Mixer for sucking and mixing a solid product, of a powdery type, with a liquid coming from a vat, the mixer comprising: - a suction lance having a suction tip adapted to suck said powdery product and a discharge tip for discharging said product, - a mixing basin defining a shape of revolution delimited by a lateral wall, about a vertical axis of revolution, the basin extending axially from an upper portion delimited by a ceiling down to a lower portion, the discharge tip of the suction lance opens into the upper portion of the basin to inject the product into the basin, - a hydraulic circuit designed to circulate the liquid between the vat and the basin, said circuit including at least one injection conduit having at least one injection nozzle that opens into the upper portion of the basin such that the liquid from the vat flows on the lateral wall of the basin, and a discharge conduit that is adapted to link the lower portion of the basin on the vat, and - a liquid suction device which is arranged downstream of the basin, for sucking the liquid and the product mixed together through the discharge conduit linked on the mixing basin, characterized in that: - the suction lance is detachably mounted on the basin, the mixer including a coupling device for quick coupling by form-fitting of the discharge tip of the suction lance on the ceiling of the basin, - the discharge tip of the suction lance opens axially into the ceiling of the basin so as to inject the product in the basin, the discharge tip projecting with respect to the ceiling of the basin so as to form a lip inhibiting the entry of liquid inside the suction lance, when the suction lance is mounted on the basin. - a suction lance having a suction tip adapted to suck said powdery product and a discharge tip for discharging said product, - a mixing basin defining a shape of revolution delimited by a lateral wall, about a vertical axis of revolution, the basin extending axially from an upper portion delimited by a ceiling down to a lower portion, the discharge tip of the suction lance opens into the upper portion of the basin to inject the product into the basin, - a hydraulic circuit designed to circulate the liquid between the vat and the basin, said circuit including at least one injection conduit having at least one injection nozzle that opens into the upper portion of the basin such that the liquid from the vat flows on the lateral wall of the basin, and a discharge conduit that is adapted to link the lower portion of the basin on the vat, and - a liquid suction device which is arranged downstream of the basin, for sucking the liquid and the product mixed together through the discharge conduit linked on the mixing basin, - the suction lance is detachably mounted on the basin, the mixer including a coupling device for quick coupling by form-fitting of the discharge tip of the suction lance on the ceiling of the basin, - the discharge tip of the suction lance opens axially into the ceiling of the basin so as to inject the product in the basin, the discharge tip projecting with respect to the ceiling of the basin so as to form a lip inhibiting the entry of liquid inside the suction lance, when the suction lance is mounted on the basin.