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Sinter and carbonize the tamping paste between the cathode carbon blocks and between the cathode carbon blocks and the side lining, and form a whole with the lining carbon blocks, so as to avoid the cathode damage caused by "thermal shock" during the subsequent start-up of the electrolytic cell(white aluminium oxide wholesale direct pakistan). Generally, cryolite is used to cover the gap between the anode and fill the anode.

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Because the melting and burning makes the electrolytic planting ellipsoid, cathode and anode close to or reach the temperature during normal production, the molten electrolyte added during startup will not solidify in the tank, especially on the surface of cathode carbon block(brown aluminum oxide). The aluminum liquid is poured into the electrolytic cell, which is always in liquid state and can keep good contact with cathode and anode(white aluminium oxide wholesale direct pakistan).

Because the total calorific value of liquid aluminum preheating is small, the insulation on the anode needs to be specially strengthened(glass bead blasting media suppliers). If cracks or voids appear in the cathode carbon block or tamping paste, aluminum water will be injected into it, which is easy to become an aluminum liquid penetration channel after startup, resulting in early damage of the cathode(white aluminium oxide wholesale direct pakistan). Coke particle melting method.

Therefore, the aluminum industry has the following basic requirements for the melting and burning of electrolytic cell(aluminium oxide blasting): slowly heat the carbon cathode to the operating temperature (900-950 ℃) according to a certain temperature rise curve to avoid large thermal stress in the carbon cathode(180 grit aluminum oxide). In this way, after the electrolytic cell is powered on, the coke particle layer acts as a resistor to generate Joule heat(white aluminium oxide wholesale direct pakistan). 

Evenly heat the working surface of the carbon cathode to make the temperature distribution on the cathode surface as uniform as possible and avoid large temperature gradient on the cathode surface(black corundum). Ensure the adhesion between cathode carbon blocks and side carbon paste(white aluminium oxide wholesale direct pakistan). Liquid aluminum is used as a resistor and heated by electricity to achieve the purpose of preheating and melting. 

What are the preheating, melting and burning methods of pre molten aluminum electrolytic cell at present(aluminium oxide blast media)? At present, there are four preheating and melting methods for industrial aluminum reduction cell: liquid aluminum melting method(white aluminium oxide wholesale direct pakistan). For the pre cultured anode electrolytic cell, the anode and cathode are burned at high temperature, and their resistance value is not large, so the total heating capacity is not large. 

Graphite powder is used as resistor and heated by electricity to achieve the purpose of preheating and burning(pink aluminum oxide). The rod hole (carbon bowl) shall meet the requirements of the drawing; The diameter, depth and spacing of the carbon bowl depend on the anode steel claw(alumina sand). Because the resistance value of molten aluminum itself is very small, most of the heat of molten aluminum burning depends on the cathode and anode(white aluminium oxide wholesale direct pakistan). 

The first three methods can also be collectively referred to as resistance burning method, and the fourth method can also be called external heating method or heat burning method(aluminum oxide sandblasting media). In the whole service life of the electrolytic cell, although the preheating and start-up process is very short, only a few days, it has a decisive impact on the service life of the electrolytic cell, which must be paid enough attention(white aluminium oxide wholesale direct pakistan). 

Its basic principle and process is to pour the liquid lead extracted from other electrolytic cells into the electrolytic cell to be burned(alumina abrasive), make it cover the cathode surface and fill the space between anode and cathode, and then disconnect the short intersection of electrolytic essence to make a series of current pass through the electrolytic cell(white aluminium oxide wholesale direct pakistan). The coke particles and coke powder attached to the filler must be removed.

In this way(green silicon carbide), the anode guide rod can be directly tightened on the anode bus by preheating and melting of molten aluminum, and a full series of current can be connected at one time without installing and splitting current transformer and intermediate soft connection(aluminum oxide abrasive powder). It can be used not only as the thermal insulation material in the preheating process, but also as the raw material in the subsequent startup stage(white aluminium oxide wholesale direct pakistan).

It does not need to be taken out and replaced, which saves labor and materials, and can keep the raw material clean(white aluminium oxide wholesale direct pakistan). When a series of currents pass through the anode, liquid aluminum and cathode, the resistance heat generated by these conductors preheat and burn the electrolytic cell(100 grit aluminum oxide). Coke particles are used as resistance body and heated by electricity to achieve the purpose of preheating and melting. 

The sudden temperature rise of the electrolytic cell evaporates a large amount of water in the cell lining(80 grit aluminum oxide), and the pressure generated by its expansion is easy to arch out from the weak connection between the carbon block and the tamping paste or a weak part of the tamping paste in the plastic state, resulting in cracks or pores at the bottom of the cell(white aluminium oxide wholesale direct pakistan). Graphite powder melting method. 

Due to the small resistance value of liquid aluminum, low calorific value and slow heating rate, the cycle of liquid aluminum melting and coke particle melting is longer (about 7 ~ 8 days, about 2 ~ 3 days longer than coke particle burning), and the final temperature of liquid aluminum melting is often low, which is easy to cause incomplete coking of tamping paste(black silicon carbide). Fuel fusion method(white aluminium oxide wholesale direct pakistan). 

Together with the resistance heat of the anode and cathode itself, the electrolytic cell, cathode and anode are heated and heated to achieve the purpose of preheating and burning(white aluminium oxide wholesale direct pakistan). The so-called shunt technology is to use a shunt to divide a part of the series current and let it flow from the anode bypass to the cathode, so as to avoid too large current and too fast temperature rise in the early stage of sintering(aluminum oxide sand). 

Make the resistance between each anode and coke particles as balanced as possible(garnet sand). The good conductivity and thermal conductivity of liquid aluminum can make the cathode surface temperature distribution quite uniform(white aluminium oxide wholesale direct pakistan). The device for coke pellet burning is shown in the figure(aluminum oxide for sale). Until the end of melting and burning, tighten the anode guide rod on the anode bus before starting, and then remove the soft connection.

The parts not covered by coke particles around the electrolytic cell, including side carbon blocks and surrounding tamping paste, need to be protected from oxidation during the sintering process(120 grit aluminum oxide). This method of slowly increasing the anode to control the heating rate is simple and accurate(white aluminium oxide wholesale direct pakistan). Use oil, natural gas, coal gas or other man-made gas for combustion and heating to achieve the purpose of preheating and melting.

Therefore(70 grit aluminum oxide), in this stage, the adsorbed water is mainly discharged, the volume expands, the asphalt begins to migrate, and the coal asphalt in the green gap is redistributed due to capillary action(white aluminium oxide wholesale direct pakistan). After preheating for a certain time, the heat can be increased and the temperature can be increased by slowly raising the anode and increasing the polar distance, so as to achieve the purpose of good preheating(steel grid).