Overview
Quicklime blocks (calcium oxide) are a cost-effective chemical agent for river dredging operations. Their high alkalinity and exothermic reaction with water make them ideal for sludge treatment, pathogen reduction, and heavy metal immobilization in sediment management. Industrial-grade quicklime blocks are produced by calcining limestone at 900–1,200°C. The material’s reactivity and particle size are critical for dredging applications, where controlled slaking is required to avoid excessive heat generation during field use.
Physical and Chemical Properties
As an inorganic compound, quicklime exhibits strong basicity (pH ~12.4 in solution) and undergoes vigorous hydration to form calcium hydroxide. Its thermal stability allows storage in bulk, though moisture-proof packaging is essential to prevent premature reaction. The material’s drying capacity stems from its water absorption ratio of 1:1.32 by weight, releasing 1,160 kJ/kg of heat. This property accelerates sludge dewatering while reducing volatile organic compounds through thermal destruction.
Main Applications
In river dredging, quicklime serves three primary functions: sediment stabilization through pozzolanic reactions, pH adjustment to precipitate dissolved metals, and organic matter reduction via thermal and chemical oxidation. Modern applications include combined use with polymers for enhanced dewatering. Typical dosage ranges from 5–20% of sludge dry weight, depending on contaminant load. Recent innovations employ slow-release formulations to minimize dust and improve worker safety.
Safety and Storage
Quicklime requires hazard-compliant storage in ventilated, dry areas separate from acids and flammables. UN classification as Class 8 (corrosive) mandates proper labeling during transportation. On-site handling demands dust suppression measures (mist sprays) and alkaline-resistant equipment. Emergency protocols should address eye/skin contact (flush with water for 15+ minutes) and inhalation exposure (move to fresh air immediately).
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch analysis reports. Key specifications include available lime index (ALI ≥75%), reactivity time (TS60 ≤3 minutes), and particle size distribution (20–80mm blocks preferred). Bulk procurement (20+ ton shipments) typically reduces costs by 15–30%. Consider regional availability—coastal suppliers often offer competitive pricing due to limestone quarry proximity. Just-in-time delivery minimizes storage risks.
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