In a method for detaching a frozen charge from an inner wall of a grinding tube of a tube mill, a motor of a drive system is operated in a first mode to rotate the grinding tube for grinding. In a second mode, the motor of the drive system is operated to remove the frozen charge from the inner wall of the grinding tube such that operation of the motor to effect a rotational movement of the grinding tube is repeatedly disturbed by a disturbance signal to cause a repeated disturbance within a variable time interval, with the time interval of the repeated disturbance being shortened.

The present invention relates to a method for producing tetrahydridoborate salts with high efficiency at low cost. The method for the production of metal borohydride salts according to the present invention comprises the steps of providing an anhydrous metal borate salt and milling the anhydrous metal borate salt in the presence of a metal material based on magnesium or magnesium alloys in a hydrogen atmosphere at a temperature and for a time sufficient to produce the metal borohydride salt. In another embodiment of the invention, the method for the production of metal borohydride salts according to the present invention comprises the steps of providing an hydrated metal borate salt and milling the hydrated metal borate salt in the presence of a metal material based on magnesium or magnesium alloys in an inert gas atmosphere at a temperature and for a time sufficient to produce the metal borohydride salts. In a still further embodiment of the invention, the metal material based on magnesium or magnesium alloys is a secondary magnesium material, preferably a Class 2, Class 3, or Class 6 secondary magnesium material.

An apparatus for separating material includes a frame and a rotatable sleeve supported by the frame. The sleeve has a first end, a second end, and a wall with a plurality of apertures to permit material smaller than a first size to fall through the apertures. A source of forced air is arranged to force air through an interior of the sleeve.

A continuous feed machine for trimming and separating plant material, the machine having one or more augers or conveyors for feeding plant material into a trommel barrel covered with mesh netting, adapted to include baffles between longitudinal sections of the trommel barrel, and sized for rotational speeds to so as to process the plant material as components of the plant material progress longitudinally through successive sections of the trommel barrel. The mesh netting trims plant material as it moves through the trommel barrel, with the trim falling through the mesh netting. One or more augers or conveyors may be used to remove trimmed plant material exiting an output end of the trommel barrel, and one or more augers or conveyors may be used to remove trim material from below one or more sections of the trommel barrel.

A lifting wall arrangement at an end wall of a drum mill, having a plurality of segments which are removably installable on the end wall. Each segment includes an inner wall and an opposing outer wall. At least one lifting blade is arranged on the outer wall, such that the outer wall, the lifting blade and the inner wall define a discharge channel leading to a discharge cone. The inner wall forms a part of a sieving wall in the drum mill. Each segment constitutes an integrated unit adapted to be installed on the end wall. Other embodiments include a segment of a lifting wall arrangement and a drum mill having a lifting wall arrangement.

An agitator ball mill comprises agitating discs (18) on an agitating shaft, wherein two adjacent agitating discs (18) are bounding a grinding cell, respectively. The agitating discs (18) comprise grinding material passage openings (28) which are only arranged in the immediate proximity of a grinding chamber inner boundary (19), which connect adjacent grinding cells, and which have a radially outer boundary that has a distance R28 starting from the grinding chamber inner boundary (19) in the radial direction of the agitating disc (18). For the ratio of the distance R28 of the radially outer boundaries of the grinding material passage openings (28) to a radial extension R18 of the agitating discs (18), the following condition applies: 0.05.Math.R18R280.25.Math.R18. Otherwise the agitating discs (18) are closed.

In a method of making a lifter bar for use in a grinding mill, a refurbished lifter bar and a mould for producing the refurbished lifter bar, the lifter bar has a predetermined form and has a base member, and the method includes providing a mould having an interior space that conforms at least partially to the predetermined form, joining the mould and the base member together to form a cavity defined by the base member and the interior space, and filling the cavity with polymer and allowing the polymer to attach to the base member to construct a lifter bar having the predetermined form.

In a method of making a lifter bar for use in a grinding mill, a refurbished lifter bar and a mould for producing the refurbished lifter bar, the lifter bar has a predetermined form and has a base member, and the method includes providing a mould having an interior space that conforms at least partially to the predetermined form, joining the mould and the base member together to form a cavity defined by the base member and the interior space, and filling the cavity with polymer and allowing the polymer to attach to the base member to construct a lifter bar having the predetermined form.

A pulp lifter has a leading edge and a trailing edge with respect to rotation of a rotary grinding mill, and includes a first wall bounding an interior space and a second wall dividing the interior space into first and second regions. The first wall includes an inner edge wall section and a radially outer wall section. The second wall includes a guide that extends substantially from the radially outer wall section to a trailing edge of the inner edge wall section. The guide is configured such that the second end of the guide does not extend to a radially inner edge of the pulp lifter. The first and second walls form at least one inlet opening at the leading edge providing access to the second section and an outlet opening for discharge of slurry from the second section at the radially inner edge and the trailing edge.

Processor apparatus for collecting material adhering to surfaces of packages for processing as waste. The processor apparatus includes a cylindrical drum that is rotatable about a longitudinal axis and provided with orifices to form a screen that retains the packages while allowing the material for collecting to pass through; and motor device for driving the rotary drum in rotation. The processor apparatus also includes an unclogging device for at least partially unobstructing the orifices while the cylindrical drum is rotating.