Influence of Raw Material Fineness on Clinker Burnability and Cement Performance

Area of Science:

• Materials Science
• Chemical Engineering
• Construction Materials

Background:

• Particle size of raw materials significantly impacts clinker formation and cement performance.
• The precise influence of individual raw material fineness on clinker burnability requires further investigation.

Purpose of the Study:

• To systematically investigate the effect of limestone, shale, and iron-bearing material fineness on raw meal burnability.
• To evaluate the impact of raw material fineness on clinker phase composition, free lime content, and cement properties.
• To determine the predominant raw material component influencing clinker burnability.

Main Methods:

• Systematic variation of limestone, shale, and iron-bearing material fineness (5-20% residue on 80 μm sieve).
• Evaluation of burnability through free lime content (f-CaO) analysis.
• Characterization of clinker phase composition (C3S, C2S, C3A, C4AF).
• Assessment of cement strength development and hydration behavior.

Main Results:

• Limestone fineness was identified as the primary factor influencing free lime content and clinker burnability.
• Fineness adjustments in aluminosilicate and iron-bearing materials had minor effects on burnability.
• Clinkers with 10-15% sieve residue showed consistent phase compositions.
• Cement pastes exhibited similar setting times, mechanical strengths, and hydration products across tested variations.

Conclusions:

• Limestone fineness is the dominant parameter controlling clinker burnability.
• Cement performance is robust to moderate variations in raw material fineness when limestone fineness is optimized.
• Adequate control over limestone particle size ensures consistent cement quality and performance.