| 摘要 |
<p>PURPOSE:To increase adsorbing capacity for a matter to be adsorbed, by exchanging the sodium ion of sodium A type zeolite with a calcium ion in an exchange ratio of 80% or more. CONSTITUTION:A silica source, an alumina source and alkali are crystallized by hot water to obtain zeolite A. The obtained zeolite A is contacted with a solution containing a calcium ion to exchange ion exchangeable sodium in zeolite A with the calcium ion. The exchange ratio o calcium is adjusted to 80% or more, pref., 90% or more. The ion exchanged zeolite A is mixed with a caking agent, a binder and water and, after kneading, the kneaded mixture is molded by extrusion.</p> |
