Enhancement of binding characteristics for production of an agglomerated product
View Patent ↗A method is provided for preparing a product from a precursor material. The method includes the steps of (a) mixing a particulate material and a binder to form a precursor material and (b) irradiating that precursor material with microwave radiation so as to activate the binder and form the product.
1. A method of preparing a product from a precursor material, comprising:
mixing a particulate material with polyvinyl alcohol (PVA) and a binder comprising an unmodified starch to form a precursor material, wherein the binder is added at a ratio of at least 2:1 to PVA;
irradiating said precursor material with microwave radiation and bringing said precursor material to a temperature of between 100-160° C. during irradiation to activate said precursor material and form an agglomerated product.
2. The method of claim 1 , including selecting said particulate material from the group consisting of wood, paper, plastic, coal fines, biomass, 0-10 weight percent moisture bituminous coal fines, 10-30 weight percent moisture bituminous coal fines, sub-bituminous coal fines, lignite, anthracite coal fines, wheat straw, corn stover, switch grass, miscanthus, hemp, willow, sorghum, sugar cane, bamboo, poplar, oak, wood chips, saw dust, wood laminates, municipal solid waste, yard clippings, leaves and mixtures thereof.
3. The method of claim 1 , including providing said precursor material with a moisture content of between 0-45 weight percent prior to activating by microwave radiation.
4. The method of claim 1 , including providing said precursor material with a moisture content of between 15-35 weight percent prior to activating by microwave radiation.
5. The method of claim 1 , including providing said precursor material with a moisture content of between 5-25 weight percent prior to activating by microwave radiation.
6. The method of claim 1 , including bringing said precursor material to a temperature of between 100-125° C. during irradiating to activate said binder and form an agglomerated product.
7. The method of claim 2 , comprising adding glycerol in combination with a second binder material selected from the group consisting of maleic anhydride, phthalic anhydride, other anhydrides and mixtures thereof wherein said weight ratio of glycerol to second binder material is between 2 to 1 and 1 to 2.
8. The method of claim 1 , further comprising adding a second binder material selected from a group consisting of starch, corn starch, wheat starch, unmodified corn starch, unmodified wheat starch, pregelatinized corn starch, pregelatinized wheat starch and mixtures thereof wherein said weight ratio of polyvinyl alcohol to second binder material is between 1 to 0.1 and 1 to 10.
9. The method of claim 1 , wherein said product is a fuel product and said mixing step includes mixing between 0-99.5 weight percent coal fines, 0-99.5 weight percent biomass and 0.5-10.0 weight percent binder.
10. The method of claim 8 , wherein said weight ratio of polyvinyl alcohol to second binder material is between 1 to 1 and 1 to 4.
11. The method of claim 1 , further comprising adding a second binder material selected from a group consisting of maleic anhydride, phthalic anhydride, other anhydrides and mixtures thereof wherein said weight ratio of glycerol to second binder material is between 2 to 1 and 1 to 2.
12. The method of claim 1 further including forming said fuel product into a briquette.
13. The method of claim 1 , further including extruding said fuel product into an extrudate.
14. The method of claim 1 , including forming said fuel product into a puck.
15. The method of claim 1 , including forming said fuel product into a spherically-shaped pellet.
16. The method of claim 1 , including compressing said fuel product into an agglomerated mass.