Treatment of phosphate rock on soil in situ with sulfuric acid

Details Treatment of phosphate rock on soil in situ with sulfuric acid Treatment of phosphate rock on soil in situ with sulfuric acid

1976-09-03

1980-11-04

Therkorn, Ernest G.

Chemistry: fertilizers

Processes and products

Inorganic material

71 64SC, C05B 100

Patent

active

042317800

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.

REFERENCES:
patent: 49831 (1865-09-01), Liebig
patent: 1048454 (1912-12-01), Bash
patent: 1413048 (1922-04-01), Matheson
patent: 1849988 (1932-03-01), Moore
patent: 1869941 (1932-08-01), Oben
patent: 2504546 (1950-04-01), Wight
patent: 2680679 (1954-06-01), Harvey
patent: 3030200 (1962-04-01), Harris
patent: 3170784 (1965-02-01), Hand
patent: 3177062 (1965-04-01), Hignett
patent: 3979199 (1976-09-01), Collins et al.
Agricultural Chemicals, vol. 11, No. 2, pp. 38-40, 125-127, Feb. 1956, Sulfur-Sulfuric Acid.

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