Assertion: phosphoric acid's impurity | /r/HasProperty | shown effective
Facets:
value: in prior art processes
type: TEMPORAL
value: at relatively short processing time
type: TEMPORAL
Source sentences:
text: The central feature of the present invention is that a method has now been provided by which impurities, especially metal ion impurities, can be precipitated from wet process phosphoric acid at lower N/P 2 O 5 weight ratios than shown effective in prior art processes, at relatively short processing time, and which can be separated from the product phosphoric acid at acceptable rates and P 2 O 5 yields.