| 摘要 |
Crystalline aluminosilicate Type Y zeolite is prepared by reacting silica, alumina, sodium hydroxide and water to produce a slurry of Type Y zeolite and excess silicate containing mother liquor. Silicate is recovered from the mother liquor as precipitated silica/alumina hydrogel by the addition of an acid aluminum salt such as aluminum sulfate. The precipitated silica/alumina hydrogel is used in the zeolite reaction step as a source of silica and alumina.
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