Wet granulation method for generating granules
AssigneeAirborne Industrial Minerals Inc.
InventorRobin Phinney
Life of this patent
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Abstract
A method of wet granulation of fertilizer and other materials into granules. The method involves formation of the granule directly on the pan from the feedstock without intermediate steps or the use of seed materials. The result is a product having a completely uniform cross section. The feedstock is initially in the size distribution of −150 mesh with 90% or greater in the size range of 200 mesh. Moisture is maintained to facilitate a steady process without cycling.
Claims14
A wet granulation method for granulating a feedstock into granules, comprising the steps of:
- providing a first feedstock having about 99.9% particle size of −150 mesh, of said 99.9% particle size of −150 mesh about 90% comprising a particle size of −200 mesh;
- providing a binder material having a moisture content;
- contacting said first feedstock with said binder;
- forming a pre-moistened mixture of said binder, said first feedstock and said moisture, said mixture having a moisture content of between 4% and 8% by weight;
- introducing said pre-moistened mixture onto a pan granulator containing second feedstock differently sized from said first feedstock in a size distribution of between −35 mesh and +150 mesh;
- maintaining moisture conditions on said pan where the moisture content on said pan is between 1.5% and 11% by weight;
- and
- forming first granules on said pan directly from contact of said pre-moistened mixture and said second feedstock in the absence of seed material.
A wet granulation method for granulating a feedstock into granules, comprising the steps of:
- providing a first feedstock having about 99.9% particle size of −150 mesh of said 99.9% particle size of −150 mesh about 90% comprising a particle size of −200 mesh;
- providing a binder material having a moisture content;
- contacting said first feedstock with said binder;
- forming a pre-moistened mixture of said binder, said first feedstock and said moisture, said mixture having a moisture content of between 4% and 8% by weight;
- introducing said pre-moistened mixture onto a pan granulator containing said first feedstock;
- maintaining pan moisture conditions where the moisture content on said pan is between 15% to about 11% by weight;
- forming first granules on said pan directly from contact of said pre-moistened mixture and said first feedstock in the absence of seed material;
- passing formed first granules onto a second pan granulator in the absence of said seed or nucleating material;
- and
- forming second granules in a different size distribution relative to said first granules.
Dependencies are inferred from the claim text.