| 摘要 |
<p>Calcium hydroxides are produced which are particularly suited for the purification of gases and exhaust gases. For this purpose, substances are added to the slaking water for dead-burnt line which enhance the reactivity of Ca(OH)2. These substances are alkalis such as NaOH or hydrate-forming substances such as CaCl2 or hydroxide-forming substances such as FeCl3. In addition, Hg-binding compounds such as NaHS or trimercapto-s-triazine can be deposited on Ca(OH)2. A further group of substances includes the heavy metals present in several oxidation stages, such as chromium, manganese, vanadium and similar, which act as catalysts. Surfactants such as activated carbon and silica gel can also be combined with Ca(OH)2, thereby precipitating Hg and noxious acidic residues, for example HCl and SO2.</p> |
