Hydrogen chloride (HCl) absorption by raw meal and raw meal compounds, using in-situ HCl generation and TGA-FTIR tests

Add time:08/31/2019    Source:sciencedirect.com

HCl emission control optimization from cement plants requires a quantification of the HCl absorption capacity of raw meals (mixtures of fine particles of raw materials) and the determination of raw meal constituent effects on HCl capture below 400 °C. This work reports lab data obtained by ramping temperature tests using a standard TGA-FTIR set-up, a thermally degradable solid HCl source (AlCl3·6H2O), industrial raw meals, and mixtures of reagent grade raw meal constituents (SiO2, CaCO3, Fe2O3, and Al2O3). The lab data showed that industrial raw meals had significantly higher HCl absorption capacity than reagent grade CaCO3. The presence of Fe2O3 promoted HCl capture by CaCO3 between 90 °C and 350 °C. The HCl absorption by raw meals was higher when the HCl source was dispersed rather than when it was placed below the raw meals.

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