Fly ash collection

Details Fly ash collection Fly ash collection

1979-12-26

1981-03-17

Thomas, Earl C.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 25, 423 53, 423 62, 423 69, 423 87, 423 99, 423100, 423111, 423113, 423138, 423155, 423156, 4232155, 423244, 423508, 44 5, 55 5, 110344, 110345, C01G 102, B01D 4500

Patent

active

042567033

ABSTRACT:
To a coal-fired furnace that uses electrostatic precipitation or a mechanical collector to collect fly ash, a mix of magnesia-alumina or magnesia-talc is added above the fireball (2600.degree.-3300.degree. F.). The additive increases the mean particle size of the fly ash and reduces its surface resistivity, thereby causing improved collection in the electrostatic precipitators or mechanical collector. Fine particulates containing heavy metals tend to be agglomerated; thus the invention permits recovery of substantial amounts of heavy metal contaminants that would otherwise be lost as stack emission.

REFERENCES:
patent: 3249075 (1966-05-01), Nelson et al.
patent: 3547583 (1970-12-01), Wilson
patent: 3579293 (1971-05-01), Schulz et al.
patent: 3665676 (1972-05-01), McKewen
patent: 3689213 (1972-09-01), Guerrieri
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patent: 3837820 (1974-07-01), Kukin et al.
patent: 3851042 (1974-11-01), Minnick
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patent: 4042348 (1977-08-01), Bennett et al.
patent: 4058587 (1977-11-01), Nelson
patent: 4062926 (1977-12-01), Knight
patent: 4070162 (1978-01-01), Kober et al.
patent: 4115518 (1978-09-01), Delman et al.
Radway, "Effectiveness of Fireside Additives in Coal-Fired Boilers", Power Engineering, Apr. 1978, pp. 72-86.

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