Method for the processing of fly ash, scrubber sludge and the li

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium

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423122, 423127, 423128, 423129, 423131, 106DIG1, B01F 100

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active

050193600

ABSTRACT:
A method for the processing of fly ash scrubber sludge or the like is provided. The method yields unique products, including a usable calcium silicate material and a high purity alumina material. The process involves a plurality of stages including a first magnetic separation in an acid leach. During the acid leach, valuable mineral components are converted into soluble sulfates. The leach residue, containing calcium materials, is extracted with ammonia solution to yield a desirable calcium silicate product. The leach liquor is treated in a preferred manner to precipitate relatively acid free aluminum sulfate. The aluminum sulfate is then converted into a desirable alumina product.

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Sulfuric Acid and Cement from Anhydrite, by John Manning, B. Sc., PhD., F.R.I.C.
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Translation of Melkonian et al., "A Method for Producing Clay Earth and Byproducts".
Translation of Kuettner et al., "A Method for Preparation of White, Finely-Divided Calcium Silicate".

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