A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

摘要

Mechanical thermal expression (MTE) is an effective and efficient method of dewatering high moisture content lignite. However the high total organic carbon (TOC) of the wastewater requires further chemical treatment, before discharge to the environment. In this work, changes in the characteristics of the solid products and the wastewater are reported, when sulphuric add is used as part of the MTE process.