Low Chloride Cerium Carbonate

Rare Earth Carbonates

Low Chloride Cerium Carbonate, chemically represented as Ce₂(CO₃)₃ (primarily cerium(III) carbonate, the stable trivalent form), is a specialized variant of cerium carbonate defined by its ultra-low chloride ion (Cl⁻) content—typically ≤10 ppm, and often as low as 1–5 ppm for high-sensitivity applications. Unlike standard cerium carbonate (which may contain 50–100 ppm chloride from raw materials or synthesis processes), this variant undergoes targeted purification to minimize chloride, as even trace chloride can cause corrosion, device failure, or performance degradation in chloride-sensitive fields such as electronics, medical ceramics, and high-temperature energy storage. Complemented by high base purity (≥99.9% for industrial use, ≥99.99% for high-tech applications), it retains cerium(III)’s inherent stability (+3 oxidation state) and low aqueous solubility, making it a critical material for processes where chloride contamination is intolerable.

Commercially, Low Chloride Cerium Carbonate is categorized by chloride level and base purity to match application sensitivity. The Industrial Low-Chloride Grade (chloride ≤10 ppm, base purity ≥99.9%) is used in general chloride-sensitive industrial processes, such as ceramic glazes for medical implants (where chloride could leach and cause tissue irritation) and intermediate-temperature fuel cell components. The High-Purity Low-Chloride Grade (chloride ≤5 ppm, base purity ≥99.99%) targets electronics and optoelectronics, including thin-film deposition precursors and semiconductor dielectric materials—where chloride-induced corrosion of metal layers or dielectric breakdown is a major risk. The Ultra-Low-Chloride Grade (chloride ≤1 ppm, base purity ≥99.999%) is a niche grade for biomedical devices (e.g., cerium-doped bioceramics) and nuclear energy materials, requiring near-absence of chloride to ensure biocompatibility or radiation resistance. At standard temperature and pressure, Low Chloride Cerium Carbonate exists as a white to pale yellow crystalline powder or dense granules (100–500 mesh for powders, 1–3 mm for granules)—its uniform color and lack of chloride-related discoloration (e.g., yellowish tints from iron chloride impurities) are key visual cues of its low-chloride quality, aiding in rapid quality screening.

Physically, Low Chloride Cerium Carbonate exhibits traits optimized for chloride-sensitive applications. It has a molecular weight of 460.25 g/mol (identical to standard cerium carbonate) and bulk densities consistent with particle size: 2.5–2.7 g/cm³ for fine powders (100–500 mesh) and 3.0–3.2 g/cm³ for granules, ensuring compatibility with standard processing equipment. A defining physical property is its minimal chloride leaching: when immersed in deionized water (18 MΩ·cm) for 24 hours, chloride release is ≤0.5 ppm—far lower than standard cerium carbonate (5–10 ppm leaching), critical for applications like biomedical ceramics where leached ions could affect biological environments. Its solubility in strong acids (e.g., nitric acid) remains high (≥99.8% dissolution efficiency), but without chloride-induced side reactions (e.g., formation of toxic chlorine gas when mixed with oxidizing acids). Thermal stability is also enhanced: it decomposes uniformly at 300–400°C to form low-chloride cerium(III) oxide (Ce₂O₃, chloride ≤2 ppm) and carbon dioxide (CO₂), with no chloride-related decomposition anomalies (e.g., formation of cerium oxychloride (CeOCl) which occurs with higher chloride levels). Fine-powder grades have low hygroscopicity (<0.1% moisture absorption at 60% humidity), preventing chloride redistribution via moisture.

Chemically, Low Chloride Cerium Carbonate retains cerium(III) carbonate’s core reactivity but with chloride-free performance. It is stable in air and inert to anhydrous organic solvents (e.g., ethanol, acetonitrile), with reactivity limited to strong acids and high temperatures. When reacted with high-purity nitric acid (used in electronics), it undergoes complete, chloride-free reaction (Ce₂(CO₃)₃ + 6HNO₃ → 2Ce(NO₃)₃ + 3CO₂↑ + 3H₂O) without forming chloride byproducts (e.g., HCl gas), which could corrode process equipment or contaminate products. Unlike standard cerium carbonate, it is free of chloride-induced redox interference: chloride ions (which act as mild reducing agents) are absent, ensuring consistent oxidation of Ce³⁺ to Ce⁴⁺ in high-temperature processes (e.g., thin-film annealing). It also exhibits enhanced compatibility with metal substrates (e.g., aluminum, copper in electronics): low chloride levels prevent galvanic corrosion at metal-ceramic interfaces, extending device lifespan.

The industrial production of Low Chloride Cerium Carbonate builds on standard cerium carbonate synthesis but adds targeted chloride removal steps, with strict control of chloride inputs. The process involves five core steps. First, chloride-free raw material selection: high-purity cerium(III) oxide (Ce₂O₃, chloride ≤2 ppm, base purity ≥99.99%) is used, avoiding chloride-containing raw materials (e.g., cerium chloride). Second, acid dissolution with chloride control: Ce₂O₃ is dissolved in ultra-pure nitric acid (chloride ≤0.5 ppm) instead of hydrochloric acid, at 80–100°C (molar ratio Ce₂O₃:HNO₃ = 1:6), forming a chloride-free cerium(III) nitrate solution. Third, chloride-specific purification: if trace chloride is detected (<5 ppm), the solution is treated with silver nitrate (AgNO₃, chloride ≤0.1 ppm) to precipitate silver chloride (AgCl), which is removed via ultra-filtration (0.01 μm membranes). For ultra-low-chloride grades, an additional ion exchange step (using chloride-selective resins) reduces chloride to ≤1 ppm. Fourth, precipitation with chloride-free reagents: ultra-pure ammonium carbonate ((NH₄)₂CO₃, chloride ≤0.5 ppm) is added to the cerium(III) nitrate solution at 20–30°C (pH 7.0–7.5) under nitrogen (to prevent oxidation), forming Ce₂(CO₃)₃ precipitates. The precipitates are washed repeatedly with chloride-free deionized water (≤0.1 ppm Cl⁻) until rinse water chloride is ≤0.5 ppm. Fifth, drying and finishing: wet precipitates are dried in a chloride-free cleanroom (Class 100) at 80–120°C under vacuum (using chloride-free vacuum oil), then crushed and screened to target particle size. Granules are formed via binder-free high-pressure compaction (binders may introduce chloride) and annealed at 200°C to enhance stability.

Low Chloride Cerium Carbonate’s applications focus on chloride-sensitive fields where even trace chloride is problematic. In electronics, High-Purity Low-Chloride Grade (≤5 ppm Cl⁻) is a precursor for cerium-based dielectric films (e.g., CeO₂) in semiconductors: chloride-free decomposition ensures no corrosion of underlying metal layers (e.g., copper interconnects) and low dielectric leakage current. In biomedical engineering, Ultra-Low-Chloride Grade (≤1 ppm Cl⁻) is used in cerium-doped bioceramics (e.g., alumina-cerium composites) for bone implants: low chloride prevents leaching-induced inflammation and ensures biocompatibility with human tissue. In high-temperature energy storage (e.g., solid oxide fuel cells), Industrial Low-Chloride Grade (≤10 ppm Cl⁻) is a component of electrolyte materials: chloride-free composition avoids degradation of electrolyte conductivity at 600–800°C (chloride ions block oxygen ion transport). In optical coatings, High-Purity Grade is used as a dopant for anti-reflective coatings: low chloride prevents coating delamination (caused by chloride-induced corrosion of substrate metals). Additionally, it is used in laboratory research for chloride-sensitive experiments (e.g., studying cerium ion behavior in biological systems) and as a reference material for chloride analysis in rare earth compounds.

Safety-wise, Low Chloride Cerium Carbonate poses minimal risks, with additional benefits from low chloride. Fine-powder grades may generate minor dust (controlled via particle size), so operators should wear nitrile gloves, safety goggles, and low-linting lab coats—chloride-free PPE (avoiding chloride-treated fabrics) is recommended to prevent cross-contamination. Granular grades eliminate dust risks but require protection against mild skin/eye irritation from Ce³⁺ ions. Storage must be in chloride-free, airtight containers (e.g., Teflon-lined polyethylene, avoiding PVC which may leach chloride) in a humidity-controlled environment (15–25°C,<50% humidity) to prevent moisture absorption and chloride redistribution. Unlike standard cerium carbonate, it should not be stored near chloride-containing chemicals (e.g., NaCl, HCl) to avoid cross-contamination. In case of skin contact, rinse with chloride-free water for 15 minutes; eye contact requires flushing with chloride-free water and medical attention if irritation persists. When stored properly, Industrial Grade has a shelf life of 2–3 years, High-Purity Grade 1.5–2 years, and Ultra-Low-Chloride Grade 1–1.5 years (more sensitive to chloride pickup). Expired products are identified by increased chloride levels (detected via ion chromatography) or reduced performance in chloride-sensitive tests.

Descriptive:  WNX employs advanced automated production technology and uses high-quality raw materials to produce high-qualityLow Chloride Cerium Carbonate.

Key Features:

High Purity:Low Chloride Cerium Carbonate contains no impurities from rare earth elements (such as iron, calcium, sodium), and the impurity content is low.

Good Solubility:Low Chloride Cerium Carbonate can dissolve rapidly in water and strong acids.

Consistency: The strict batch management in the production ofLow Chloride Cerium Carbonate ensures stable quality for industrial large-scale production.

Pharmaceuticals and Chemical Reagents: The impurity content of low-chlorine cerium carbonate is very low, and its chemical purity is extremely high. It is highly suitable for use as a pharmaceutical intermediate and analytical pure chemical reagent, especially in biochemical and pharmaceutical research where high purity cerium sources are required.

High-end catalyst manufacturing: Due to its extremely low chloride ion content, it can effectively prevent catalyst poisoning. It is an ideal precursor material for manufacturing automotive exhaust purification three-way catalysts and fluid catalytic cracking (FCC) catalysts used in petrochemicals.

Electronic Ceramics and Functional Materials: The low chlorine property of these materials gives them an advantage in the production of electronic ceramics (such as multilayer ceramic capacitors MLCC), rare earth luminescent materials, and hard alloy additives, significantly enhancing the insulation performance and reliability of the final products.

Water treatment and phosphorus removal: Due to its chemical properties, cerium carbonate can effectively remove phosphate from water bodies through precipitation. The low-chlorine formulation avoids secondary chloride contamination and provides a more environmentally friendly solution to the problem of water eutrophication.

1.Neutral labels/packaging (jumbo bag of 1.000kg each net),Two bags per pallet.

2.Vacuum-sealed, then wrapped in air cushion bags, and finally packed into iron drums.

Drum: Steel drums (open-top, 45L capacity, dimensions: φ365mm × 460mm / inner diameter × outer height).

Weight per Drum: 50 kg

Palletization: 18 drums per pallet (total 900 kg/pallet).

Transport Class: Maritime transportation / Air transportation

Custom packaging available upon request