The flotation level control system consists of a dedicated level measurement device, a pneumatic or electric mineral discharge adjustment mechanism, and a PLC control box. It is designed to automatically regulate the liquid level in flotation operations, ensuring process stability and improving flotation efficiency. The level measurement device includes a float and a laser distance sensor. As the float rises and falls with the slurry level, it moves a reflective plate on a guide rod. The laser sensor uses high-precision distance measurement technology to convert the liquid level into a 4-20 mA standard signal, indicating foam layer thickness (indirectly representing the flotation tank level). This signal is compared with a setpoint, outputting a control signal to adjust the gate valve position, maintaining the slurry level at the desired value.