Deep cone thickener with underflow concentration rapid auto-adjustment

A deep cone thickener with an underflow concentration rapid auto-adjustment comprising a shell body, a dilution flocculation system, a shearing dewatering system, an underflow circulatory system, and an auto-control system,

• wherein the shell body comprises a thickener pool wall, a cone body, and an collection cylinder;
• the thickener pool wall is located at an exterior of the thickener, the cone body is located below the thickener pool wall, and the collection cylinder is located below the cone body;
• wherein the dilution flocculation system comprises a feed pipe, a flocculant charging pipe, and a central feed well;
• the central feed well is located at an inner upper part the thickener pool wall, the feed pipe is located at an upper part of one side of the central feed well, an end of the feed pipe penetrates through the thickener pool wall and extends to an interior of the central feed well, and the flocculant charging pipe is vertically connected to the feed pipe from an upper side of the feed pipe;
• wherein the shearing dewatering system comprises a drive motor, a drive shaft, and a rake;
• the drive motor is located at an outer upper part of the thickener pool wall, the drive shaft and the rake are located inside the thickener pool wall, and the drive motor is connected to the rake through the drive shaft;
• wherein the underflow circulatory system comprises three circulatory subsystems;
• each of the three circulatory subsystem comprises a discharging valve, an underflow pump, and a circulatory pipe;
• inlets of the underflow pumps are connected to discharging outlets of the collection cylinder, and outlets of the underflow pumps are connected to a high circulatory feedback port and a middle circulatory feedback port of the thickener pool wall and a low circulatory feedback port of the cone body through a high circulatory pipeline, a middle circulatory pipeline, and a low circulatory pipeline, respectively;
• the high circulatory feedback port, the middle circulatory feedback port, and the low circulatory feedback port are provided with discharging valves on the high circulatory pipeline, the middle circulatory pipeline;
• and the low circulatory pipeline, respectively;
• and
• wherein the auto-control system comprises a PLC control system;
• the PLC control system is connected to the underflow pumps, a concentration meter, and the discharging valves;
• two of the three circulatory subsystems of the underflow circulatory system have a same structure, a first circulatory subsystem comprises a sixth valve, a second underflow pump, a seventh valve, an eighth valve, a ninth valve, and a tenth valve, wherein the tenth valve, the ninth valve, and the eighth valve are respectively connected to the high circulatory feedback port, the middle circulatory feedback port, and the low circulatory feedback port, inlets of the tenth valve, the ninth valve, and the eighth valve are successively connected to the seventh valve, the second underflow pump;
• and the sixth valve and then to a discharging outlet of the collection cylinder;
• wherein a second circulatory subsystem has a same structure as the first circulatory subsystem;
• wherein a third circulatory subsystem comprises a first valve, a first underflow pump, the concentration meter, a second valve, a third valve, a fourth valve, a fifth valve, and an eleventh valve, wherein the fifth valve, the fourth valve, and the third valve are respectively connected to the high circulatory feedback port, the middle circulatory feedback port, and the low circulatory feedback port, inlets of the fifth valve, the fourth valve, and the third valve are connected to an outlet of the concentration meter and an inlet of the eleventh valve;
• and the concentration meter, the first underflow pump, and the first valve are successively connected to each other, then to another discharging outlet of the collection cylinder;
• and
• a mass percent concentration of the underflow in the thickener is greater than or equal to 75 wt % during a paste filling, and the mass percent concentration of the underflow in the thickener is 65 wt % in a long-distance discharge of the tailing with a high concentration.