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Method for unloading aluminum oxide from prebaking aluminum electrolysis cell

An aluminum electrolytic cell and alumina technology, which is applied in the field of aluminum electrolytic production, can solve the problems of easy crusting and agglomeration, difficult electrolyte dissolution and dispersion, etc., so as to reduce the occurrence of anode effect, reduce the emission of greenhouse gas, dissolve speed up effect

Active Publication Date: 2018-11-27
CENT SOUTH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: aiming at the problem that the existing alumina is easily crusted and agglomerated into agglomerates, which makes it difficult to dissolve and disperse in the electrolyte, and to provide a new type of alumina blanking method for prebaked aluminum electrolytic cells

Method used

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Examples

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Effect test

Embodiment 1

[0027] In the four outlets of the prebaked aluminum electrolytic cell with a capacity of 200kA, four are designed to use 50% (Ni-Fe-Cu) / 50% NiFe 2 o 4 The feeding tube of the cermet tube, the inner and outer walls of the feeding tube are coated with CeO with a thickness of 0.05mm 2 The outer diameter of the tube is 125mm and the inner diameter is 95mm; the upper end of the feeding tube is connected to the fixed container by welding, and the distance between the lower end of the feeding tube and the electrolyte surface in the aluminum electrolytic cell is 60mm; The 1200mm, 500mm and 100mm positions are designed with baffle valves for alumina to stay, and divide the feeding pipe into three chambers for alumina to stay.

[0028] When the hammer head of the shelling device hits the crust on the electrolyte surface of the discharge port, the alumina coming out of the fixed container enters the circular tube and stops at the baffle valve at a vertical position of 1200mm from the el...

Embodiment 2

[0036]In the six feeding ports of the prebaked aluminum electrolytic cell with a capacity of 500kA, six feeding tubes using 60% Ni-15% Fe-25% Cu metal tubes are respectively designed, and the inner and outer walls of the feeding tubes are coated with a thickness of 0.2mmCeO 2 The outer diameter of the tube is 110mm and the inner diameter is 100mm; the upper end of the feeding tube is connected to the fixed container by welding, and the distance between the lower end of the feeding tube and the electrolyte surface in the aluminum electrolytic cell is 80mm; The 1000mm and 110mm positions are designed with baffle valves for alumina to stay, and divide the feeding pipe into two chambers for alumina to stay.

[0037] When the hammer head of the shelling device hits the shell on the electrolyte surface of the discharge port, the alumina coming out of the fixed container enters the circular tube and stops at the baffle valve at a vertical position of 1000mm from the electrolyte surfa...

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PUM

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Abstract

The invention discloses a method for unloading aluminum oxide from a prebaking aluminum electrolysis cell. According to the method, the crust breaking and the unloading of the prebaking aluminum electrolysis cell are simultaneously carried out, aluminum oxide is intermittently remained at least twice in a discharging pipe after entering into an unloading pipe from a fixed container, the intermittent remaining efficiency is accordant with the crust breaking frequency, and the crust breaking is carried out before each time of remaining of aluminum oxide. Aluminum oxide is subjected to segmentation remaining in the unloading pipe and is preheated by virtue of the high temperature of the aluminum electrolysis cell, so that the situation that aluminum oxide newly added into the electrolysis cell is agglomerated with electrolyte into blocks is effectively avoided, the dissolution and dispersion of aluminum oxide are accelerated, precipitates are unlikely to form at the bottom of a furnace, and the efficient and steady working of the electrolysis cell is promoted.

Description

technical field [0001] The invention belongs to the production technology of aluminum electrolysis, and in particular relates to an alumina blanking method for a prebaked aluminum electrolytic cell. Background technique [0002] In the aluminum electrolytic production process, alumina is the main production raw material. Whether it can be smoothly added to the electrolytic cell and dissolved into the electrolyte melt has an important impact on the efficient and stable operation of the prebaked aluminum electrolytic cell. The current pre-baked aluminum electrolytic cell blanking method widely adopts point-type blanking: the shelling hammer is controlled by the tank control system to regularly hit the blanking opening, and then the alumina enters the electrolyte melt through the constant-volume blanking device and the blanking opening. On the surface, under the action of electrolyte flow and concentration diffusion, alumina is dispersed in the electrolytic cell. [0003] When...

Claims

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Application Information

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IPC IPC(8): C25C3/14
CPCC25C3/14
Inventor 赖延清田忠良李松贤孙春生张正英周亮李贺松沈冰丁浩刘强军高杨赵锡斌
Owner CENT SOUTH UNIV
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