Chemical Profile & Core Properties
Calcium Lignosulfonate is a complex, lignin-based polymeric surfactant where the lignosulfonic acid has been neutralized with calcium ions.
- Solid Content: 40% – 50% (by weight)
- Density: 1.15 – 1.30 g/ml
- pH Level: 3.5 – 7.0 (Slightly acidic to neutral)
- Composition: Contains 25–30% pure calcium lignosulfonate, 3–5% residual wood sugars, and water.
- Mechanism of Action: The hydrophilic sulfonate groups impart a negative charge to suspended particles, triggering electrostatic repulsion. Simultaneously, its complex polymer chain provides steric hindrance, preventing particle agglomeration in liquid suspensions.
Core Industrial Applications
Because of its unique calcium-based cation and ready-to-pump liquid format, it is prioritized over sodium-based alternatives in several key sectors:
1. Construction & Concrete Admixtures
- Water Reducer/Plasticizer: Added directly to ready-mix concrete, Calcium Lignosulfonate liquid disperses cement grains to reduce the required water-to-cement ratio by 8% to 12%. This improves workability and increases the cured compressive strength of standard concrete mixes.
- Cement Grinding Aid: Sprayed onto clinker during the milling process, it prevents agglomeration, lowering the energy required for grinding and improving mill throughput.
4. Heavy Industry & Environmental Processing
- Ceramics & Drilling Fluids: Acts as a deflocculant to lower the viscosity of clay slurries and oil-well drilling muds.
- Wastewater Treatment: When cross-linked, it effectively adsorbs heavy metals (like lead and chromium) from industrial effluent, providing a green alternative to toxic coagulants.
Calcium vs. Sodium Lignosulfonate Liquid
Understanding which cation to choose is critical for formulation stability:
| Feature | Calcium Lignosulfonate Liquid | Sodium Lignosulfonate Liquid |
| pH Range | 3.5 – 7.0 (Acidic/Neutral) | 4.0 – 10.0 (Neutral/Alkaline) |
| Alkaline Solubility | Can precipitate in highly alkaline systems (pH > 7) | Highly soluble in extreme alkaline environments |
