Open AccessTheoretical and experimental studies of energetics of the dolomite decarbonization process
Author(s) -
Varvara Vinnichenko,
А. Н. Рязанов,
Р З Рахимов,
A.A. RIAZANOV,
O V Vinnichenko
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1164/1/012064
Subject(s) - dolomite , raw material , coal , lime , waste management , portland cement , cement , materials science , magnesium , fly ash , environmental science , metallurgy , pulp and paper industry , chemical engineering , chemistry , engineering , organic chemistry
One of the known advantages of magnesia binders is a significant reduction in energy consumption for the production of such binders compared to the production of lime and Portland cement. The theoretical costs of thermal energy for firing dolomite, which amount to 220-230 kcal/kg (for Portland cement – 420-430 kcal/kg), are almost halved under equal conditions of raw material moisture and furnace efficiency. This study examines the screening of dolomite waste and coal waste materials as raw materials for the production of dolomite cement. Coal preparation wastes in this case are both the initial raw material and, in part, can be used as fuel to ignite the raw charge. Theoretical and experimental studies of the influence of the organic component of coal waste on the process of decarbonization of dolomite have been carried out. The results of thermodynamic studies show that the participation of carbon and its gasification products in the reactions of dissociation of magnesium carbonate makes it possible to reduce the temperature of the beginning of the decomposition reaction of MgCO 3 and CaCO 3 . The energy feasibility of obtaining dolomite binders has been theoretically substantiated.