| 摘要 |
1536027 Preparing pyrophosphates CARBORUNDUM CO 30 Jan 1976 [7 Feb 1975] 03718/76 Heading C1A Pyrophosphates are prepared by heating a blend of an oxide or oxides with a stoichiometric excess of at least 40% of a source of P 2 O 5 to a reaction temperature at a rate of at least 200 C. degrees per hour, maintaining the temperature, preferably 700-750‹ C., for at least 4 hours and cooling. The preferred oxides are ZrO 2 , SiO 2 .¢H 2 O or a mixture of the two.
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