GN 3 phase disc stack separator is a high-speed, stable, sealed, efficient, and automatic slag discharge 3 phase separation equipment. It is widely used for liquid, liquid, solid 3-phase separation or liquid-liquid separation. The 2-phase solid-liquid separation disc separator has only one liquid discharge port and one slag discharge port, while the 3-phase disc separator has two liquid discharge ports and one slag discharge port, which can separate two liquids with different specific gravity at the same time. It can also discharge solid phase materials. Compared with the 3-phase decanter centrifuge, the 3-phase disc separator has a larger rotation speed and G force.

The 3-phase decanter centrifuge usually has a separation factor of about 3000G, while the 3-phase disc stack separator G force is up to 12000G. Therefore, the 3-phase disc separator can more thoroughly separate liquids with different specific gravity and the liquid phase discharged is more clarified. However, compared to 3 phase decanter centrifuges, 3 phase disc separator is more used to separate materials containing fine particles, with fewer solids content. So before entering the 3-phase disc separator, the material can be separated by the decanter centrifuge for pre-stage separation to reduce the solids content and remove big particles.

Working principle

The separated material enters into the heart of the machine, that is, the inside of the bowl. Under the action of strong centrifugal force, the material passes through a set of disc bundle separation intervals. With the neutral holes of the disc as the interface, the liquid with larger specific gravity moves along the disc wall towards the outside the neutral hole, where heavy slag accumulates in the sediment area, and the heavy phase liquid flows upward to the centripetal pump; the lighter liquid with a smaller specific gravity moves along the disc wall into the neutral hole and converges to the lower centrifugal pump. The light and heavy liquid phases are discharged by the lower centrifugal pump and the upper centripetal pump respectively; the heavy slag is regularly discharged; continuous production is implemented.


GN Solids Control has different sizes of sludge vacuum pumps for transferring all types of sludge. sludge vacuum pump specially designed to meet the requirements of plants in different industries Widely used in mining, chemical, construction, offshore drilling platforms.


Structure and Working Principle

Complete machine adopts vertical structure, small footprint, Vacuum for suction and positive pressure for discharge. It mainly consists of tank & pedestal combination, vacuum tube combination, air discharge manifold, sludge suction manifold, sludge discharge manifold, pneumatic control cabinet.

Sludge vacuum pump is a type of high load and strong suction capacity vacuum transferring pump, it is also called solids transferring pump or cuttings transfer pump. The unique structure design enables it work in the very tough circumstance with less maintenance. It is ideal equipment for transferring sludge with high solid content up to 80% and high specific gravity material. Vacuum pump has below featured: high efficiency Venturi device can produce a vacuum up to 10 meters water column for material suction under high air flow circumstance. It is designed with compact structure, almost no wearing parts, for high density material transferring like cuttings and oily sludge etc.


1、100% aerodynamic;

  1. No power requirements, safe operation in hazardous areas, safe explosion-proof;
  2. There are no rotating parts inside the cavity;
  3. Vacuum can be maintained
  4. Can produce 25” HG vacuum of mercury (up to 10m water column vacuum);
  5. Single person operation;

7, easy to move;

  1. Suction material, almost no wear parts.
  2. This equipment is a pressure equipment, and each user may need to apply for approval according to the situation in each country before it can be used.

Conveying material category:

  1. Drill cuttings from waste mud and vibrating screen, close to dry materials
  2. Mud, tail slurry and oily sludge
  3. Mud pit cleaning
  4. Recycling of hazardous waste

5, sludge, bottom of the tank

  1. Bilge cleaning of transport ships
  2. Material handling of bulk tanks and silos
  3. Sand, fine sand, and fracturing sand
  4. Diatomite
  5. Animal droppings
  6. Furnace Ashes, flour
  7. Almost known materials



Shale Shakers are widely used for solids control, they are equipment that allows to eliminate drilling cuttings from the drilling fluid and this whole process is done while circulating and drilling. In recent years GN technology has been improving, many different designs have come onto the market and research on the best design is constantly progressing as solids control is vital to keeping the costs associated with all kind of fluids, Oil and GAs, Mining, Construction and more.

GN Linear Dewatering Vibrating Screen adopts dual-motor self-synchronization drive technology with a built-in eccentric block. The vibration amplitude can be adjusted by the eccentric block.


GN Linear Dewatering Vibrating Screen is mainly composed of a screen deck, vibrating motor, supporting system, and electric control system. Through the synchronous and reverse operation of the vibrating motors, the centrifugal force generated by the two sets of eccentric masses is superimposed along the vibration direction, and the opposite centrifugal force is offset, thereby forming a single exciting vibration along the vibration direction, which makes the screen deck move back and forth linearly. GN High-frequency Linear Dewatering Vibrating Screen changes the water tension on the surface of the material through the exciting force. The liquid/water passes through the screen, while the fine solid particles are blocked by the screen to form a filter layer and move forward under the effect of the vibration force.

According to the material requirements, the Linear Dewatering Vibrating Screen can use a polyurethane screen panel. The polyurethane screen panel is lined with steel bars, which is very strong and wear-resistant, has a long service life, and does not pollute treated materials. The polyurethane screen panel adopts an inverted triangle three-dimensional anti-blocking design, which can effectively prevent blockage.


Mining Tailings Dewatering & Dry Discharge: Iron tailings, gold tailings, copper tailings, vanadium tailings, lead-zinc tailings, graphite tailings, etc.

Water-washed Sand Dewatering: Dewatering of quartz sand, zircon sand, glass sand, construction sand, foundry sand and building material sand.

Potash Feldspar Dewatering: less investment than filter press, lower energy consumption, convenient operation, better effect than screw classifier, it is a wise choice for potash feldspar dewatering.

Environmental Mud Dewatering: dewatering of municipal sewage, industrial wastewater, river dredging sludge, wastewater treatment, engineering mud treatment, construction mud, soil remediation, etc.

Fine Sand Recovery Application: Recycling and reuse of fine materials such as kaolin, mud, sand and gravel aggregate, artificial sand, coarse slime, concrete mixing plant, etc.



GN has been leading the development of centrifugal decanters from 9 inches to 30 inches with high quality materials and durability, with technology and precision in the assembly, receiving good comments from our end customers every day. The centrifugal decanter that GN has been activating the increasingly efficient process industry and maximizing resources to the full.



One of the processes used by the centrifugal decanter for the development of separation of solids and liquids is the fish industry.

For the fishmeal process, it begins its flow with cooking for the coagulation of the protein, with this process the bound water and oil are released, the separation by pressing of the coagulated product obtaining), a liquid stage (Press Liquor ) containing water and the rest of the solids (oil, dissolved or suspended protein, other nutrients such as vitamins and minerals) and a solid stage called (Press Cake).


The main part of the sludge in the Press Liquor is removed by centrifugation in a Decanter and the oil is by default extracted by centrifugation, due to the high G forces that our GN Decanters have and their materials used make an efficient separation. The Cola Water is concentrated in a multi-effect evaporator and the Concentrate is mixed vigorously with the Press Cake, which is then usually dehydrated in a sedative. The dried material is ground and stored in bags or in bulk. The extracted oil is stored in custom-designed tanks for later use or treatment that may be done in another process.


The functionality that GN offers in its centrifugal decanters in its wide range of models allows preventive maintenance to be carried out in longer periods and with less economic impact, making the end customer maximize their production costs; seeing as the best option the GN Solids control equipment is a safe and guaranteed investment in the short and long term.


GN Solids Control manufactures all 4-stage solids control equipment for treating drilling mud. This includes vibrating screen or Shale Shakers, desander, Desilter and decanter centrifuge. And also GN manufactures the drilling waste management equipment such as vertical trim dryer, high G drying agitator and waste treatment centrifuge. The decanter centrifuge for drilling mud treatment includes high-gravity and low-gravity solids separation, dewatering and wastewater treatment.


Different Kinds of Drilling Mud:

WBM, known as water-based mud, is Most basic water-based mud systems start with water, then clays and other chemicals are incorporated into the water to create a homogeneous mixture that resembles something in between chocolate milk and malt.

OBM which is known as petroleum-based mud, petroleum-based mud is a mud where the base fluid is a petroleum product such as Diesel fuel.

SBM, which is known as synthetic base fluids, is a mud where the base fluid is a synthetic oil. SBM is popular for offshore platforms.

Sludge from different types of drilling:

  • Oil and gas drilling mud
  • CBM drilling mud
  • Horizontal directional drilling / trenchless drilling
  • Tunnel Drilling Machine (TBM) for drilling grout
  • Construction boring mud piles
  • Water well drilling mud
  • Mining industry, diamond core drilling mud
  • Geothermal well drilling mud.

GN Solids control demonstrates to its clients that it can integrate their teams to provide comprehensive solutions that benefit the client in its different variables such as recovery, optimization of resources, process efficiency. The drilling mud treatment plant is a turnkey system that has been successfully implemented in our clients with outstanding performances as expected by the operator.