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Class Information
Number: 71/42
Name: Chemistry: fertilizers > Processes and products > Inorganic material > Phosphorus-containing > Phosphates > Alkaline treatment
Description: Methods of preparing phosphate containing fertilizers wherein the starting materials are treated with a distinctly alkaline substance such as the alkali metal oxides, hydroxides and carbonates or the alkaline earth metal oxides or hydroxides.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7175683 |
Process for transforming sludge into NPK type granulated fertilizer |
Feb. 13, 2007 |
| 7135116 |
Process for recovery of nutrients from wastewater |
Nov. 14, 2006 |
| 6830696 |
Treatment of spent pulping liquor with lignin separation to recover alkali pulping chemicals in manufacture of paper pulp |
Dec. 14, 2004 |
| 6569342 |
Process for treating waters, soils, sediments and/or silts |
May. 27, 2003 |
| 6506805 |
Magnesium ammonium phosphate hexahydrate and monohydrate slurries |
Jan. 14, 2003 |
| 6476082 |
Magnesium ammonium phosphate hexahydrate slurry |
Nov. 5, 2002 |
| 5192428 |
Portable system for treating human waste |
Mar. 9, 1993 |
| 5028252 |
Method of and composition for the fertilization, detoxification and deacidification of soil |
Jul. 2, 1991 |
| 5019148 |
Homogeneous mineral granules by acid-base reaction |
May. 28, 1991 |
| 4792349 |
Fertilizer values from galvanizer waste |
Dec. 20, 1988 |
| 4650682 |
Acidifier-ammoniator |
Mar. 17, 1987 |
| 4427432 |
Clarification of black ammonium polyphosphate liquids--recycling of byproduct "tops" |
Jan. 24, 1984 |
| 4331465 |
Process for the production of NPK fertilizers resistant to smoldering decomposition at elevated temperatures |
May. 25, 1982 |
| 4279635 |
Process for treating phosphatic clay suspensions |
Jul. 21, 1981 |
| 4248617 |
Process for producing granular basic phosphate fertilizer |
Feb. 3, 1981 |
| 4106922 |
Alkaline decomposition process for producing calcined phosphate fertilizer |
Aug. 15, 1978 |
| 3932166 |
Landfill and soil conditioner |
Jan. 13, 1976 |
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