The invention relates to a method for producing artificial crushed sand by means of a thermal treatment using sand in the form of fine sand (FS/FSa) and/or round sand as the starting material (1). The starting material (1) in variant A is heated to a melting temperature by bundling sun rays (13), and/or the starting material in variant B is heated to a melting temperature by using a conventional melting device which achieves its energy supply using converted or stored solar power, whereby each of a plurality of sand grains are melted together into a three-dimensional intermediate product (2). The intermediate product (2) produced in this manner is cooled and finally comminuted to a particle size of less than 2 mm in a comminuting process. An end product (3) is produced which differs from the starting material (1) with respect to the shape and surface roughness. The method offers a long-term solution for meeting the demand for crushed sand and provides sand for the construction industry.

A head for polishing ceramic manufactured articles or natural stones includes a main body and at least one work tool associated with the body for polishing ceramic manufactured articles or natural stones, and an air cooler for the tool.

Process for the realization of manufactured articles in stone material, characterized by comprising the following steps of: providing a block or flat sheet of said stone material, and gluing a support in a flexible material on a surface of said sheet, carrying out the cutting or sectioning of said sheet to obtain a laminated panel with a determined minimum thickness, carrying out the winding of the mentioned laminated panel on a roll or similar curved surface to obtain the crushing of said panel into irregular chunks or parts; carrying out the impregnation or spreading on said crushed panel with polymeric materials or thermosetting resins; recomposing the planarity of said impregnated panel thus obtained.

The invention relates to a method for producing artificial crushed sand by means of a thermal treatment using sand in the form of fine sand (FS/FSa) and/or round sand as the starting material (1). The starting material (1) in variant A is heated to a melting temperature by bundling sun rays (13), and/or the starting material in variant B is heated to a melting temperature by using a conventional melting device which achieves its energy supply using converted or stored solar power, whereby each of a plurality of sand grains are melted together into a three-dimensional intermediate product (2). The intermediate product (2) produced in this manner is cooled and finally comminuted to a particle size of less than 2 mm in a comminuting process. An end product (3) is produced which differs from the starting material (1) with respect to the shape and surface roughness. The method offers a long-term solution for meeting the demand for crushed sand and provides sand for the construction industry.