Author: gnadmin

GN 30-inch Bowl Diameter Decanter Centrifuge for Domestic Mining Slurry Concentration Application

GN SOLIDS CONTROL recently supplied a 30-inch (760 mm) bowl diameter decanter centrifuge to a domestic mining operation for slurry concentration duty. This unit, model GNLW764A-VFD, represents a significant step in processing capacity for mine dewatering and especially tailings management.

The centrifuge features a bowl length of 3160 mm, yielding a length-to-diameter ratio of 4.2:1. This extended geometry provides prolonged residence time, which is essential for achieving fine solids capture in high-volume slurry streams. The unit handles up to 528 GPM (120 m³/h) at 20% solids content, making it suitable for large-scale mining operations where throughput directly affects production schedules.

Durability in abrasive mining slurries is addressed through tungsten carbide protection applied to the slurry distribution port, solids discharge port, and the screw conveyor surfaces. These wear-resistant measures extend service intervals and reduce maintenance downtime in continuous operation.

Beyond mining slurry concentration, GN’s bowl size serves tunnel boring mud cleaning, dredging slurry separation, industrial wastewater treatment, and municipal sewage sludge dewatering. The VFD-controlled unit allows operators to adjust bowl and differential speeds to match varying feed conditions, optimizing separation performance without mechanical modification.

This domestic installation demonstrates that large-diameter centrifuges, properly specified for the application, can provide reliable, high-capacity solids concentration in demanding mineral processing environments

GNLW554-VFD Decanter Centrifuge Delivers Proven Results for African Tank Bottom Oily Sludge Treatment

GN Separation is pleased to announce the successful deployment of its GNLW554-VFD large-bowl decanter centrifuge at a major tank bottom oily sludge treatment project in Africa. The installation marks another milestone in the company’s expanding footprint in the African oil & gas and industrial wastewater treatment sectors.

Addressing a Persistent Industry Challenge

Tank bottom oily sludge — a complex mixture of crude oil residues, water, and solid sediments that accumulates in storage tanks — has long presented operators with significant environmental and economic challenges. Traditional treatment methods are often labor-intensive, inefficient, and costly, particularly in remote African field locations where infrastructure and logistics constraints add further complexity.
High levels of free fatty acids (FFA) and varying solid compositions further complicate separation processes, requiring equipment that can adapt dynamically to changing feedstock characteristics.

The GNLW554-VFD Solution

Deployed as the core separation unit in the treatment train, the GNLW554-VFD decanter centrifuge has demonstrated exceptional performance across key operational metrics:
  • High-Capacity Bowl Design: The 550mm diameter large bowl delivers enhanced processing throughput while maintaining superior separation efficiency, enabling the client to handle substantial sludge volumes within tight project timelines.
  • Variable Frequency Drive (VFD) Technology: The fully adjustable VFD control system allows operators to fine-tune bowl speed and differential speed in real time, optimizing separation performance for varying sludge consistencies, FFA levels, and oil recovery targets.
  • Robust Construction: Built with wear-resistant materials and engineered for continuous-duty operation, the centrifuge excels in the harsh operating conditions typical of African oilfield environments.

Measurable Operational Benefits

Since commissioning, the system has delivered significant value to the client:
  • Maximized Oil Recovery: High-G-force centrifugal separation efficiently recovers reusable crude oil from the sludge stream, turning waste into revenue.
  • Reduced Waste Volume: Dramatically decreased sludge disposal volumes translate into lower hauling and landfill costs.
  • Environmental Compliance: Cleaner effluent discharge helps the operator meet stringent local environmental regulations.
  • Lower Operating Costs: Automated continuous operation reduces manual labor requirements and overall treatment costs per ton.

Expanding African Market Presence

This successful deployment reinforces GN Separation’s position as a trusted provider of solid-liquid separation solutions across Africa. The company’s equipment is already widely used in applications ranging from POME (Palm Oil Mill Effluent) treatment in West Africa to drilling mud processing and industrial wastewater projects continent-wide.
“Our GNLW554-VFD centrifuge was engineered specifically for challenging applications like tank bottom sludge treatment,” said a spokesperson for GN Separation. “The results from this African project validate our approach — robust equipment, intelligent controls, and real client value. We look forward to supporting more operators across the region in achieving their waste reduction and resource recovery goals.”
GN Separation is a leading manufacturer of decanter centrifuges, shale shakers, and complete solid-liquid separation systems serving the oil & gas, environmental, mining, and food processing industries worldwide.

HYDRAULIC DRIVE MUD CENTRIFUGE AND CUTTINGS DRYER FOR ASIA CLIENT

GN SOLIDS CONTROL recently has successfully shipped a full hydraulic drive decanter centrifuge and a vertical cuttings dryer to Asian customers. Both equipment address specific operational challenges in drilling fluid management and cuttings processing.

Unlike electrically driven units, GN’s hydraulic drive decanter centrifuge uses two independent hydraulic circuits to drive the bowl and the scroll conveyor separately. The hydraulic pump unit which driven by a single electric motor, feeds each circuit with its own pump and control system. Bowl speed and differential speed can be adjusted independently and continuously during operation, providing flexibility when processing variable mud weights or encountering changing downhole conditions.

The vertical cuttings dryer delivered alongside the centrifuge is designed specifically for drilled cuttings from oil-based and synthetic-based mud systems. Operating at 900 RPM, the unit generates 420 G of centrifugal force to separate liquid from solids. The stainless steel screen bowl retains the cuttings while allowing fluid to pass through the screen openings. Angled flights attached to the cone, rotating slightly slower than the bowl, extract the dried cuttings. Tungsten carbide hardfacing on the flights achieves HRC 65 hardness, significantly extending service life compared to conventional wear protection.

The delivery to Asian clients reflects growing recognition that properly specified solids control equipment—whether hydraulic drive centrifuges for demanding mud conditions or vertical dryers for efficient cuttings discharge—can improve fluid economics and reduce waste handling costs.

GN Potato Slices Flushing Water Starch Separation Centrifuge Gains Popularity Among Domestic Food Processing Plants

GN Special Centrifuge Realizes Efficient Starch Recovery from Potato Rinsing Wastewater, Empowering Domestic Potato Deep Processing Enterprises with Circular Economy Upgrade
July 3, 2026 – With increasingly stringent environmental protection requirements and rising raw material costs in China’s food processing sector, potato chip and french fry manufacturers are facing prominent problems of starch loss in slicing rinsing wastewater, high sewage treatment expenses and resource waste. Against this backdrop, the potato slices flushing water starch separation centrifuge independently developed and manufactured by GN Separation has been widely recognized and applied by numerous domestic food factories, delivering remarkable economic and environmental benefits for potato deep processing production lines.
In conventional potato processing workflows, large quantities of free starch dissolve into rinsing water after potato peeling, slicing and cleaning. Direct drainage not only increases organic pollutant load and wastewater treatment pressure for factories, but also results in massive wasted recoverable starch resources. Tailored to the physical properties of potato starch slurry, GN’s dedicated starch separation centrifuge adopts food-grade 304 stainless steel for all material contact components, fully complying with national food hygiene and production specifications. Equipped with complete CIP online automatic cleaning system, the unit effectively prevents material residue, bacterial reproduction and cross-contamination during long-term continuous food-grade production.
Based on high-speed centrifugal sedimentation principle, GN centrifuge continuously and automatically separates solid starch particles from potato slice flushing wastewater. Concentrated starch slurry separated out can go through subsequent dehydration, drying procedures for internal reuse in production or external sales as by-product to generate extra revenue. Meanwhile, clarified treated water can be recycled back to potato peeling, slicing and rinsing stations, cutting factory fresh water consumption by 30%~50%. Compared with traditional sedimentation tank and hydrocyclone separation processes, GN equipment features higher starch recovery rate (stable above 92% in field operation), smaller footprint, fully automatic unattended continuous operation, stronger adaptability to fluctuating wastewater flow and starch concentration, and more stable long-term separation performance.
Up to now, GN’s potato rinsing water starch separation centrifuges have been installed and put into stable operation in batches at many large, medium and small food processing plants located in major potato producing regions including Shandong, Henan and Inner Mongolia. End customers reported that the equipment helps them reduce sewage charges, lower water procurement costs and create incremental income from recovered starch, comprehensively lifting the overall profit level of potato deep processing projects.
Industry analysts commented that under the trend of energy conservation, emission reduction and resource recycling transformation in the food industry, GN customized separation equipment targeting potato processing wastewater starch recovery will become standard supporting configuration for newly-built and renovated potato chip and french fry production lines. Relying on independent technical advantages and mature on-site application experience, GN Separation will continue to launch targeted solid-liquid separation solutions for various food processing segments, facilitating the high-quality, low-carbon and circular development of domestic food manufacturing industry.

WHY GN DECANTER CENTRIFUGE DELIVERS RELIABLE SOLIDS CONTROL Control PERFORMANCE

For drilling contractors and mud service companies, selecting a decanter centrifuge involves more than comparing specifications on paper. The real question is whether the equipment will perform consistently under variable complex conditions, and remain serviceable over multiple campaigns. GN SOLIDS CONTROL designs its decanter centrifuges with these operational realities as the starting point.

The GNLW series covers bowl diameters from 9 inches to 30 inches, accommodating applications ranging from barite recovery to fine solids separation and dewatering. Every model maintains a bowl length-to-diameter ratio exceeding 3.0—a geometric parameter that directly influences residence time and separation efficiency. This ratio, combined with variable frequency drive (VFD) control, allows operators to adjust bowl and differential speeds to match changing feed conditions, whether processing weighted drilling fluid or high-volume tunnel boring slurry.

Material selection distinguishes our centrifuge from conventional designs. The bowl cylindrical and conical sections are manufactured from Duplex Stainless Steel 2304 via centrifugal casting, a process that ensures dense, homogeneous metallurgy with excellent resistance to chloride-induced corrosion and stress cracking. Other bowl assembly components utilize SS304 stainless steel. These material choices are not arbitrary; they are specified to endure prolonged contact with saline formation fluids and chemically treated mud systems.

Wear protection follows the same engineering discipline. Tungsten carbide tiles shield the screw conveyor at critical wear points, while the flow distribution port and solids discharge port are similarly protected by tungsten carbide alloy. These sacrificial wear surfaces extend service intervals and reduce downtime for refurbishment. The liquid discharge weir height is adjustable, providing process flexibility without requiring mechanical modification.

The bowl assembly incorporates a tighten belt support system that protects bearings during transport and operation. Genuine SKF bearings are specified throughout, supported by an automatic lubrication system. The pressurized, explosion-proof VFD control cabinet, fully PLC-controlled, provides consistent power management and process monitoring. This combination of metallurgical integrity, targeted wear protection, and intelligent control delivers the operational predictability that field crews depend on.