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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.
中级
2 days
说明
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.
此步骤所需材料：
过磷酸钙1 公斤所需工具：
高壁炖锅
水
比重计2
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.
所需工具：
碳酸钡（毒重石）
细棉滤布
玻璃罐3
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).
此步骤所需材料：
氨水 25-28 %1 as required所需工具：
丁腈手套细棉滤布玻璃罐4
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.
所需工具：
比重计
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