Coupled heat/mass-balance model for analyzing correlation between excess AlF3 concentration and aluminum electrolyte temperature

Huang, Yongbo; Qu, Xiang-dong; Zhou, Jiemin

doi:10.1016/s1003-6326(08)60340-4

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…Industrial cells showed that if the bath temperature is higher by 10 o C than the required value, the current efficiency decreases by 2%, and the energy consumption increases by 3% [29]. If environmental temperature and Al2O3 concentration keep constant, the electrolyte temperature decreases linearly with increasing the excess AlF3 concentration [30] and its increase rate is dependent on the heat transfer property of the aluminum electrolyte, sidewall, and cell shell [31]. Electrolyte temperature at the early operation period is depending on electrolyte composition, cell design, the solubility of alumina [25], and also cell voltage [10].…”

Section: Cryolite Ratio and Electrolyte Temperaturementioning

confidence: 99%

Thermal Behavior of the early Life of an Aluminum Electrolysis Cell

Ali

Yuossif²,

Abdalla

et al. 2022

JERA

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The electrolytic production of aluminium starts after the completion of the cathode lining and the baking process. After that, the cell start-up period is followed by the early operating period. During the early operating period, the following parameters (cell voltage, metal height, electrolyte height, cryolite ratio, electrolyte temperature, and ledge formation) were measured and investigated. The required times for these parameters to reach the steady-state have been investigated. The cell voltage, metal height, electrolyte height, cryolite ratio, and electrolyte temperature were stabilized after 35, 25, 24, 86, and 45 days, respectively from cell start-up. These cells took four months to form a stable ledge at a thickness of 10 cm. Also, the thermal behavior of the sidewall carbon blocks was studied during the early operating period by inserting twenty thermocouples at these locations in three prebaked cells. The cell instability during the early operation period for these cells was illustrated.

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Section: Cryolite Ratio and Electrolyte Temperaturementioning

confidence: 99%

Thermal Behavior of the early Life of an Aluminum Electrolysis Cell

Ali

Yuossif²,

Abdalla

et al. 2022

JERA

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“…However, the side ledge melting with a higher SD will increase the energy consumption. The details are illustrated by (2) [13].…”

Section: 2mentioning

confidence: 99%

“…where m AlF3 emmision (kg/day) is the amount of AlF 3 emission in one day; m Al day (ton Al/day) is the amount of aluminum produced in one day; and F emission (kg F/ton Al) is the amount of fluorine emission per ton of aluminum, which is calculated as shown in (13).…”

Section: Alf 3 Evolution Analysismentioning

confidence: 99%

See 1 more Smart Citation

Evaluation strategy and mass balance for making decision about the amount of aluminum fluoride addition based on superheat degree

Yue¹,

Gui²,

Chen³

et al. 2020

Journal of Industrial &Amp; Management Optimization

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The purpose of aluminum fluoride (AlF 3) addition is to adjust the superheat degree (SD) in the aluminum reduction process. Determining the appropriate amount of AlF 3 to add has long been a challenging industrial issue as a result of its inherent complexity. Because of the decreasing number of experienced technicians, the manual addition of AlF 3 is usually inexact, which easily leads to an unstable cell condition. In this paper, an evaluation strategy based on the SD for AlF 3 addition is proposed. An extended naïve Bayesian classifier (ENBC) is designed to estimate the states of SD and its trends that represent the current and potential cell condition respectively, and then the process is graded by evaluating the estimated results based on fuzzy theory. The reduction process is divided into a few situations based on the evaluation grades, and mass balance is introduced to determine the amount of AlF 3 addition in each situation. The results of experiments show that the proposed strategy is feasible, and the effectiveness of AlF 3 addition is improved compared to the existing method. Moreover, automatic AlF 3 addition is promising based on the proposed strategy.

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Progress in Aluminum Electrolysis Control and Future Direction for Smart Aluminum Electrolysis Plant

Zhang

et al. 2016

JOM

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Coupled heat/mass-balance model for analyzing correlation between excess AlF3 concentration and aluminum electrolyte temperature

Cited by 5 publications

References 8 publications

Thermal Behavior of the early Life of an Aluminum Electrolysis Cell

Thermal Behavior of the early Life of an Aluminum Electrolysis Cell

Evaluation strategy and mass balance for making decision about the amount of aluminum fluoride addition based on superheat degree

Progress in Aluminum Electrolysis Control and Future Direction for Smart Aluminum Electrolysis Plant

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