The effect of demineralization towards gasification performance of low-rank coal

Abstract

Gasification process is an alternative way to utilize low-rank coal. However, gas production is not very high due to the high content of volatile matters and high mineral content. One interesting way to increase gas production is by reducing the mineral content in the coal by acid leaching process. In the present study, acid leaching is occupied to pre-treat the coal by using HF solution so that the mineral content in the coal can be leached out. The results show that acid leaching process successfully decreased the ash content in the coal. However, in terms of gas production, it appears that acid leaching slightly decreases the total gas production. It could happen since acid processing of coal might increase its crystallinity and thus it becomes more difficult to be gasified.