Reactions of calcium compounds and coke for preparation of calcium carbide

To understand a novel process for preparation of calcium carbide(CaC2) from pulverized feed stocks,the reactions between a coke and various calcium compounds including calcium carbonate(CaCO3),calcium hydroxide(Ca(OH)2),residue from the reaction of CaC2 with water,CaSO4(the main compound in FGD residue) and calcium oxide(CaO) were examined in a TG-MS system up to 1850℃.The results show that all the calcium compounds,except CaSO4,can be used directly for CaC2 preparation,which starts at about 1450℃ and peaks at about 1740℃.The H2O and CO2 generated from the decomposition of the calcium compounds have little effect on CaC2 formation.At about 920℃ CaSO4 reacts with coke to form CaS,which does not react further with the coke in the temperature rang studied.