In the early 1900s, electrostatic separation became popular in mineral processing, until the advent of froth flotation. Since then, mineral processing has moved towards eco-sustainable processing techniques (ie, reducing the use of chemicals) and more recently, without the use of water. The electrostatic separation of minerals highlights the significance of a dry state. Electrostatic separation is a process that uses electrostatic charges to separate crushed particles of material. These methods separate valuable minerals from gangues using differences in their electrical properties. Particles of different electrical charges or polarities are separated in an electric field because they follow different motion trajectories. This way, valuable material is separated from ore or slag. In general, electrostatic separators are classified as electrodynamic (high tension) rollers and electrostatic plate separators. The chemical composition of the particle surface affects electron affinity, resulting in significant differential charging of materials in a mixture of discrete particles of diverse composition. The electrostatic plate separators work by passing a stream of particles past a charged anode. In high tension rollers, a corona discharge charges the particles that subsequently travel on a drum. The conducting particles lose their electrons to the drum and are then repelled from the drum; the drum attracts non-conducting particles. These separators have a low load capacity (less than a hundred kilograms per hour). These are useful for particles between 75 and 250 microns, which does not aid the separation of minerals due to the size of the ore particles. For example, the Quadrant Roller Electrical Sorter is a significant piece of equipment in electrical mineral separation. The disadvantage of the roller type is a limitation for separating small particles. However, in 1989, Massachusetts Institute of Technology(MIT) developed a belt-type separator that works with triboelectricity (charge separation by friction). This separator works for micron-sized particles and has a large separation capacity of 5 tonnes per hour, but the unit cost is several million USD. For this reason, Avimetal has developed low-cost electrostatic separators. The advantages of this system compared to our competitors are compact size, low sales price, the ability to separate micron-sized particles, large production capacity and low power usage. They also have several advantages over other mineral processing techniques due to their high efficiency, low capital and operating costs, no addition of chemicals and consequently, being environmentally friendly. Avimetal is a technology leader providing dry concentration, milling and non-cyanide leaching systems without wastewater generation. Avimetal’s dry concentration technology was first successfully commercialized in Quilabamba, Peru, by Picchu Rio Gold Inc. The company’s mining permit had been suspended since 2012 as a result of mercury and cyanide poisoning of water downstream of the Amazon River. Picchu Rio Gold was granted a processing permit in 2018 after the Peruvian government approved an EPA (Environmental Protection Agency) rule permitting the use of Avimetal’s technology. 

Avimetal’s electrostatic separator works with triboelectricity and has four stages of graphene-coated anode and cathode plate pairs, vertically positioned, capable of treating five tonnes per hour. Graphene is a material with the advantages of superior conductivity and low costs. We also offer a full knock down (FKD) kit, with which the machine can be assembled in a few hours. Furthermore, the small size of the equipment saves on the cost of  transportation. Valuable and precious metals from dry concentrated materials can be further refined by cold plasma or hot plasma gasification, followed by NaCl (salt water) hypochlorite leaching and a cyclone electrowinning system, depending on the characteristics of the ore contents. Electrostatic plate separators work by passing a stream of particles past a charged anode. Due to their induced attraction to the anode, the conductors lose electrons to the plate and are drawn away from the other particles. Other processes are limited in capacity because every particle must make contact with the drum or plate. The effectiveness of these contact charging processes is also limited to particles of about 100 μm or greater in size, due to the need to contact the grounded plate and the required particle flow dynamics. Due to inertial effects, particles of different sizes will have distinct flow dynamics, resulting in decreased separation. Unlike other electrostatic separation techniques, Avimetal’s separator is well suited for the separation of very fine (one Valuable and precious metals from dry concentrated materials can be further refined by cold plasma or hot plasma gasification, followed by NaCl (salt water) hypochlorite leaching and a cyclone electrowinning system, depending on the characteristics of the ore contents micron) to moderately coarse materials with maximum throughputs. Triboelectric particle charging works with a variety of materials and simply requires particle-to-particle contact. Avimetal’s separator is distinguished by its tiny gap, high electric field, counter current flow, intense particle-particle agitation, self-cleaning action of the belt on the electrodes and being environmentally sustainable.

Particles of different electrical charges or polarities are separated in an electric field because they follow different motion trajectories. This way, valuable material is separated from ore or slag

Electrostatic Machine

Labatory Model
$ 50K Free Shipping
  • 40000V 10 mA
  • 1M w x 2M l x 1M h
  • 100 kg to 500 kg / Hour

Electrostatic Machine

40,000V 25 mA
$ 100K Free Shipping
  • 1M w x 2M l x 2M h
  • 1~3 tons per hour
  • micron to <2mm

Electrostatic Machine

40,000V 50 mA
$ 200K Free Shipping
  • 2M w x 2M l x 2M h
  • 3 ~ 5 tons per hour
  • micron to <2mm
Popular