Industrial mixing container and liner and method of use

A mixing vessel with an inner liner, the mixing vessel having a feed opening on an upper side of the mixing vessel with a first flange that projects radially outward from the feed opening and a discharge duct on a lower side of the mixing vessel having a discharge flap valve that can be adjusted between an open position and a closed position, the mixing vessel configured to be connected onto a mixing head of an industrial blender, said mixing head supports one or multiple mixing tool(s), for a process of blending bulk material introduced into the mixing vessel, the inner liner comprising:

• a body having an upper side with a second flange that projects radially outward, the second flange bears against the first flange of the mixing vessel;
• the body having a bottom side comprising a discharge duct extension which projects into the discharge duct of the mixing vessel to at least the discharge flap valve when in the closed position;
• the discharge duct extension having clamping extensions and diametrically opposed axle recesses that allow the clamping extensions to extend across the discharge flap valve of the mixing vessel in the closed position;
• wherein the peripheral outside of the discharge flap valve in the closed position acts against the inside wall of each of the clamping extensions so that the clamping extensions are clamped between the discharge flap valve and the inside wall of the discharge duct.