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Quicklime molding equipment is mainly used to press powdered calcium oxide (CaO) into blocks, granules or specific shapes for easy transportation, storage and improved industrial application efficiency.

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1. Equipment type and working principle

Roller briquetting machine

• Principle: Quicklime powder is pressed into spherical or pillow-shaped particles by two rollers rotating in opposite directions.
• Applicable scenarios: Small and medium-sized production requirements, suitable for molding products that do not require high strength.
• Advantages: Simple structure, low energy consumption, suitable for continuous production.

Hydraulic briquetting machine

• Principle: Use hydraulic system to provide high pressure to press powder into high-density blocks.
• Applicable scenarios: Metallurgical industry (such as steelmaking and slag making), requiring high mechanical strength and low crushing rate.
• Advantages: High molding density and excellent product strength.

2. Key process parameters

Raw material characteristics

• Particle size: Usually 80-200 mesh powder is required, too coarse or too fine will affect the molding effect.
• Water content: Generally, it needs to be controlled at 1%-5%. If it is too high, it will easily lead to hydrolysis exotherm. If it is too low, a binder needs to be added.

Binder selection

• Inorganic: cement, water glass (improve high temperature resistance, but may affect purity).
• Organic: starch, polyvinyl alcohol (environmentally friendly, but the cost is high).
• No binder: Relying on high-pressure physical molding, the equipment pressure must be ≥50MPa.

Post-processing process

• Curing: Natural drying or low-temperature drying (avoid high temperature causing CaO and CO₂ to react to form CaCO₃).
• Cooling: Prevent the block from cracking due to residual heat.

3. Key points of equipment selection

• Capacity requirements: small equipment (1-5 tons/hour), medium (5-20 tons/hour), large (more than 20 tons).
• Forming strength: The compressive strength of metallurgical blocks must be ≥10MPa, which can be appropriately reduced in the field of environmental protection.
• Corrosion-resistant design: Parts in contact with quicklime must be made of 304 stainless steel or surface hardened.
• Automation level: PLC control system can realize accurate pressure regulation and fault diagnosis.

4. Common problems and solutions

• Breakable after molding
• Reason: Insufficient pressure or too low moisture.
• Countermeasure: Adjust hydraulic pressure to 60-100MPa, or add 1%-3% moisture/binder.
• Severe equipment wear
• Reason: Abrasiveness of quicklime.
• Countermeasure: Use tungsten carbide coated roller surface or replace mold regularly.
• Dust pollution
• Countermeasure: Equipped with pulse bag dust collector and sealed conveying system.