The effect of various fluorine-containing chemical additives on the dissolution of colloidal silica is systematically studied. These silica scale dissolvers are ammonium bifluoride (NH 4 ·HF 2 ), ammonium fluoride (NH 4 F), sodium tetrafluoroborate (NaBF 4 ), and disodium fluorophosphate (Na 2 PO 3 F). The most effective dissolver was NH 4 ·HF 2, which was extensively studied at the pH range 2–7. The highest dissolution efficiency was demonstrated in the pH range 2–4. The dissolution capability of Na 2 PO 3 F was monitored not by the silicomolybdate method, but on the basis of a weight-loss approach. It showed substantial dissolution ability at pH’s 7 and 9.
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Demadis et al. (2012) studied this question.
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