A base supports an inclined screen having a uniform mesh selected to remove larger aggregate from a first cement mixture to form a second cement mixture that passes through the screen. A powered vibrator vibrates the screen to separate the concrete mixtures and larger aggregate. Springs and/or dampers in support legs isolate the vibrating screen from the base. A guide frame on the top surface of the screen guides the first concrete mixture along the screen and guide the separated aggregate out a bottom opening into an aggregate container. A support frame on the bottom surface of the screen stiffens the screen to help support the weight of the concrete. A concrete container, preferably wheeled, is below the screen to collect the second concrete mixture and move it to its use location.

A system and method for separating granular particles according to particle size, and more particularly enhance ore grades by removing unwanted material. The system (10) comprises means (11) for transporting granular material (12) comprising multiple sized fractions with gradation of the particles according to particle size between relatively fine fractions and relatively coarse fractions, in a direction having a horizontal component; and subjecting the granular material (12) to vibration while being so transported to induce some separation of particles according to particle size. The system (10) further comprises means (13) for causing the granular material (12) to subsequently move as a granular flow (14) along a curved path (15) under the influence of gravity to further induce separation of particles according to particle size. The system (10) still further comprises means (16) for dividing the granular flow (14) moving along the curved path (15) into different streams (17) according to their trajectory.

A system and method for separating granular particles according to particle size, and more particularly enhance ore grades by removing unwanted material. The system (10) comprises means (11) for transporting granular material (12) comprising multiple sized fractions with gradation of the particles according to particle size between relatively fine fractions and relatively coarse fractions, in a direction having a horizontal component; and subjecting the granular material (12) to vibration while being so transported to induce some separation of particles according to particle size. The system (10) further comprises means (13) for causing the granular material (12) to subsequently move as a granular flow (14) along a curved path (15) under the influence of gravity to further induce separation of particles according to particle size. The system (10) still further comprises means (16) for dividing the granular flow (14) moving along the curved path (15) into different streams (17) according to their trajectory.

A mobile classifying or screening device, including frame for a classifying apparatus arranged on a chassis. The classifying apparatus has at least one screening surface for separating a fed screening material into at least two screened fractions. The frame includes two lateral frame parts which are formed of longitudinal bars running in the longitudinal direction, which are connected by webs running transversely to the longitudinal bars and which include a topmost longitudinal bar and a bottommost longitudinal bar. At least two transverse bars running in the the transverse direction, which interconnect the two lateral frame parts in the region of the respective bottommost longitudinal bars of the two lateral frame parts. The classifying apparatus is mounted on longitudinal bars and is adjacent to a storing and metering unit in the form of a trough-shaped feed channel having a substantially horizontal direction of discharge onto the screening surface.

A mobile classifying or screening device, including frame for a classifying apparatus arranged on a chassis. The classifying apparatus has at least one screening surface for separating a fed screening material into at least two screened fractions. The frame includes two lateral frame parts which are formed of longitudinal bars running in the longitudinal direction, which are connected by webs running transversely to the longitudinal bars and which include a topmost longitudinal bar and a bottommost longitudinal bar. At least two transverse bars running in the the transverse direction, which interconnect the two lateral frame parts in the region of the respective bottommost longitudinal bars of the two lateral frame parts. The classifying apparatus is mounted on longitudinal bars and is adjacent to a storing and metering unit in the form of a trough-shaped feed channel having a substantially horizontal direction of discharge onto the screening surface.

This application relates generally to a method and apparatus to deposit particles onto one or more coupons, and harvest particles from one or more coupons, which may beneficially provide a more uniform or localized distribution of particles over a specified area on each coupon. The application relates to a method and apparatus for depositing particles onto one or more coupons using a sieve. The application also relates to a method and apparatus for depositing particles onto one or more coupons using a dust storm. The particle loadings achieved on each coupon or across an individual coupon may be substantially uniform. The application further relates to a laser-based method and apparatus for transferring particles deposited at localized points on a source coupon to a different substrate for further use.

This application relates generally to a method and apparatus to deposit particles onto one or more coupons, and harvest particles from one or more coupons, which may beneficially provide a more uniform or localized distribution of particles over a specified area on each coupon. The application relates to a method and apparatus for depositing particles onto one or more coupons using a sieve. The application also relates to a method and apparatus for depositing particles onto one or more coupons using a dust storm. The particle loadings achieved on each coupon or across an individual coupon may be substantially uniform. The application further relates to a laser-based method and apparatus for transferring particles deposited at localized points on a source coupon to a different substrate for further use.

A sieving device is described. The sieving device includes an adjustable sieve surface that includes a first sieve surface and a second sieve surface. Openings are formed in each of the first sieve surface and the second sieve surface so as to define a shared pathways extending through the adjustable sieve surface. The shared pathways are defined by a length dimension that is greater than a width dimension. The width dimension can correspond to a cephalothorax width of an insect.

A sieving device is described. The sieving device includes an adjustable sieve surface that includes a first sieve surface and a second sieve surface. Openings are formed in each of the first sieve surface and the second sieve surface so as to define a shared pathways extending through the adjustable sieve surface. The shared pathways are defined by a length dimension that is greater than a width dimension. The width dimension can correspond to a cephalothorax width of an insect.

There are provided hoppers for separating slack from a mixture of product and slack, and systems and method using such hoppers. Each hopper comprises: an internal gate configured to prevent the passage of product therethrough, but to allow the passage of slack therethrough; and, an external gate configured to prevent the passage of product and the passage of slack therethrough; the internal gate and the external gate being moveable between respective open and closed positions; the hopper configured such that: when the internal gate and external gate are in their respective closed positions and the mixture is introduced into the hopper, product is retained by the internal gate whilst slack passes through the internal gate and is retained by the external gate; and, when the external gate and internal gate are each in their respective open positions, product may exit the hopper along a first path.