| 摘要 |
<p>A process for the removal of contaminants, such as colour bodies, from a liquor comprises a combination of two or more of carbonatation, phosphatation and sulphitation of the liquor to form a precipitate comprising at least some of the contaminants from the liquor. The process also comprises separation of the precipitate from the liquor. The process may be utilised in a sugar refining process or as a water decontamination process. Preferably, the process involves the introduction of phosphoric acid or sulphur-based acid into the liquor; and the introduction of carbon dioxide into the liquor. The carbon dioxide gas can be introduced into the liquor by bubbling or, alternatively, the carbon dioxide may be generated by adding a metal carbonate to the liquor which will react with phosphoric acid in the liquor. If the carbon dioxide is introduced into the liquor by bubbling, then the carbon dioxide can be recycled and reintroduced into the liquor. A foam or froth flotation step can be utilised to separate the precipitate from the liquor. Suitably, a surfactant is introduced into the liquor. The amount of precipitate can be moderated by the addition of a calcium salt.</p> |
