This paper presents the partial results of a study on obtaining compacted fuel from fine-grained coal fractions and biomass. The aim of the study was to determine the impact of selected parameters of the extrusion process and the applied binder (mechanical durability and density of the products). The fuels were formulated using the extrusion process. Raw materials used in the research were: Fine-grained coal (flotation concentrates), biomass (hydrolytic lignocellulose), and a wide spectrum of organic and mineral binders and their compositions. During the investigations, the variable factors were the following: Extrusion pressure, preparation of the mixtures for extrusion (mixing time and temperature of the mixture), composition of the extruded mixtures (share of fine-grained coal and biomass and type of binder). It was found that it is possible to extrude mechanically durable briquettes from mixtures containing fine-grained coal products and biomass. Under the conditions of the experiment, the most favorable mechanical durability was characterized by briquettes containing in their composition 90% of coal and 6% of biomass (in relation to the dry state). The briquettes with the most favorable physico-mechanical properties were obtained using organic binders-Starch (based on wheat and potato starch) and cellulose derivatives. regulated the quality requirements for solid fuels [2], the requirements for fuels introduced to the market and used in households and combustion plants with a nominal thermal power lower than 1 MW. In addition to the abovementioned legal provisions, anti-smog resolutions of individual self-government bodies came into force, which, using the amendment introduced in art. 96 in the Act on Environmental Protection Law [3], regulate types of fuels that cannot be used in individual heating in their area. The quoted legal provisions in practice mean the elimination of flotation concentrates and coal sludges from the market, and consequently, from the primary market of boilers-Devices that do not meet the requirements for class 5 boilers in accordance with standard PN-EN 303-5:2012 [4] (practically: Manual feed boilers).The elimination of flotation concentrates and coal sludges from the market may cause them to be deposited in the environment and, consequently, affects the loss of their energy potential. In general, flotation is a process widely used in the processing of minerals, including coal [5,6]. This is particularly important for flotation concentrates, which are characterized by relatively good quality parameters, and their only drawback is very fine grain size that results in excessive emission of dust during the combustion. In turn, the withdrawal of manual feed boilers that do not meet the requirements for class 5 boilers according to PN-EN 303-5:2012 [4] will increase the number of automatic boilers used in individual heating, and thus increase the demand for fuel for them (mainly qualified fuels like eco pea coals and culm). Taking into account the emerging market potential resulting f...

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The article presents the results of studies of torrefied willow (Salix viminalis L.) compaction. Densification tests were performed using a hydraulic press with a maximum pressure of 216 MPa. The effect of basic parameters of the briquetting process (pressure and temperature) on mechanical parameters of manufactured briquettes were determined. On the basis of the research, it was found that the increase in pressure and temperature of the densification process increases the density and strength of pressed briquettes. The positive effect of temperature is particularly noticeable at lower pressing pressures (36 MPa-72 MPa). In the case of a temperature of 300 o C, the increase in a pressure from 144 MPa to 216 MPa resulted in the decrease in the density and strength of the briquette. It was also found that the briquettes manufactured at this temperature are characterized by lower density and strength than the briquettes obtained at a temperature of 200 o C.