초록 ▼

The addition of calcium sulfate to an alkali metal aluminum phosphate slurry prior to drying provides an improved process which results in a cleaner reactor, easier drying and granulation, increased production rates, a decreased mill heat requirement and a product having an increased density which i

The addition of calcium sulfate to an alkali metal aluminum phosphate slurry prior to drying provides an improved process which results in a cleaner reactor, easier drying and granulation, increased production rates, a decreased mill heat requirement and a product having an increased density which is less dusty allowing for easier handling, and substantially non-hygroscopic which avoids caking and blinding of classifier screens.

대표청구항 ▼

In a process for the preparation of an alkali metal aluminum phosphate which comprises: (a) contacting a food grade phosphoric acid having a concentration of about 70.0 to about 90.0 weight percent H3PO4 with a sufficient amount of an alkali metal ion selected from the group consisting of sodium, po

In a process for the preparation of an alkali metal aluminum phosphate which comprises: (a) contacting a food grade phosphoric acid having a concentration of about 70.0 to about 90.0 weight percent H3PO4 with a sufficient amount of an alkali metal ion selected from the group consisting of sodium, potassium and mixtures thereof and aluminum ion to form an alkali metal aluminum phosphate in a slurry; and (b) drying the alkali metal aluminum phosphate; the improvement which comprises: (1) contacting said alkali metal aluminum phosphate slurry with calcium sulfate subsequent to the initial formation of the alkali metal aluminum phosphate slurry in step (a) and prior to the completion of the drying in step (b).