NPK complex fertilizer

Details NPK complex fertilizer NPK complex fertilizer

1985-09-11

1987-12-15

Lander, Ferris H.

Chemistry: fertilizers

Processes and products

Inorganic material

71 60, 71 62, 71 63, C05D 102

Patent

active

047131080

ABSTRACT:
The present invention relates to NPK-fertilizer manufactured during application of KCl and/or K.sub.2 SO.sub.4 as potassium source and which also contains magnesium in an amount of 0.2-3.0% calculated as MgO and added in the product as MgO, and method for manufacture of this product. The special features of the method is that to an evaporated nitrogen, phosphorous solution 0.2-3.0% reactive MgO and potassium salts are added before prilling or before/during granulation. MgO is preferably added as lightly calcined MgO having an average particle size of 0.2-3.0 mm, and is added in the mixer just before the prilling means. The new product has reduced tendency to swelling and caking.

REFERENCES:
patent: 3291594 (1966-12-01), Nickerson
patent: 3926609 (1975-12-01), Effmet et al.
CA69 (20):788532, Granular Potassium Chloride, 1967, Perlmutter et al.

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