Alumina continuous feeding device

Abstract

The invention provides a continuous aluminum oxide blanking device. The continuous aluminum oxide blanking device comprises an aluminum oxide material bin, a blanking channel, a constant volume device, a blanking tube and a crust breaking device, wherein the blanking channel is connected with the bottom of the aluminum oxide material bin and provided with a containing space, the constant volume device is contained in the containing space and communicated with the bottom of the aluminum oxide material bin, the crust breaking device is opposite to the blanking tube and the blanking channel in a spaced mode, the blanking tube comprises a feeding opening formed in the top of the blanking tube and a discharging opening formed in the bottom of the blanking tube, and the feeding opening is communicated with the bottom of the blanking channel. Compared with the prior art, according to the continuous aluminum oxide blanking device, intermittent blanking is changed into continuous blanking, aluminum oxide passes through the blanking channel and then slowly enters the blanking tube, blanking is conducted stably, fluctuation of the temperature of an electrolytic tank and the concentration of the aluminum oxide is reduced, electric current efficiency is further improved, and energy consumption is lowered.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to an alumina continuous feeding device. Background technique [0002] With the increase of the capacity of modern aluminum electrolytic cells, and the low pole distance technology implemented by the aluminum industry in pursuit of energy saving of aluminum electrolytic cells, some aluminum factories have adopted the method of weakening the melt in the tank to resist the fluctuation of the aluminum liquid in the tank. The flow design makes it more and more difficult for the alumina added to the electrolyte to be transported and dispersed in the tank after the current quasi-continuous feeding method based on point feeding. [0003] see figure 1 , is a schematic structural diagram of an alumina blanking device in the prior art. The alumina point blanking device uses a timing constant volume blanking device for intermittent blanking. The alumina point-type feeding devic...

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Problems solved by technology

[0004] Since the feeding method of the alumina point-type feeding device is intermittent feeding, the concentration of alumina fluctuates significantly, the concentration before feeding is low, the concentration after feeding is high, and the heat balance of the tank fluctuates greatly, which affects the stability and stability of the aluminum electrolytic cell. Current efficiency; a large amount of alumina is fed into a single batch of point feeding method, but the current low superheat process makes the dissolution process of alumina more difficult, and the undissolved alumina sinks into the aluminum liquid, which causes the aluminum liquid below the feeding port A large amount of alumina precipitates accumulate in the layer, and the precipitate covers the bottom of the furnace with the flow of aluminum liquid, resulting in an increase in the pressure drop at the bottom of the furnace and increased energy consumption. A large amount of alumina is easy to collide with the shelling device after accelerating on the inclined wall, causing part of the alumina to scatter on the cell cover of the aluminum electrolytic cell, and the actual reduction of the input material will easily cause the anode effect, destroy the thermal balance of the aluminum electrolytic cell, and increase energy consumption

Therefore, the aluminum oxide point-type feeding device of the related art has the disadvantages of large fluctuations in the thermal balance of the aluminum electrolytic cell after feeding, poor stability of the aluminum electrolytic cell, low current efficiency, and high energy consumption.

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