method for preparing sludge with strongly-acidic fluorine-containing waste water to prepare calcium fluoride concentrate. The method includes the steps that 1, calcium fluoride sludge is pre-treated and pulped after being treated, the calcium fluoride sludge, a trapping agent, a foaming agent and an adjusting agent are mixed and stirred, and the mixture is subjected to flotation, wherein the trapping agent is one or more of oleic acid, sodium alkyl sulfate, sodium naphthenate and modified fatty acid salt compound sodium dodecyl benzene sulfonate, the foaming agent isone of terpenic oil, methyl isobutyl carbinol and butyl ether oil, and the agenting agent is prepared from an activator, an inhibitor, a dispersant sodium carbonate and a flocculant; 2, the calcium fluoride sludge obtained after flotation is mixed with an acid solution; 3, the calcium fluoride sludge obtained after being treated in the second step is mixed with a fluorine-containing solution; 4, acalcium fluoride sludge mixture obtained after being treated in the third step is neutralized through an alkaline solution, the calcium fluoride sludge mixture is after-treated, and the calcium fluoride concentrate is obtained. The method has the advantages of being high in refining degree and achieving resource utilization of multiple industries.

Description

technical field [0001] The invention belongs to the field of reuse of waste resources, and relates to the reuse of strongly acidic fluorine-containing wastewater treatment sludge, in particular to a method for preparing calcium fluoride concentrate by using the strong acid fluorine-containing wastewater treatment sludge. Background technique [0002] China's photovoltaic industry and semiconductor industry are developing rapidly, and the scale of the industry is expanding rapidly. There are a variety of fluorine raw materials and products based on fluorine raw materials, and fluorine pollution also follows. Among them, solar panels use a large amount of hydrofluoric acid in the production process, and the use of a large amount of hydrofluoric acid also produces a large amount of high-concentration fluorine-containing wastewater. In order to treat fluoride-containing wastewater, a large amount of inorganic fluoride-containing sludge will be produced. [0003] The composition ...

AI Technical Summary

Problems solved by technology

[0004] At present, most enterprises adopt storage or landfill method for calcium fluoride sludge, but the disposal capacity of landfill is limited, and the landfill pollution control standard has strict control requirements for inorganic fluoride, and the requirements for landfill are extremely high At the same time, it also causes waste of fluorine resources and land resources; it is used as cement mineralizer, iron and steel metallurgy co-solvent, and slagging agent, but the amount of use is low; it is used as a source of raw materials for brick making, considering the use of fluorine-containing solid waste to produce Bricks lack corresponding product quality and pollution control standards, and marketization is not widely used