Simulation device for furnace wall liquation process of aluminum electrolysis cell and use method of simulation device
A technology of process simulation and simulation device, which is applied in the field of aluminum electrolysis, can solve the problem that the simulation device cannot truly simulate the melting and segregation behavior of the furnace side of the aluminum electrolytic cell, and achieve the effects of rapid response, uniform temperature and convenient adjustment
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Embodiment 1
[0036] Such as Figure 1~4 As shown, the aluminum electrolytic cell furnace side smelting process simulator of this embodiment includes a simulator body, an air cooling system and a temperature control system; the simulator body is an inverted T-shaped structure, and the simulator body includes a base 1 and a vertical On the cuboid cold wall 2 of the base 1, a hollow interlayer is provided in the cold wall 2, specifically a cuboid cooling cavity 4, a sealing rod 3 is arranged on the upper part of the cooling cavity 4, and a sealing rod 3 is provided on the sealing rod 3 Cooling gas inlet and gas outlet.
[0037] The air cooling system is connected to the cooling cavity 4 and cools the cooling cavity 4; specifically, the temperature of the cold wall 2 is controlled to be lower than the primary crystal temperature of the electrolyte by passing circulating cooling gas into the cooling cavity 4, so that the electrolyte is The outer side of the cold wall solidifies and precipitate...
Embodiment 2
[0043] Figure 5 In order to pass high-purity nitrogen gas into the cooling cavity of Example 1 at a flow rate of 30 L / min for cooling, so that the temperature of the cold wall is lower than the temperature of the molten electrolyte by 10°C (ie, the degree of superheat), the solidified furnace side sample is obtained from Figure 5 It can be seen that the shape of the side of the furnace obtained is continuous and regular, indicating that the overall temperature of the cold wall can be uniformly reduced by introducing the cooling gas into the cooling cavity, which better simulates the growth process of the side of the electrolytic cell.
Embodiment 3
[0045] Figure 6 In the middle is the cooling gas into the cooling cavity of Example 1 to lower the temperature of the cold wall to about 20°C below the temperature of the molten electrolyte (degree of superheat), and keep it stable for 2 hours before the solidified side is precipitated. By analyzing its microstructure, it is found that the part close to the cold wall side is in a columnar crystal state with a dense structure; the XRD results are as follows Figure 7 shows that its main component is cryolite (Na 3 AlF 6 ), with a small amount of sub-cryolite (Na 5 Al 3 f 14 ). The outer layer of the side near the molten electrolyte has loose structure and high porosity. Figure 8 It can be seen from the XRD pattern that the main phase of the outer layer is sub-cryolite. The structure and composition of the side of the furnace are similar to the real side of the 500 kA aluminum electrolytic cell reported in the literature (Zhang Qinsong. The influence of the heat and mas...
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