NITROGEN-SULPHURIC FERTILIZERS BASED ON AMMONIUM NITRATE MELT AND PHOSPHOGYPSUM
Abstract
To obtain samples of nitrogen-sulphur fertilizers, the mass ratio of AS : FG was varied from 100 : 0.5 to 100 : 20. It was shown that the crystallization temperature of the nitrate melt decreases from 165 to 152°C. In the products, an increase in the water-soluble form of calcium from 0.06 to 2.86% indicates the reaction of ammonium nitrate with calcium sulfate dehydrate to form calcium nitrate and ammonium sulfate. At the studied ratios of AS : FG = 100 : (0.5 ÷ 20), the strength of the product granules increases from 4.09 to 7.67 MPa. At the same time, the caking of the product decreases from the initial 5.62 kg / cm2 to 1.83 kg / cm2 in the product, almost 3.1 times. Granules of gypsum-containing AS dissolve in water much more slowly than pure AS. Phosphogypsum in the composition of saltpeter promotes its conversion, and with an increase for additive, it increases.
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