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Lanthanum Oxalate (La₂(C₂O₄)₃·10H₂O) is a white crystalline powder celebrated for its role as a high-purity precursor in rare-earth processing and heterogeneous catalysis. With a CAS number of 537-03-1 and a molecular weight of 663.90 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.02 g/L at 25°C) and predictable thermal decomposition behavior. Its ability to selectively precipitate La³+ ions from mixed rare-earth solutions makes it a cornerstone in lanthanide separation technologies.
1. Selective Precipitation: Enables efficient separation of lanthanum from cerium, praseodymium, and neodymium in ore leachates, achieving purity boosts of 15-20% in single-stage processes.
2. Controlled Thermal Decomposition: Releases crystal water at 150-200°C and decomposes to La₂O₃ at 600-700°C, yielding a fine oxide powder with surface area up to 50 m²/g for catalytic applications.
3. Low Heavy Metal Content: Stringent purification ensures Fe, Pb, and Zn levels <5 ppm, meeting the strict requirements for use in pharmaceutical intermediates.
4. Flowable Particle Size: Uniform micron-scale particles (D50=10-15 μm) with low agglomeration, facilitating automated dosing in continuous manufacturing lines.
5. Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
• REE Separation Industry: Critical in the production of high-purity lanthanum oxide for glass polishing (e.g., LCD panels), where even trace impurities can cause optical defects.
• Catalyst Precursors: Converted to La₂O₃ for use in methanol synthesis catalysts, enhancing CO₂ hydrogenation activity through its basic surface sites.
• Ceramic Additives: Used as a sintering aid in zirconia ceramics, reducing densification temperature by 100°C while improving fracture toughness for dental implants.
• Research Reagents: Serves as a model compound in thermogravimetric analysis (TGA) and as a precursor for lanthanum-doped barium titanate (BLT) capacitors for high-frequency circuits.
• Environmental Remediation: Supports for activated carbon in water treatment, adsorbing phosphate ions to mitigate eutrophication in industrial wastewater.
Q: Why is oxalate preferred over chloride for lanthanum separation?
A: Oxalate precipitation offers higher selectivity and lower sodium contamination, critical for producing electronics-grade lanthanum compounds.
Q: What is the optimal calcination time for complete oxide conversion?
A: Heating at 700°C for 3 hours in air ensures >99% conversion to La₂O₃, with residual carbon content <0.1%.
Q: Can it be used in aqueous-based synthesis without calcination?
A: Yes, when dissolved in nitric acid, it provides a clear La³+ solution for sol-gel processes to produce nanoscale oxide particles.
Q: How does humidity affect storage stability?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth but does not impact chemical reactivity.
Q: Is this product compliant with FDA regulations for medical applications?
A: Yes, 4N-grade products undergo additional testing for biocompatibility, with heavy metal levels far below allowable limits (Pb <1 ppb).
Lanthanum Oxalate (La₂(C₂O₄)₃·10H₂O) is a white crystalline powder celebrated for its role as a high-purity precursor in rare-earth processing and heterogeneous catalysis. With a CAS number of 537-03-1 and a molecular weight of 663.90 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.02 g/L at 25°C) and predictable thermal decomposition behavior. Its ability to selectively precipitate La³+ ions from mixed rare-earth solutions makes it a cornerstone in lanthanide separation technologies.
1. Selective Precipitation: Enables efficient separation of lanthanum from cerium, praseodymium, and neodymium in ore leachates, achieving purity boosts of 15-20% in single-stage processes.
2. Controlled Thermal Decomposition: Releases crystal water at 150-200°C and decomposes to La₂O₃ at 600-700°C, yielding a fine oxide powder with surface area up to 50 m²/g for catalytic applications.
3. Low Heavy Metal Content: Stringent purification ensures Fe, Pb, and Zn levels <5 ppm, meeting the strict requirements for use in pharmaceutical intermediates.
4. Flowable Particle Size: Uniform micron-scale particles (D50=10-15 μm) with low agglomeration, facilitating automated dosing in continuous manufacturing lines.
5. Stable Hydration State: Maintains ten crystal water molecules under ambient conditions (25°C, 50% RH), ensuring consistent stoichiometry for precise material synthesis.
• REE Separation Industry: Critical in the production of high-purity lanthanum oxide for glass polishing (e.g., LCD panels), where even trace impurities can cause optical defects.
• Catalyst Precursors: Converted to La₂O₃ for use in methanol synthesis catalysts, enhancing CO₂ hydrogenation activity through its basic surface sites.
• Ceramic Additives: Used as a sintering aid in zirconia ceramics, reducing densification temperature by 100°C while improving fracture toughness for dental implants.
• Research Reagents: Serves as a model compound in thermogravimetric analysis (TGA) and as a precursor for lanthanum-doped barium titanate (BLT) capacitors for high-frequency circuits.
• Environmental Remediation: Supports for activated carbon in water treatment, adsorbing phosphate ions to mitigate eutrophication in industrial wastewater.
Q: Why is oxalate preferred over chloride for lanthanum separation?
A: Oxalate precipitation offers higher selectivity and lower sodium contamination, critical for producing electronics-grade lanthanum compounds.
Q: What is the optimal calcination time for complete oxide conversion?
A: Heating at 700°C for 3 hours in air ensures >99% conversion to La₂O₃, with residual carbon content <0.1%.
Q: Can it be used in aqueous-based synthesis without calcination?
A: Yes, when dissolved in nitric acid, it provides a clear La³+ solution for sol-gel processes to produce nanoscale oxide particles.
Q: How does humidity affect storage stability?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth but does not impact chemical reactivity.
Q: Is this product compliant with FDA regulations for medical applications?
A: Yes, 4N-grade products undergo additional testing for biocompatibility, with heavy metal levels far below allowable limits (Pb <1 ppb).
