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THE INFLUENCE OF RAW MEAL PREPARATION, BURNING AND COOLING CONDITIONS ON CLINKER MINERALOGY AND CRYSTALLOGRAPHY WITH THE RESPECT OF CEMENT GRINDABILITY

CEMENT

[:ru]Досков К.[:en]Doskov K.[:] [:ru]магистр геологии и минералогии, руководитель отдела технического развития, CHRYSO SAS[:en]CHRYSO SAS, Technical Development Manager — BU cement[:]

Alitinform №2 (09) 2009 г. 37-41 p.

Abstract

The raw mix chemical composition corresponds to the clinker quality requirements expressed by Lime Saturation Factor (LSF); Silica Module (SM); Alumina Module (AM) or by the potential clinker phases — C2S; C3S; C4AF; C3A. Those phases are solid solutions and result after thermodynamic transformation of the main raw mix oxides — CaO; SiO2; Al2O3; Fe2O3.

The raw mix is fed into the kiln and gradually heated. Successive chemical reactions take place as the temperature of the raw mix rises:

  • 70 to 110°C — free water is evaporated;
  • 400 to 600°C — clay–like minerals are decomposed into their constituent oxides, principally SiO2 and Al2O3. Dolomite (CaMg(CO3)2) decomposes to calcium carbonate, MgO and CO2;
  • 650 ot 900°C — calcium carbonate reacts with SiO2 to form belite (Ca2SiO4);
  • 900 to 1050°C — the remaining calcium carbonate decomposes to calcium oxide and CO2;
  • 1300 to 1450°C — partial (20–30%) melting takes place, and belite reacts with calcium oxide to form alite (Ca3O.SiO4).
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