Eq. (3)
Boric acid is mainly present in a condition with the pH value lower than
9.23, and in a higher pH environment, borate ion is the main form. It is
well known that boric and borate ion can react with polyhydroxy
compounds to form complexes[29]. The possible
reaction mechanisms were shown in Fig. 3.
Fig. 2. Effect of simulated brine pH values on boron extraction.
[TMPD] = 0.4 mol/L; O/A = 1.