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 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.

The invention relates to a process for obtaining natural rubber from plant material containing at least the step of milling the plant material with at least one ball mill comprising milling media. The invention further relates to the natural rubber obtained by this process and to the use of at least one ball mill comprising milling media for milling plant material when obtaining natural rubber from plant material.

In the process, the ball mill has a nonmetallic lining and/or the milling media have at least a nonmetallic surface.

The invention relates to a process for obtaining natural rubber from plant material containing at least the step of milling the plant material with at least one ball mill comprising milling media. The invention further relates to the natural rubber obtained by this process and to the use of at least one ball mill comprising milling media for milling plant material when obtaining natural rubber from plant material.

In the process, the ball mill has a nonmetallic lining and/or the milling media have at least a nonmetallic surface.

A method for the cryogenic grinding of at least one powder comprising the following steps: (a) introducing a cryogenic fluid into an attrition mill comprising attrition means, (b) introducing the powder or powders into the attrition mill, and (c) setting the attrition mill in rotational motion, and whereinthe ratio V.sub.MA/(V.sub.MA+V.sub.FC) of the volume of the attrition means V.sub.MA to the sum of the volume of the attrition means V.sub.MA and the volume of the cryogenic fluid VFC is comprised between 0.2 and 0.8, and the rotational speed of the attrition mill during step (c) is between 100 rpm and 20,000 rpm. Further, particles of metal or metal alloy, to the use thereof, to a coating method employing them and to the use of such a coated material.

The invention relates to a method for eliminating hollow defects in atomized superalloy powder, and pertains to the field of powder metallurgy materials. A ball-milling processing is conducted on the atomized alloy powder to eliminate the hollow defect, obtain solid powder and increase powder utilization efficiency. By controlling mill ball diameters, mass ratio of mill balls with different diameters, mass ratio of ball to powder and ball milling time, a multi-directional impact on the powder is achieved, thereby control powder shape and obtain solid spherical powder. The invention eliminates powder hollow defect by using ball milling process and equipment. This invention with high powder utilization efficiency, short ball milling time and simple operating process, can be used for large-scale preparation and application.

The invention relates to a method for eliminating hollow defects in atomized superalloy powder, and pertains to the field of powder metallurgy materials. A ball-milling processing is conducted on the atomized alloy powder to eliminate the hollow defect, obtain solid powder and increase powder utilization efficiency. By controlling mill ball diameters, mass ratio of mill balls with different diameters, mass ratio of ball to powder and ball milling time, a multi-directional impact on the powder is achieved, thereby control powder shape and obtain solid spherical powder. The invention eliminates powder hollow defect by using ball milling process and equipment. This invention with high powder utilization efficiency, short ball milling time and simple operating process, can be used for large-scale preparation and application.

A method for producing fatty acid alkyl esters and glycerol implementing a set of transesterification reactions between at least one vegetable or animal oil and at least one aliphatic monoalcohol includes: introducing, into a three-dimensional microball mill at least one vegetable and/or animal oil, at least one aliphatic monoalcohol and at least one heterogenous and/or homogenous catalyst in order to form an initial mixture; grinding the initial mixture at a temperature50 C., in a three-dimensional microball mill, for a residence time5 minutes; recovering, at the outlet of the three-dimensional mill, a final mixture including at least fatty acid alkyl esters, glycerol, the catalyst and the aliphatic monoalcohol that has not reacted; and separating this final mixture of a first phase including the fatty acid alkyl esters and of a second phase including the glycerol, the aliphatic monoalcohol that has not reacted and the catalyst.

A method for producing fatty acid alkyl esters and glycerol implementing a set of transesterification reactions between at least one vegetable or animal oil and at least one aliphatic monoalcohol includes: introducing, into a three-dimensional microball mill at least one vegetable and/or animal oil, at least one aliphatic monoalcohol and at least one heterogenous and/or homogenous catalyst in order to form an initial mixture; grinding the initial mixture at a temperature50 C., in a three-dimensional microball mill, for a residence time5 minutes; recovering, at the outlet of the three-dimensional mill, a final mixture including at least fatty acid alkyl esters, glycerol, the catalyst and the aliphatic monoalcohol that has not reacted; and separating this final mixture of a first phase including the fatty acid alkyl esters and of a second phase including the glycerol, the aliphatic monoalcohol that has not reacted and the catalyst.

A production device for preparing a building material using a fine particle silt in iron tailings includes an operation desk and a grinding device. During movement of edge plates, gears are located inside a side groove and keep meshing with toothed grooves, the edge plates will drive various gears to rotate along a same direction and drive grinding balls and connecting shafts to rotate while moving, the grinding balls will perform grinding treatment on the fine particle silt at the inner end of the grinding cabinet while rotating.