Pre-Compacted Graphite Plate for Aluminum Electrolysis Cathode Bottoms
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Solution Overview
Problem
Current cathode bottoms in aluminum electrolytic cells suffer from mechanical abrasion, chemical corrosion, and reduced effective cathode area due to the use of carbon or graphite ramming mass with tar, leading to increased wear and energy consumption.
Innovation Solution
A cathode bottom utilizing a pre-compacted graphite plate made from expanded graphite, which is electrically and thermally conductive, non-flammable, and chemically stable, is used to fill gaps between cathode blocks and side walls, increasing the effective cathode area and reducing wear by sealing and compensating for mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon or graphite ramming mass with tar is used to fill gaps between cathode blocks, then the gaps are sealed and mechanical stresses are compensated, but the effective cathode area is reduced and wear increases
Solution Approach 1:
The patent changes the material parameters by using expanded graphite instead of conventional carbon ramming mass with tar. This material substitution maintains the sealing and stress compensation functions while reducing the gap width to 1-10mm, thereby increasing the effective cathode area. The expanded graphite's unique properties (compressibility, chemical stability, electrical conductivity) enable it to fulfill the same functional requirements with smaller dimensional footprint.
2Reliability
If conventional carbon or graphite ramming mass with tar is used, then the gaps are sealed, but electrical and thermal conductivity are reduced leading to higher energy consumption
Solution Approach 1:
The patent employs expanded graphite as a composite material that combines sealing capability with high electrical and thermal conductivity. Unlike conventional carbon ramming mass with tar, expanded graphite maintains excellent conductivity properties while providing effective sealing, thereby reducing overall energy consumption in the electrolytic cell without compromising the sealing function.
3Reliability
If conventional tar-based carbon ramming mass is used, then the gaps are filled and sealed, but harmful polycyclic aromatic hydrocarbons are released
Solution Approach 1:
The patent extracts and removes the harmful tar component from the conventional carbon ramming mass formulation. By using pure expanded graphite without tar binders, the solution eliminates the source of polycyclic aromatic hydrocarbons while maintaining the sealing function through the inherent properties of expanded graphite material.
4Reliability
If thicker layers of ramming mass are used to ensure mechanical stability, then sealing is improved, but the cathode surface area is further reduced
Solution Approach 1:
The patent changes the mechanical parameters of the filling material by using expanded graphite with superior compressibility and structural stability. This allows the gap width to be reduced to 1-10mm while maintaining adequate mechanical stability and sealing performance, thereby maximizing the effective cathode surface area without compromising structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pre-compacted graphite plate enhances the cathode area, reduces wear, and improves electrical and thermal conductivity, leading to increased efficiency and reduced energy consumption while being environmentally friendly and safer than conventional materials.
Implementation Method 1
the pre-compacted graphite plate has a higher electrical and thermal conductivity compared to the conventional tar-pitch-containing carbon mass
Implementation Method 2
the pre-compacted graphite plate has a higher electrical and thermal conductivity compared to the conventional tar-pitch-containing carbon mass
Implementation Method 3
In the manufacturing process, the graphite can expand by a factor of 200 to 400 in volume, while maintaining thermal and electrical conductivity
Implementation Method 4
graphite is treated with an intercalation solution such as sulfuric acid to form an intercalate graphite compound (a graphite salt)
Implementation Method 5
a pre-compacted graphite plate is an expanded graphite in the form of a plate that is partially compressed and is therefore both pressed and pressable
Implementation Method 6
the material comprising the pre-compacted plate based on expanded graphite fills the joint and positively connects the cathode blocks
Data Source
AI summary
The present invention relates to a cathode bottom (1) for an electrolytic cell for producing aluminum, comprising a material (3), which can be arranged on at least one cathode block (7), characterized in that the material (3) comprises a pre-compressed plate based on expanded graphite. The present invention further relates to a method for producing a cathode bottom (1), comprising the following method steps: providing at least one cathode block (7), arranging a material (3) on at least one surface of the at least one cathode block (7), wherein the material (3) comprises at least one pre-compressed plate based on expanded graphite. The cathode bottom (1) is used in an electrolytic cell for producing aluminum.