| 摘要 |
<p>The invention is directed to an agent to remove contaminants from water used in the production of paper and related products, of the general formula: (ZO)nAln(OH)n-mClm (or of closely related empirical formula), which, optionally, has been further coated with a polymer, wherein Z is derived from an aluminosilicate material. The agent is prepared by activating the aluminosilicate material by treating with acid or by subjecting the material to ammonium ion exchange and then heating the thus activated material in the presence of a cationic agent, followed by coating with a polymer. The preferred aluminosilicate is a zeolite-containing mineral of a clinoptilolite structure and the preferred cationic agent is selected from polyaluminiumchloride, epichlorohydrin (or a polymer derivative thereof) or dicyanodiamide. The preferred coating polymer is polyacrylamide. Use of the agent leads to production increase, reduction of sludge generation, reduction of contaminant load, reduction in chemical oxygen demand and a cost saving.</p> |
