An experimental study of sulphur capture with cement raw meal and its volatility at a high temperature

Experiments were carried out to study the process of sulphur dioxide capture with cement raw meals, and effects of sulphur evaporation (i.e. the captured sulphur in the raw meal evaporates into SO2 at a calcination temperature) on the efficiency such a process. In the study, four samples of raw meals with various ingredients were prepared; with a combined application of DSC-TGA-FTIR, the amount /degree of SO2 released from those samples under normal atmosphere were measured /analysed based on measurements results with TG, DSC, DTG and IR 3D imaging / mapping. Results as obtained showed that: 1. the amount of released SO2 increased with an increase of sulphur content in raw meals when temperature increases from 35 °C to 1450 °C; 2. a higher temperature is required to initiate SO2 releases when the sulphur content in raw meals is lower. Such results are in an agreement with a fact that a decrease sulphur content in a raw meal leads to a significant increase its melting and calcinating temperature, and preventing the formation of liquidus, and sulphur from evaporating.