Process (1) for treating fly ash containing an initial carbon concentration to obtain final ash containing a predetermined final carbon concentration, the initial carbon concentration being greater than the final concentration, the treatment process comprising: - a step ( E1) determining a proportion of carbon to be removed in order to obtain the final concentration, - a step (E2) of separating the fly ash into a plurality of fractions, one of the fractions known as the fraction to be depleted containing the proportion of carbon to be depleted. eliminate defined during step (E1), so as to obtain final ash containing the final carbon concentration, - a step (E3) of calcination of the fraction to be depleted in order to substantially eliminate the carbon concentration, this fraction being said, depleted fraction, - a step (E4) of mixing the depleted fraction with one or more fractions of fly ash. Abstract figure: Figure 1
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