Quick-Curing of Superphosphate

Quick Curing of Superphosphate, Effect of Ball Mill Grinding on Acidulation of Phosphate Rock

“…Decrease in the acidulation ratio below the recommended 1.8 caused a rapid drop in the conversion of the product as shown in Figure 6. This same effect was reported by Bridger and Kapusta (5).…”

“…Processes in which the curing period is reduced or eliminated entirely are referred to as quick-curing processes. Their advantages (3,5) include: product can be shipped directly from process, thus reducing bulk storage space required and working capital tied up in inventory; opportunities for producing a granular product are greater; operating conditions can be chosen with more flexibility for attaining maximum conversion; and production rates can be adjusted to meet an almost instantaneous demand because the final product can be produced in a matter of hours.…”

“…135 25 5. 1.5 24,0 94.24.06 3.24 135 21.0 1.1 19.9 94.7 2.58 3.04 93 1.80 39.1 Cold 185 20.6 0.5 20.1 97.6 4.69 1 .67 1 .1 20.7 95.2 3.28 2.54 125 21.4 0.7 20.7 96.7 3.18 1 .50 97 1.80 39.1 Cold 200 19.9 0.6 19.3 97.0 4.32 2.14 104 1.80 39.1 Cold 125 20.4 0.5 19.9 97.5 3.31 1.54 115 1 .80 39.1 45 min.…”

Quick-Curing of Superphosphate, Effect of Dryer Inlet Air Temperature, Phosphate Rock Particle Size, and Surfactants

“…sulfuric acid, and agitated for 2 minutes with the mixer blades turning at 225 r.p.m. An acid concentration of 55% was used instead of 50%, as preferred in the previous work (5), because the lower concentration did not produce as satisfactory a cake in the den in pilot plant tests. Both rock and acid were at room temperature prior to mixing.…”

Fertilizer Drying, Nitrogen Loss in Drying of Ammoniated Superphosphates and Mixed Fertilizers

“…Much further work would be necessary to include all of the commercially important fertilizer compositions. A second objective was to demonstrate that quick-cured superphosphate prepared by a process previously developed in this laboratory (3) was suitable for ammoniation and mixing W'ith other fertilizer ingredients.…”