Aluminum cell inner lining

Abstract

The invention relates to an internal liner for an aluminum electrolytic cell, which is characterized in that: the internal liner of the electrolytic cell is built by clay firebricks with high density and low porosity, and the apparent porosity of the internal liner is between 13 and 15 percent. The internal liner for the aluminum electrolytic cell can effectively reduce the erosion degree of electrolyte on the fireproof internal liner, reduces the occurrence degree of unfavorable conditions such as breakage and cell shutting of the electrolytic cell, great loss of an aluminum liquid and the electrolyte, obviously worsened technical and economic indicators, reinforced distortion of a cell shell, improved electrolysis production cost of aluminum, reduced economic benefit and so on due to the fact that the electrolyte and the aluminum are leaked into cracks to dissolve a cathode steel bar caused by lifted furnace bottom, local bending and fine-drawing of the cathode steel bar, and the cracks generated between the cathode steel bar and a cathode carbon block because the cathode carbon block is protruded upwards, and has good functions of further energy conservation, long service life and high efficiency on the aluminum electrolysis production.

Description

technical field [0001] The invention relates to an inner liner of an aluminum electrolytic cell. Background technique [0002] In the production process of aluminum electrolysis, part of the electrolyte will penetrate the cathode carbon block and erode the refractory lining material. The traditional refractory lining material is anti-seepage material or ordinary clay refractory brick. Long-term production practice experience shows that the two Traditional refractory lining materials have certain problems: [0003] 1) For the case of using anti-seepage material refractory lining, with the prolongation of the production tank age, the anti-seepage material gradually reacts with the infiltrated part of the electrolyte to form a substance with increased volume, and the reaction area gradually moves towards the anti-seepage The lower layer of material develops, the degree of reaction is more intense in the higher temperature area, the reaction area is deeper, and even partial com...

AI Technical Summary

Problems solved by technology

This kind of material that has increased in volume through the occurrence of partly infiltrated electrolyte has caused the cathode carbon block to bulge upward, causing the bottom of the furnace to lift, the cathode steel rod to be locally bent and thinned, and the gap between the cathode steel rod and the cathode carbon block Cracks appear to cause electrolyte and aluminum to infiltrate into such cracks, and melting of cathode steel rods leads to early damage and shutdown of the electrolytic cell, a large loss of aluminum liquid and electrolyte, obvious deterioration of technical and economic indicators, intensified deformation of the cell shell, and aluminum electrolytic production. Rising costs and declining economic benefits

[0004] 2) For the lining of ordinary clay refractory bricks, the apparent porosity of ordinary clay refractory bricks is relatively high, generally 22-28%. Infiltration into the gaps of ordinary clay refractory bricks will cause a certain reaction, which will deteriorate the ordinary clay refractory bricks, and part of the electrolyte will gradually infiltrate into the insulation material below, and the thermal conductivity of ordinary clay refractory bricks and insulation bricks will increase significantly. The ground rises sharply, the heat loss of the electrolytic cell increases significantly, the bottom of the electrolytic cell becomes colder, the heat balance is destroyed, the primary crystal temperature isotherm moves to the cathode carbon block, the bottom voltage drop increases, and the power consumption increases. Large, the current efficiency is reduced, the cathode carbon block is damaged in advance and the tank is stopped in advance, which shortens the life of the tank, affects the technical and economic indicators, and increases the production cost