Device, flotation machine equipped therewith, and methods for the operation thereof

The invention relates to a device for dispersing a suspension with at least one gas, comprising a dispersion nozzle, which, viewed in the flow direction of the suspension, successively comprises - a suspension nozzle tapering in the flow direction; - a mixing chamber, into which the suspension nozzle leads; - a mixing tube, which adjoins the mixing chamber and is tapered in the flow direction; and - at least one gas supply line for supplying the at least one gas into the mixing chamber, wherein the suspension nozzle comprises at least a quantity of N ≥ 3 gas channels connected to the at least one gas supply line, said gas channels leading to an end face of the suspension nozzle facing the mixing chamber. The device further comprises a number A of gas valves, where N = A applies, wherein a gas control valve is associated with each of the at least N gas channels for metering a gas volume of the gas supplied to the suspension through the respective gas channel. The invention further relates to a flotation machine comprising such a device and to methods for operating the device and flotation machine.