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Small-scale tests of the reaction of phosphate rock with sulfuric acid resulted in the identification of conditions that yielded superphosphate of high phosphorous pentoxide availability and of such physical condition that it could be ammoniated about 1 hour after mixing. These results were verified in a pilot plant that consisted of a TV A funnel-type mixer and a continuous den. A conversion of 95% was achieved in 1 hour by slightly overacidulating finely ground rock with acid of about 60% concentration. Fresh superphosphate from the den was used immediately in the production of several grades of granular fertilizers by the TV A continuous ammoniation process. ORDINARY superphosphate, made

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