Implementations of mechanical screening systems may include a first trommel screen rotatably coupled within a second trommel screen, the second trommel screen including a first plurality of openings and a second plurality of openings, each opening of the first plurality of openings smaller than each opening of the second plurality of openings. The mechanical screening systems may also include an outer barrel coupled to the second trommel screen. The outer barrel may include a first slot opening and a second slot opening therein. The second trommel screen may be rotatable.

Implementations of mechanical screening systems may include a first trommel screen rotatably coupled within a second trommel screen, the second trommel screen including a first plurality of openings and a second plurality of openings, each opening of the first plurality of openings smaller than each opening of the second plurality of openings. The mechanical screening systems may also include an outer barrel coupled to the second trommel screen. The outer barrel may include a first slot opening and a second slot opening therein. The second trommel screen may be rotatable.

A reactor system has a number of stations arranged to recover mineral particles in a slurry. The system includes a hopper to receive the slurry and barren media having hydrophobic coating to attract the mineral particles. The hopper provides a mixture of barren media and slurry to a tumbler arranged to stir the mixture in order to increase the contact between the slurry and the barren media so as to allow the mineral particles to attach to the barren media to form mineral laden media. The mineral laden media are conveyed to a rinsing station where water jets are used to wash the gangue materials off the mineral laden media. The rinsed mineral laden media are mixed with a surfactant so that the mineral particles are released from the mineral laden media. High-pressure water and air jets are then used to remove remaining surfactant from the released media.

A reactor system has a number of stations arranged to recover mineral particles in a slurry. The system includes a hopper to receive the slurry and barren media having hydrophobic coating to attract the mineral particles. The hopper provides a mixture of barren media and slurry to a tumbler arranged to stir the mixture in order to increase the contact between the slurry and the barren media so as to allow the mineral particles to attach to the barren media to form mineral laden media. The mineral laden media are conveyed to a rinsing station where water jets are used to wash the gangue materials off the mineral laden media. The rinsed mineral laden media are mixed with a surfactant so that the mineral particles are released from the mineral laden media. High-pressure water and air jets are then used to remove remaining surfactant from the released media.

A classifier and concentrator sluice apparatus with recirculating water in a self contained unit for classifying, concentrating, and washing rocks, minerals, gems, and ore. The unit includes a water reservoir and water circulation system in a drum or a barrel or other container. The barrel includes an open top end and a water circulating pump and water supply lines for circulating water from the reservoir into a basin containing a colander having a selected mesh for separating aggregates by size. The tails including suspended solids and waste aggregate accumulate in the bottom of the tub for disposal.

A classifier and concentrator sluice apparatus with recirculating water in a self contained unit for classifying, concentrating, and washing rocks, minerals, gems, and ore. The unit includes a water reservoir and water circulation system in a drum or a barrel or other container. The barrel includes an open top end and a water circulating pump and water supply lines for circulating water from the reservoir into a basin containing a colander having a selected mesh for separating aggregates by size. The tails including suspended solids and waste aggregate accumulate in the bottom of the tub for disposal.

A system and method for recovering metals from a waste stream includes or uses a feeder, a first screw separator, a slurry tank, and a second screw separator configured to receive carrier fluid and particles from the slurry tank. The method and system can include feature to improve water usage.

A system and method for recovering metals from a waste stream includes or uses a feeder, a first screw separator, a slurry tank, and a second screw separator configured to receive carrier fluid and particles from the slurry tank. The method and system can include feature to improve water usage.

A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers includes measuring an average LF fiber length at one or more locations post-fractionation, and maintaining the average LF fiber length within a target variability range by automatically altering a rotational speed of a rotor of the fiber fractionation system.

A method for controlling a fiber fractionation system for fractionating an input material into a long fraction (LF) stream comprising LF fibers and a short fraction (SF) stream comprising SF fibers includes measuring an average LF fiber length at one or more locations post-fractionation, and maintaining the average LF fiber length within a target variability range by automatically altering a rotational speed of a rotor of the fiber fractionation system.