A vacuum grinding system having multiple elements connected in series. The elements include an input chamber next to the system input, which chamber can be fluidically connected to a vacuum pump; a grinding chamber which is arranged downstream of the input chamber and which can be fluidically connected to a vacuum pump; and an output chamber, downstream of the grinding chamber and next to the output system, which output chamber can also be fluidically connected to a vacuum pump.

A method and apparatus for grinding a particulate material is disclosed. The method may include providing a system including a roller mill apparatus and a hammermill apparatus, operating the roller mill apparatus and the hammermill apparatus, adjusting a feed rate of particulate material to the roller mill apparatus until power consumption by operation of the roller mill apparatus achieves a target power consumption for the roller mill apparatus, and adjusting a gap between mill rolls of the roller mill apparatus until power consumption by operation of the hammermill apparatus achieves a target power consumption for the hammermill apparatus. The system may include roller and hammermill apparatus with sensing and controlling apparatus configured to operate the roller and hammermill apparatus according to the methods disclosed.

A device for the comminution of free-flowing feed material is provided that includes a housing enclosing a comminution chamber which contains a rotor that rotates around an axis, and has comminution tools over its circumference. A feeding device to transport the feed material to the comminution chamber in form of a gas-solid matter mixture, wherein the feeding device features a pneumatic sieve passage which uses the effect of gravity for removal of foreign particles from the feed material. In order to operate both the sieve passage and the device under optimal process parameters, the device features at least one inlet port for the supply of secondary air, wherein the at least one inlet port flows into the gas-solid matter mixture downstream of the sieve passage.

A portable system and method for processing waste to be solidified and placed in an active cell of a landfill. A portable pugmill is moveable adjacent an active cell of a landfill; and portable devices, which may be mounted on sleds or trailers, may be used for feeding the pugmill with waste to be solidified into a landfill-ready state. The waste may be fed to the pugmill without the need for long-term waste storage devices, and avoiding substantial delays between discharge of the waste from trucks to the pugmill-feeding steps.

An automatic cleaning device for a ring hammer crusher, and a ring hammer crusher having the automatic cleaning device are provided. The automatic cleaning device includes an automatic cleaning assembly at a back side of a feeding opening of a crushing chamber of the ring hammer crusher; the automatic cleaning assembly includes a material meeting disk and a cleaning blocking rod; the material meeting disk is connected to a drive member and is driven by the drive member to rotate, and the cleaning blocking rod is fixed to the crushing chamber and is cooperated with a material meeting surface of the material meeting disk for cleaning. The ring hammer crusher having the automatic cleaning device has a simple structure and convenient operation, thus improving cleaning effect.

A crusher includes a housing having an inlet and an outlet at opposite axial sides, an impeller positioned proximate the inlet of the housing, and a shaft connected to the impeller and extending axially through the housing between the inlet and the outlet. At least two spaced apart support structures hold the shaft in the housing, where a plurality of dynamic blades extending outwardly from the shaft are alternatingly positioned between a plurality of fixed blades extending radially inward from an inner wall of the housing.

A pulverizer for reducing a size of input material particles having a housing, a rotatable shaft with rotor arms and at least one airflow deflector cooperating with the rotor arms to deflect airflow within the pulverizer so as to form at least two overlapping vortices within the interior chamber such that input material particles in suspension in both overlapping vortices collide with each other to be thereby pulverized. The pulverizer also having a housing liner including a plurality of housing liner portions attached to and extending along a outer structural wall of the housing. The pulverizer also having a housing sidewall having an outer structural wall with a plurality of wall sections. The pulverizer also having canted rotor arms and rotor arms with removable wear pads. An anti-caking device for a vessel such as a pulverizer is also provided.

A hopper and a mineral material processing plant. The hopper includes hinged side walls configured to be pivoted into a first position and a second position and a connection wall attached between the hinged side walls. The connection wall includes a flexible member and is configured to fold together in response to the hinged side walls being pivoted from the first position to the second position.

A bearing cartridge and a retaining ring for a bearing cartridge arranged to support a rotatable main shaft of a vertical shaft impact (VSI) crusher. The retaining ring is formed as a single piece ring positionable radially between a drum forming part of a mainframe of the VSI crusher and a region of the main shaft of the crusher.

A counter-rotating pin mill for grinding food products includes a housing assembly comprising a first and a second housing part. A first and a second grinding shaft are arranged coaxially in the housing assembly on a grinding axis. A first grinding disk is arranged on an end of the first grinding shaft. A second grinding disk is arranged on an end of the second grinding shaft. The first and the second grinding disks are parallel to each other. A bearing device is formed by at least two slide assemblies arranged parallel with the grinding axis in the first housing part. The at least two slide assemblies comprises a slide bushing arranged in the first housing part and a slide axle guided in the slide bushing and being connected with the second housing part. The first and/or the second housing part is displaceable along the grinding axis via the bearing device.