Fluorite lump 90% CaF2 for AOD furnace

Product Name: Metallurgical Grade Fluorite Lump 90% CaF₂

Origin: Mongolia (Own Mine)

Form: Lump Ore (custom screening available)

Applications: Steel & stainless steel flux, ferroalloy refining flux, welding flux raw material, refractory sintering additive

With CaF₂ content consistently above 91%, SiO₂ below 8.5%, and extremely low S/P/Pb impurities, this product meets the strict requirements of high-end metallurgical consumers. As a flux, fluorite effectively lowers slag melting point and viscosity, accelerates lime dissolution, enhances desulfurization and dephosphorization, and improves slag-metal separation — making it an indispensable consumable in AOD stainless steel refining and silicothermic ferroalloy production.

FAQ:What is the Application of Fluorspar in AOD (Argon Oxygen Decarburization) Furnaces?

Core Functional Mechanisms

1)Fluxing and Viscosity Reduction: Fluorspar (CaF₂) significantly disrupts the structural network formed by high-melting-point lime (CaO). This substantially lowers the melting point and viscosity of the slag, ensuring that high-basicity refining slag melts rapidly and maintains excellent fluidity at AOD refining temperatures.

2)Enhanced Reaction Kinetics: The improved fluidity at the slag-metal interface accelerates the mass transfer of sulfur and phosphorus into the slag phase, thereby boosting desulfurization efficiency. It also facilitates the reduction and recovery of chromium oxide (Cr₂O₃) in the slag during the reduction period, minimizing chromium loss.

3)Refractory Protection and Energy Efficiency: Appropriate fluorspar addition prevents the need to excessively raise temperatures or increase lime consumption merely to achieve slag fluidity. This indirectly mitigates thermal erosion of the furnace refractories and shortens the smelting cycle.

Specific Application Characteristics in AOD Processes

1)Addition Timing: It is typically added alongside lime during the initial stage of blowing (the decarburization period) to rapidly form a fluid slag layer. It is also utilized during the reduction period to adjust slag conditions and optimize chromium recovery.

2)Dosage Control: The typical dosage ranges from 1% to 2% of the molten steel weight. Strict control is required to prevent excessive refractory erosion or fluoride emissions. Modern metallurgical practices favor the use of low-silica, high-purity fluorspar briquettes to minimize impurity introduction and reduce overall consumption by 20%–30% compared to conventional lump fluorspar.

3)Slag System Compatibility: Fluorspar is commonly used in conjunction with CaO and Al₂O₃ to form a basic refining slag system (e.g., CaO-SiO₂-Al₂O₃-CaF₂). Adjusting the CaF₂ ratio is crucial to balance the rate of slag formation with the operational lifespan of the slag.