Title: Method for making nitrogen-potassium fertilizer containing calcium nitrate and products thereof
Application Number: 96199082 Application Date: 1996.10.18
Publication Number: 1204309 Publication Date: 1999.01.06
Approval Pub. Date: 2003.04.02 Granted Pub. Date: 2003.04.02
International Classifi-cation: C05C5/02
Applicant(s) Name: Norsk Hydro ASA Address:
Inventor(s) Name: T. Obrestad;J. B. Isaksen;L. G. Moland
Attorney & Agent: lu xinhua
Abstract:
    The invention relates to a method for making NK-fertilizers basically from calcium nitrate fertilizers and potassium nitrate and homogeneous NK-fertilizer products. Calcium nitrate fertilizer is melted together with potassium nitrate to form a melt or suspension thereof which is particulated to form a homogeneous NK-fertilizer. The calcium nitrate fertilizer and the potassium nitrate are melted at 90-120 DEG C. and then heated to the desired particulation temperature being 160-190 DEG C. for prilling and 90-140 DEG C. for granulation. The components are mixed in ratios giving a melt or suspension comprising 40-14 weight % calcium nitrate, 55-85 weight % potassium nitrate, 0.5-6 weight % water, 0-4 weight % ammonium nitrate and 0-5 weight % magnesium nitrate.
Time: 4