2.3. Conversion of the residual solid
2.3.1. MDF fiber board and electric energy productions
The residual solid is treated with saturated steam (160–180 ◦C), and it is pressurized refined to obtain a homogeneous size fibrous material. This material is mixed with urea formaldehyde resin (8–10%) and molten paraffin. The mixture is dried by flash drying to 8–12% of moisture. Hot pressing processes is used to MDF formation, applying pressure and temperature for a short period to obtain the board. The residual solids from autohydrolysis are combusted to produce high-pressure steam for electricity generation. The steam turbine turns a generator that produces AC electricity.