Pelletized rice hull ash and bentonite clay insulation

Details Pelletized rice hull ash and bentonite clay insulation Pelletized rice hull ash and bentonite clay insulation

1989-05-08

1991-12-17

Lieberman, Paul

Compositions

Electrolytes for electrical devices

106400, 106401, 106480, 501 97, 501116, 501128, F04B 174, C04B 1400, C04B 3502

Patent

active

050732811

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.

REFERENCES:
patent: 4166748 (1979-09-01), Cassens, Jr.
patent: 4295891 (1981-10-01), Daussan et al.
patent: 4440575 (1984-04-01), Daussan et al.
patent: 4571389 (1986-02-01), Goodwin et al.
patent: 4659679 (1987-04-01), Falk

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