Cerous Sulfate

Rare Earth Sulfates

Cerous Sulfate, chemically represented as Ce₂(SO₄)₃ (primarily existing in hydrated forms such as the pentahydrate (Ce₂(SO₄)₃·5H₂O) or octahydrate (Ce₂(SO₄)₃·8H₂O) under ambient conditions), is a key inorganic compound in the cerium(III) salt family. Distinguished by its stable cerium(III) oxidation state (+3)—a trait that sets it apart from ceric sulfate (Ce(SO₄)₂, cerium(IV)) which exhibits strong oxidizing properties—Cerous Sulfate balances moderate aqueous solubility with excellent chemical stability. Unlike highly soluble cerium salts like cerium nitrate or chloride, its lower solubility enables controlled release of Ce³⁺ ions, making it ideal for applications such as water treatment, catalyst precursors, and ceramic synthesis. With base purities ranging from 95% (technical grade) to 99.999% (ultra-high purity), it is widely used across industrial, laboratory, and high-tech fields where mild reactivity and stability are prioritized.

Commercially, Cerous Sulfate is categorized by hydration state, purity, and particle size to meet diverse application needs. Technical Grade (purity 95.0%–99.0%, typically pentahydrate or octahydrate, particle size 100–200 mesh) prioritizes cost-efficiency for industrial uses like ceramic sintering aids, textile mordants, and raw material for cerium oxide synthesis. Reagent Grade (purity ≥99.0%, controlled hydration ±0.5%, particle size 200–300 mesh) meets laboratory standards for analytical chemistry, lanthanide coordination studies, and small-scale wet chemical synthesis. High-Purity Grade (purity ≥99.99%, low-hydrate forms like dihydrate (Ce₂(SO₄)₃・2H₂O), particle size 200–300 mesh) targets electronics and optics, including precursors for cerium-based thin films and dopants for specialty glasses—where trace impurities (e.g.,<10 ppb heavy metals, <5 ppb other rare earths) must be minimized to avoid performance defects. Ultra-High Purity Grade (purity ≥99.999%, monohydrate or anhydrous) is a niche grade for semiconductor and quantum dot applications, with hydration tightly controlled (<0.1% variation) to prevent moisture-induced defects. At standard temperature and pressure, Cerous Sulfate hydrates appear as colorless to pale blue crystalline powders or needle-like crystals—its light color and lack of strong oxidizing properties simplify handling, while hydration state is distinguishable via thermal gravimetric analysis (TGA): pentahydrate loses most 结晶 water at 80–120°C, forming anhydrous Ce₂(SO₄)₃ above 250°C.

Physically, Cerous Sulfate exhibits traits tailored to its hydration state and application requirements. The pentahydrate (Ce₂(SO₄)₃·5H₂O) has a molecular weight of 634.55 g/mol, a bulk density of ~1.85 g/cm³, and moderate aqueous solubility (~2.3 g/100 mL at 20°C)—lower than cerium nitrate (120 g/100 mL) or chloride (97 g/100 mL), enabling controlled Ce³⁺ release in water treatment. The octahydrate (Ce₂(SO₄)₃·8H₂O) has a molecular weight of 688.59 g/mol, similar bulk density, and slightly higher solubility (~2.8 g/100 mL at 20°C), suited for fertilizer formulations requiring gradual nutrient release. Anhydrous Cerous Sulfate (molecular weight 568.42 g/mol) has a higher bulk density (~2.80 g/cm³) and very low solubility (~0.1 g/100 mL at 20°C), but hydrated forms are preferred for most applications due to better processability. Thermal stability varies with hydration: lower hydrates (monohydrate, dihydrate) decompose at 200–300°C, while higher hydrates (pentahydrate, octahydrate) lose water in stages, with complete decomposition to cerium(III) oxide (Ce₂O₃) above 800°C (via intermediate cerium oxysulfate, Ce₂O₂SO₄). All hydrated forms have low hygroscopicity (<0.3% moisture absorption at 60% humidity), preventing caking and simplifying storage compared to more hygroscopic cerium salts.

Chemically, Cerous Sulfate is defined by its stability and mild reactivity, attributed to the Ce³⁺ oxidation state. As a lanthanide (III) sulfate, it dissociates partially in aqueous solutions (due to low solubility) into Ce³⁺ and SO₄²⁻ ions, with dissociation increasing with temperature. It reacts with strong bases (e.g., sodium hydroxide) to form insoluble cerium (III) hydroxide (Ce (OH)₃) precipitates (Ce₂(SO₄)₃ + 6NaOH → 2Ce (OH)₃↓ + 3Na₂SO₄), a reaction used in analytical chemistry to isolate cerium from sulfate-rich solutions. With carbonate salts (e.g., ammonium carbonate), it forms insoluble cerium (III) carbonate (Ce₂(CO₃)₃)—a key intermediate in high-purity cerium oxide synthesis. Unlike ceric sulfate (Ce (SO₄)₂), it is not a strong oxidizer and exhibits no redox reactivity under normal conditions, making it safe for use in fertilizer, textile, and food contact applications (e.g., animal feed additives). When heated, it undergoes thermal decomposition: first losing 结晶 water, then converting to cerium oxysulfate (Ce₂O₂SO₄) at 500–600°C, and finally to Ce₂O₃ at >800°C—this pathway is widely used to produce high-purity cerium oxide for electronics and catalysis.

The industrial production of Cerous Sulfate primarily uses cerium-rich raw materials, such as purified cerium(III) oxide (Ce₂O₃) or cerium(III) chloride, via acid dissolution or precipitation. The process involves four core steps. First, raw material preparation: if using Ce₂O₃ (purity ≥99.0%), it is crushed to 100–200 mesh and dissolved in dilute sulfuric acid (H₂SO₄, 20%–30% concentration) at 60–80°C, with a molar ratio of Ce₂O₃ to H₂SO₄ of 1:3 (reaction: Ce₂O₃ + 3H₂SO₄ + nH₂O → Ce₂(SO₄)₃·nH₂O + 3H₂O). If using cerium(III) chloride, a solution of ammonium sulfate ((NH₄)₂SO₄) is added to induce precipitation of Cerous Sulfate, ensuring complete conversion of Ce³⁺ to the sulfate salt. Second, purification: the resulting solution or suspension is filtered to remove undissolved impurities (e.g., silica, other Rare Earth Sulfates). For high-purity grades, solvent extraction or ion exchange is used to reduce trace metals (e.g., Fe, Cu) and anions (e.g., Cl⁻, NO₃⁻) to ppb levels. Third, crystallization: the purified solution is concentrated under reduced pressure at 50–70°C to a 40%–50% concentration, then cooled to 0–10°C to crystallize the desired hydrate (e.g., pentahydrate at 5–8°C, octahydrate at 8–12°C). The crystals are filtered and washed with cold deionized water to remove residual sulfate and impurities. Fourth, drying and finishing: the wet crystals are dried at 40–60°C (for higher hydrates) or 80–100°C (for lower hydrates) to control hydration, then crushed and screened to target particle size. High-purity grades are dried under vacuum to avoid atmospheric contamination, then packaged in moisture-proof containers to maintain hydration stability.

Cerous Sulfate’s applications span industries, driven by its controlled solubility and stable Ce³⁺ state. In water treatment, Technical Grade pentahydrate is used as a phosphate remover: Ce³⁺ ions react with PO₄³⁻ to form insoluble cerium phosphate (CePO₄), which settles out to prevent eutrophication in lakes and wastewater systems—its low solubility ensures gradual Ce³⁺ release, avoiding sudden pH fluctuations. In materials synthesis, it is a precursor for high-purity cerium oxide: thermal decomposition produces Ce₂O₃ or CeO₂ (via oxidation of Ce₂O₃) used in solid oxide fuel cells (electrolytes) and automotive exhaust catalysts. In agriculture, Reagent Grade octahydrate is added to fertilizers as a micronutrient: trace Ce³⁺ promotes plant root growth and enhances resistance to drought and pests, with low solubility preventing leaching into groundwater. In optics, High-Purity Grade low-hydrates are doped into specialty glasses to improve UV absorption and refractive index, used in high-precision lenses and optical fibers for aerospace applications. In laboratory settings, Reagent Grade is used for analytical chemistry (e.g., masking agent for heavy metals in sulfate ion determination) and lanthanide chemistry research, serving as a model compound for studying Ce³⁺ coordination behavior. Additionally, it is used in ceramic manufacturing as a sintering aid, lowering the sintering temperature of zirconia ceramics by 150–200°C and improving mechanical strength and thermal shock resistance.

Safety-wise, Cerous Sulfate has low acute toxicity and is considered safe for most industrial and laboratory uses. Its crystals or solutions cause minimal skin or eye irritation—direct contact may result in mild dryness, but no chemical burns (unlike ceric sulfate, which can cause oxidative burns). Inhalation of fine powder may irritate the respiratory tract, leading to temporary coughing, so dust generation should be minimized via proper handling (e.g., using low-linting gloves). It is non-flammable, and thermal decomposition releases only water vapor and non-toxic sulfur oxides (at high temperatures), posing no fire or explosion risks. To ensure safety, operators should wear nitrile gloves and safety goggles when handling; a dust mask is recommended for fine-powder grades. Storage should be in a cool (15–25°C), dry (<60% area="" in="" sealed="" containers="" to="" maintain="" higher="" hydrates="" should="" be="" protected="" from="" excessive="" heat="">40°C) to prevent water loss, while lower hydrates are more heat-tolerant. It should be stored separately from strong bases to avoid unwanted precipitation of Ce(OH)₃. In case of skin contact, rinse with water for 10 minutes; eye contact requires flushing with water. If inhaled, move to fresh air. When stored properly, higher hydrates have a shelf life of 1–2 years, lower hydrates 2–3 years. Expired products may show reduced solubility or hydration deviation (detected via TGA) and should be tested before use.

Descriptive:  WNX employs advanced automated production technology and uses high-quality raw materials to produce high-qualityCerous Sulfate.

Key Features:

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

Good Solubility:Cerous Sulfate can dissolve rapidly in water and strong acids.

Consistency: The strict batch management in the production ofCerous Sulfate ensures stable quality for industrial large-scale production.

Chemical industry catalyst: Cerium sulfate is mainly used as a color developer in the chemical industry, especially as a color developer for aniline black in textile dyeing, which can effectively enhance the dyeing effect. It can also be used as a catalyst or catalyst precursor in certain organic synthesis reactions.

Pond Phosphorus Remover: Due to its chemical properties, cerium sulfate can effectively remove phosphate from water bodies through precipitation, which is helpful in addressing the problem of water body eutrophication.

Batteries and energy materials: High-purity cerium sulfate can be used in the manufacturing of radiation dosimeters. Additionally, as an important source of cerium, it plays a crucial role in the preparation of certain energy materials (such as functional cerium compounds).

Chemical synthesis intermediates: Cerium sulfate is an important precursor material for synthesizing other cerium compounds (such as cerium oxide). It is also a commonly used analytical reagent, used in analytical chemistry to determine substances that can be oxidized, such as nitrite, iodide, and low-valent iron salts.

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