Oxidative coal desulfurization using lime to regenerate alkali m

Details Oxidative coal desulfurization using lime to regenerate alkali m Oxidative coal desulfurization using lime to regenerate alkali m

1979-01-02

1980-07-22

Dees, Carl F.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

201 17, C10L 910, C10B 5700

Patent

active

042137659

ABSTRACT:
A process for the removal of pyrite from coal which comprises preparing an aqueous slurry containing finely-divided coal particles; adding to the slurry an alkali metal hydroxide selected from the group consisting of sodium hydroxide, potassium hydroxide and lithium hydroxide, as well as mixtures thereof, in amounts sufficient to continuously maintain the pH of the slurry at a value of below about 8; agitating the slurry while treating the slurry with oxygen or an oxygen-containing gas to convert the pyrite in the coal to a soluble alkali metal sulfate; reacting lime with the so-formed alkali metal sulfate to regenerate the alkali metal hydroxide and then recycling the hydroxide for use in the process.

REFERENCES:
patent: 3960513 (1976-06-01), Agarwal et al.
patent: 4054420 (1977-11-01), Loganbach
patent: 4055400 (1977-10-01), Stambaugh et al.

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