A low rank coal or peat has various impurities removed therefrom by a drying process. The impurities may be removed in a subsequent operation. The dried coal or peat will not absorb substantial moisture when stored or transported....http://www.google.es/patents/US4810258?utm_source=gb-gplus-sharePatente US4810258 - Low rank coal or peat having impurities removed by a drying process
Low rank coal or peat having impurities removed by a drying process
