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Dolomite로부터 고토인안비료 제조의 기초적 연구
A Studies on Magnesium Ammonium Phosphate Fertilizer from Dolomite
HWAHAK KONGHAK, February 1972, 10(1), 7-12(6), NONE
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Abstract
This investigation was carried out to produce a high quality magnesium compounded fertilizer by initially dissolving calcined dolomite in sea water to form the intermediate Mg（OH）2 precipitate, and reacting this intermediate with phosphoric acid and ammonia thereafter.
The experimental results were obtained as follows ;
1） The optimum calcination temperature of dolomite was about 950 ℃ for 30 minutes operation and in the displacement of the calcined dolomite in sea water, the optimum mole ratio of calcium hydroxide to magnesium chloride is 1 : 1.2 for 4 hours of the dissolution time.
2） The high yield of the magnesium compounded fertilizer was obtained, when the precipitate was reacted with 20 % phosphoric acid and neutralized with 28 % ammonium hydroxide thereby obtaining the alkalinity of the solution to pH 9.
3） By the results of X-ray diffraction and chemical analysis, the major component of the product was magnesium ammonium phosphate at the above condition and the fertilizing effect was also good.
The experimental results were obtained as follows ;
1） The optimum calcination temperature of dolomite was about 950 ℃ for 30 minutes operation and in the displacement of the calcined dolomite in sea water, the optimum mole ratio of calcium hydroxide to magnesium chloride is 1 : 1.2 for 4 hours of the dissolution time.
2） The high yield of the magnesium compounded fertilizer was obtained, when the precipitate was reacted with 20 % phosphoric acid and neutralized with 28 % ammonium hydroxide thereby obtaining the alkalinity of the solution to pH 9.
3） By the results of X-ray diffraction and chemical analysis, the major component of the product was magnesium ammonium phosphate at the above condition and the fertilizing effect was also good.
