A method of maintaining a grate of a grinding mill, the method comprising the steps of gripping a worn rotable segment comprising at least one grate support element provided with a mounting flange at the outer perimeter of the grate support element configured to mount the grate support element to a shell of the grinding mill, and at least one grate panel attached to the grate support element. The method further comprises unmounting, from the outside of the grinding mill, the mounting flange of the grate support element from the shell of the grinding mill, and lifting the unmounted worn rotable segment from the grinding mill.

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.

The present invention relates to a device for treatment of a material mixture consisting of substitute fuel and impurities, having a vertically aligned central feeder (1), a separating unit (2) arranged underneath the central feeder (1), a rotor mill (3), wherein the rotor mill (3) is arranged above the separating unit (2) and surrounds the central feeder (1), a flow device (4) for generating an upwardly directed gas flow, wherein the rotor mill (3) has a multistage design, and a respective separating device (6) is arranged between the stages (5.1, 5.2) of the rotor mill (3), wherein material mixture not held back by the separating device (6) is further comminuted in the following stage (5.2).

A method of treating and grading contaminated particulate material includes i. physically breaking up the particulate material to separate the particles thereof; ii. rinsing and grading the particulate material to separate the particulate material into an oversize fraction and an undersize fraction; iii. washing and grading the oversize fraction to produce one or more treated aggregate products; iv. passing the undersize fraction through a high shear washing process to separate contaminants therefrom; v. fluidising and cleaning the undersize fraction in a classification tank to produce one or more treated sand products at an underflow thereof by passing clean water upwardly into the classification tank. Optionally, waste water resulting from stages (ii), (iii) and (iv) is treated to form process water, a portion of which is used in stage (ii), a portion of the process water undergoing one or more further treatment processes to produce clean water used in stage (v).

The invention relates to a disintegrating device comprising a comb system (I), wherein the disintegrating device is formed by at least one disintegrating roller (1), rotatably mounted in a machine frame, with at least one disintegrating tool (2) arranged thereon, wherein the disintegrating device has at least one counter blade (3) that cooperates with the disintegrating tool (2), and comprising at least one base comb (II) on which the at least one counter blade (3) is arranged, and on which at least one sieve element (41) can be arranged as a component of a sieve device (4), wherein the sieve device (4) at least partially comprises the disintegrating roller (1) in the intended application. The invention is characterised in that the sieve element (41) is spring-mounted on the base comb (II).

Waste separator apparatus which comprises: -a frame (11) which delimits a separation chamber (12); -a screening mesh (13) which divides the separation chamber (12) into a shredding chamber (121) and a collection chamber (122); wherein the shredding chamber (121) has a loading mouth (123) and an unloading mouth (124); - a shredder shaft (14) fixed to the frame (11) in a rotatable manner about an operating axis (A) and extending into the shredding chamber (121). The shredder shaft (14) has first cutting hammers (15) and second expelling hammers (16); wherein the screening mesh (13) faces the first hammers (15), in order to receive shredded material, and the discharging mouth (124) faces the second hammers (16). The second hammers (16) have a front edge (17) which is rectilinear and extends substantially parallel to a radial direction (C) with respect to the operating axis (A).

The invention relates to a method for setting an operating state of at least one mobile mineral machining plant, in particular a mobile mineral material crusher (10), wherein a processing device (100) is provided, to which an input unit (90) is assigned, wherein at least one characteristic material value of the feed material (KM) to be machined is entered into the input unit (90), wherein at least one characteristic material value (KE) of at least one end material to be produced using the mineral machining plant is entered into the input unit (90), wherein a target machine parameter (SP) or a target machine parameter set containing several target machine parameters (SP) is generated in the processing device (100), taking into account the characteristic material value of the feed material (KM) to be machined and the characteristic material value of the end material (KE) to be produced, and wherein the at least one target machine parameter (SP) or the target machine parameter set is transferred to a control device (130) of the mineral machining plant and/or displayed on a display device. Such a process significantly facilitates adapting the mineral machining plant to changing crushing tasks for a machine operator.

A secondary shredder can include a rotor assembly that employs a modular rotor design. Each rotor of the rotor assembly can include a number of blades that are symmetrical around a horizontal and a vertical axis. Each rotor can include a number of radial extensions forming gaps into which the blades insert. The blades can be secured within the gaps by wedges that apply an inward force against the blades when the wedges are secured into the gaps. The radial extensions and blades can include keyways into which keys insert to prevent the blades from escaping the gaps. The secondary shredder may also include a stationary knife assembly that includes multiple stationary knives that are positioned on the same side of the rotor assembly.

A shredder includes a shredder box having first and second opposite end walls, and first and second opposite side walls that extend between the first and second end walls. The shredder further includes a shredder rotor positioned within an interior of the shredder box, an access door that is pivotally moveable, and a control system for monitoring various parameters to operate the shredder. A side access region is defined between the first and second end walls when the access door is in the open position. The side access region provides access to the shredder rotor and includes an open region defined between the first and second end walls at the second side of the shredder. The open region has an open top which is free of obstructions extending between the first and second end walls.

A device for comminuting media materials that store sensitive information. The device is a rotating mill core with removable flat edged blades, a set of stacked bed knives and a screen. The mill core rotates in close proximity to adjustable bed knives to shear the material being fed before passing through a screen in order to grate the material. The mill core has an angular positioned blade constructed and arranged to shear material with said bed knives. The mill core has a mass and is operated at 1000 rpm. A flywheel is further attached to the mill core in order to conserve rotational energy and improve the efficiency of the device. Vacuum ports facilitate cleanup.