Device and method for extracting metal from a rare earth electrolytic cell

Abstract

The invention relates to a rare earth electrolysis cell tapping device and method. The rare earth electrolysis cell tapping device comprises a metal scoop, a scoop handle, a multi-freedom-degree mechanical arm and a control system. The multi-freedom-degree mechanical arm comprises a longitudinal movement mechanism, a turning-over mechanism, a transverse moving mechanism and a rotating mechanism. The control system is electrically connected with the multi-freedom-degree mechanical arm and used for controlling the multi-freedom-degree mechanical arm to move so as to enable the metal scoop to complete the scooping-out motion. The method for achieving tapping through the device comprises the steps that the multi-freedom-degree mechanical arm moves to the position over an electrolysis cell, descends to a molten salt electrolyte layer to be preheated, descends to a rare earth metal layer, and ascends to scoop out metal and cast ingots. The device and method have the advantages of being free of electrolyzing temperature influence, small in weight and high in efficiency. Through a second longitudinal moving mechanism fixed to a first lifting rod and a size block inserted into the metal scoop, oxidation of the surface of rare earth metal can be effectively prevented, and the surface quality of the rare earth metal is endured.

Description

technical field [0001] The patent of the invention relates to a device and method for extracting metal from a rare earth electrolytic cell, belonging to the field of rare earth metallurgy. Background technique [0002] The preparation of rare earth metals and alloys by oxide electrolysis technology has been developed in China for decades, and the electrolytic oxide technology of fluoride system is also becoming more and more mature on the basis of continuous innovation, and has become the main process for the production of rare earth metals in my country. The research on electrolytic cells has made great progress. At present, there are 4000-7000A electrolytic cells and 10KA electrolytic cells. Very few large-scale enterprises have researched and developed large-scale electrolytic cells above 10KA, but the metal output method is still in the manual operation stage. The efficiency of the method is low, the labor intensity of the workers is high, and the quality of the product ...

AI Technical Summary

Problems solved by technology

[0005] 2. Low flexibility, bulky device, siphon type automatic metal discharge device, complete rare earth metal casting in a closed casting room, when the rare earth metal in the electrolytic cell is finished, the rare earth metal stays in the casting room to cool down to 30-50 Take it out after ℃, when moving the siphon device, it is necessary to remove the device and the rare earth metal in the casting chamber together, it is very laborious to move

However, during the normal metal discharge time, when the siphon device rises, a small amount of molten salt is also sucked out, and the liquid level of the molten salt in the electrolytic tank is also lowered. At the same time, the temperature in the electrolytic tank fluctuates greatly; Molten salt in the tank, resulting in the shutdown of the electrolyzer

[0007] 4. The siphon metal discharge device must ensure that the vacuum pressure in the casting chamber is within a certain range during the metal discharge process. If the pressure is too low, the metal in the electrolytic tank cannot be sucked out, and the titanium tube is easy to block; if the pressure is too high, the metal suction speed is too fast. , the metal impact casting indoor ingot mold, the metal forming is not good, the surface is easy to be mixed, and the molten salt is also sucked out, the molten salt in the electrolytic cell is easy to dry up, affecting the normal electrolysis of the electrolytic cell or stopping production

[0008] 5. During the electrolysis process, the metal is produced 4 times in 12 hours, and the siphon automatic metal discharge device is continuously used to discharge the metal within 12 hours. The temperature of the molten salt in the electrolytic tank will drop, resulting in the incomplete electrolysis of the added rare earth oxides, and the rare earth metals that come out The carbon content is high, and the qualified rate of the product drops significantly. After 2-3 days of manual adjustment, the electrolytic cell can be electrolyzed normally.

Images