Process to recover alkali from a metal oxide/hydroxide containing material
AssigneeFPInnovations
InventorsTalat Mahmood, Naceur Jemaa
Life of this patent
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Abstract
A process for recovering alkali from power boiler ash is provided. The power boiler ash is first contacted with Na2CO3 to produce a mixture containing settling and non-settling solid particles. A fraction of the settling particles is then separated from the mixture to produce a first clarified alkaline solution. The first clarified alkaline solution contains species such as NaOH and KOH depending upon the power boiler ash characteristics. The non-settling solid particles may optionally be further separated from the first clarified alkaline solution to obtain a second clarified alkaline solution. This process is also applicable for the extraction of alkali from other oxide/hydroxide containing materials.
Claims9
A process for recovering alkali from power boiling ash materials comprising the steps of:
- contacting the power boiling ash materials containing a mixture of metal oxides and hydroxides with a Na COs solution to obtain a slurry at a temperature of from 20 to 100° C., wherein the slurry comprises settling solid particles, non-settling solid particles and alkali generated during the contacting step, and wherein the power boiling ash materials are ash, bottom ash or combined ash;
- and
- separating a fraction of the solid particles from the slurry to obtain a clarified alkaline solution,
- wherein the temperature of from 20 to 100° C. is maintained throughout the contacting step and the separating step.
Dependencies are inferred from the claim text.