Abstract
The boron emission into air and water during the use of fluorine-free mold flux containing boron was systematically investigated to evaluate the corresponding environmental impacts. Unexpectedly, boron in mold flux was volatilized in the form of NaBO2 particulate matter as Na2O was added to mold flux. Besides, boron remained in the used mold flux residue was found to be linearly released into leachate continuously, and Na+ existed in the borosilicate network accelerated the hydrolysis of the network and the dissolution of boron by increasing no-bridging oxygen and converting BO4 groups into fragile BO3 groups. Considering the negative effect of Na2O on the stabilization of boron in mold flux, limiting the addition of Na2O in fluorine-free mold flux containing boron will further minimize the pollution originating from the use of mold flux.
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