Abstract
This work focuses on revealing the chemical reaction equilibrium behaviors of gas–liquid–solid heterogeneous phases in an oxy-thermal carbide furnace. From a CaC2 formation mechanism investigation, it was determined that a one-step mechanism occurs when there is an excess of C and a high CO partial pressure, which inhibits the formation of Ca in the system, and a two-step mechanism occurs when there is insufficient C and a low CO partial pressure, which promotes the formation of Ca. Based on the calculated results of the equilibrium compositions at 100 kPa and different temperature conditions, the chemical reaction equilibrium behaviors of gas–liquid–solid heterogeneous phases in an oxy-thermal carbide furnace were analyzed at conditions of excess C and insufficient C.
Highlights
Calcium carbide (CaC2) is an important chemical produced from the reaction of CaO with coke in a carbide furnace
This study demonstrates that the CaC2 formation mechanism depends on two factors, the amount of C and the CO partial pressure
When the C is in excess and the CO partial pressure is high, the production of Ca is limited; the CaC2 formation is believed to be a one-step mechanism
Summary
Calcium carbide (CaC2) is an important chemical produced from the reaction of CaO with coke in a carbide furnace. In 1979, 1987, and 2001, Kim [13] and Wang [14] reported that the CaC2 formation mechanism is a one-step process They found that, when the CO partial pressure is 100 kPa, the initial reaction temperature of CaO with C is 1850–2043 K, and no smelt is observed in the reaction residue, which is in accordance with the research of Thoburn [15] in 1965. The curve lines on the T-pCO coordinate are the shadows of ∆G2(T,p) = 0 at different pCa values, which means that the equilibrium of the reaction shifts to the formation of products.
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