Process for increasing the specific gravity of red mud solids

Details Process for increasing the specific gravity of red mud solids Process for increasing the specific gravity of red mud solids

1989-12-07

1991-09-24

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423119, 252 8512, 252 8516, B01D 1100

Patent

active

050512439

ABSTRACT:
This invention provides an improved process for increasing the specific gravity of red mud. The process comprises mixing red mud in an acidic solution, such as sulfur dioxide solution, having a pH of between about 1.5 and about 3.0 to form an insoluble red mud residue. The specific gravity of the red mud residue can also be increased by heating the residue in air to a temperature of 250.degree. C. to about 300.degree. C. This process enables recovery of a treated red mud derivative having an increased specific gravity in excess of 4.0, which makes the product particularly useful as a weighting agent for drilling fluid, and as the solid phase of slurries used to fill crevices and fissures exposed by drilling or excavation.

REFERENCES:
patent: 4810682 (1989-03-01), Andrews

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