| 摘要 |
<p>A process is disclosed for obtaining a granular zeolite from naturally occurring argillaceous material. The invention relates to the field of processing natural materials, in particular the production of granular synthetic zeolites. The invention permits the use of a wide range of natural clays, widens the raw material base for manufacturing granular synthetic zeolites, and boosts the active zeolite content in the granules. To these ends the initial raw material is mixed with a neutral aluminium salt and caustic soda, aluminium hydroxide or silicon dioxide being introduced into the reaction mixture at the same time; the mixture is subjected to steam-heat treatment followed by thermal activation, and is then mixed with an alumino-silico-hydro gel until a homogenous slurry is formed. The neutral aluminium salt used can be, for example, aluminium sulphate. The argillaceous raw material, neutral aluminium salt and sodium hydroxide are mixed in the following respective proportions: 100 : 0.05 : 0.02. The mixture is steam-heat treated for 10 to 60 minutes at a temperature of 110 to 250 °C.</p> |
