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Electrolytic aluminum is aluminum obtained by electrolysis. Cryolite - alumina molten salt electrolysis is used in modern electrolytic aluminum industry. Molten cryolite is a solvent, aluminum oxide is use as solute, carbon body is used as anode, aluminum liquid is use as cathode, strong direct current is introduced, and then electrochemical reaction is carried out on two poles in an electrolytic bath at 950 - 970 deg c, so that electrolysis is carry out. 

In recent years, China's electrolytic aluminum industry has made great progress. in 2005, China's electrolytic aluminum output reached 7.8 million t, which is the largest aluminum producing country in the world.
● bottleneck 1 - life problem of aluminum electrolysis cell
The problems affecting the life of large-scale aluminum electrolysis cell in China are not only the reasons of cathode carbon material quality generally considered, but also some problems exist in the design of electrolysis cell, furnace building materials, furnace building quality, roasting start - up, normal production operation and production management. 
A large number of large prebaked electrolyzers have been built in China, which has become the main power of electrolytic aluminum production in China. Large prebaked cell has large current ( 200 - 500 ka ), large output, high automation degree, environmental protection, energy saving and high current efficiency. Therefore, a higher requirement is put forward on various materials including refractory materials for laying the electrolytic cell, so as to ensure that the electrolytic cell has a long service life.
● bottleneck 2 - high energy consumption
40 % of the cost of electrolytic aluminum comes from energy consumption.
New generation of aluminum electrolysis cell building materials: aluminum electrolysis cell backing insulation board
The invention relates to a backing heat insulation board of an aluminum electrolysis cell, in particular to a ceramic fiber board hlgx - 164 with a specific specification for the aluminum electrolysis cell.
The invention relate to an aluminum electrolytic cell backing heat insulation board, which mainly prolong that service life of the aluminum electrolytic cell by reducing the temperature of the outer wall, improving the current effect and improve the insulation effect of the aluminum electrolytic cell lining, thereby saving energy and reducing consumption and increasing economic benefit.
Low aluminum electrolytic cell backing insulation board

The product is made of ceramic fiber as main material, inorganic filler, inorganic binder and a small amount of organic binder, and is processed by vacuum squeezing and filtering, long net forming, drying and other processes. The product has the advantages of accurate size, low thermal conductivity, high compressive strength and good heat preservation performance.
● performance of backing insulation board for aluminum electrolysis cell:
1. good toughness: the aluminum electrolysis bath backing insulation board has high ceramic fiber content, ensures that the fiberboard has good toughness to absorb the stress generated by thermal expansion, ensures the safety and stability of the lining, and simultaneously solves the problems of brittleness, fragility and high construction damage rate of the calcium silicate board;
2. the geometric size precision is high, deviation within 3 mm, easy to cut molding, ensure the construction quality;
3. the refractory temperature is high, the highest use temperature can reach 1050 ℃;
4. low thermal conductivity;
5. stable chemical properties;
6. the aluminum electrolysis cell has regular size, few construction joints and no need of expansion joints, thus prolonging the service life of the aluminum electrolysis cell.
Heat insulation structure of aluminum electrolysis cell
In electrolytic cell, the application of ceramic fiber board is mainly used as insulation layer at the bottom and side of electrolytic cell. 
Side wall structure: working layer + silicon nitride bonded silicon carbide brick + impervious material + hlgx - 164 aluminum electrolytic cell backing heat insulation board ( 50 ~ 80 mm )
Bottom structure: working layer + impervious material + insulation brick ( 65 mm ) + hlgx - 164 aluminum electrolytic cell backing insulation board ( 100 ~ 130 mm ) aluminum electrolytic cell backing insulation board before and after use effect comparison case
Installation step and use method of backing heat insulation board of aluminum electrolysis cell

1, First of all, the furnace wall steel plate for inspection, leveling, and routine derusting, anticorrosive processing, maintenance tank cannot be leveling parts need to use alumina powder leveling;
2, According to the construction requirements of the thickness of the ceramic fiber board tile to the furnace wall, the joint between the block and block to butt tightly, need to carry on the wrong seam lap processing between layer and layer, the corner to cut flat processing, each layer of ceramic fiber board after the completion of the construction, must use alumina powder for caulking processing, in order to ensure the maximum use effect;
3, Fiberboard construction is completed, the upper need to lay insulation brick and impervious material.
Storage and transportation matters needing attention:
● Damp - proof and rain-proof are required during transportation and storage;
● Prevent collision during loading and unloading, and prevent collision of other hard objects during storage;
● It is strictly prohibited to stack heavy objects at the top of stacking, and the height shall be less than 3m;
Installation considerations:
● Fibreboard shall be cut by hand saw or chainsaw;
● During construction, construction personnel shall wear labor protection articles such as gloves and masks;
Low construction process should pay attention to waterproof, moistureproof;
● In order to prevent warping deformation of fiber felt / board during use, installation shall be carried out under no stress conditions; Installation requirements level off, tight seam without leakage.