Method for improving calcination temperature evenness of aluminium electrolysis cell
A technology of aluminum electrolytic cell and uniformity, which is applied in the field of aluminum electrolysis, can solve problems such as uneven roasting temperature of aluminum electrolytic cell, achieve strong practicality and promotion value, improve cathode current distribution, and improve the effect of roasting temperature uniformity
Active Publication Date: 2015-05-20
YUNNAN ALUMINUM
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[0004] The purpose of the present invention is to provide a method to improve the uniformity of the firing temperature of the aluminum electrolytic cell, effectively solve the problem of uneven firing temperature of the aluminum electrolytic cell, and achieve the purpose of high-efficiency, low-consumption and stable production of aluminum electrolysis
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[0016] 1. If figure 1 As shown, in the firing start-up stage of the aluminum electrolytic cell, based on the temperature of the tank shell at the artificial leg extension position, the temperature difference exceeds 200°C at the low temperature point, and asbestos fibers with a thickness of 50-80 mm are placed at this point to strengthen the outer shell at the lower temperature point. Heat preservation, by reducing the heat dissipation at the lower temperature point, improves the uniformity of the roasting temperature; when the local temperature is too high, when the temperature difference exceeds 200°C at the high temperature point, the forced air cooling of the air duct is used to avoid the vicious circle caused by local overheating.
[0017] 2. According to different groove types, adjust the contact surface area of the three anode soft connections at the aluminum outlet end and the flue end according to the proportional coefficient of 1.05 to 1.15. By increasing the anode ...
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Abstract
The invention discloses a method for improving the calcination temperature evenness of an aluminium electrolysis cell, which comprises the following steps of: 1) in an aluminium electrolysis cell calcination starting stage, taking the temperature of an artificial leg stretching position pot shell as a proof, putting an asbestos fiber with the thickness of 50-80mm on a low-temperature point position of which the temperature difference exceeds 200DEG C to reinforce external thermal insulation, and carrying out forced air cooling by an air pipe on a high-temperature point position of which the local temperature difference exceeds 200DEG C so as to prevent from causing vicious circle due to local overheating; 2) regulating the flexible connection contact surface area of three anodes of an aluminium outlet end and a flue end according to an equal ratio coefficient of 1.05-1.15; and 3) respectively adopting anode steel bars of which the thickness is 80mm, 75mm, 70mm and 65mm, and assembling with cathode carbon blocks. The cathode current distribution of the aluminium outlet end and the flue end is improved, the calcination temperature evenness is improved, and the technical problem that the calcination temperature of the aluminium electrolysis cell is uneven is solved.
Description
technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a method for improving the uniformity of the firing temperature of an aluminum electrolytic cell. Background technique [0002] The firing start of aluminum electrolytic cell is a key link in aluminum electrolysis. In the firing start-up stage of the aluminum electrolytic cell, there is a common problem of uneven firing temperature, and the maximum temperature difference can reach more than 300°C. Uneven firing temperature causes major problems: First, the local temperature is too high. The higher the local temperature, the stronger the conductivity, the serious damage of the anode, and even cause the anode to be broken and depolarized. The higher the local temperature, the greater the differential expansion of the cathode, which increases the risk of early leakage, and even causes early electrolyte leakage. Second, the local temperature is too low. The local te...
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IPC IPC(8): C25C3/20
Inventor 张建宇王新华张大信李俊刘永强
Owner YUNNAN ALUMINUM