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Protection method for separating electrode guide rod from corrosion caused by electrolyte melt

A technology of electrolyte and melt, applied in the field of electrode guide rod protection of inert electrode aluminum electrolytic cell, to achieve the effect of improving long-term stability and reliability, simple assembly process and easy operation

Active Publication Date: 2015-04-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above patents or documents, there are certain limitations on the method of isolating the electrolyte melt corrosion and protecting the electrode guide rod or the materials used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use reagent sodium carbonate 5wt%, industrial heavy calcium carbonate 4wt%, reagent calcium oxide 5wt%, reagent sodium fluoride 5wt%, reagent boron oxide 1wt%, industrial alumina 81wt%, prepare refractory powder 3, fill in the electrode Around the guide rod 2. The thickness of the refractory powder 3 along the radial direction of the guide rod is 2mm.

[0027] The composite corrosion-resistant ceramic casing has two layers. The inner layer 4 is a whole boron nitride casing, the outer layer is divided into upper and lower sections, the upper section 8 is nickel ferrite / nickel oxide / nickel aluminate composite ceramic casing, and the lower section 6 is zinc aluminate / titanium oxide composite Ceramic casing, the upper and lower sections are butted with snap buttons. The corundum castable slurry is poured between the two layers of casing 7 . Above the electrode 1 and other than the sleeves 6 and 8, the corundum castable 5 is used for integral pouring.

[0028] Among them...

Embodiment 2

[0031] Use 2wt% sodium carbonate as a reagent, 8wt% industrial heavy calcium carbonate, 1wt% calcium oxide as a reagent, 20wt% sodium fluoride as a reagent, 5wt% boron oxide as a reagent, and 64wt% industrial alumina to prepare refractory powder 3, and fill it in the electrode guide rod 2 around. The thickness of the refractory powder 3 along the radial direction of the guide rod is 4mm.

[0032] The composite corrosion-resistant ceramic casing has two layers. The inner layer 4 is a whole silicon carbide casing, the outer layer is divided into upper and lower sections, the upper section 8 is nickel ferrite / nickel oxide / nickel aluminate composite ceramic casing, and the lower section 6 is zinc aluminate / titanium aluminate composite Ceramic casing, the upper and lower sections are butted with snap buttons. 7 between the two layers of casing is refractory powder, which has the same composition as refractory powder 3 . Above the electrode 1 and other than the sleeves 6 and 8, t...

Embodiment 3

[0036] Use 10wt% of reagent sodium carbonate, 1wt% of industrial heavy calcium carbonate, 1wt% of reagent calcium oxide, 1wt% of reagent sodium fluoride, 1wt% of reagent boron oxide, and 86wt% of industrial alumina to prepare refractory powder 3, and fill it in the electrode guide rod 2 around. The thickness of the refractory powder 3 along the radial direction of the guide rod is 4mm.

[0037] The composite corrosion-resistant ceramic casing has two layers. The inner layer 4 is a whole boron nitride / aluminum nitride composite casing, the outer layer is divided into upper and lower sections, the upper section 8 is a nickel ferrite / nickel oxide / nickel aluminate composite ceramic casing, and the lower section 6 is alumina acid Zinc / titanium oxide composite ceramic casing, the upper and lower sections are butted with snap buttons. 7 corundum castable slurry between the two layers of casing. Above the electrode 1 and other than the sleeves 6 and 8, the corundum castable 5 is us...

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Abstract

The invention discloses a protection method for separating an electrode guide rod from corrosion caused by electrolyte melt and in particular relates to a protection method of a noble electrode aluminium cell electrode guide rod. The method is characterized in that fire-resistant powder is prepared from sodium carbonate, calcium carbonate, calcium oxide, boric oxide, sodium fluoride, and industrial aluminium oxide which are used as raw materials, and can react with the electrolyte melt fast to generate a solid crusting with the high melting point; the fire-resistant powder is fed between the electrode guide rod and a compound anti-corrosion ceramic protection sleeving tube; when an electrode is in normal electrolysis operation, the electrolyte melt permeating from gaps or micropores can react with the fire-resistant powder to form the compact crusting to obtain an electrode guide rod protection layer for separating the corrosion caused by the electrolyte melt; the further permeating of the electrolyte melt and the electrochemical corrosion of the electrolyte melt to the guide rod can be blocked by the protection layer; the compound anti-corrosion ceramic protection sleeving tube can be used for resisting the dissolving corrosion caused by the electrolyte melt. In the method, the fire-resistant powder can be used for enabling the electrolyte permeating process to be changed to the protection layer forming process, the compound anti-corrosion ceramic protection sleeving tube is adopted, the practicality and the long-time stability of the compound anti-corrosion ceramic protection sleeving tube are greatly improved, and a general assembly scheme is simple and easy to implement.

Description

technical field [0001] The invention relates to an electrode guide rod protection method for isolating electrolyte melt corrosion, in particular to a protection method for an electrode guide rod of an aluminum electrolytic cell with an inert electrode. Background technique [0002] The use of inert electrode aluminum electrolysis technology is a fundamental way to solve the increasingly serious problems of carbon anode consumption and greenhouse gas emissions in today's aluminum industry. In the inert electrode aluminum electrolysis technology, the development of a vertical multi-chamber electrode structure aluminum electrolysis cell and the use of a low-temperature aluminum electrolysis system have more energy-saving and high-efficiency advantages. In the vertical aluminum electrolytic cell, the cathode and anode are arranged alternately, and the guide rod connecting the electrodes plays the dual role of conducting electricity and suspending the electrodes. According to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
CPCC25C3/12
Inventor 杨建红包生重梁贵生王俊伟李致远梁玉冬李晓星
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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