A conveying and conditioning roller for a harvesting machine is provided on the surface thereof with teeth in the form of toothed strips which extend over the longitudinal extent of the roller and in each case have a leading tooth flank and a trailing tooth flank as well as a tooth edge. The roller is provided with wear protection zones continuously or in partial regions, the wear resistance thereof being greater than that of the material of the base body of the roller. The base body has a tooth structure determining the shape of the teeth and tooth wear protection zones are formed on the trailing tooth flanks by a high energy radiation process, substantially maintaining the geometry of the tooth structure, roller wear protection zones being formed together thereby on the rollers, as well as a method for producing such a roller wear protection zone.

A wear-resistant body for crushing particulate material in the cement or mineral industries includes a body (1) provided with a plurality of highly wear-resistant inserts (3) embedded in complementary recesses (2) provided in the surface region (6) of the body. A ductile attachment part (4) is arranged within each recess (2), the ductile attachment part (4) being deformable by elastic or plastic deformation and the highly wear-resistant insert (3) being secured in the recess (2) by the ductile attachment part (4) after deformation. In some embodiments the ductile attachment part (4) is in the form of a ring or sleeve. A method for producing such a wear-resistant body is also provided.

A comminuting device (10) has a wear-resistant element (16) for partial insertion into a recess (26) in the surface of a wear area (12, 14). The wear-resistant element (16) has a fastening region (24), which can be connected to the recess (26) in the surface of the wear area (12, 14), and a wear region (22), which protrudes at least partially from the surface of the wear area (12, 14). The fastening region (24) is formed from a metal, the wear region (22) has a shell (18) and a core (20) arranged inside the shell (18). The core (20) is formed from a metal and the shell (18) is formed from a ceramic (20). The material of the shell comprises a ceramic which contains yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ). The TPZ has a proportion of the ceramic by volume of at least 60%, preferably at least 80%, in particular 95% to 100%.

A roller crusher having two parallel rollers that rotate in opposite directions and are separated by a gap. At least one of the rollers has a flange at an end thereof. The roller crusher includes a material removal device having a rotatable cutter unit with a plurality of cutter elements arranged tangentially about the rotatable cutter unit at a radial distance from a rotational axis for the rotatable cutter unit. A rotation device rotates the rotatable cutter unit at an end of a roller having a flange. When the cutter unit is rotated by the rotation device, the cutter unit at least partially cuts away material accumulated on the flange and/or on the envelope surface at an end portion of the roller adjacent the flange. Each cutter elements presents an impact surface that faces the material to be cut away and is a polycrystalline diamond (PCD).

The invention relates to a wear-resistant roller for crushing of particulate material, such as crude ore for use in the cement or minerals industry comprising a roller body, a wear surface on the roller body. The wear surface comprises welding beads comprising a primary fraction of carbide material and a secondary fraction of material selected from the group consisting of Nickel, Nickel alloys, mixtures of Nickel and Nickel alloys and mixtures of Nickel containing refractory hard materials, Cobalt, Cobalt alloys, mixtures of Cobalt and Cobalt alloys and mixtures of Cobalt containing refractory hard materials. Furthermore, the welding beads are welded to the roller body in an overlapping manner such that two neighbouring welding beads comprise an overlapping volume and a non-overlapping volume, the overlapping volume being an intersection volume between the two neighbouring overlapping welding beads, and the fraction of carbide material being higher in the overlapping volume than in the non-overlapping volume such that the overlapping volume has a higher wear resistance compared to the non-overlapping volume having a lower wear-resistance. Also the invention relates to a method of forming such a wear surface on a roller body.

The present invention relates to a method and system for beneficiation. In particular, it relates to the recovery of alloys, metals, and minerals from mining and process waste, for example, the recovery of ferrochrome (FeCr) from less desirable materials. A product produced by a method of beneficiation discloses comprises a chrome concentrate of 95% chrome units.

The invention relates to a wear-resistant roller for crushing of particulate material, such as crude ore for use in the cement or minerals industry comprising a roller body, a wear surface on the roller body. The wear surface comprises welding beads comprising a primary fraction of carbide material and a secondary fraction of material selected from the group consisting of Nickel, Nickel alloys, mixtures of Nickel and Nickel alloys and mixtures of Nickel containing refractory hard materials, Cobalt, Cobalt alloys, mixtures of Cobalt and Cobalt alloys and mixtures of Cobalt containing refractory hard materials. Furthermore, the welding beads are welded to the roller body in an overlapping manner such that two neighbouring welding beads comprise an overlapping volume and a non-overlapping volume, the overlapping volume being an intersection volume between the two neighbouring overlapping welding beads, and the fraction of carbide material being higher in the overlapping volume than in the non-overlapping volume such that the overlapping volume has a higher wear resistance compared to the non-overlapping volume having a lower wear-resistance. Also the invention relates to a method of forming such a wear surface on a roller body.

A breaker tooth assembly for a mineral breaker, a drum assembly including such a breaker tooth assembly and a mineral breaker with such a breaker tooth assembly or drum assembly are described. The breaker tooth assembly including a horn protrusion extending from a rotatable support, the horn protrusion having a pair of opposed front and rear faces; and a shell structure encapsulating the horn protrusion and defining the outer shape of the breaker tooth; wherein the shell structure comprises a plurality of covers which are non-releasably secured to one another, but not to the horn protrusion, to define a unitary breaker tooth assembly; and wherein at least one cover of the shell structure is releasably connectable with a corresponding face of the horn protrusion.

A method for making recesses in the surface of a roller for a rolling press. A thermal treatment is applied to a cylindrical roller surface by heating the surface in a region of the desired recesses until the material properties of the roller surface change permanently, i.e., even after cooling, with respect to the hardness of the roller material. The thermally treated regions produce a softer material in those regions than in the surrounding surface of the roller. By virture of a first start-up of the rolling press with abrasive material to be comminuted, the desired profiling is formed spontaneously due to a wearing down of the soft regions to form the desired recesses. The thermal treatment represent a particularly simple and cost-effective method for profiling rolling rollers, and in particular, rolling rollers which have already become worn, which that thereby be readily refurbished.

A material reduction system and processing tool for a material processing machine. The material reduction system comprises a tool holder fixedly mounted to a rotary drum. A leading member defines a raker surface oriented away from the operating direction at a first predefined angle. A processing tool is removably coupled to the tool holder. A leading face of the processing tool is oriented toward the operating direction at a second predefined angle. The first and second predefined angles are such that material is directed into contact with the reducing member to limit material contact with the tool body and the tool holder. An upper flange of the processing tool directly abuts the tool holder to direct material away from the tool holder. The upper flange and a lower flange define a tool recess configured to receive a projection from the tool holder to prevent rotation of the processing tool.