Treatment of phosphate rock on soil in situ with sulfuric acid
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United States of America Patent
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Nov 4, 1980
Grant Date -
N/A
app pub date -
Sep 3, 1976
filing date -
Sep 3, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A layer of bare, untreated phosphate rock granules is applied to the soil, and concentrated sulfuric acid is supplied thereto. The sulfuric acid is sufficiently concentrated so as to be containable by cold-rolled carbon steel, and sufficiently viscous to cling to the granules to react therewith. Sulfuric acid in excess of the amount needed for reaction with the phosphate rock can be added to correct alkaline conditions in the underlying soil. The reaction of sulfuric acid with the phosphate rock produces substantial quantities of available phosphate and gypsum.
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