PRODUCTION METHOD. contact sulphuric acid plant, various kind of waste gases).

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Hector Moody
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1 "POL" PHOSPHATE FERTLZER DRY AND WASTE-FREE PRODUCTON METHOD / The elborted fertilizer prodution tehnology nd POL -phosphte fertilizer, re originl hievements dpted to present hnges in the rw-mteril nd power mrket nd tking ount of substntil griulture nd environment protetion requirements. POL fertilizer prodution tehnology. Rw mterils re rok phosphtes of ny omposition (low perentge of P25 too) s well s gses ontining sulphur trioxide (gses oming from ontt sulphuri id plnt, vrious kind of wste gses). The prodution proess is dry one. t onsists in retion of gseous sulphur trioxide with ompounds of rok phosphte milled up to grnultion s in prodution of superphosphtes. n result of the retion fluoroptite struture is destruted to phosphorus ompounds soluble in wter nd wek orgni ids. Rok phosphte is lso prtilly defluorinted. The proess tkes ple uthothermlly in one typil retor, the powdery produt leving the retor is redy for further proessing to obtin grnulr fertilizer or N-P nd N-P-K ompositions. Gses leving the retor do not ontin sulphur trioxide, nd fluorine ompounds they ontin re seprted by the method used in onventionl phosphte fertilizer plnts. Flow digrm is given in Fig. 1. #

2 - 2 - Advntges of this tehnology over energy onsuming wet tehnologies presently developed in the world re the following: - 1% of rw phosphorus is obtined in the produt - 2,5 times lower sulphur onsumption per unit of produed P lk of toxi wste e.g. phosphogypsum - no neessity to produe, store nd dilute sulphuri id - redution of wter onsumption only for produt ooling nd puri- ' fition of wste gses - pplition of typil equipment mde of inexpensive, esily vilble onstrut ion mterils - esy serviing nd mintenne of the instlltion. Bsi POL1 fertilizer prodution dt re speified herebelow: wter. onsumption m /t P

3 proess stem onsumption t/lt P reltive pitl osts per 1t P ~ O ij Considering the ft tht pitl expenditures nd prodution ost of fertilizer prodution s well s sulphur onsumption re very low nd there re no lesses of phosphorus, this tehnology is prtiulry ttrtive for investors nd importers of sulphur nd rok phosphtes. f the POL phosphte fertilizer instlltion opertes s omplex with sulphuri id plnt, gses for fertilizer prodution re tken before the sulphur trioxide bsorber s in Fig. 2. The instlltion n be ereted prllel to n existing sulphuri id plnt or ombined with new projet. The omplex, ording to requirements n produe either sulphuri id nd POL fertilizer or sulphuri id only. *

4 - 4 - POL phosphte fertilizer Composition of POL phosphte fertilizer is inluded within the nge given 1 herebelow depending on omposition of the used rok phosphte. '2'5 totl 2 - % soluble.in wter -1% '2'5 '2'5 ' soluble in itri id 15-2 % % s CO - 4 % F,s % 1-4% 2 mximum 5 % H2 free ids mximum,2 % POL fertilizer ontins three forms of phosphorus ompounds : ompounds soluble in wter, soluble in wek orgni ids, insoluble in wek orgni ids. From this point of view it is new type of phosphte fertilizer. Due to suh omposition it shows qulities of superphosphte, thermophosphtes nd milled rok phosphte. t is fertilizer ontining so-lled "phosphorus strter", however, it does not undergo retrogrdtion in the soil like superphosphte. Agriulturl exmintions of POL fertilizer rried out in Polnd on spring brley, ots, polto, mize, field pe nd on rie, soy, mize nd tpio in tropil limte proved, tht POL phosphte fertilizer rets with effiieny similr to tripple superphosphte nd in slightly idi nd - idi soil, is bsolutely better fertilizer thn superphosphte..

5 - 5 - W, \ Prtiulry good retion of the fertilizer hs been observed in tropil limte. Powder form fertilizer POL1 n be esily grnulted nd mixed without ny limittion with ny nitrogen nd potssium fertilizer to obtin N-P nd N-P-K ompositions. J,

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