The present invention relates to a method for producing aggregates from concrete residues which are not used for construction purposes or, more generally, from cement mixtures which are unused for any reason and returned to the production facility in the truck mixer. The present invention also relates to the material obtained by said process and its use as an aggregate for concrete production or other applications.

A cyclonic separation and materials processing method and system is presented in which materials entry at one end and which is arranged so that the materials that enter will be given a tangential velocity component as they enter. Specific embodiments include a three-dimensional sorting system with the use of an outward centrifugal motion and up/down (or vertical) motion flow of water or other media, which can be thought of as a three-dimensional separation.

A control method of a treatment plant for elements to be recycled or disposed of, which includes a crushing roll adapted to reduce the size of the elements to be recycled or disposed of and a screen provided with one or more rotary shafts adapted to generate its vibration and operatively arranged upstream of the crushing roll to enable passage to the crushing roll only of elements having a size larger than a predetermined size, includes a measuring step of the vibration intensity of the screen; a comparing step of the measured vibration intensity to a desired value; and an increasing step of the rotation speed of the rotary shafts of the screen to increase the vibration intensity in case differences between the measured and desired vibration intensities exceed a predetermined threshold value.

A concrete recovery or reclamation device including an entry hopper at an inlet end of the device, at least one screen conveyor inclined upwardly away from the inlet end, at least one vibratory device to cause vibration of the at least one screen conveyor, a liquid dispersion system to disperse liquid over the at least one screen conveyor, a collection sump to collect charged wash liquid, at least one wash liquid outlet from the sump, and at least one reclaimed aggregate material outlet from each at least one screen conveyor.

A control method of a treatment plant for elements to be recycled or disposed of, having a crushing roll to reduce the size of the elements to be recycled or disposed of, and a screen operatively arranged upstream of the crushing roll to enable passage therethrough only of elements having a size larger than a predetermined size, includes the steps of measuring the current absorbed by the crushing roll; comparing the measured current value to a first predetermined value; and reducing the vibrations of the screen, if the measured current exceeds the first predetermined value.

A control method of a treatment plant for elements to be recycled or disposed of, which includes a crushing roll adapted to reduce the size of the elements to be recycled or disposed of, a screen operatively arranged upstream of the crushing roll and adapted to enable passage therethrough only of elements to be recycled or disposed of having a size larger than a predetermined size, and a conveyor belt arranged operationally upstream of the screen to provide the screen with the elements to be recycled or disposed of, includes a measuring step of the volume of material lying on the conveyor belt; a comparing step of the measured volume value to a first predetermined value; and an increasing step of the vibration intensity of the screen if the measured volume value exceeds the first predetermined value.

Plants and methods recover spent refractory material and comprise at least one receiving area for said refractory material, at least one material sieving area, at least one magnetic separation area, and at least one sorting area. Said receiving area communicates with a first sieving area divides said refractory material in at least two fractions based on sizes of said refractory material. A second sieving area divides a fine fraction into at least two sub-fractions.

A cyclonic separation and materials processing method and system is presented in which materials entry at one end and which is arranged so that the materials that enter will be given a tangential velocity component as they enter. Specific embodiments include a three-dimensional sorting system with the use of an outward centrifugal motion and up/down (or vertical) motion flow of water or other media, which can be thought of as a three-dimensional separation.

The present disclosure relates to the treatment of streams derived from construction and/or demolition (C&D) debris, such as C&D fines streams, asphalt shingles, drywall, or wood. The process can include a kinetic pulverization stage through a kinetic pulverizer where the frangible materials are size-reduced and the ductile materials are liberated and remain as an oversized fraction. The feedstock can include infrangible materials that also remains as an oversized fraction. The pulverized material is then subjected to a separation stage, which may include mechanical and/or magnetic screening, to separate the oversized material comprising the ductile material, and optionally larger particles of the infrangible material, from the size-reduced material comprising the frangible material, and optionally small particles of infrangible material.

Plant for the recovery of spent refractory material in steel plants, comprising at least one receiving area (1) for said refractory material, at least one material sieving area (2), at least one magnetic separation area (3) and at least one sorting area (4).

Said receiving area (1) communicates with a first sieving area (2) comprising first sieving means intended to divide said refractory material in at least two fractions, of which a coarse fraction and a fine fraction, on the basis of the size of said material.

There is further provided a second sieving area (21) comprising second sieving means intended to divide said fine fraction into at least two further sub-fractions (A, B, C) on the basis of size.