Method for measuring molecular ratio of electrolyte in aluminum electrolysis process

A measurement method and electrolyte technology, applied in the field of aluminum electrolysis, can solve the problems of lack of great guiding significance in the production process, error in measurement results, and high labor intensity of electrolyte molecules.

Inactive Publication Date: 2014-07-30
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] At present, the molecular ratio of the aluminum electrolysis process needs to be sampled and analyzed offline, and the electrolyte molecular ratio is analyzed offline by chemical or instrumental methods, usually once a week, which cannot meet the needs of the production process.
Because the sampling, remelting and crystallization process will change the composition of the electrolyte, resulting in occasional errors in the measurement results, and the hysteresis of off-line analysis, the measurement of the electrolyte molecular ratio is not only labor-intensive, but also the analysis results have no great impact on the production process. Guiding significance

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  • Method for measuring molecular ratio of electrolyte in aluminum electrolysis process

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Embodiment Construction

[0015] Since the molecular ratio of the electrolyte is calculated from the concentration of aluminum fluoride and sodium fluoride in the electrolyte, the chemical properties of sodium fluoride are relatively stable, and the concentration in the electrolyte does not change much with time, so it can be taken as a constant in a sampling period. Aluminum fluoride is volatile and is constantly added during the electrolysis process to keep the electrolysis process running efficiently. The molecular ratio can be calculated by estimating the concentration of aluminum fluoride, and this calculated molecular ratio is called the equivalent molecular ratio in this paper.

[0016] see figure 1 , the soft sensor method of the present invention is divided into several steps:

[0017] (1) Off-line parameter identification to determine the coefficients of the aluminum fluoride increment calculation equation in the electrolyte.

[0018] The core of this method is the calculation of the alumin...

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Abstract

The invention discloses a method for measuring molecular ratio of electrolyte in an aluminum electrolysis process. The method comprises the following steps: (1) determining a coefficient of an incremental calculation formula of aluminum fluoride in electrolyte, wherein the calculation formula is shown as WapAlF=alpha(T-temp0)+betaAlFg+gammaWaAlF+a(T-temp0)2+bAlFg2+c(T-temp0)AlFg+d; (2) calculating the addition frequency and weight each time according to the measured electrolyte level and aluminum fluoride; (3) calculating increment of the aluminum fluoride by utilizing the formula in the step (1); (4) calculating a rolling error; and (5) calculating an equivalent molecular ratio. According to the method, the aim of molecular ratio measurement is achieved, and a basis is provided for control of an electrolytic cell.

Description

technical field [0001] The invention belongs to the field of aluminum electrolysis, in particular to a method for measuring the molecular ratio of an electrolyte in an aluminum electrolysis process. Background technique [0002] Substantial energy saving and consumption reduction is the goal that the government and aluminum metallurgists have been working hard for. In recent years, the automation and intelligent research of aluminum electrolysis has been very active. Although great achievements have been made, the bottleneck problem limiting its development has not been well resolved, and many parameters reflecting process characteristics are difficult to measure online. Molecular ratio is one of the most important technical conditions. A high molecular ratio will lead to higher electrolysis temperature, increased energy consumption, and reduced life of the electrolytic cell. If the molecular ratio is too low, it will be difficult to dissolve alumina, and the concentration o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 曾水平琚廷瑞廖春云曲亚鑫
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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