Method for early warning and inhibiting on-line anode effect of aluminum electrolysis cell

An anode effect and aluminum electrolytic cell technology, applied in the field of aluminum electrolysis, can solve the problems of insufficient forecasting, achieve energy-saving greenhouse gas, and realize the effect of low-voltage non-effect production

Active Publication Date: 2012-12-05
中铝郑州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the forecast by traditional methods is often not timely enough.

Method used

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  • Method for early warning and inhibiting on-line anode effect of aluminum electrolysis cell
  • Method for early warning and inhibiting on-line anode effect of aluminum electrolysis cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Open holes in the flue of a single aluminum electrolytic cell to collect gas. The gas enters the gas analyzer through filtration and drying. The gas analyzer conducts online continuous analysis of the gas composition and obtains the CF in the flue gas in real time. 4 concentration, and communicate the analysis results to the aluminum electrolytic cell control system.

[0031] When CF 4 When the concentration is zero, the electrolyzer operates normally, when CF 4 When the concentration mutation is not zero, that is, the minimum resolution of the detection equipment, such as: 0.01ppm, it can be judged that there has been an electrolytic side reaction at this time, and the overall or local alumina concentration of the electrolytic cell is already in a critical state. The alumina concentration is the critical alumina concentration under the process conditions.

[0032] When the electrolytic cell is in the state of critical alumina concentration, the corresponding alumina ...

Embodiment 2

[0036] Collect gas from openings in different areas of a single aluminum electrolytic cell, such as fire holes in different areas. The gas enters the gas analyzer through filtration and drying, and the gas analyzer conducts online continuous analysis of the gas composition, and obtains the CF in the flue gas in real time. 4 concentration, and communicate the analysis results to the aluminum electrolytic cell control system.

[0037] when a CF 4 When the concentration mutation is not zero, that is, the minimum resolution of the detection equipment, such as: 0.01ppm, at this time it can be judged that there has been an electrolytic side reaction near this position, and the local alumina concentration of the electrolytic cell is already in a critical state. , the control system can carry out local effect suppression processing on this area. Add alumina feed to the feeder corresponding to this area. If CF 4 The increase time of each minimum resolution of the gas concentration ...

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Abstract

The invention provides a method for identifying on-line aluminum oxide critical concentration and early warning and inhibiting an anode effect of an aluminum electrolysis cell. The aluminum oxide critical concentration of the electrolysis cell is identified by monitoring perfluorochemical (PFC) gas content change of smoke in the aluminum electrolysis cell, and the anode effect is predicted and inhibited. The method can be used for identifying the aluminum oxide critical concentration and early warning and inhibiting the effect of the aluminum electrolysis cells with different structures and different current levels under various cell conditions, the effect predicting and inhibiting success rate can reach 100 percent, the effect is inhibited in an initial state, and low-voltage effect-free production of the electrolysis cell is realized. The method is beneficial to accurate control of the aluminum oxide concentration in the aluminum electrolysis production process and beneficial to energy conservation and emission reduction of greenhouse gases in the aluminum electrolysis industry.

Description

technical field [0001] The invention belongs to the field of aluminum electrolysis, and in particular relates to a method for identifying critical concentration of aluminum oxide, early warning and suppressing anode effect in the production process of an aluminum electrolytic cell. Background technique [0002] The process of producing primary aluminum by the Holel method is: melting alumina in high-temperature molten cryolite, direct current through the carbon anode of the electrolytic cell, generating carbon dioxide at the bottom of the anode, and generating aluminum liquid on the surface of the cathode. [0003] 2Al 2 o 3 + 3C = 4Al + 3CO 2 [0004] When the alumina concentration of the electrolytic cell is in a suitable range, normal production can be carried out, and the change of the alumina concentration will lead to a corresponding change of the cell voltage of the electrolytic cell. The relationship between the alumina concentration and the cell voltage is: when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
Inventor 李旺兴杨建红张艳芳邱仕麟陈喜平柴登鹏刘志明
Owner 中铝郑州有色金属研究院有限公司
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