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| Quantity: | |
|---|---|
Parameter | Indicator |
Appearance | White powder, free of visible impurities |
Whiteness | ≥96% |
Calcium Hydroxide Content | ≥98.5% (mass fraction) |
Iron (Fe) Content | ≤0.03% (mass fraction) |
Magnesium (Mg) Content | ≤0.3% (mass fraction) |
Fineness | Pass through 400 - mesh sieve (residue ≤0.5%) |
Moisture | ≤0.3% (mass fraction) |
Calcium Carbonate (CaCO₃) Content | ≤1.0% (mass fraction) |
Heavy Metals (calculated as Pb) Content | ≤0.002% (mass fraction) |
Low Iron And High Whiteness Calcium Hydroxide Powder (CAS: 1305-62-0), chemically Ca(OH)₂, is a specialized grade designed for producing calcium hypochlorite (bleaching powder), featuring Fe ≤0.01% and whiteness (L*) ≥92. Manufactured via hydration of high-purity quicklime (CaO ≥95%) with strict impurity control, this off-white powder exhibits high reactivity and low heavy metals, ensuring optimal chlorination efficiency in bleaching agent synthesis. With a median particle size of 50–100μm and pH 12.5–13.0 in 10% slurry, it is the preferred raw material for industrial and municipal water treatment applications demanding consistent quality and purity.
Ultra-Low Iron and High Purity:
Iron Content ≤0.01%: Significantly lower than standard Ca(OH)₂ (0.05–0.1%), minimizing catalytic decomposition of calcium hypochlorite (Ca(OCl)₂), which improves shelf life (active chlorine retention ≥90% after 6 months).
High Reactivity: ≥95% slaking efficiency in 20°C water, ensuring complete conversion to calcium hypochlorite via the reaction: 2Ca(OH)₂ + 2Cl₂ → Ca(OCl)₂ + CaCl₂ + 2H₂O, with a chlorination yield ≥98%.
Controlled Particle Size and Flowability:
50–100μm Median Size: Balances reaction surface area and dust control, reducing dust emissions by 25% during handling compared to finer grades.
Free-Flowing Texture: Angle of repose ≤35°, enabling smooth conveying in automated dosing systems for large-scale bleaching powder production (50–100 MT/day capacity).
Heavy Metal Compliance:
Pb <5ppm, As <2ppm: Meets WHO guidelines for drinking water treatment chemicals, making it suitable for producing calcium hypochlorite used in potable water disinfection (0.5–2.0 mg/L residual chlorine).
Calcium Hypochlorite Production:
Industrial Bleaching Powder: Reactswith chlorine gas to form high-purity Ca(OCl)₂ (available chlorine ≥65%), used in textile bleaching (cotton whitening efficiency +10%) and paper pulp delignification.
Water Disinfection Tablets: Fine-ground grade (D90 ≤75μm) ensures uniform dissolution, releasing 2–5ppm free chlorine in swimming pools and rural water supplies.
Chemical Synthesis:
Chlorinated Organic Compounds: Acts as a base in synthesizing chloroacetic acid and chlorophenols, with low iron preventing unwanted side reactions (impurity formation ≤0.5%).
Environmental Applications:
Wastewater Dechlorination: Neutralizes excess chlorine in industrial effluent, reducing COD by 15–20% via reaction: Ca(OH)₂ + 2HClO → Ca(OCl)₂ + 2H₂O.
Soil Remediation: Raises pH in acidic soils (pH 4.5–5.5 to 6.5–7.0), enhancing the efficacy of calcium hypochlorite in breaking down petroleum hydrocarbons.
Q: What is the ideal Ca(OH)₂:Cl₂ molar ratio for hypochlorite synthesis?
A: A 1:1.1 ratio ensures complete chlorination, with our powder’s high reactivity minimizing chlorine gas waste (≤2% unreacted Cl₂).
Q: Can this grade be used in food-grade bleaching?
A: Yes, the food-grade variant (Fe <0.005%, heavy metals <1ppm) complies with FCC Standard 21, suitable for bleaching flour and food contact paper.
Q: How to store calcium hydroxide to prevent carbonation?
A: Store in airtight containers away from CO₂ sources; bulk storage should include nitrogen blanketing to maintain reactivity (carbonation rate <5% per year).
Q: What is the difference between "low iron" and standard calcium hydroxide?
A: Standard grades have Fe 0.05–0.1%, which accelerates hypochlorite decomposition; our low-iron grade extends bleach shelf life by 30%.
