Development of Desulfurization Reactivity Index for Quicklime from Eight Locations

Abstract

Aim of this paper is to develop an evaluation index of desulfurization reactivity for quicklime calcined limestone that produced from eight different mining in Japan. The quicklime is calcined at 1173 K under air atmosphere, and the desulfurization reactivity is investigated by a fixed bed quartz reactor.
The desulfurization experiments are performed for 120 min at 1173 K under SO₂/N₂ atmosphere. Variation of CaO conversion during reaction obtained for eight different quicklime. Effects of physical and chemical characteristics of limestone or quicklime on CaO conversion are examined. Geological time, thermal conductivity, calcination temperature, crystal grain size, surface area and pore volume are analyzed for an investigation of the evaluation index.
The quicklime having macro-pore over 1, um shows good desulfurization reactivity. Therefore, CaO conversion, X₁₂₀, is closely connected with total macro-pore volume for over 1 μm, P_v1.0. Its cor relation coefficient, R², is 0.945. The desulfurization reactivity for various limestone is able to estimate accurately by the evaluation index, P_v1.0.