A roller mill module with a fixed grinding roller with a first grind surface rotatably supported within a grind area between a first drive end and a second drive end of a support structure; an adjustable grinding roller with a second grind surface rotatably supported within the grind area; the adjustable grinding roller movable with respect to the fixed grinding roller to adjust a grind gap between the first grind surface and the second grind surface; a drive shaft of the fixed grinding roller and a drive shaft of the adjustable grinding roller extending from the first and the second drive ends of the support structure; and a sample port provided in a front side of the support structure; a sample passage coupled to the sample port extending to a position below the grind area and opposite a sampler stop surface.

A cracker roller disc has a first portion radially outward of the centre of substantially constant thickness, and a second portion radially outward of the first portion which second portion tapers towards the periphery of the disc. A plurality of upstanding ridges extending radially outward across the second portion on opposed faces of the disc are machined to define respective conical surfaces forming radially extending edges on opposed faces of the disc. The disc is provided with one or more circular or spiral grooves which cut across the edges in a substantially perpendicular direction to the edges. The grooves extend the effective length of each edge.

A tooth is made from a casting of one material. The tooth includes a working surface having a first edge and a second edge. The first edge has at least three teeth. The second edge also has at least three teeth. The working surface is provided with a welded overlay or a hardfaced welded overlay. The tooth can be attached to a mount on a rotating drum. The tooth is removably attached to the drum so that when it wears it can be replaced with another tooth. The rotating drum is part of a fragmenting machine.

A tooth is made from a casting of one material. The tooth includes a working surface having a first edge and a second edge. The first edge has at least three teeth. The second edge also has at least three teeth. The working surface is provided with a welded overlay or a hardfaced welded overlay. The tooth can be attached to a mount on a rotating drum. The tooth is removably attached to the drum so that when it wears it can be replaced with another tooth. The rotating drum is part of a fragmenting machine.

An environment-friendly construction waste treatment equipment for civil engineering is provided, including a main frame, a wringing frame, first fixing columns, a second fixing column, an electric motor, etc. wherein the first fixing column is provided on each of front and rear sides of a left side of an upper portion of the main frame, the wringing frame is provided between the first fixing columns, the second fixing column is provided on rear and left sides of the upper portion of the main frame, and the electric motor is provided on the second fixing column. The electric motor is turned on, the wringing wheels wring the construction waste, the wringed construction waste falls onto the conveying belt, and then is transferred to the filtering plate via the conveying belt. In this way, as the construction waste is conveyed via the conveying belt, the equipment is prevented from being blocked.

An environment-friendly construction waste treatment equipment for civil engineering is provided, including a main frame, a wringing frame, first fixing columns, a second fixing column, an electric motor, etc. wherein the first fixing column is provided on each of front and rear sides of a left side of an upper portion of the main frame, the wringing frame is provided between the first fixing columns, the second fixing column is provided on rear and left sides of the upper portion of the main frame, and the electric motor is provided on the second fixing column. The electric motor is turned on, the wringing wheels wring the construction waste, the wringed construction waste falls onto the conveying belt, and then is transferred to the filtering plate via the conveying belt. In this way, as the construction waste is conveyed via the conveying belt, the equipment is prevented from being blocked.

A gyratory roller crusher in which the rollers have a corrugated profile and at least one of the rollers is eccentrically mounted to give a relative gyratory motion to the rollers resulting in additional breakage mechanisms for the comminution of a very wide range of feed material, vastly improved crushing ratios and increased throughput compared with conventional roller crushers.

A gyratory roller crusher in which the rollers have a corrugated profile and at least one of the rollers is eccentrically mounted to give a relative gyratory motion to the rollers resulting in additional breakage mechanisms for the comminution of a very wide range of feed material, vastly improved crushing ratios and increased throughput compared with conventional roller crushers.

A preparation of niobium nanoparticles, its use, and a process for obtaining it by comminution, that is, a top-down process. The preparation of nanoparticles has a particular composition, purity, granulometric profile, and specific surface area, being useful in a variety of applications. Also taught is a process for obtaining nanoparticles of mineral species containing Niobium, through controlled comminution and without chemical reactions or contamination with reagents typical of the synthesis of nanoparticles. The preparation of niobium nanoparticles provides the large-scale production of niobium pentoxide nanoparticles with high purity, determined granulometric profile and very high specific surface area, enabling its use in practice in several industrial applications.

The invention relates to a method for comminuting fertiliser slugs or slug pieces in a two-roll mill (3) in the course of producing granular fertiliser material, wherein the two-roll mill (3) has two rotatingly driven grinding rolls, the roll surfaces of which are provided with a profiling, wherein the slug or slug pieces is/are placed on the two-roll mill (3) and comminuted into granular material in the roll nip formed between the grinding rolls, wherein the grinding rolls rotate at a circumferential speed of more than 5 m/s. This e method is characterised in that the surfaces of the grinding rolls are cooled during operation.