Environmental aspect of chemical pretreatment of slovak brown coal with nitric acid

Abstract

With the aim to produce a low-sulphur coal by the nitric acid pretreatment, a research was undertaken on the influence of the different process parameters, such as temperature, time, acid concentration, particle size and physical pretreatment on the sulphur decrease, nitrification of the product and the variation in the ash composition for Slovak brown coal.

Keywords

• brown coal
• nitric acid
• desulphurization