Dewatering Screens

Various minerals are found in nature either in a dispersed state, where they exist as separate entities, such as native gold particles in silica rock, or in a combined form, where they are bound within a host rock. Dry material separations using screens and sieves are typically attempted down to particle sizes of about 75 microns. Finer materials have a tendency to block the sieve openings. In such cases, screening in the presence of water can be helpful. Separating even finer-sized materials becomes challenging using traditional sieves. For such fine materials, alternative processes like classification need to be employed. Screen Types: * Grizzly Screens * Inclined Vibrating Screens * Horizontal Vibrating Screens * Dewatering Vibrating Screens Novelty Structures supplies various type of Screens for Mineral Processing Plants.

Grizzly screens are typically constructed by welding steel rails, rods, or bars into grids with a specific pattern. The selection of rails can vary in size, ranging from about 7.4 kg/m to approximately 225 kg/m. These rails generally run parallel to each other along the entire length of the screening surface. The spacing between the rails typically range from 5 to 200 mm. To facilitate the smooth flow of materials, the openings are often tapered, with the top being wider than the bottom. Heavy-duty grizzly bars are commonly cast from manganese steel and feature double tapers. These grizzly screens are designed to receive large lumps of ore from sources such as railroad wagons, tipper cars, and other bulk material handling systems that discharge materials from considerable heights. As a result, they are constructed to be exceptionally robust to withstand the impact and handling of heavy materials.

The distinctions among various jig types is related to the methods employed for generating pulsation and the manner in which the heavy fraction is extracted from the jig. The screen’s role is to provide support to the particle bed, and the space beneath it is referred to as the hutch. Typically, the tank is divided into two primary sections: one housing the support screen with the ore bed and another responsible for generating the fluid flow. The heavy discharge from the jig can exit in two ways: either passing through the screen or flowing over the screen. When employing jigging through the screen, every particle in the input is smaller than the screen openings, allowing them to potentially fall through the screen and gather in the hutch. Novelty Structures supplies Mining Jigs for various materials.

A screw feeder is primarily designed for handling very low-tonnage outputs, with a critical requirement for positive and controlled material discharge. This type of feeder offers the advantage of easy enclosure, making it effective at preventing the release of dust. Consequently, it allows for a sealed hopper and chute arrangement from the hopper to the delivery point. The basic structure of a screw feeder includes a helical screw that rotates below the hopper outlet and is driven by an external power source. The screw can have a fixed pitch or a variable pitch with smaller spacings in the rear and gradual increases in pitch towards the discharge end. This design ensures that the material moves efficiently within the rear portion of the hopper. Novelty Structures supplies various type of Feeders for Mineral Processing Plants. * Belt Feeders * Screw Feeders * Apron Feeders * Rotary Table Feeders