Method to minimize viscosity and improve stability of coal-water

Details Method to minimize viscosity and improve stability of coal-water Method to minimize viscosity and improve stability of coal-water

1985-09-19

1989-03-07

Dixon, Jr., William R.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

44 66, 44 72, 44 75, 44 76, 252351, C10L 132

Patent

active

048102598

ABSTRACT:
A coal aqueous slurry having a lower viscosity and resistance to thickening with time is provided. The coal aqueous slurry includes water, particulate coal comprising carbonaceous material and water-soluble minerals, a surfactant present in the coal aqueous slurry in an amount sufficient to disperse the particulate coal in the water and a chelating agent. The included chelating agent is capable of forming a chelation complex with the metal ions formed by the water-soluble minerals dissolving into the water. The presence of the chelating, or complexing, agent reduces coagulation of the coal particles, because the chelating agent complexes soluble mineral matter and thereby prevents collapse of the protective water layer surrounding the coal particles. The low viscosity of the coal aqueous slurry is maintained as a function of time by the chelating agent since, as the mineral matter present on the surface of the coal slowly dissolves into the aqueous medium, the chelating agent present in the slurry continues to form complexes therewith. This prevents the newly dissolved mineral matter from disturbing or collapsing the coal particles' protective water layer and therefore prevents a coagulation of the particulate coal during storage of the coal aqueous slurry.

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