摘要 |
<p>The method according to the invention consists in that the reaction of phosphoric raw material decomposition is carried out using a reactant solution containing from 1.5 to 4.0 mol of urea per 1 mol of sulphuric acid, in a quantity corresponding to 90 to 100% of acid in respect of the stoichiometric requirement for the complete decomposition of the rock phosphate, whereas into the reaction environment water is added in an amount necessary to ensure its content in process pulp in the range of 16-25% in respect of the whole mass of the suspension, and the process pulp obtained is fed directly to a granulation unit. The plant according to the present invention comprises an agitated reactor (1) to manufacture reactant solution, a system of two reactors (3 a i 3b) prepared for continuous operation, a set of granulators (5), a rotary dryer operating on hot air or flue gas (6), a set of sieves (7) and a recycle system comprising a grinding mill (13) and a buffer tank (14). The method and the plant according to the invention are particularly suited for the manufacture of USP fertiliser in a continuous process and allow for avoiding time- and cost-intensive operations related to product aging.</p> |
申请人 |
INSTYTUT NAWOZÓW SZTUCZNYCH;GRUPA AZOTY ZAKLADY AZOTOWE "PULAWY" SPÓLKA AKCYJNA |
发明人 |
BISKUPSKI, ANDRZEJ;MIECZYSLAW, BOROWIK;DAWIDOWICZ, MICHAL;IGRAS, JANUSZ;KOWALSKI, ZYGMUNT;KRUK, JANUSZ;MALINOWSKI, PRZEMYSLAW;MOZENSKI, CEZARY;MYKA, AGNIESZKA;RUSEK, PIOTR;SAS, JÓZEF;SCHAB, SEBASTIAN;ZDEB, ZDZISLAW;ZDUNEK, ANNA;BIELSKI, PAWEL;BOLESLAWSKA, AGNIESZKA;SCHIMMELPFENNIG, LECH;ZATORSKI, MAREK;WIELICKA, JOLANTA |