Purity testing is a core component of quality control for sodium fluoroaluminate, directly determining whether the material meets industrial production standards. Testing focuses primarily on the content of the active ingredient-sodium hexafluoroaluminate-while screening for harmful impurities such as iron, silicon, moisture, and sulfates; product grades are strictly classified according to national industrial standards. Professional methods, including chemical titration and spectroscopic analysis, are employed to precisely measure the ratios of the three key elements-fluorine, aluminum, and sodium-ensuring balanced elemental proportions and compliance with active ingredient specifications. Impurity testing places particular emphasis on iron ion and silicon dioxide levels; excessive amounts of these impurities can directly cause quality issues such as reduced current efficiency in aluminum electrolysis or discoloration (yellowing or darkening) in glass glazes. Consequently, purity spot checks are mandatory for every batch to prevent substandard products from entering the production process.
Physical property testing is fundamental to ensuring the stability of sodium fluoroaluminate during use, covering parameters such as fineness, moisture content, physical appearance, and flowability. For the two primary product forms-powder and granules-standard sieving equipment is used to assess mesh size and particle size uniformity, screening for anomalies such as coarse or agglomerated particles. Moisture content is strictly monitored to prevent issues caused by excessive moisture, such as splashing during high-temperature operations or uneven melting. Visual inspections, combining manual checks with equipment analysis, ensure that qualified products exhibit uniform color without discoloration, clumping, or mold; the powder must also demonstrate good flowability to meet the feeding requirements of automated production lines, thereby ensuring a smooth and stable manufacturing process.
High-temperature performance testing evaluates the material's practical industrial utility by simulating actual production conditions to verify its fluxing and stability characteristics. Key tests focus on melting temperature, high-temperature stability, melt flowability, and electrical conductivity, assessing whether the material decomposes or fails in high-temperature environments or generates excessive waste residue. High-temperature smelting trials are conducted to observe the material's fluxing effect and the clarity of the melt, determining whether its fluxing capability meets the process requirements for aluminum electrolysis and ceramic glaze production. Simultaneously, the loss on ignition at high temperatures is measured to monitor material loss and impurity precipitation under high-temperature operating conditions; this comprehensively verifies the industrial suitability of sodium fluoroaluminate, ensuring stable and reliable performance during continuous, high-intensity industrial production.
