Recovery process and apparatus for alkali metal-containing waste

Details Recovery process and apparatus for alkali metal-containing waste Recovery process and apparatus for alkali metal-containing waste

1976-03-03

1977-07-12

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

23262, 162 36, 162240, 210 46, 423182, 423207, D21C 1102, D21C 1112

Patent

active

040352285

ABSTRACT:
A process and apparatus for treating concentrated alkali metal-containing waste liquor to recover the alkali metal content for reuse includes the following steps and apparatus. Concentrated alkali metal-containing waste liquor is mixed with recycled alumina and formed into solid pellets by mixing the concentrated liquor-alumina mixture with recycled alkali metal aluminate furnace ash. The solid pellets are fed through a furnace operating at a temperature below the fusion temperature of the aluminate for combusting the organic portion of the pellets and reacting the alkali metal content thereof with the alumina to form additional alkali metal aluminate ash. A portion of the furnace ash is recycled for reuse in the formation of pellets, while another portion of the ash is dissolved in water to form a solution of alkali metal aluminate. The alkali metal aluminate solution is mixed with slurry recycled from later in the process to initiate limited precipitation of alumina from the alkali metal aluminate. The mixture is then reacted with acidic oxide gas to effect additional precipitation of alumina and produce a slurry of the alumina in a solution containing the alkali metal. The alumina is separated for reuse in the treating process and the alkali metal-containing solution is recovered.

REFERENCES:
patent: 2141132 (1938-12-01), Folger
patent: 2356626 (1944-08-01), Seailles
patent: 2574008 (1951-11-01), Beja
patent: 3652208 (1972-03-01), Burk et al.
patent: 3787283 (1974-01-01), Sheeley et al.

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