| 摘要 |
<p>The walls of heat exchangers which are covered with encrustations of titaniferous material (formed during the attach of ores) are cleared by treatment with an aq. liquor comprising 3-30 wt.% hexafluosilicic acid and is not >10 wt.% Hf. Specifically, the H2SiF6 is applied alone to the encrustations and Hf is added to the H2SiF6 as the encrustations dissolve, to continuously rgnerate H2SiF6. Process is fast and effective, 80-100% of the scale being removed.</p> |
