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What are the advantages of sodium fluoroaluminate
info：www.hongjiafu.net | Release time：2026-06-16
Sodium fluoroaluminate (Na3-AlF ₆) is a flux that can be scaled up as a substitute for and adapted to electrolytic aluminum. It also has irreplaceable comprehensive performance advantages in industries such as abrasives, enamel, welding materials, and glass. It can be divided into four categories: basic physical and chemical advantages, electrolytic aluminum specific advantages, other industry application advantages, and production and use cost advantages
1、 Basic physical and chemical core advantages (universal performance)
1. Solubility of alumina
At 950~970 ℃, the molten state can stably dissolve about 10% alumina, making it one of the few fluorides that can dissociate a large amount of Al ₂ O3 to form an ionic melt, achieving the ionization electrolysis reaction of alumina.
2. Low melting point, significantly reducing high temperature energy consumption
Pure alumina has a melting point of 2050 ℃, and when combined with cryolite eutectic, it can melt at only around 950 ℃ without the need for high temperature heating, significantly reducing power and fuel consumption.
3. Excellent conductivity in molten state
Melt ionizes a large amount of Na ⁺ and [AlF ₆] ³ ⁻, resulting in low electrolyte resistivity, low voltage drop in the electrolytic cell, high current efficiency, and reduced power loss.
4. Density layered isolation to prevent secondary oxidation of aluminum
The density of molten electrolyte is slightly lower than that of liquid aluminum. The aluminum liquid settles at the bottom of the tank, while the electrolyte floats on the upper layer to isolate the air and avoid oxidation and burning of high-temperature aluminum liquid. The aluminum recovery rate exceeds 95%.
5. Good high-temperature chemical stability
Complete melting occurs at 1009 ℃, and it is not easily volatilized or decomposed under electrolysis conditions; The molecular ratio can be freely adjusted (2.0~3.0) to adapt to different groove processes.
6. Almost insoluble metal aluminum
The molten system has low solubility for liquid aluminum, and the produced aluminum liquid will not dissolve back into the electrolyte, thereby improving the metal yield and reducing raw material loss.
7. Impurities are controllable to ensure the purity of the finished product
High purity cryolite does not contain high potential metal impurities such as copper, iron, and silicon. Electrolysis does not prematurely precipitate contaminated aluminum liquid, making it suitable for producing high-purity primary aluminum and electrical aluminum.
2、 Exclusive advantages of electrolytic aluminum industry
1. The electrolytic cell has strong thermal stability
High specific heat capacity, buffering furnace temperature fluctuations, smooth temperature changes during start-up and shutdown, electrolyte is not easy to rapidly shrink or crust, extending the life of the electrolytic cell lining.
2. Low volatilization loss, reducing fluorine consumption
Compared to the single aluminum fluoride and sodium fluoride composite system, the high-temperature volatilization of cryolite is smaller, and the recycling rate of fluorinated materials exceeds 80%, reducing the amount of fluoride salt added.
3. Compatible with new and old electrolytic cells, easy to control the process
When using the new start-up tank, the electrolyte composition is stable and the molecular ratio fluctuation is small; Can be paired with CaF ₂ and AlF ∝ to fine tune the initial crystallization temperature and flowability, suitable for large pre baked cells and small self baked cells.
4. Multiple forms of powder/sand/granular materials are available for selection
Sand like cryolite has good fluidity and less dust, suitable for automated closed feeding; Granular products have no dust, improve workshop environment, and facilitate assembly line transportation.
5. Simplify the raw material ratio to save soda ash and sodium fluoride
It can be used alone to form a basic electrolyte without the need for a large amount of complex sodium fluoride, greatly reducing the cost of auxiliary material procurement and ingredient labor.
1、 Basic physical and chemical core advantages (universal performance)
1. Solubility of alumina
At 950~970 ℃, the molten state can stably dissolve about 10% alumina, making it one of the few fluorides that can dissociate a large amount of Al ₂ O3 to form an ionic melt, achieving the ionization electrolysis reaction of alumina.
2. Low melting point, significantly reducing high temperature energy consumption
Pure alumina has a melting point of 2050 ℃, and when combined with cryolite eutectic, it can melt at only around 950 ℃ without the need for high temperature heating, significantly reducing power and fuel consumption.
3. Excellent conductivity in molten state
Melt ionizes a large amount of Na ⁺ and [AlF ₆] ³ ⁻, resulting in low electrolyte resistivity, low voltage drop in the electrolytic cell, high current efficiency, and reduced power loss.
4. Density layered isolation to prevent secondary oxidation of aluminum
The density of molten electrolyte is slightly lower than that of liquid aluminum. The aluminum liquid settles at the bottom of the tank, while the electrolyte floats on the upper layer to isolate the air and avoid oxidation and burning of high-temperature aluminum liquid. The aluminum recovery rate exceeds 95%.
5. Good high-temperature chemical stability
Complete melting occurs at 1009 ℃, and it is not easily volatilized or decomposed under electrolysis conditions; The molecular ratio can be freely adjusted (2.0~3.0) to adapt to different groove processes.
6. Almost insoluble metal aluminum
The molten system has low solubility for liquid aluminum, and the produced aluminum liquid will not dissolve back into the electrolyte, thereby improving the metal yield and reducing raw material loss.
7. Impurities are controllable to ensure the purity of the finished product
High purity cryolite does not contain high potential metal impurities such as copper, iron, and silicon. Electrolysis does not prematurely precipitate contaminated aluminum liquid, making it suitable for producing high-purity primary aluminum and electrical aluminum.
2、 Exclusive advantages of electrolytic aluminum industry
1. The electrolytic cell has strong thermal stability
High specific heat capacity, buffering furnace temperature fluctuations, smooth temperature changes during start-up and shutdown, electrolyte is not easy to rapidly shrink or crust, extending the life of the electrolytic cell lining.
2. Low volatilization loss, reducing fluorine consumption
Compared to the single aluminum fluoride and sodium fluoride composite system, the high-temperature volatilization of cryolite is smaller, and the recycling rate of fluorinated materials exceeds 80%, reducing the amount of fluoride salt added.
3. Compatible with new and old electrolytic cells, easy to control the process
When using the new start-up tank, the electrolyte composition is stable and the molecular ratio fluctuation is small; Can be paired with CaF ₂ and AlF ∝ to fine tune the initial crystallization temperature and flowability, suitable for large pre baked cells and small self baked cells.
4. Multiple forms of powder/sand/granular materials are available for selection
Sand like cryolite has good fluidity and less dust, suitable for automated closed feeding; Granular products have no dust, improve workshop environment, and facilitate assembly line transportation.
5. Simplify the raw material ratio to save soda ash and sodium fluoride
It can be used alone to form a basic electrolyte without the need for a large amount of complex sodium fluoride, greatly reducing the cost of auxiliary material procurement and ingredient labor.
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