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The preparation of phosphotungstic acid and of sodium and barium phosphotungstates

✍ Scribed by Phillips, M. A.

Publisher
Wiley (John Wiley & Sons)
Year
1950
Weight
364 KB
Volume
69
Category
Article
ISSN
0368-4075

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✦ Synopsis

Operation ?uitli Nea~ Caledonian ore

The process operated efficiently for 12 cycles with almost constant chromic anhydride yields and separations of ferric and aluminium sulphates, alrhough the magnesium sulphate concentration in the liquors steadily increased.

FIG. 9. Effrcr of corrriitrred rec.scliig oil srtlphlrric acid coirsroirpriou

From Fig. it can be seen that it is an advantage to recycle the acid, since with each successive cycle the effect of discarding filtered mother liquor on the quantity of sulphuric acid required per pound of chromic anhydride is reduced.

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