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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
8216337 Process for the manufacture of bio-release fertilizers of zinc-iron-manganese, iron-manganese-copper and zinc-iron manganese-copper Jul. 10, 2012
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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