| 摘要 |
<p>Method for producing soluble acid polyphosphates with an Na/P ratio of 0.3 to 0.6, a P2O5 content of over 77 % wt., a Na2O content of under 20 % and a residual water content of 3 - 10 %, wherein an aqueous phosphate solution is dried in order to form chain-like polyphosphates with an average chain length of 10 to 30, and then fused for 30 - 180 minutes at temperatures of 400 - 600 DEG C. The fusion is cooled, forming a vitreous product. During fusion, steam pressure of 1 . 10exp(4) to 5 . 10exp(4) Pa is maintained in the atmosphere in contact with the fusion. Further there are described the polyphosphates produced by this method and their use.</p> |
