Compound fluorine removal agent and fluorine-containing wastewater fluorine removal method

Abstract

The invention provides a compound fluorine removal agent and a fluorine-containing wastewater fluorine removal method, and belongs to the technical field of wastewater fluorine removal. The compound fluorine removal agent provided by the invention comprises 20-70 wt% of a trivalent metal source, 10-30 wt% of a calcium source, 10-30 wt% of a magnesium source and 10-20 wt% of hydrophosphate, wherein the trivalent metal source comprises an aluminum source and / or an iron source. Under the combined action of the aluminum source and / or the iron source, the calcium source, the magnesium source and the hydrophosphate, fluoride generated by fluorine ions in the fluorine-containing wastewater can be accelerated to be rapidly increased and separated out in the form of precipitation floc, the precipitation time of the fluorine ions is effectively shortened, and the removal rate of the fluorine ions is larger than 99%. Further, deep fluorine removal is carried out through combined use of fluorine ion adsorption, the total removal rate of fluorine ions in the fluorine-containing wastewater is increased to 99.9% or above, and the fluorine removal effect is remarkable; and in addition, fluorine ion adsorption can be regenerated in a simple and low-cost mode, and recycling of fluorine ion adsorption can be achieved.

Description

Technical field [0001] The present invention relates to the field of wastewater excess fluorine, and more particularly to a compound type definition and fluorine-containing process. Background technique [0002] Treatment method of fluorine-containing industrial wastewater mainly has adsorption, electrocoagonization, reverse osmosis, ion exchange method, chemical precipitation method, and concrete settlement method. These treatment methods have their advantages and lacks, of which the ion exchange cost is high, and the water quality requirements of wastewater are strict, and the regeneration is complex; the electrical gratum and reverse osmosis devices are complex, the equipment is expensive, the power consumption is large, and the operation level is expensive. High requirements, therefore very much; chemical precipitation method treatment of fluorine-containing wastewater, simple process, reasonable and controllable, is a method of treating fluorine-containing wastewater in the ...

AI Technical Summary

Problems solved by technology

These treatment methods have their own advantages and disadvantages. Among them, the ion exchange method has high cost and strict requirements on the quality of wastewater, and the regeneration operation is complicated; The requirements are high, so they are rarely used; the chemical precipitation method is the most widely used method for treating fluorine-containing wastewater because of its simple process and reasonable and controllable cost.

The traditional calcium salt precipitation method is mainly to add calcium oxide (CaO), calcium hydroxide (Ca(OH)2), calcium chloride (CaCl2 ) and other calcium salts, calcium salts react with fluoride ions in wastewater to form CaF2 precipitates, but this method is used to treat fluoride-containing wastewater, the solubility of fluoride is high, and the precipitation process is slow