Experiment and Mechanism Study on Shell Powder as Briquette Sulfur-Fixed Agent

Shell powder was used as coal briquette sulfur-fixed agent. Orthogonal testing method was used to study the main factors which have influences on the desulphurization ration. Its desulphurization ration is 56.6% at 1150°C, and it increased above 40% than CaCO₃. The main component of shell powder is CaCO₃. It also has high alkali metal such as Na and K, and other elements of iron, aluminum and silicon. The cinder which generated at 1150°C by coal was studied by XRD, and the mechanism that the shell powder has high desulphurization ration under high temperature is discussed. CaAlSi₂O₈ which is composite crystal is found in cinder. CaSO₄ is covered by it at high temperature, then the decomposition of CaSO₄ is suppressed. And the desulphurization ration is improved.