Hydrolytic agent for treating wastewater containing tetrafluoroborate and application thereof

Abstract

The invention provides a hydrolytic agent for treating wastewater containing tetrafluoroborate and application thereof. The hydrolytic agent consists of at least one aluminum salt and at least one water-soluble cerate. The aluminum salt is selected from alum, aluminum chloride or hydrate of the aluminum chloride, aluminum sulfate or hydrate of the aluminum sulfate, and preferable the alum; and the water-soluble cerat is selected from cerium nitrate, cerous sulfate and cerium chloride, and the preferable the cerium chloride. The hydrolytic agent disclosed by the invention is used for treating the wastewater containing tetrafluoroborate, thus the consumption of the aluminum salt contained in the hydrolytic agent can be reduced on the one hand and the concentration of the tetrafluoroborate in the hydrated wastewater can be reduced on the other hand, which provide advantages for subsequent treatment. After the wastewater is continuously precipitated by lime milk or CaOH2, the concentration of the tetrafluoroborate and the concentration of fluorinion are respectively reduced and reach the discharge stand, and thus the etrafluoroborate and the fluorinion can be directly discharged and further the subsequent treatment flow is shortened.

Description

technical field

[0001] The invention relates to a hydrolyzing agent for treating fluorine-containing borate waste water and its application, in particular to a hydrolyzing agent for treating fluorine-containing borate waste water and its application. Background technique

[0002] Fluoroboric acid is a very stable compound in which fluorine is coordinated to boron. Due to the good throwing ability of the fluoroboric acid plating solution, the fast deposition rate and the stability of the plating solution, the electroplating containing fluoroboric acid has been widely used in printed circuit boards and automobile bearing bushes, as well as composite electroplating of some ternary metals. The electroplating wastewater discharged from the production process contains a large amount of BF 4 - , it will slowly hydrolyze in water, releasing a large amount of F during hydrolysis - , resulting in serious fluorine pollution. Fluorine pollution is increasingly concerned by people. I...