Phosphoric Acid, Phosphates, and Phosphatic Fertilizers

Effect of Phosphate Rock Particle Size on Recovery of Uranium From Superphosphate

“…Nearly a l l of t h e f a r n i n e l a n d s of t h e United S t a t e s a r e d e f i c i e n t t o some e x t e n t i n p h o s~h o r u s c o n t e n t ( 6 ) . For t h i s reason phosphate f e r t i l i z e r s a r e a p p l i e d more o f t e n and i n g r e a t e r q u a n t i t i e s t h a n a n y o t h e r s y n t h e t i c p l a n t food (13). To supply t h e raw m a t e r i a l f o r t h e p r o d u c t i o n of t h e s e f e r t i l i z e r s l a r g e tonnages of phosphate rock a r e mined each y e a r .…”

“…I n r e c e n t y e a r s t h e United S t a t e s has mined approximately SO . m i l l i o n l o n g t o n s of phosphate rock a n n u a l l y (13).…”

Determination of Uranium and Thorium in the Industrial Phosphoric Acid Using X-Ray Fluorescence Spectrometry with Wavelength Dispersive (WDXRF)

“…The production of phosphoric acid is based on the chemical treatment of the rock phosphate with sulfuric acid, this process can be described by the following overall reaction of (Slack, 1968;Waggaman, 1969):…”

Ion-activity products of some apatite minerals

“…Most phosphate rocks would be classed as sedimentary rocks of comparatively recent geologic origin, but some are igneous and had their origin in the primeval molten magma. The name, "phosphorite," has been applied to the sedimentary deposits (Waggaman, 1952;Sauchelli, 1965).…”