A crushed polycrystalline silicon lump is provided in which a surface metal concentration is 15.0 pptw or less and preferably 7.0 to 13.0 pptw, and in the surface metal concentration, a surface tungsten concentration is 0.9 pptw or less and preferably 0.40 to 0.85 pptw, and a surface cobalt concentration is 0.3 pptw or less and preferably 0.04 to 0.08 pptw.

There is provided an impact grinding assembly. The assembly, according to one aspect, includes a pair of conveyors for conveying at least partially unground material. Each conveyor has a lower portion and an upper portion which is spaced-apart above its lower portion. The assembly includes a pair of vibrating impact plates aligning below the upper portions of respective ones of the conveyors to receive the at least partially unground material. A first one of the impact plates operatively directs material thereon to the lower portion of a second one of the conveyors. A second one of the impact plates operatively directs material thereon to the lower portion of a first one of the conveyors. The impact grinding assembly may further include a material-separation assembly for removing material from the conveyors which has a particle size no greater than a desired particle size.

A device for comminuting ore and/or slag is contemplated. The device may be comprising an ore feeding unit for feeding ore which is to be comminuted to a first pulverizer, said first pulverizer being composed of at least of two comminuting elements which can be moved relative to each other, said elements forming together at least one comminuting space for the ore which is to be comminuted, such that, by a relative movement in the form of a rotation about the rotational axis of at least one of the two comminuting elements the ore which is to be comminuted is at least partially pulverized. One or more accelerating elements, in particular protrusions, are provided on at least one of the comminuting elements, said accelerating elements being arranged in particular on the end face of at least one of the two comminuting elements and accelerating and comminuting the ore to be comminuted by the rotation of one of the two comminuting elements. An intermediate space is provided between the two comminuting elements and/or in at least one of the two comminuting elements, through which space the pulverized ore, during the rotation, is transported from the center of rotation toward the outside and away from the two comminuting elements. At least one of the two comminuting elements is operatively connected to a hydraulic spring pressure device, said hydraulic spring pressure device being designed such that the comminuting element to which it is operatively connected is variably resiliently mounted in the direction of the other comminuting element depending on an adjustable hydraulic spring pressure control unit.

Methods for producing a purified wheat embryo product are disclosed. In one embodiment, producing a purified wheat embryo product includes the steps of: accelerating a plurality of wheat berries toward an impact surface, impacting each of the plurality of wheat berries against the impact surface, dislodging at least some of the wheat embryos from the wheat berries in response to the impacting step such that the dislodged embryos are intact, and separating the dislodged wheat embryos from the bran and the endosperm to produce an intermediate purified wheat embryo product.

Ore rock is disintegrated into extremely fine rock fraction in a slurry by subjecting the slurry in selective orders of application of excitation forces and energy to cause spontaneous cavitation to occur in the slurry. The excitation forces and energy are provided by electrodynamic discharges, hydrostatic force, hydrodynamic energy, and sonic vibrations.

Methods for producing a purified wheat embryo product are disclosed. In one embodiment, producing a purified wheat embryo product includes the steps of: accelerating a plurality of wheat berries toward an impact surface, impacting each of the plurality of wheat berries against the impact surface, dislodging at least some of the wheat embryos from the wheat berries in response to the impacting step such that the dislodged embryos are intact, and separating the dislodged wheat embryos from the bran and the endosperm to produce an intermediate purified wheat embryo product.

A crushed polycrystalline silicon lump is provided in which a surface metal concentration is 15.0 pptw or less and preferably 7.0 to 13.0 pptw, and in the surface metal concentration, a surface tungsten concentration is 0.9 pptw or less and preferably 0.40 to 0.85 pptw, and a surface cobalt concentration is 0.3 pptw or less and preferably 0.04 to 0.08 pptw.

The invention regards to a device for comminuting ore and/or slag, which comprises an ore feed unit for feeding ore to be comminuted to a first comminuting means. The first comminuting means being composed of at least two comminuting elements that can be moved relative to each other, which elements form at least one comminuting space for the ore to be comminuted with each other such that, by a relative movement in the form of a rotation around the rotational axis of at least one of the two comminuting elements. The ore to be comminuted is pulverised in that one or more accelerating elements, in particular protrusions, are provided on at least one of the comminuting elements. The accelerating elements being arranged in particular on the end face of one of the two comminuting elements and accelerating and comminuting the ore to be comminuted by the rotation of one of the two comminuting elements. Between the two comminuting elements and/or in at least one of the two comminuting elements, an intermediate space is provided through which during the rotation the pulverised ore can be conveyed away outwards from the centre of the rotation and from the two comminuting elements. An outlet unit for outletting ore comminuted by the first comminuting means is provided which is connected to the intermediate space. The outlet unit is connected with a separating means, by means of which the comminuted ore is separated into two portions. A first portion of the comminuted ore comprises a particle size, which is essentially larger as a predefined particle size of a second portion of comminuted ore. The first portion of the comminuted ore is guided to the first comminuting means or to a second comminuting means and the second portion of the comminuted ore is guided to a floation means.

Methods for producing a purified wheat embryo product are disclosed. In one embodiment, producing a purified wheat embryo product includes the steps of: accelerating a plurality of wheat berries toward an impact surface, impacting each of the plurality of wheat berries against the impact surface, dislodging at least some of the wheat embryos from the wheat berries in response to the impacting step such that the dislodged embryos are intact, and separating the dislodged wheat embryos from the bran and the endosperm to produce an intermediate purified wheat embryo product.

Ore rock is disintegrated into extremely fine rock fraction in a slurry by subjecting the slurry in selective orders of application of excitation forces and energy to cause spontaneous cavitation to occur in the slurry. The excitation forces and energy are provided by electrodynamic discharges, hydrostatic force, hydrodynamic energy, and sonic vibrations.