Preheating starting method for inertia anode aluminum electrolyzer

A technology of preheating start and inert anode, which is applied in the field of preheating start of inert anode aluminum electrolytic cells, can solve the problems of unfavorable operation of inert electrodes and no direct consideration of whether the preheating start is successful or not, so as to improve the service life and improve the The effect of using the effect

Active Publication Date: 2010-05-19
GUIZHOU BRANCH CHINA ALUMINUM IND
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology does not directly consider whether the warm-up start is successful or

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The furnace is laid with 16 sets of internal heating resistors, and the direct current is passed through. The furnace is filled with solid electrolyte and heated for about 14 hours. The temperature of the electrolyte in the furnace is 700°C. Continuously add solid electrolyte until the electrolyte level is 32 cm. Then, reduce the power of the internal heating resistor to simulate the heat generation of the electrolytic cell during normal operation. At the same time, add fluoride salt and adjust the electrolyte composition. After 48 hours, the energy balance was established, and the side thickness was 8 cm. After the energy balance is stable, each time a group of internal heating resistors is disconnected, a group of inert anodes and cathodes (vertical electrolyzers) are replaced until the replacement is completed. After the electrode is fully preheated, the electrolyzer is powered on and started smoothly, and the normal operating voltage is 3.66V.

Embodiment 2

[0032] The furnace is laid with 16 sets of internal heating resistors, and the alternating current is passed through. The furnace is filled with solid electrolyte, and the temperature is raised according to the heating system. The final temperature of the electrolyte in the furnace is 750°C. Continuously add solid electrolyte until the electrolyte level is 32 cm. Then, reduce the power of the internal heating resistor to simulate the heat generation of the electrolytic cell during normal operation. At the same time, add fluoride salt and adjust the electrolyte composition. After 48 hours, the energy balance was established, and the side thickness was 7.8 cm. After the energy balance is stable, each time a group of internal heating resistors is disconnected, a group of inert anodes and cathodes (vertical electrolyzers) are replaced until the replacement is completed. After the electrode is fully preheated, the electrolyzer is powered on and started smoothly, and the normal op...

Embodiment 3

[0034] The furnace is laid with 16 sets of internal heating resistors, and the alternating current is passed through. The furnace is filled with solid electrolyte, and the temperature in the furnace reaches 650°C. Pour molten liquid electrolyte until the electrolyte level is 32 cm. Continue heating until the electrolyte temperature is 750°C. Then, reduce the power of the internal heating resistor to simulate the heat generation of the electrolytic cell during normal operation. At the same time, add fluoride salt and adjust the electrolyte composition. After 48 hours, the energy balance is established, and the thickness of the thinnest part of the furnace side is 6.2cm. After the energy balance is stable, each time a group of internal heating resistors is disconnected, a group of inert anodes (upper and lower structure electrolyzers) is replaced until the replacement is completed. After the electrode is fully preheated, the electrolyzer is powered on and started smoothly, an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a preheating starting method for an inertia anode aluminum electrolyzer, which is characterized in that the preheating starting process orderly comprises the steps of: (1) laying a set of electrical heaters which has same number of electrodes on a hearth, (2) filling up solid electrolyte in the hearth, electrically heating till the solid electrolyte fused, and continuously adding solid electrolyte till the electrolyte level meets the production requirement, (3) lowering the power of the electrical heater after the electrolyte level meets the production requirement, and simulating the heat value of normal running electrolyzer, and (4) supplying fluorine salt, adjusting the component of electrolyte, establishing energy balance and thickness of furnace stack, exchanging a set of inertia anode and cathode when switching off a set of inner heating resistance after reaching energy balance, electrifying on full load after finishing exchange. The method of the invention can preheat inertia anode electrolyzer, provide a nice running condition to the inertia anode in order to promote the use effect and prolong the service life of the inertia anode.

Description

technical field [0001] The invention relates to a preheating starting method suitable for an inert anode electrolyzer. Background technique [0002] Since the advent of Hall-Heroult's cryolite-alumina molten salt electrolysis method, roasting start-up has always been a very important process that large-scale aluminum electrolytic cells or industrial aluminum electrolytic cells must go through before normal operation. The quality of the roasting start-up of the electrolytic cell will directly affect the stable production of the electrolytic cell in the later stage of start-up, as well as various economic and technical indicators and the life of the cell. [0003] Roasting start is very important to aluminum electrolytic cells, and the method used for roasting start is even more critical. For large-scale prebaked anode aluminum electrolytic cells with upper and lower structures (anode on the top and cathode on the bottom), the commonly used roasting methods are: coke grain ro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C25C3/06
Inventor 杨建红李旺兴包生重
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap