NOVELTY - Preparation by torrefaction of a solid fuel involves heating a starting composition indirectly, where the heating takes place at a mass temperature of approximately 150 to approximately 360degreesC and a secondary recovered fuel (SRF) material is present in the starting composition.    USE - For the preparation of solid fuel, preferably a purified solid fuel; for removal of at least one metal such as aluminum from a solid fuel; as a fuel for a coal-fired power plant and for other energy production (claimed); in pulverized-coal power plants.    ADVANTAGE - The solid fuel prepared by the method has reduced chlorine content; and is in the form of a granulate (preferably with a granulate size less than 40 mm, preferably less than 10 mm). The particle size of the solid fuel prepared by the method is less than 3 mm (preferably less than 2 mm, especially less than 1 mm). The solid fuel prepared by the method is technically suitable to be used universally for a multitude of combustion plants without any pre-treatment being required. The method provides the solid fuel in good yield; provides a solid fuel having high energy density and/or contains little fine dust which is important during storage and transport. The method provides fuel that contributes to the reduction of carbon dioxide emission without using costly starting materials and exhibits good properties. The number of by-products formed during the process is less and hence the process is more simpler and economical as compared to the prior art methods. The solid fuel prepared by the method has higher bulk width than the starting material, which increases the possibility concerning transport of the fuel. The use of secondary recovered fuel (SRF) material in torrefaction process to obtain solid fuel leads to excellent results regarding the levels of heavy metals and trace elements in the fly ash. The fuels prepared by the method can be used in coal-fired power plants without necessitating fundamental changes in the logistic infrastructure of the installations. The solid fuel prepared by the method can be used in pulverized-coal power plants because of very good combustion behavior (90% in 0.5 seconds) compared with coal with 40-80% in the same time. The number of undesired substances present in the SRF are removed by the method thereby ensuring that the fuel is an attractive fuel from ecological viewpoint. The torrefaction of SRF results in reduction of presence of heavy metals and trace elements such as mercury, cadmium, lead and chlorine. The use of at least 50% SRF results in reduced quantity of fine dust in the obtained fuel and excellent bulk weight, as the SRF used is a cheap product. The method reduces the formation of alkali chlorides during torrefaction and subsequent washing. The method has short process time as it is not necessary to allow the torrefied solid fuel to cool before it is washed. The bath containing a solvent also serves as wet lute which seals the content of reactor against any incoming oxygen. The solubility of organic chlorine compounds at 60-80degreesC is highly increased.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) removal of at least one metal from a solid fuel involving: providing a solid fuel or the solid fuel obtained by using the method; reducing the thus obtained solid fuel to a particle size of less than 3 (preferably less than 2, especially less than 1) mm; and separating the at least one metal from the reduced solid fuel thus obtained; and    (2) method (P1) for reduction of the 'total chlorine content' of a solid fuel obtained by the method, involving: washing the solid fuel with a solvent, in which solvent chlorine compounds present in the solid fuel dissolve.