Lime Dissolution Mixing Tank
Overview
Lime dissolution mixing tanks are specialized vessels designed to prepare lime slurry by dissolving hydrated or quicklime in water. They are widely used in industries requiring precise pH control, such as wastewater treatment, mining, and flue gas scrubbing. The tanks typically integrate mechanical agitators to ensure uniform mixing and prevent lime particles from settling. Their design prioritizes chemical resistance and durability, often incorporating materials like stainless steel or polypropylene to withstand alkaline conditions.
Structure and Working Principle
A standard lime dissolution tank consists of a vertical or horizontal cylindrical vessel, an electric or hydraulic agitator, inlet/outlet ports, and often auxiliary components like pH probes or density meters. The agitator’s blades create a vortex to suspend lime particles uniformly. Some advanced models include jet mixers or recirculation pumps to enhance dissolution efficiency. The slurry concentration is typically maintained at 10–30% w/w, depending on the application. Larger tanks may feature baffles to reduce vortexing and improve mixing stability.
Key Features
Corrosion resistance is critical due to lime’s high pH (≥12). Stainless steel 316L is common for aggressive environments, while rubber-lined tanks offer cost-effective alternatives. Polypropylene tanks are lightweight and ideal for smaller-scale operations. Modern tanks often include automation features like programmable logic controllers (PLCs) to adjust agitation speed or slurry density in real time. Explosion-proof designs are available for hazardous areas where lime dust may accumulate.
Application Areas
Water treatment plants use these tanks for softening hard water or neutralizing acidic effluents. In flue gas desulfurization (FGD), lime slurry reacts with sulfur dioxide to reduce emissions. The mining industry employs them for ore processing and tailings treatment. Other applications include pulp/paper manufacturing, food processing (e.g., corn wet milling), and soil stabilization in construction. The tanks’ versatility makes them indispensable in industries handling bulk lime.
Maintenance and Precautions
Regular inspection of agitator seals and motor bearings prevents mechanical failures. Lime scale buildup should be removed periodically using acid washing (e.g., citric acid) to maintain efficiency. Operators must wear PPE (gloves, goggles) when handling lime due to its caustic nature. Proper ventilation is essential to avoid airborne dust, which can cause respiratory irritation. Storage of dry lime near the tank should be moisture-free to prevent premature clumping.
B2B Procurement Guide
When sourcing lime dissolution tanks, verify material certifications (e.g., ASTM standards for stainless steel) and agitator torque specifications. Customization options like heating jackets or CIP (clean-in-place) systems may be required for specific processes. Suppliers with ISO 9001 certification are preferable for quality assurance. Lead times vary from 4–12 weeks for made-to-order tanks. Consider total cost of ownership, including energy consumption of agitators and liner replacement frequency.
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