Pelletized rice hull ash and bentonite clay insulation
OwnerJohn R. Paules, William R. Curraninventors
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Abstract
The present invention comprises rice hull ash which is pelletized subsequent to its admixture with a bentonite clay binder. A preferred product according to the present invention is pelletized rice hull ash which contains both bentonite clay and organic cornstarch binders. The bentonite clay contains approximately 58-68% SiO.sub.2, 18-21% Al.sub.2 O.sub.3, 2.5-2.8% Fe.sub.2 O.sub.3 /FeO, 2.5-3.2% MgO, 0.1-1.0% Cao, 1.5-2.7% Na.sub.2 O, 0.2-0.45% K.sub.2 O, and 4.5-9.0% free H.sub.2 O. Insulator pellets according to the present invention, when placed atop molten steel in ladles or tundishes, insulate well and do not smoke or generate unwanted dust.
Claims8
A rice hull ash pellet product comprising an absorbent pellet consisting essentially of rice hull ash and bentonite clay binder wherein said bentonite clay binder contains approximately 58-64% SiO.sub.2, 18-21% Al.sub.2 O.sub.3, 2.5-2.8% Fe.sub.2 O.sub.3 /FeO, 2.5-3.2% MgO, 0.1-1.0% CaO, 1.5-2.7% Na.sub.2 O, 0.2-0.45% K.sub.2 O, and 4.5-9.0% free H.sub.2 O, and further wherein the pelletized product contains about 87.5-96% by weight rice hull ash, about 3-8% by weight bentonite clay, up to 2% by weight cornstarch, and about 1-2.5% by weight water.
An absorbent pellet consisting essentially of rice hull ash and bentonite clay binder, wherein said bentonite clay binder contains approximately 58-64% SiO.sub.2, 18-21% Al.sub.2 O.sub.3, 2.5-2.8% Fe.sub.2 O.sub.3 /FeO, 2.5-3.2% MgO, 0.1-1.0% CaO, 1.5-2.7% Na.sub.2 O, 0.2-0.45% K.sub.2 O, and 4.5-9.0% free H.sub.2 O, and further wherein the pelletized product contains about 87.5-96% by weight rice hull ash, about 3-8% by weight bentonite clay, up to 2% by weight cornstarch, and about 1-2.5% by weight water.
A method for preparing insulator pellets comprising:
- a) admixing ingredients consisting essentially of 87.5-96% by weight rice hull ash, about 3-8% by weight bentonite clay, up to 2% by weight cornstarch and about 1-2.5% by weight water until pellets form, said bentonite clay binder containing approximately 58-64% SiO.sub.2, 18-21% Al.sub.2 O.sub.3, 2.5-2.8% Fe.sub.2 O.sub.3 /FeO, 2.5-3.2% MgO, 0.1-1.0% CaO, 1.5-2.7% Na.sub.2 O, 0.2-0.45% K.sub.2 O, and 4.5-9.0% free H.sub.2 O;
- and
- b) drying the pelletized admixture of step a) to yield a product containing a plurality of insulator pellets.
Dependencies are inferred from the claim text.