A method for processing oil shale material

摘要

The method according to the invention for processing oil shale material consists of the following method steps where in a retort hydrocarbons are expelled thermally in vapour from the oil shale material, and the oil shale ash remaining during this process is heated outside the retort together with a gas stream. The resultant material-laden hot gas stream is separated in the first separator into a gas stream and a material stream, the material stream containing a coarser and a finer fraction. Thereafter the material stream is classified in a classifier with a proportion of the gas stream, the coarser fraction of the material stream being introduced into the retort, while the finer fraction is carried away together with the gas stream separately from the coarser fraction.