Method for increasing discharging uniformity of aluminum oxide of aluminum cell

Abstract

The invention provides a method for increasing the discharging uniformity of aluminum oxide of an aluminum cell and relates to the improvement of adischargingmethod of a pre-baked aluminum cell. The method is characterized in that a guide pipe is arranged at a discharging port of an aluminum oxide constant volume blanker in a discharging process; a plurality of branchdischarging pipes are arranged at the lower end of the guide pipe; horn-shaped dischargingfunnels are connected with the lower ends of the branch discharging pipes; and aluminum oxide passes through the guide pipe, the discharging pipes and the dischargingfunnels and then enters electrolyte. According to the method provided by the invention, the discharging uniformity of aluminum oxide of the aluminum cell is increased by increasing the number ofdischarging points, reducing the one-timedischargingvolume of thedischarging points and increasing the dischargingand dispersion area of the aluminum oxide according to the approaching feeding principle. Compared with the present pre-baked cell shell-striking dischargingmethod, the method has the advantages that no shell-striking hammer is arranged, the guide pipe, the dischargingpipes and an opening disperser are directly arranged, the quantity of the discharging points of one cell is above two times of the quantity of the presentdischargingpoints of one cell, thedischarging volume of the dischargingpoints is greatly reduced, the discharginguniformity of aluminum oxide of the aluminum cell is increased, the uniform distribution of the aluminum oxide concentration in the cell is benefited, the generation of sediment and anode effects is avoided, and the energy consumption of the electrolytic cell and the greenhouse gas emission are reduced.

Description

technical field [0001] A method for improving the uniformity of aluminum oxide blanking in an aluminum electrolytic cell relates to an improvement of a blanking method for a prebaked aluminum electrolytic cell. Background technique [0002] At present, the current pre-baked aluminum electrolytic cell blanking method is to install a shelling hammer above the discharge port of the fire hole. The tank control system controls the shelling hammer to regularly hit the discharge port to keep the discharge port unblocked. After that, the alumina is constant volume After the feeder, it enters the electrolyte through the feed port. The one-time feeding amount of each feeding point is the constant capacity of the constant-volume feeding device. Usually, 200kA electrolytic cells are equipped with 4 feeding points, and 500kA tanks are equipped with 6 feeding points. After the alumina enters the electrolytic cell, it is dispersed in the cell by the flow of the electrolyte driven by the f...

AI Technical Summary

Problems solved by technology

The three patents are to embed high-temperature-resistant and anti-oxidation feeding pipes in the covering material, and then push the alumina into the electrolytic cell through the pusher rod. The number of feeding points for each cell remains the same, but the feeding device, avoiding the consumption and wear of the shelling hammer head, and does not involve improving the uniformity of alumina blanking in the electrolytic cell

[0005] The patent (CN201220366223.6) is a real-time monitoring device for preventing jamming of the feeding port of an aluminum electrolytic cell and the patent (CN201120514378.5) is a real-time monitoring device for the feeding fault of an electrolytic cell. It is to monitor the failure of alumina blanking, but it does not fundamentally solve the problem of electrolytic cell jamming

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