Shoji Ozawa*, Eizo Maruyama**, Hitoki Matsuda* and Masanobu Hasatani**

*Reserach Center for Advanced Waste and Emission Management, Nagoya University
**Department of Energy Engineering and Sciences, Graduate School of Engineering, Nagoya University

+ Correspondence should be addressed to Shoji Ozawa:
(Furo-cho, Chigusha-ku, Nagoya 464-8603 Japan)

Abstract

A large amount of coal slag, is discharged from coal utilization processes as industrial waste and much of it contains metal oxides which react with acidic gases. Based on this point, we evaluated the suitability of coal slag as a H2S absorbent at high temperatures (1,123-1,273K, H2S: 0.7-1.1%, H2: 6.3%) in order to develop a new way of reutilizating coal slag. The following finds were obtained from the present study. (1)Coal slag has a reactivity for H2S capture at high temperature. It was found that the sulfidation reaction of coal slag was very rapid at the early stage of the reaction. (2)The iron component, involved in coal slag, played an important role in sulfur capture. It was not observed that the calcium component in coal slag showed a reactivity with sulfur. (3)It was clarified that the reactivity of coal slag with H2S was mainly influenced by the amount of Fe content on the surface of the coal slag particles. (4)The influence of the temperature on the conversion of iron into iron sulfide was not clearly shown in the range of 1,123-18273K.

Key words: coal slag, H2S gas cleaning, desulfurization, iron