Controlled release fertilizers containing calcium sulfate and processes for making same
First Claim
Patent Images
1. An extended release fertilizer comprising:
- particles of an absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter which is impregnated in an amount of 40-95% of the capillaries/voids volume with an agriculturally beneficial material, at least including calcium sulfate and said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides, and said particles of absorbent material being agglomerated into granules.
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Abstract
An extended release fertilizer that includes an absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter which is impregnated in an amount of 40-95% of the capillaries/voids volume with an agriculturally beneficial material, or alternatively includes a holding agent retaining an agriculturally beneficial material, wherein the beneficial material at least includes calcium sulfate, and the beneficial material is selected from the group consisting of fertilizers, insecticides, herbicides and fungicides, with the resulting material being agglomerated into granules.
45 Citations
89 Claims
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1. An extended release fertilizer comprising:
particles of an absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter which is impregnated in an amount of 40-95% of the capillaries/voids volume with an agriculturally beneficial material, at least including calcium sulfate and said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides, and said particles of absorbent material being agglomerated into granules.
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2-13. -13. (canceled)
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14. A controlled release agricultural product comprising:
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a mixture of a control release holding substance selected from the group consisting of plant starches, protein gels, glues, gumming compositions, crystallizing compounds, gelling clays and synthetic gel forming compounds; and an agriculturally beneficial, at least including calcium sulfate, said agriculturally beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides, said agricultural product being in a particulate form, agglomerated into granules. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An extended release fertilizer comprising:
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particles of an absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter which is impregnated in an amount of 40-95% of the capillaries/voids volume with an agriculturally beneficial material, said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides; and said particles of absorbent material being agglomerated with particles of calcium sulfate into granules.
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39-50. -50. (canceled)
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51. A controlled release agricultural absorbent based product comprising:
particles of exfoliated perlite as an absorbent material, containing capillaries/voids between 10-200 microns in cross-sectional diameter, which is impregnated in an amount of 40-95% of the capillaries/voids volume with a mixture of an interspatial blocker and an agriculturally beneficial material, at least including calcium sulfate, said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides and said particles of absorbent material being agglomerated into granules.
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52. A controlled release agricultural product comprising urea and calcium sulfate dihydrate in granular form.
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53-55. -55. (canceled)
- 56. A controlled release agricultural product comprising ammonium sulfate and calcium sulfate dihydrate in granular form.
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58-59. -59. (canceled)
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60. A controlled release agricultural product comprising urea, ammonium sulfate and calcium sulfate dihydrate in granular form.
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61-63. -63. (canceled)
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64. A process for preparing a controlled release agricultural absorbent based product comprising the following steps:
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introducing a predetermined amount of water to particles of absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter, to result in absorption of water within the absorbent material; heating the absorbent particles and water to transform the water within the absorbent particles to steam; introducing the heated absorbent particles to an agriculturally beneficial material, at least including calcium sulfate, and said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides for blending to essentially saturate the absorbent particles with the agriculturally beneficial material; and granulating the combination of agriculturally beneficial material and saturated absorbent particles to solidify and harden the mixture within the absorbent particles and outside the particles, resulting in the agglomeration of absorbent particles into granules.
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65-68. -68. (canceled)
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69. A process for preparing a controlled release agricultural absorbent based product comprising the following steps:
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introducing a predetermined amount of water to particles of absorbent material containing capillaries/voids between 10-200 microns in cross-sectional diameter, to result in absorption of water within the absorbent material; heating the absorbent particles and water to transform the water within the absorbent particles to steam; mixing an interspatial blocker material and an agriculturally beneficial material, at least including calcium sulfate, and said beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides; introducing the heated absorbent particles to the mixture of agriculturally beneficial material and interspatial blocker for blending to essentially saturate the absorbent particles with the mixture of agriculturally beneficial material and interspatial blocker; and granulating the combination of agriculturally beneficial material, interspatial blocker and saturated absorbent particles to solidify and harden the mixture within the absorbent particles and outside the particles, resulting in the agglomeration of absorbent particles into granules.
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70-72. -72. (canceled)
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73. A process for preparing a controlled release agricultural product comprising the following steps:
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mixing a control release holding substance selected from the group consisting of plant starches, protein gels, glues, gumming compositions, crystallizing compounds, gelling clays and synthetic gel forming compounds with an agriculturally beneficial material in an aqueous solution or molten state, at least including calcium sulfate, said agriculturally beneficial material being selected from the group consisting of fertilizers, insecticides, herbicides and fungicides; blending the mixture of agriculturally beneficial material and holding substance; and granulating the combination of agriculturally beneficial material and holding substance to solidify and harden the mixture, resulting in granules.
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74-87. -87. (canceled)
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88. A process for preparing a controlled release agricultural product comprising the following steps:
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mixing solutions or melts of an agriculturally beneficial material with calcium sulfate; and cooling and granulating the resulting mixture to a granular solid, wherein the calcium sulfate is dispersed within the granular solid, being inter-crystallized within the solid.
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89. (canceled)
Specification