Vyatkin K. Energy-saving technology of Portland cement using gas-condensate processing waste

The thesis deals with the research of possibility of using gas-condensate processing wastes in Portland cement production to reduce clinker synthesis temperature by 150 °C. The paper novelty is caused by thermodynamic grounding of possibility for synthesis of basic clinker minerals at lower temperatures using gas-condensate pro-cessing slurry as a mineral additive. As a result of the performed studies, it is found that under the conditions of Portland cement clinker burning-out, reactions of interaction are starting between mineral and organic component of wastes, and the reaction products have an intensifying effect on reactions of calcium carbonate decomposition, resulting in the conditions for flowing of reactions of two- and tricalcium silicates formation at lower temperatures than in case of the usual clinker burning-out technology. The processes of mineral formation of Portland-cement clinker with organic and mineral additive are studied, and the constant of the total phase-formation process rate is determined. Hydration products of Portland cements with organic-mineral additive are determined, which are hydrosilicates, hydrocarboaluminates of calcium, Portlandite, ettringite and secondary calcium carbonate in colloidal, crystalline and cryptocrystalline state, which provides silica-stone solidification strength. As a result of the physical and mechanical studies, it is found that the obtained cements are quick-hardening (hardening terms: beginning from 54 to 60 min., end from 90 to 150 minutes) hydraulic binding materials with normal density of 0.27 and grade of 400.