Process for the separation of coal particles from fly ash by flo

Details Process for the separation of coal particles from fly ash by flo Process for the separation of coal particles from fly ash by flo

1982-02-11

1984-01-17

Nozick, Bernard

Classifying, separating, and assorting solids

Fluid suspension

Liquid

106288B, B03D 114

Patent

active

044262825

ABSTRACT:
Flotation of fly ash to recover coal contained therein is carried out in at least two steps, pH of the flotation slurry in the first step being 6-8, and in the last step lower than in the first step and below 6.5, preferably in the range of 3-5. The temperature may be ambient but is preferably 30.degree.-60.degree. C. As collector and frother several of those commonly employed are usable, preferably gas oil and pine oil, respectively. Desired pH is preferably achieved by sulphuric acid if desired in part by acidic flue gases. There is obtained separation into an almost carbon-free ash fraction and a carbonaceous fraction of low ash content.

REFERENCES:
patent: 2378552 (1945-06-01), Hoag
patent: 2724499 (1955-11-01), Smith et al.
patent: 3696923 (1972-10-01), Miller
patent: 4121945 (1978-10-01), Hurst et al.
Flotation von Flugasche aus Kraftwerken by Moiset, delivered at the Fifth Int. Coal Prep. Congress in Aachen, Section A, Paper I, 1967.
Gaudin-Flotation, 2nd Edition, McGraw Hill, New York, 1957, pp. 532-543.

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