化工学报2013，Vol.64Issue(8)：2860-2866,7.DOI:10.3969/j.issn.0438-1157.2013.08.023
CaS-CaSO4是否共熔的DTA和TG实验研究
DTA & TG measurement and analysis of CaS-CaSO4 system
摘要
Abstract
In the process of direct hydrogen production from coal with CaSO4 as oxygen carrier,CaS and CaSO4 are used together at a high temperature.There is a dispute in literature whether an eutectic phenomenon occurs between them,although the melting points of them are above 1400℃.TG and DTA measurements of CaS,CaSO4 mixtures with different molar ratios were performed using a atmospheric thermal analyzer under nitrogen atmosphere.The results showed that within 700℃ to 1300℃,the DTA curves of endothermic peaks within 850-1100℃ were due to the endothermic solid-solid reaction between CaS and CaSO4.The temperatures when the first endothermic peak appeared and the temperatures when the fastest change of DTG curves happened were compared between different samples.No eutectic point was found,which meant eutectic phenomenon did not exist within 700-1300℃.Similar analyses were performed on CaO,CaS and CaSO4 mixture samples,and no eutectic evidence was found within 700-1500℃.The conclusions above were also confirmed by the SEM analyses performed on the residue samples.关键词
共熔温度/CaSO4/CaS/DTAKey words
eutectic temperature/ CaSO4/ CaS/ DTA分类
能源科技引用本文复制引用
樊腾飞,赵丽凤,王波,田文栋,程晓磊,肖云汉..CaS-CaSO4是否共熔的DTA和TG实验研究[J].化工学报,2013,64(8):2860-2866,7.基金项目
国家自然科学基金项目(51176186) （51176186）
国家高技术研究发展计划项目(2008AA05A302).supported by the National Natural Science Foundation of China (51176186) and the High-tech Research and Development Program of China (2008AA05A302). （2008AA05A302）
