Sodium-free refining agent is a treatment aid specifically designed for the purification of aluminum and aluminum alloy melts. Its core feature is that it is completely free of sodium. The recommended addition amount is 0.1%-0.4% of the weight of the aluminum alloy charge, but companies can adjust this flexibly based on the actual melt conditions and process requirements. The operating temperature must reach 700-740℃ and above; within this range, the refining effect is stable. The product is supplied in bags, available in 1 kg/bag, 2.5 kg/bag, and 5 kg/bag sizes, facilitating charging operations and inventory management for smelting furnaces of different sizes. Its sodium-free formula makes it particularly suitable for high-end aluminum alloys sensitive to sodium content, balancing refining efficiency and material safety.
Main Advantages
Sodium-free formula, avoiding sodium embrittlement risk: The product contains no sodium, fundamentally eliminating the increased embrittlement caused by sodium segregation at aluminum alloy grain boundaries. It is particularly suitable for aluminum alloys requiring high plasticity and toughness (such as aluminum-magnesium-silicon alloys and aluminum-magnesium alloys) and workpieces requiring subsequent anodizing treatment.
Wide addition range and high operational flexibility: An addition ratio of 0.1%-0.4% can be used as the standard refining dosage, or adjusted temporarily according to the actual impurity content in the molten aluminum. Technicians can handle batch-to-batch melt quality variations without frequently changing the refining agent type.
Suitable for mainstream melting temperatures: Temperatures of 700-740℃ and above cover the actual operating window for most aluminum alloy melting, holding, and refining processes. There is no need to deliberately change the existing furnace temperature regime to use this product; it can be directly integrated into the existing production rhythm.
Diverse packaging specifications and convenient feeding: Three small bag packaging options are available for single or multiple feeding needs in small-batch trials (1kg), medium-sized furnaces (2.5kg), and large furnaces (5kg). The bags can be directly added to the furnace or blown out after opening, reducing scattering losses and weighing errors.
Highly versatile and compatible with various processes: It can be used with a powder sprayer to inject powder into molten aluminum as a carrier gas, or manually added with stirring when no powder spraying equipment is available, adapting to aluminum alloy production workshops with varying equipment levels.
Product Applications
Sodium-free refining agent is primarily used in the refining and purification process of molten aluminum alloys. In practical applications, when the temperature of the molten aluminum rises to above 700-740℃, operators add a sodium-free refining agent to the furnace at a ratio of 0.1%-0.4% (this can be achieved by dispersing the agent with a powder sprayer or manually sprinkling it onto the surface of the melt and pressing it below the liquid surface). At high temperatures, the product rapidly reacts with or physically adsorbs hydrogen and non-metallic inclusions (such as alumina film, carbides, etc.) in the molten aluminum, causing these impurities to aggregate and float to the surface of the melt, forming easily removable dry scum. Because the formula does not contain sodium, the refining process does not introduce additional sodium ions into the molten aluminum, thus avoiding the negative impact of sodium on the mechanical properties (such as elongation and impact resistance) and corrosion resistance of aluminum alloys. This product is widely applicable to the pre-smelting and refining processes of aluminum processing products with strict sodium content restrictions, such as cast aluminum alloys (e.g., wheel hubs, engine parts), wrought aluminum alloys (e.g., extruded profiles, plates, bars), and high-purity aluminum foil and can stock. Simultaneously, for smelting enterprises using recycled aluminum as raw material, the sodium-free refining agent can remove impurities while preventing sodium accumulation, thus improving the quality stability of recycled aluminum products. Each bag of product is packaged by weight, facilitating direct calculation of usage by furnace batch by shift personnel, reducing on-site weighing steps, and improving production efficiency.
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