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ÀWỌN OHUN WÍWỌ̀
Ammonium Dihydrogen Phosphate from Superphosphate: Lagrange's Process
Monoammonium phosphate from superphosphate, by Lagrange's process (Thorpe, 1912). Water and steam wash the soluble phosphate out of the superphosphate. A little barium carbonate takes out the gypsum still dissolved, and ammonia in slight excess throws down the last of the lime. The clear liquor holds the salt.
The picture: our own drawing.
Àárín
2 days
Ìlànà
1
1
Leach the superphosphate
Leach the superphosphate
Stir the superphosphate with hot water and steam. Let the calcium sulfate (gypsum) settle and draw off the solution; Lagrange's came to about 42 °Tw.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Superphosphate ẹfun1 kgÀwọn irinṣẹ́ tí a nílò:
Ìkòkò olódi gíga
Omi
Òǹwọ̀n ìwúwo omi2
2
Take out the dissolved gypsum
Take out the dissolved gypsum
Some gypsum stays dissolved. Add barium carbonate carefully, a little at a time, then filter.
Àwọn irinṣẹ́ tí a nílò:
Barium carbonate (witherite)
Aṣọ ìsẹ́ òwú-àpò tí ó kéré
Ìgò Gílásì3
3
Add ammonia
Add ammonia
Wear gloves; ammonia stings. Add ammonia until in slight excess: all the lime comes down as a phosphate. Filter it off (it can go back into making superphosphate).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi amonia - 25-28 %1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìbọ̀wọ́ NítírílìAṣọ ìsẹ́ òwú-àpò tí ó kéréÌgò Gílásì4
4
Crystallise the salt
Crystallise the salt
The clear liquor, at about 32 °Tw, holds the monoammonium phosphate. Evaporate it in a dish to crystallise the salt.
Àwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìwúwo omi
Àwo ÌgbẹÀwọn ohun-èlò
2- Àyè
- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
8- Àyè
- Àyè
- Àyè
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