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RESEARCH AND DEVELOPMENT IN THE FERTILIZER INDUSTRY
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acidulate advantage ammonia plant ammonium nitrate ammonium phosphate ammonium polyphosphate ammonium sulfate amount application bulk blending calcium nitrate carbamate carbon dioxide catalyst Chemical claimed coating commercial compounds concentration containing converter cooling corrosion cost crystals decomposition diammonium dihydrate drum economics effect evaporator filter Fisons fluorine Food Chem furnace give granular granulation gypsum heat hemihydrate higher impurities increase industry Khim liquid fertilizer major material melt method micronutrient mixture moisture monoammonium phosphate neutralization nitric acid nitric phosphate nutrient operation oxide particles patented phosphate rock phosphoric acid pilot plant potash potassium chloride potassium nitrate precipitate pressure prilling problem ratio reaction reactor recycle reduced reformer relatively removed reported salt Sittig slow-release slurry soil solid steam studied sulfuric acid superphosphoric acid suspension synthesis gas temperature tests triple superphosphate United urea water solubility wet-process acid zinc