| 摘要 |
PURPOSE:To obtain a inexpensive zeolite and to produce a zeolite contg. A-type and X-type zeolite as well as P-type zeolite also by allowing the finely pulverized coal ash to cause thermal-reaction in an aq. soln. of caustic alkali and repeatedly using the reaction filtrate. CONSTITUTION:The coal ash is finely pulverized and allowed to crystallize by heating in the aq. soln. of caustic alkali. Then the solid matter is filtered and obtained from the reaction mixture and dried after washing with water. On the other hand, the filtrate is added to the pulverized new coal ash and is repeatedly used while adjusting the molar ratio of silica/alumina. The A-type zeolite is easily obtained by adjusting the molar ratio of silica/alumina to about 0.1-2 and the X-type zeolite is easily obtained by adjusting the above-mentioned ratio to about 2-5.
|
