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Class Information
Number: 71/37
Name: Chemistry: fertilizers > Processes and products > Inorganic material > Phosphorus-containing > Phosphates > Acid treatment
Description: Methods of preparing phosphatic fertilizers where the starting materials are treated with an acid or a mixture of acids.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7497891 |
Method for producing a fertilizer with micronutrients |
Mar. 3, 2009 |
| 7452398 |
Phosphate and potash(PK)-containing compound fertilizer |
Nov. 18, 2008 |
| 7175683 |
Process for transforming sludge into NPK type granulated fertilizer |
Feb. 13, 2007 |
| 7030061 |
Productive process for manufacturing an algal species-based organic complement for vegetal fertilization |
Apr. 18, 2006 |
| 6406510 |
Methods for treating wastewater sludge |
Jun. 18, 2002 |
| 6231767 |
Treatment of phosphatic wastes |
May. 15, 2001 |
| 5275639 |
Recovery of phosphates from elemental phosphorus bearing wastes |
Jan. 4, 1994 |
| 5019148 |
Homogeneous mineral granules by acid-base reaction |
May. 28, 1991 |
| 4710364 |
Continuous recovery of sulfur oxide from flue gas |
Dec. 1, 1987 |
| 4589906 |
Inorganic depot fertilizers |
May. 20, 1986 |
| 4523941 |
Process for the partial solubilization of phosphate rock and obtaining phosphate fertilizers therefrom |
Jun. 18, 1985 |
| 4515615 |
Manufacturing and using nitrogen fertilizer solutions on a farm |
May. 7, 1985 |
| 4512794 |
Manufacturing and using nitrogen fertilizer solutions on a farm |
Apr. 23, 1985 |
| 4511389 |
Manufacturing and using nitrogen fertilizer solutions on a farm |
Apr. 16, 1985 |
| 4486217 |
Compound solid fertilizer and manufacturing method thereof |
Dec. 4, 1984 |
| 4478633 |
Method for processing wastes resulting from production of phosphorus, namely, slime and off-gasses, with utilization of the resultant products |
Oct. 23, 1984 |
| 4469504 |
Process for the partial solubilization of phosphate rock and obtaining acid and phosphate fertilizers therefrom |
Sep. 4, 1984 |
| 4462972 |
Method for producing fertilizer-grade phosphoric acid |
Jul. 31, 1984 |
| 4440560 |
Mixed phosphatic fertilizer and process for producing the same |
Apr. 3, 1984 |
| 4405575 |
Method of defluorinating phosphates |
Sep. 20, 1983 |
| 4393030 |
Upgrading of phosphate ore |
Jul. 12, 1983 |
| 4252553 |
Process for production of fertilizers |
Feb. 24, 1981 |
| 4168150 |
Process for production of fertilizers |
Sep. 18, 1979 |
| T986001 |
Production of suspension fertilizers from orthophosphoric acid |
Sep. 4, 1979 |
| T986002 |
Granulation of fertilizer borate |
Sep. 4, 1979 |
| 4137063 |
Production of potassium polyphosphates from potassium silicofluorides |
Jan. 30, 1979 |
| 4134750 |
Granular ammonium phosphate sulfate and urea-ammonium phosphate sulfate using a common pipe-cross reactor |
Jan. 16, 1979 |
| T969002 |
Granular ammonium phosphate sulfate and urea-ammonium phosphate sulfate using a common pipe-cross reactor |
Apr. 4, 1978 |
| 4073635 |
Process for producing a slurry suitable for the manufacture of a mixed fertilizer containing nitrogen plus phosphorus |
Feb. 14, 1978 |
| 4073634 |
Process for production of fertilizers |
Feb. 14, 1978 |
| 4028087 |
Fertilizer processes incorporating scrubbed flue gas sludge byproduct |
Jun. 7, 1977 |
| 3966450 |
Animal waste odor treatment |
Jun. 29, 1976 |
| 3962329 |
Manufacture of granular isobutylidenediurea |
Jun. 8, 1976 |
| 3947262 |
Method of producing phosphorus-containing fertilizers |
Mar. 30, 1976 |
| 3932166 |
Landfill and soil conditioner |
Jan. 13, 1976 |
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