The invention relates to a process for manufacturing a hydraulic binder comprising a calcium aluminate, according to which: a) a composition comprising a lime source compound C and an alumina source compound is provided, said composition comprising at most 95% of lime C and alumina, and at least 23% of alumina, by mass relative to the total mass of dry matter of the composition; b) the composition provided in step a) is placed in a medium saturated with humidity, at a hydration temperature of between 40 ° C. and 150 ° C., so as to precipitate hydrated phases comprising at least one oxide d aluminum combined with calcium oxide and water; c) placing the precipitates obtained in step b) at a baking temperature between 200 ° C and 1300 ° C, for at least 15 minutes.
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