Suspension fertilizers and method of producing same
AssigneeN L Industries, Inc.
InventorLonnie Daniel Hoover
Life of this patent
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Abstract
Suspension fertilizers containing humic acid as a crystallization inhibitor and crystal growth modifier. Suspension fertilizers containing from 0.05% to 3% humic acid and from 0.25%-3% bentonite have excellent stability as evidenced by a low concentration of crystals, a low crystal growth rate, good suspension characteristics and good rheological properties. An improved method of manufacturing suspension fertilizers which consists of adding from 0.05% to 3% by weight humic acid to the suspension fertilizer, and a method of inhibiting the formation and growth of crystals from a supersaturated solution of at least one fertilizer chemical which comprises adding from 0.05% to 3% by weight humic acid to the solution before it becomes supersaturated.
Claims36
In a method for producing a suspension fertilizer which includes saturating an aqueous phase with at least one phosphate containing fertilizer chemical and thereafter causing said saturated aqueous phase to become supersaturated from which phosphate crystals may be formed, the improvement which comprises adding before said aqueous phase becomes supersaturated between about 0.05% and about 3% by weight, based on the total weight of said suspension fertilizer of an alkali metal or ammonium salt, or mixtures thereof, of humic acid or a material which contains humic acid selected from the group consisting of leonardite, lignite, marine sediments, and mixtures thereof.
In a method for producing a suspension fertilizer containing from 0.25% to about 3% by weight bentonite which includes reacting ammoniating fluid and phosphoric acid at a first temperature substantially above 50.degree. C, and controlling the water content of said ammoniating fluid and phosphoric acid to effect a supersaturated solution while cooling the resulting liquid, the improvement which comprises adding to said solution before cooling between about 0.05% and about 3% by weight humic acid, based on the total weight of said suspension fertilizer.
A method of inhibiting the formation and growth of phosphate crystals from a supersaturated solution of a fertilizer chemical containing at least nitrogen, and phosphorous which comprises adding to said solution from 0.05% to 3% by weight of an alkali metal or ammonium salt of humic acid or a material which contains humic acid selected from the group consisting of leonardite, lignite, marine sediments, and mixtures thereof, before said solution becomes supersaturated.
The method of inhibiting the formation and growth of crystals from a supersaturated solution of at least one fertilizer chemical and of preventing the settling of any crystals which are formed from said solution, which comprises adding to said solution from 0.05% to 3% by weight of an alkali metal or ammonium salt, or mixtures thereof, of humic acid or a material which contains humic acid selected from the group consisting of leonardite, lignite, marine sediments, and mixtures thereof, before said solution becomes supersaturated and from 0.25% to 3% by weight bentonite.
A high analysis suspension-type fertilizer having plant-food content and desirable flow properties which comprises:
- i. water;
- ii. a nitrogen-containing compound to provide at least 10% nitrogen by weight;
- iii. a phosphorous containing compound to provide at least 35% by weight P.sub.2 O.sub.5 ;
- and
- iv. 0.05% to 3% by weight of a material selected from the group consisting of humic acid, leonardite, lignite, marine sediments, and the alkali metal and ammonium salts thereof;
- wherein said concentrations are based on the total weight of said suspension fertilizer.
A high analysis suspension-type fertilizer having plant-food content and desirable flow properties, which comprises:
- i. water;
- ii. a nitrogen containing compound to provide at least 8% nitrogen by weight;
- iii. a phosphorous containing compound to provide at least 12% by weight P.sub.2 O.sub.5 ;
- iv. a potassium compound to provide at least 7% by weight K.sub.2 O;
- and
- v. 0.05% to 3% by weight of a material selected from the group consisting of humic acid, leonardite, lignite, marine sediments, and the alkali metal and ammonium salts thereof;
- wherein said concentrations are based on the total weight of said suspension fertilizer.
A process for producing stable suspension fertilizers, which comprises:
- reacting in sufficient amounts a mixture of an ammoniating fluid and wet-process phosphoric acid until the resulting suspension contains at least 10% nitrogen by weight, and at least 35% phosphorous expressed as P.sub.2 O.sub.5 ;
- adding to said reaction mixture before it becomes supersaturated from 0.25% to 3% by weight bentonite and 0.05% to 3.0% by weight, based on the total weight of said suspension, of an alkali metal or ammonium salt, or mixture thereof, of humic acid or a material which contains humic acid selected from the group consisting of leonardite, lignite, marine sediments, and mixtures thereof, said bentonite and said salt being dispersed in water before addition to said reaction mixture;
- and
- adding to said reaction mixture containing bentonite and said salt a sufficient amount of a material selected from a nitrogen-containing compound, and a potassium-containing compound to prepare a suspension fertilizer containing at least 8% nitrogen and at least 12% phosphorous expressed as P.sub.2 O.sub.5.
Dependencies are inferred from the claim text.