Included are methods and systems for recycling a gas emitted from non-aqueous cleaning. An example method includes contacting a contaminated equipment with a non-aqueous cleaning material; wherein the spent non-aqueous cleaning material emits the gas. The method further comprises capturing the emitted gas, filtering the emitted gas, and recycling the emitted gas into the non-aqueous cleaning material.

Essential constructive elements of the currently known machines and devices, which work by means of vacuum blasting, are improved in the surface cleaning and engraving machine that operates via a vacuum jet process in order to enable more effective cleaning of different surfaces, further applications and simplification of the handling of the machine or device. With the modifications and additions made, the application options of the machine or device are increased, the potential of clogging the suction hose is reduced to a minimum, the service life of the machine is extended and the efficiency and operating options of the blasting hood are improved. For this purpose, technical and design details of an already known machine are supplemented and improved; there are, for instance, a metering device (3), additions to the blasting hood (6) and measures to extend the service life of the machine by using rock impact films (31).

Methods and devices for treatment of metal surfaces by means of electrically active solid particles that include a step of contact of the solid particles with the electrode of an electric source, a step of shooting the particles towards the metal surface to be treated and a step of transmission of electric charge of the particles on the metal surface to be treated. The transmission of the electricity between the electric source and the metal surface during the step of shooting preferably is by net charge of the particles or by electric conductivity by contact or by electric conductivity by means of voltaic arches. The current applied to the electrode is preferably a DC or a current that contains positive sections and negative sections.

A blasting abrasive includes a particle of hot melt resin and abrasive grains to be firmly fixed to the particle, a blasting method further includes preparing a blasting abrasive including particles of hot melt resin and abrasive grains to be firmly fixed to the particles, heating gas, and injecting both the blasting abrasive and the heated gas.

Provided is a wet blasting treatment device including a first nozzle unit that discharges, toward a target treatment region of a workpiece, slurry in which a first liquid and abrasive grains are mixed, a second nozzle unit that discharges a second liquid toward an untreated region adjacent to the target treatment region such that a liquid film is formed in the target treatment region of the workpiece, and a control unit that controls a discharge amount of the second liquid discharged by the second nozzle unit such that the liquid film has a predetermined thickness.

A blasting abrasive and a method of use are provided. The blasting abrasive includes a ferrochrome slag having a composition of SiO.sub.2 in a range of from about 30 to 40 wt% (weight percent); Al.sub.2O.sub.3 in a range of from about 25 to 35 wt%; of Fe.sub.2O.sub.3, Cr.sub.2O.sub.3, or a combination thereof in a range of from about 10-20 wt%; MgO in a range of from about 15 to 25 wt%, by weight of the ferrochrome slag. The ferrochrome slag has a particle size in a range of from about 100 to 850 .Math.m (micrometers) with a particular size distribution.

A mobile steel grit dryer used to dry steel grit may be configured with a number of different functions and features to assist a contractor in performing steel or other structure maintenance when using steel grit in resurfacing the structure. The steel grit dryer may be configured with a heat process vacuum bypass so that an off-board vacuum, such as a vacuum on a grit recycling system, may be utilized as opposed to having an onboard vacuum. The dryer may include multiple modes so that an operator may use different modes for different environmental conditions. An exoframe may provide for better durability when being transported to different jobsites. A variety of automation and safety features may also be provided to simplify and improve safety for operators.

A waterjet system in accordance with at least one embodiment of the present technology includes a cutting head and an associated catcher assembly. The cutting head directs an abrasive-containing waterjet toward a workpiece supported by a cutting deck of the catcher assembly. The catcher assembly also includes a tank and a container fluidly connected to the tank. The tank contains abrasive-containing liquid in which the waterjet diffuses after the waterjet passes through the workpiece. The container collects abrasive at least primarily by shielding abrasive-containing liquid within the container from at least some turbulence of abrasive-containing liquid within the tank during operation of the waterjet system. The catcher assembly also includes a quick-release coupling through which the container is removably connected to the cutting deck. Operating the quick-release coupling allows the container to be removed to dispose of the collected abrasive.

A device for treating 3D powder printing elements includes a first chamber with a first partial chamber and a second partial chamber separated by at least one screen grid. Grid meshes allow compressed powder residues to pass through. A rotation means rotates the first chamber about an axis of rotation, in particular with a rotary passage. The screen grid is inclined, in particular perpendicular, to the axis of rotation of the first chamber. A filling region allows filling the 3D powder printing elements into the first partial chamber. Gas medium is supplied in the first chamber, in particular in the first partial chamber. Gas medium suction means extract plastic powder residues from the first chamber, in particular from the second partial chamber. The gas medium suction means are mounted in or parallel to the axis of rotation and/or centered by the rotary means, in particular within the rotary passage.

Included are methods and systems for recycling a gas emitted from non-aqueous cleaning. An example method includes contacting a contaminated equipment with a non-aqueous cleaning material; wherein the spent non-aqueous cleaning material emits the gas. The method further comprises capturing the emitted gas, filtering the emitted gas, and recycling the emitted gas into the non-aqueous cleaning material.