Production technology of nitrogen-sulphur-calcium fertilizers on the base of urea and phosphogypsum
BOROWIK M., MALINOWSKI P., BISKUPSKI A., DAWIDOWICZ
M., SCHAB S., RUSEK P., IGRAS J., KĘSIK K.
Please cite as: CHEMIK 2012, 66, 5, 525-534
Studies on preparation possibility of granular fertilizers of calcium sulfate and urea adduct type by granulation of urea-phosphogypsum pulp were carried out. The effect of various additives on granule hardness of this type fertilizers was investigated. It was found that addition of magnesium sulfate in various forms increased the granule mechanical strength. Bentonite addition also increased hardness of granules. Agricultural usefulness of the fertilizers was confirmed in field tests.
Keywords: adduct, fertilizer, phosphogypsum, urea