A grinding mill includes: a disc having a plurality of pins that grind a material to be ground; a housing that rotatably houses the disc; a collection port through which a ground material obtained by grinding the material to be ground is collected; a ground material flow passage that connects the housing and the collection port to each other; and an air return flow passage that is branched from the ground material flow passage and connected to the housing.

A grinding mill includes: a disc having a plurality of pins that grind a material to be ground; a housing that rotatably houses the disc; a collection port through which a ground material obtained by grinding the material to be ground is collected; a ground material flow passage that connects the housing and the collection port to each other; and an air return flow passage that is branched from the ground material flow passage and connected to the housing.

The invention relates to a method for grinding and drying a material or material mixture (M), using a cyclone device (10) which communicates with an outlet line (52) for gas (G) and material (M) processed in the cyclone device (10), wherein at least a portion of the gas (G) and material (M) in the outlet line (52) are returned into a lower opening (14) of the cyclone device (10) for further cyclone treatment. The invention relates also to an apparatus.

The invention relates to a method for grinding and drying a material or material mixture (M), using a cyclone device (10) which communicates with an outlet line (52) for gas (G) and material (M) processed in the cyclone device (10), wherein at least a portion of the gas (G) and material (M) in the outlet line (52) are returned into a lower opening (14) of the cyclone device (10) for further cyclone treatment. The invention relates also to an apparatus.

In a process for the direct recycling of electrode scrap which is yielded as production waste in the production of lithium-ion batteries, a process is to be provided which makes it possible to recycle electrode scrap from LIB production by mechanical stress without adversely changing the active materials so that it can be fed back into production. This is achieved in that the mechanical stressing of the electrode scrap includes pre-crushing the electrode scrap into bulk material and mechanical stressing of the pre-crushed electrode scrap in a conditioned atmosphere in a fluidised bed opposed jet mill.

Methods and apparatus for comminution of solid materials. Solid materials are introduced into a first pressure vessel. A working fluid is provided in the first pressure vessel at an operating pressure and an operating temperature. The working fluid is allowed to permeate into the solid materials. The working fluid may permeate into the solid materials while in a supercritical fluid phase. The working fluid is rapidly expanded to thereby create fractured solid materials from the solid materials. Rapidly expanding the working fluid may comprise causing a transition of the working fluid from a supercritical phase with a first density to a subcritical vapour phase with a second density.

Methods and apparatus for comminution of solid materials. Solid materials are introduced into a first pressure vessel. A working fluid is provided in the first pressure vessel at an operating pressure and an operating temperature. The working fluid is allowed to permeate into the solid materials. The working fluid may permeate into the solid materials while in a supercritical fluid phase. The working fluid is rapidly expanded to thereby create fractured solid materials from the solid materials. Rapidly expanding the working fluid may comprise causing a transition of the working fluid from a supercritical phase with a first density to a subcritical vapour phase with a second density.