Author Archives: GN Decanter Centrifuge

GN Mini Shaker & Centrifuge for Diamond Core Drilling Operations

Introduction

In international diamond core drilling, effective mud treatment is crucial for successful operations. Recently we have delivered GN Mini Shale Shaker GNZS752 and the Small Diamond Core Drilling Decanter Centrifuge GNLW223 for the overseas clients. These two models, known for their excellent performance and compact size, offer robust support for drilling tasks.

Compact Mini Shale Shaker GNZS752: Powerful and Space-Saving

The GNZS752 Mini Shale Shaker is a compact and powerful option for mud treatment in No-Dig, HDD, water wells, and diamond core drilling. It boasts two 1.5KW vibration motors with a force of 7.5G and a 1.35m² screening area, equipped with dual screens for efficient separation.

Key Features:

  • High vibration intensity for effective solid particle separation.
  • Large screening area for improved processing speed.
  • Adjustable screen box angle for optimal separation based on mud properties.
  • Space-saving design suitable for tight sites.
  • Cost-effective performance.

Customized options include double or triplex shale shakers, connecting manifolds, and upgrades to vacuum shakers. It can also serve as an underflow shale shaker for mud cleaners, with straight-line or elliptical trajectory options.

Compact Decanter Centrifuge GNLW223 for Small Diamond Core Drilling

The GNLW223 decanter centrifuge is a compact horizontal spiral centrifuge designed for small-scale processing or limited-space applications. With a drum diameter of 9 inches and a length of 26.4 inches, it boasts a separation factor of 2492G, ensuring effective solid-liquid separation.

Configuration Options:

  • Fixed Speed Control: Ideal for constant separation speed requirements.
  • Full Hydraulic Control: Offers flexibility to adapt to varying conditions.
  • Frequency Control: Energy-efficient and adaptable to specific needs.

Recognized for its compact design, stable quality, and high cost-performance ratio, this centrifuge is suitable for industrial wastewater treatment and mining drilling wastewater treatment, supporting environmental protection and resource recovery efforts.

Conclusion

In conclusion, GN Mini Shaker & Centrifuge for Diamond Core Drilling Operations ensures efficient waste management and resource extraction, ultimately enhancing the productivity and sustainability of diamond mining enterprises.

 

 

 

Causes of thermal cracks in decanter centrifuges

The thermal cracks generated in the Decanter centrifuge all occur and develop along the junction of the dendrites in the weld metal. The most common situation is that cracks in the middle of the weld along the length of the weld are sometimes distributed between two dendritic grains inside the weld.

Decanter centrifuge hot cracks are all produced at the grain boundary, which shows that the grain boundary is a “weak zone” during the crystallization process of the weld.

The reason for the formation of this weak zone is because in the metal crystallization process, there are more brittle impurities enriched in the grain boundary, and these impurities have a lower melting temperature. For example, FeS can be formed when the metal to be welded contains high sulfur content, and FeS and iron form a low-melting eutectic with a melting point of only 988 degrees. For example, in the later stage of the solidification process of the welded metal, the low melting point eutectic is pushed to the grain boundary to form a so-called “liquid interlayer.” In the process of metal transition from liquid to solid, the weld is subjected to tensile stress due to volume shrinkage. Under the action of tensile stress, cracks may be formed in this liquid interlayer, that is, thermal cracks.

Therefore, the reason for the thermal cracking of the centrifuge is that the weld is subjected to the existence of a liquid interlayer, and the weld is subjected to tensile stress during the crystallization process. The existence of a liquid interlayer is the root cause of thermal cracks, and tensile stress is a necessary condition for thermal cracks. From the above analysis, it can be seen that not the entire crystallization process will produce hot cracks, but only in the later stage of the crystallization process, near the solidus line is the dangerous temperature zone for hot cracks.

Drilling Mud dewatering centrifuge Unit for Europe Client

GN Separation have successfully delivered two drilling mud dewatering decanter centrifuge systems to a European client. Each system is carefully designed with a GNLW364FT decanter centrifuge, a chemical dosing system, and a mud feed screw pump, all conveniently housed in standard containers for improved transportation efficiency and easy installation. This innovative packaging approach greatly enhances the equipment’s maintainability and protection, ensuring long service life and minimal downtime. Continue reading →

How to Address Gear Problems in Decanter Centrifuges

Decanter centrifuges contain numerous gears, and if any one of them encounters an issue, it can affect the entire operation. Based on the experience of decanter centrifuge manufacturers, common faults in centrifuge gears can generally be summarized as follows.

Common gear faults in decanter centrifuges include tooth surface wear, gluing and scratching on the tooth surface, tooth surface contact fatigue, bending fatigue, and broken teeth. Causes of these issues include manufacturing defects, improper assembly, inadequate lubrication, overload, and operational errors. Due to the structure and operating principles of gears, their vibration signals are often complex. Diagnosing gear vibration issues requires analysis in both the time domain and frequency domain. Whether the gear is in a normal or abnormal state, the change frequency of the gear meshing stiffness will always be present. Therefore, diagnosis should focus on the gear meshing frequency component. Due to the complex nature of gear signals, faults significantly impact the vibration signal. Amplitude modulation and frequency modulation can lead to numerous sideband structures in the gear vibration spectrum, which necessitates a detailed analysis during fault diagnosis.

The characteristic fault frequencies of centrifuge gears are as follows:

  1. Normal Frequency Spectrum: The spectrum typically shows the 1X frequency and meshing frequencies of all rotating shafts. Speed sidebands appear on both sides of the gear meshing frequency, with small peak values.
  2. Gear Wear: The gear’s natural frequency may appear, with a sideband at the rotational speed of the shaft containing the worn gear. With significant wear, a sideband with a higher peak may emerge near the meshing frequency.
  3. Eccentric Gears: Sidebands with higher amplitudes near the meshing frequency indicate gear eccentricity or shaft misalignment. As the load increases, so does the peak at the meshing frequency.
  4. Misalignment of Gears: This issue typically excites vibrations at the second or higher harmonics of the meshing frequency. Peaks at the 2X or 3X meshing frequency spectrum may increase, with side frequencies separated by the rotational speed.

GN Separation Will Show Decanter Centrifuge at Mongolia Mining International 2024 

As the golden shades of autumn sweep across the Mongolian landscape, the mining sector prepares for one of its most anticipated events: the Mongolia Mining International 2024 Exhibition. Taking place in the heart of Ulaanbaatar, this esteemed exhibition serves as a global hub for mining professionals, equipment manufacturers, and technology providers to showcase their latest innovations and build strategic partnerships. This year, GN Separation is set to introduce its advanced ore screening and tailings dewatering solutions, underscoring its commitment to sustainability and efficiency in the mining industry.

GN Booth Information:

  • Expo Date: 08-10 October 2024
  • Venue: Buyant Ukhaa Sport Palace, 10th Khoroo, Khan Uul, Ulaanbaatar, Mongolia
  • GN Booth: B03

At the forefront of GN Separation’s display will be two core technologies:

Stack Vibrating Screen
Engineered for high-capacity screening with enhanced precision and durability, the Stack Vibrating Screen utilizes a unique stacked configuration. This design allows multiple decks in a compact structure, significantly boosting screening capacity while minimizing spatial requirements. Suitable for processing a wide array of minerals such as coal, iron ore, gold, and copper, it can be customized to meet the specific needs of various mining operations.

Tailings dewatering centrifuge
Complementing the Stack Vibrating Screen, the Tailings Dewatering Centrifuge optimizes mineral recovery and reduces environmental impact. By applying centrifugal force, it efficiently separates liquids from solid particles in tailings, producing a drier, more manageable material. Its robust design ensures long-lasting performance and low maintenance costs, making it an ideal solution for modern tailings management.

Beyond just innovation, GN Separation is committed to promoting sustainable mining practices, offering solutions that not only increase operational efficiency but also reduce environmental harm. With water conservation and waste reduction becoming critical concerns for the industry, GN’s technologies provide practical answers to these challenges. The 2024 exhibition is set to be a pivotal moment for GN Separation, presenting an opportunity to connect with a global audience and establish new collaborations for future growth.

Introduction of the correct operation process of decanter centrifuge

The decanter centrifuge is a critical piece of equipment used in various industries for solid-liquid separation, including wastewater treatment, mining, and chemical processing. To ensure optimal performance and longevity of the centrifuge, it is essential to follow the correct operation procedures. Proper operation not only maximizes separation efficiency but also reduces the risk of equipment damage and unscheduled downtime. This guide outlines the key steps and best practices for the safe and efficient operation of a decanter centrifuge, helping operators achieve consistent results while minimizing operational costs. Continue reading →

3 Phase Decanter Centrifuge for oil water separation to China ES Company

Recently, GN Separation has successfully delivered a state-of-the-art 3–Phase Decanter Centrifuge to China ES Company, a key player in the oil and gas industry. This advanced centrifuge system will be used for efficient oil, water, and solids separation, a critical process in industries dealing with crude oil extraction, refining, and oily wastewater treatment. As part of GN Separation’s commitment to providing high-quality separation solutions, this delivery marks another successful project in serving global industries with cutting-edge technology.

Continue reading →

Shale Shaker

A shale shaker is a crucial equipment used in the drilling industry, particularly in the oil and gas sector, during the process of drilling for hydrocarbons. Its primary function is to separate and remove large solids from the drilling fluid or mud, which helps in maintaining the drilling fluid properties and preventing damage to downstream equipment. At GN our shale shakers have OLI or US Martin brand vibration motors and our control panels with Siemens or Schneider Components. We have prementioned composite frame screen with gear unit for fast screen change and longer screen life. The heavy duty design and heat treatment for the shaker basket to get the adjustable G force up to 8.0g. Our shale shaker has an adjustable deck angle, and can be adjusted while working. Here are some parts and important information of shale shaker. The drilling fluid, also known as mud, is directed onto a vibrating screen on the shale shaker. The shale shaker is equipped with one or more vibrating screens or sieves with different mesh sizes. These screens allow smaller particles and liquid to pass through while retaining larger solids. The shale shaker uses a vibrating motion to convey the drilling fluid through the screens. The vibration helps to separate the solid particles from the liquid mud. As the mud passes over the vibrating screens, the solids are separated based on their size. The larger cuttings are retained on the screens, while the smaller particles and liquid pass through. The separated solids are then collected in a trough or pan beneath the screens. This trough directs the cuttings to a designated area for further processing or disposal. Effective solids control through shale shakers is crucial for maintaining the overall drilling efficiency and reducing wear and tear on downstream equipment like mud pumps and mud motors. Shale shakers are typically part of a larger drilling fluid system that includes other equipment such as desilters, desanders, and centrifuges for further refining the drilling fluid. The choice of shale shaker and its settings depend on various factors, including the type of drilling operation, the characteristics of the drilling fluid, and the specific requirements of the well being drilled. Our GN shale shakers are very user friendly and very dependable. Our patents and our design leads a lot successful operations and through this dedication our clients grow relationship with GN.

shale shaker 1

Chemical Dosing System

A chemical dosing system is a mechanism or set of equipment designed to accurately and efficiently introduce chemicals into a process or system. These systems are widely used in various industries such as water treatment, wastewater treatment, industrial processes, and chemical manufacturing. The goal of a chemical dosing system is to control the dosage of chemicals to achieve specific outcomes, such as water disinfection, pH adjustment, coagulation, flocculation, corrosion inhibition, and more. GN we have a manual and automatic dosing system. Here are some key parts of the chemical dosing system. Chemical Storage Tanks are thanks that hold the chemicals to be dosed. They can range in size depending on the application and the volume of chemicals required. Controllers are devices that monitor and regulate the dosing process. They can be programmed to adjust dosage rates based on real-time conditions, such as flow rates, pH levels, or other relevant parameters. Sensors and Analyzers are devices measure the chemical concentrations or other relevant parameters in the system. Common sensors include pH meters, conductivity sensors, turbidity meters, etc. Tubing and Piping transport the chemicals from the storage tanks to the dosing pumps and then into the system being treated. Valves control the flow of chemicals through the system, and fittings ensure proper connections between different components. Chemical dosing systems often include safety features such as leak detection, alarms, and emergency shutdown mechanisms to prevent accidents and ensure the safe handling of chemicals. GN also has containerized combined chemical dosing system is mainly used in outdoor environment. It is rain and dust resistant, providing a safe and comfortable operating environment for operators, and facilitate the movement and transportation of the workplace. GN containerized combined chemical dosing system is composed of automatic dosing unit, several mixing barrel dosing unit and heat preservation containers. The thermal insulation container is designed according to the standard of camping house, including doors, windows, lighting system, embedded cables, water inlet and slag outlet Chemical dosing systems are crucial for maintaining optimal process conditions, ensuring product quality, and meeting regulatory requirements. They are widely employed in municipal water treatment plants, industrial facilities, and other settings where precise chemical control is necessary for operational success and environmental compliance. . To show how GN has an advance approach at these dosing systems, and how we can modify them to clients special request.

 

2020.07.08 Polymer Dosing Unit