GN Nodig Mud Recycling System

GN Separation is pleased to announce that four mini decanter centrifuges have been shipped to Europe for solid-liquid separation in mineral exploration mud applications. These decanter centrifuges will play a key role in efficiently separating solids from drilling mud, helping exploration companies improve fluid recovery and reduce environmental impact.

Decanter Centrifuge Overview

The full name of the decanter centrifuge is the decanter centrifuge, a widely used piece of equipment in industrial solid-liquid separation. Depending on material characteristics in different industries, GN decanter centrifuges are available in dewatering, separation, and clarifying types.

With advanced centripetal pump technology, GN decanter centrifuges can also perform three-phase separation of solids and two immiscible liquids, providing flexible solutions for various applications.

GN Decanter Centrifuge Series

GN Decanter Centrifuge Features

As a leading manufacturer, GN Separation emphasizes product quality and long-term user benefits:

• Material Selection: High-quality centrifugal cast or forged stainless steel is used for the bowl and screw. Wear parts are protected with hard alloy.

• Precision Machining: CNC lathes, CNC centers, and CNC gantry milling machines ensure accurate machining of all centrifuge components.

• Dynamic Balance: In addition to low- and medium-speed balancing, GN applies high-speed dynamic balancing at actual operating speeds for optimal performance.

• Global Reach: GN decanter centrifuges are exported to over 60 countries and regions and receive high praise from customers worldwide.

With these four mini decanter centrifuges now in Europe, GN continues to support the exploration industry with reliable, efficient, and durable solid-liquid separation solutions.

As wastewater treatment requirements continue to increase worldwide, reliable and adaptable sludge dewatering equipment has become an essential part of both municipal and industrial treatment plants. GN Separation provides the GN T Series Sewage Treatment Decanter Centrifuge, designed specifically for sludge dewatering and thickening applications under a wide range of operating conditions.

Overview of GN T Series Dewatering Decanter Centrifuge

The GN dewatering decanter centrifuge belongs to the T Series horizontal decanter centrifuge, featuring a beach angle of 8.5 degrees. This design extends the drying zone of the centrifuge, enabling improved solid-liquid separation and achieving relatively drier discharged solids.

The T Series decanter centrifuge is commonly applied for sludge dewatering and concentration, and is widely used in municipal wastewater treatment plants as well as industrial wastewater sludge treatment projects that require higher dewatering performance.

This centrifuge series is primarily designed for materials that are relatively easy to separate, such as those with:

• Larger solid particle sizes

• Significant density difference between solid and liquid

• Low viscosity

• High solid concentration

• Large processing capacity requirements

• Higher dryness demand rather than clarification priority

For sludge or wastewater containing fine particles, flocculants are typically added upstream to aggregate fine solids into larger flocs before entering the T Series decanter centrifuge, thereby improving dewatering efficiency.

Typical Applications and Suitable Materials

The GN T Series dewatering decanter centrifuge is suitable for a wide variety of materials, including but not limited to:

• Municipal sewage sludge

• Industrial wastewater and organic wastewater

• Environmental wastewater sludge

• Oily sludge and oil-containing wastewater

• Drilling mud and construction slurry

• Tunnel slurry and mining wastewater

• Sand washing water and mineral washing water

• Steelmaking wastewater and precision casting wastewater

• Chemical, dyeing, and printing wastewater

• Aquaculture wastewater

• River sludge, lake sludge, and water plant sludge

• Kaolin, calcium carbonate, bentonite, silica, titanium dioxide

• Aluminum hydroxide, cryolite, silicates

• Oil sand separation, oil sludge, coal tar

• Inorganic fertilizer slurry

• Traditional Chinese medicine extracts (such as yew, honeysuckle, and licorice)

• Clarification, concentration, and dewatering of salt crystals and similar materials

Main Specifications of GN T Series Dewatering Decanter Centrifuge

The GN T Series includes multiple models to meet different capacity and site requirements, ranging from GNLW-224GT to GNLW-764GT, with bowl diameters from 220 mm to 760 mm. Maximum operating speeds reach up to 5054 rpm, with centrifugal force up to 3200 G, depending on the model.

The length-to-diameter (L/D) ratio is generally around 4.2, providing a balanced design for effective dewatering and stable operation. Main and back drive motor power configurations are available in multiple options to match different sludge characteristics and throughput requirements.

Final specifications are subject to the confirmed commercial and technical proposal. Processing capacity may vary significantly depending on actual material properties and operating conditions.

Design and Technical Features

Optimized Beach Angle and Dewatering Performance

The 8.5-degree beach angle lengthens the conical section, creating a longer drying zone. This structural design helps improve sludge dewatering performance and supports the discharge of solids with lower moisture content.

Robust Materials and Manufacturing Process

• Bowl ends and bowl body are manufactured using centrifugal casting, made from duplex stainless steel SUS2205 or SUS2304, offering better mechanical performance compared with conventional stainless steels such as SUS304 and SUS316.

• Key rotating components are produced through centrifugal casting and die forging, reducing risks associated with traditional welding, such as incomplete stress relief or intergranular corrosion.

Screw Conveyor Design

• Screw blades are formed using CNC spiral blade forming equipment, providing higher conveying efficiency than traditional pulled blades.

• Based on material characteristics, variable-pitch screw designs can be adopted to enhance conveying pressure and improve solids dryness.

• Some models use open-type screw blades to increase handling capacity.

• The screw is protected by replaceable wear-resistant alloy plates, allowing convenient maintenance and extended service life.

Separation Zone Optimization

The optimized slope angle and screw pitch, combined with a BD baffle, separate the settling zone from the dewatering zone. This design allows:

• Deeper liquid pool

• Longer dewatering zone

• Clearer separated liquid

• Increased processing capacity

The deeper liquid pool reduces kinetic energy loss during liquid discharge, contributing to lower energy consumption. The feed acceleration structure minimizes turbulence inside the feed zone, helping protect the screw discharge port and reduce wear.

Optional Double-Cone Design

For materials with high concentration or high viscosity, a double-cone bowl design is available. This configuration increases solids discharge resistance while improving solids dryness and liquid clarity without sacrificing throughput.

Wear Protection and Discharge Design

• Solid discharge ports are equipped with special tungsten carbide wear sleeves, providing high wear resistance and durability.

• Adjustable overflow weir plates allow flexible control of liquid pool depth to meet different dryness and clarity requirements.

Operation, Maintenance, and Safety

• Small models are equipped with gas spring-assisted covers, while larger models use labor-saving cover lifting devices, allowing one-person operation and reducing maintenance effort.

• Main bearings are designed with hydraulic dismounting structures, reducing disassembly force by approximately 90% and minimizing the risk of damage to precision components.

• All major rotating parts undergo three-stage dynamic balancing, including medium-speed balancing, high-speed balancing at operating speed, and complete machine balancing, ensuring stable operation.

Lubrication and Bearings

• High-quality SKF main bearings are used as standard.

• Small models can be equipped with semi-automatic or fully automatic grease lubrication systems.

• Large models adopt automatic oil circulation lubrication systems, providing bearing cooling and cleaning functions to extend bearing service life.

Monitoring and Control System

The GN T Series centrifuge is equipped with a comprehensive monitoring and alarm system. Key operating parameters such as:

• Bowl speed

• Bearing temperature

• Machine vibration

• Lubrication system pressure

• Motor current and torque

are monitored in real time. Automatic protection, alarm, blockage clearing, and shutdown functions help ensure safe operation for both personnel and equipment.

The electrical control panel is typically made of stainless steel and configured with internationally recognized brands of VFDs, PLCs, and HMIs. Explosion-proof control panels certified to CNEX, ATEX, or IECEx standards are available upon request.

Turnkey Solutions Beyond the Centrifuge

In addition to supplying dewatering decanter centrifuges, GN Separation leverages its extensive portfolio of separation and conveying equipment to provide turnkey sludge dewatering solutions, including material conveying, classification, and integrated dewatering systems tailored to customer requirements.

Request More Information

For overseas customers seeking reliable sewage sludge dewatering solutions, GN Separation offers flexible configurations and technical support based on actual project conditions.

• Request a quotation

• Download the brochure

GN Separation looks forward to working with you.

In response to growing demand for efficient and cost‑effective sludge handling solutions across industrial and municipal sectors in South America, GN Separation has delivered a tailored Sludge Dewatering Screw Press Package designed to meet rigorous performance and environmental requirements. This solution exemplifies GN’s commitment to providing reliable, automated dewatering systems that reduce sludge volume and improve downstream handling.

What Is a Screw Press and How It Works

A screw press is a mechanical dewatering apparatus that uses the principle of screw extrusion to separate solids from liquids in sludge. The design consists of a screw (or auger) rotating within a structured filtration zone formed by fixed and floating rings. As sludge progresses through the press, the screw geometry—specifically changing diameter and pitch—creates increasing compressive forces that squeeze out liquid. The filtrate exits through the narrow gaps while the concentrated solids are discharged as dewatered cake.

The process typically begins with sludge entering a conditioning tank, where flocculants are added to promote aggregation of fine particles. This conditioned sludge then flows into the dewatering section, where the screw’s movement generates pressure, reducing moisture content and producing a more manageable, solid output.

Key Components of the South America Package

The package delivered to the South America client includes the core GN Screw Press Dewatering Machine and supporting auxiliary systems:

• Automatic Control Cabinet: Enables continuous, automated operation with minimal operator intervention, improving reliability and reducing labor costs.

• Flocculation Modulation Box: Ensures precise dosing and mixing of flocculants to enhance solid capture and improve dewatering efficiency.

• Sludge Thickening and Dewatering Assembly: The core processing unit where solid‑liquid separation occurs through mechanical pressing.

• Filtrate Collection System: Manages and returns or discharges clarified water for further treatment or reuse.

Advantages of This Solution

The GN Screw Press offers several operational and economic benefits:

• Cost‑Effective and Environmentally Friendly: Lower capital and operational costs compared to some traditional dewatering technologies, with reduced energy consumption and footprint.

• Continuous and Automated Operation: Designed for fully automated control, facilitating consistent performance and reducing labor requirements.

• Low Risk of Blockage: The screw design and controlled gap structure minimize clogging, enhancing reliability.

• Wide Applicability: Suitable for sludge from municipal wastewater plants as well as a variety of industrial sources, including food processing, chemical, pharmaceutical, and leather industries.

Application Context in South America

For the South America project, the screw press package is engineered to handle local sludge characteristics while delivering robust performance under continuous operation conditions. By integrating an automated flocculation system with a screw press, GN Separation provides a solution that reduces sludge volume, lowers disposal costs, and aligns with environmental compliance objectives.

Conclusion

The Sludge Dewatering Screw Press Package supplied to the South America client represents an effective blend of mechanical design, automation, and process optimization. By focusing on continuous dewatering and reduced operational costs, this solution supports wastewater treatment facilities and industrial users in achieving enhanced sludge management outcomes with reliable performance and environmental benefits.

In iron ore beneficiation, maintaining clean and stable feed quality is essential for achieving high flotation efficiency and stable plant performance. Before ore enters the flotation stage, impurities such as grass roots, bark, plastic fragments, and even explosive fuse remnants can severely affect downstream operations. These contaminants not only reduce flotation efficiency but also lead to equipment blockage, downtime, and increased maintenance costs.

To address these issues, GN Separation offers the GN Trash Screen (Model: GNGZ1840A), a purpose-built solution designed to safeguard the purity of raw ore materials before flotation.

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Efficient Impurity Removal for Iron Ore Processing

The GNGZ1840A Trash Screen is engineered specifically for impurity removal in iron ore preparation plants. It combines powerful vibration with a durable, purpose-designed screen deck to effectively separate unwanted materials from the ore stream.

Key Benefits:

1. Reliable Separation of Undesirable Materials

The screen efficiently removes light and fibrous contaminants such as:

• Grass roots

• Bark and wood pieces

• Plastic or foreign soft materials

• Explosive fuse fragments

These impurities often originate from mining, blasting, and transportation. Removing them at the earliest stage protects the downstream process.

2. Improved Flotation Concentrate Quality

By maintaining a cleaner feed, the flotation process becomes more stable and selective. Cleaner ore slurry directly contributes to:

• Higher iron grade

• Reduced reagent consumption

• Lower risk of interference in flotation cells

3. Reduced Equipment Downtime

Trash materials can easily cause pump blockages, pipeline choking, and screen blinding. The GN Trash Screen helps operators significantly reduce:

• Unplanned shutdowns

• Maintenance frequency

• Wear on downstream equipment

This results in lower operating costs and higher overall plant availability.

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Robust Structure and Reliable Performance

The GNGZ1840A Trash Screen features:

• Strong vibration force for efficient stratification

• Reinforced screen box suitable for heavy-duty mining applications

• Customized screen panels designed to balance strength, permeability, and wear resistance

• Stable operation even under fluctuating feed conditions

Every component is engineered to withstand harsh mining environments, ensuring long service life and consistent performance.

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GN Separation – Complete Solutions for Mining and Mineral Processing

GN Separation provides a comprehensive range of solid–liquid separation and classification equipment for the mining industry. Beyond the Trash Screen, GN offers a wide portfolio of mineral processing solutions, including:

1. Mining Vibrating Screens

GN manufactures several types of vibrating screens for classification, dewatering, and desliming applications:

• High-frequency vibrating screens

• Large flip-flow vibrating screens

• Synergistic frequency vibrating screens

• High shear circular screens

These screens are designed to handle fine materials, high-moisture feeds, and demanding capacity requirements.

2. Tailing Management Solutions

GN provides decanter centrifuges specifically developed for:

• Tailing dewatering

• Recovery of valuable solids

• Sludge volume reduction

The machines feature rugged construction, wear-resistant materials, and automation options for stable tailing treatment.

3. Material Transfer Equipment

To support mining plant logistics, GN also offers:

• U-Type screw conveyors

• Progressive cavity pumps (single screw pumps)

• Vacuum pumps for solids and slurry transport

These systems streamline material handling and ensure smooth operations across processing lines.

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Conclusion

The GN GNGZ1840A Trash Screen is a crucial piece of equipment for iron ore beneficiation plants, protecting flotation processes from contaminants and ensuring high-quality concentrate production. Its strong separation capacity, durable design, and consistent performance make it an essential tool for maintaining operational efficiency.

Combined with GN’s extensive range of mining-class screening, dewatering, and conveying equipment, GN Separation continues to deliver reliable, industry-proven solutions for mineral processing plants worldwide.

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GN Separation recently completed the delivery of four units of GNLW554-VFD dewatering decanter centrifuges to an overseas municipal sewage treatment plant. This project marks another milestone in GN’s continuous effort to support global wastewater treatment facilities with reliable solid-liquid separation solutions.

Enhancing Sludge Dewatering Efficiency

Municipal wastewater treatment plants generate large volumes of sludge every day. Efficient dewatering is essential to reduce sludge volume, lower transportation and disposal costs, and improve overall treatment performance.

The GNLW554-VFD decanter centrifuge is specifically engineered for high-capacity sludge dewatering. Its large-diameter rotating bowl and optimized beach angle enable effective separation, even with materials containing high moisture and complex solids content.

Key performance strengths include:

• Large processing capacity suitable for municipal and industrial sludge

• High separation efficiency supported by a long bowl length-to-diameter ratio

• Stable operation under continuous heavy-duty working conditions

• Lower polymer consumption compared to traditional dewatering methods

These advantages make the GNLW554-VFD an ideal choice for medium to large wastewater treatment facilities.

VFD Control System for Process Flexibility

All four units are equipped with a Variable Frequency Drive (VFD) control system. This allows users to adjust bowl speed, differential speed, and feed rate based on the characteristics of the sludge.

Benefits of the VFD system include:

• Precise control of separation performance

• Energy efficiency through optimized motor speed

• Capability to handle varying sludge conditions throughout the day

• Automatic protection functions, including vibration monitoring and overload alarms

For wastewater plants that operate around the clock, such flexibility greatly improves cost-effectiveness and reliability.

Robust Materials for Municipal Wastewater Applications

The GNLW554-VFD centrifuge is built with corrosion-resistant materials suitable for the challenging environment of sewage treatment plants. Typical material configurations include:

• Stainless steel bowl and scroll manufactured by centrifugal casting

• Tungsten carbide protection on wear-prone components

• High-quality bearings from internationally recognized suppliers

• Optional duplex stainless steel or super duplex materials for aggressive wastewater conditions

This ensures long service life and reduced maintenance requirements.

Supporting Global Wastewater Treatment Projects

GN Separation has been supplying decanter centrifuges to various municipal and industrial wastewater projects around the world. The successful delivery of these four GNLW554-VFD units further demonstrates GN’s capability to support international partners with professional equipment and technical expertise.

With growing global attention on safe water treatment and environmental protection, GN Separation remains committed to providing efficient, reliable, and user-friendly solid-liquid separation solutions.