A process for purifying a solid that has a contaminant adhered to a surface of the solid includes passing the solid through a mechanical agitator, agitating the solid comprising the contaminant adhered to the surface of the solid in the mechanical agitator, removing at least a portion of the contaminant from the surface of the solid based on the agitating to form a purified solid, and removing the purified solid from the mechanical agitator.

A laboratory mill is shown and described with at least one oscillatably mounted grinding bowl holder for at least one grinding bowl and with at least one line for transporting a liquid or gaseous medium, the line having at least one compensating element for compensating relative movements between the grinding bowl holder and/or the grinding bowl and a stationary part of the laboratory mill. In accordance with the invention, a rigid compensating element is provided for compensating relative movements, wherein the compensating element is elastically deformed at least in regions during an oscillating movement of the grinding bowl holder and wherein the compensation of relative movements is effected free of parts of the compensating element connected to one another so as to be movable, in particular rotatable and/or pivotable, relative to one another and only by elastic deformation of the compensating element.

A silicon material can include a silicon aggregate comprising a plurality of porous silicon nanoparticles welded together. The silicon aggregate can optionally have a polyhedral morphology. A method can include: receiving a plurality of porous silicon nanoparticles and cold welding the plurality of porous silicon nanoparticles into an aggregated silicon particle.

A agitating wet ball milling apparatus, by connecting one end of the second separation chamber in the length direction with the first separation chamber to form a second separation channel, increases the separation flow rate and reduces the pressure in the first separation chamber. During separation, the mass of the grinding balls is much greater than the diameter and mass of the material. When a small amount of grinding balls enter the first separation chamber, they move to the bottom of the first separation chamber under the action of gravity. The second separation chamber keeps the grinding balls away from the discharge port and also reduces the number of grinding balls in the first separation chamber that enter the second separation chamber for discharge. This ensures the separation flow rate while reducing the phenomenon of ball leakage and improving the grinding efficiency.

The invention relates to A powder production system comprising a body (2), at least one mill (3) located on the body (2) so as to rotate about its axis, more than one ball (b) being located in the mill (3), the balls (b) acting on a material to be ground (m) therein by exerting frictional and impact forces on the material to be ground (m) so that the material to be ground (m) is brought to a powder form, and at least one gas supply unit (7) located on the body (2), therebyenabling gas (g) to flow into the body (2).

A device that effectively produce matcha powder is provided and includes: a stirred media mill grinding portion, having a grinding chamber inside, wherein a side of the stirred media mill grinding portion defines an outlet port; a pin bar, rotatably received in the grinding chamber, wherein an outer circumference of the pin bar defines an opening, communicated with the grinding chamber; an air classifier, connected to the outlet port through a first tube assembly and defining a first output port and a second output port; a storage portion, connected to the first output port; a collector portion, connected to the second output port through a second tube assembly; and a wind guider, wherein an air outlet of the wind guider is connected to the outlet port and an interior of the storage portion to create a negative pressure environment.

Methods for reducing moisture content of alkaline earth metal carbonate may include introducing alkaline earth metal carbonate having a moisture content ranging from about 0.1% by mass to about 10% by mass into a primary crusher and operating the primary crusher to obtain alkaline earth metal carbonate particles having a top cut particle size d.sub.90 of 90 microns or less. The method may also include introducing the particles into a primary grinder and operating the primary grinder to obtain reduced-size alkaline earth metal carbonate particles having a median particle size d.sub.50 of about 60 microns or less. The method may further include introducing the reduced-size particles into a classifier mill and operating the classifier mill to obtain further-reduced-size alkaline earth metal carbonate particles having a median particle size d.sub.50 of about 12 microns or less, and a moisture content of about 0.15% by mass or less.

A device for mechanical activation of organic and/or inorganic substances and/or substance mixtures in chemical, pharmaceutical, food-related and/or building material-related applications includes a disk-like agitating body for rotationally fixed mounting on an agitator shaft, and at least one impact unit, which has a head region with an activation surface for cooperation with activation bodies, wherein the at least one impact unit is fastened to the disk-like agitating body radially on the outside with respect to an axis of rotation of the disk-like agitating body. An agitator system with the device is also disclosed.

A method and system for mechanical activation of organic and/or inorganic substances and/or substance mixtures in chemical, pharmaceutical, food acceptable applications and/or in applications useful for building purposes, includes feeding of a substance and/or substance mixture to be activated through an inlet opening into a container which stores activation bodies, feeding a process gas stream into the container, wherein the process gas stream can support transportation of the substance and/or substance mixture to be activated, mechanically activating the substance and/or substance mixture in the container by a rotating apparatus, wherein at least one beating unit of the apparatus interacts with the activation bodies, discharging the substance and/or substance mixture activated by the activation bodies from the container through an outlet opening, wherein the substance and/or substance mixture dwells in the container for a predetermined dwell time.