Explore our foundational range of heavy-duty crushers, mills, and gravity separators designed for global mining operations.
Global Countries Supported
Year Established
Gold Recovery Performance
Certified Standards
In modern mineral processing, the extraction of gold from alluvial, placer, and hard-rock ores requires technologies that minimize environmental impact while maximizing recovery rates. Gravity separation utilizing Gold Concentrator Spirals exploits differences in the specific gravity of minerals to achieve high-efficiency concentration. When slurry containing crushed ore and water is fed into the top of a spiral, the material travels downwards along the helical trough.
As the pulp moves through the helix, particles are subjected to a complex combination of centrifugal force, gravitational pull, hydrodynamic drag, and lift forces. Dense gold particles (specific gravity ~19.3) quickly settle to the bottom of the slurry stream, where friction slows their progress. They align along the inner radius of the spiral path under the influence of gravity. Conversely, lighter gangue minerals (specific gravity ~2.6 to 2.7) are swept outward into the high-velocity zone of the stream by the centrifugal forces.
“Our advanced spiral structures maximize Bagnold shear stress and boundary layer fluid dynamics, enabling operators to achieve pre-concentration targets without resorting to hazardous chemical reagents such as cyanide or mercury.”
This physical stratification process allows for continuous, low-cost separation. By positioning adjustable splitters at the discharge end, the stream is divided into concentrate, middlings, and tailings, creating a highly efficient loop that significantly increases downstream grinding and smelting capacity.
Analyzing global demand, regulatory shifts, and structural improvements in gravity concentration methodologies.
Global environmental regulations on tailing dams are tightening. Gravity processing reduces tailing toxicity, minimizing environmental bonding costs and easing community relations.
By shifting to mechanical gravity systems, mines reduce energy reliance on intensive fine-grinding. Eliminating premature chemical processes lowers operational costs by up to 35%.
Rethinking waste: recovery of micro-fine gold from abandoned tailing sites is now a primary revenue stream for modern operations across Africa and Southeast Asia.
As ore grades decline globally, processing plants must handle higher volumes of material to yield equivalent target metals. Heavy machinery manufacturers have faced calls to innovate beyond standard spirals. In response, modern factories supply configured multi-start spiral systems. These designs increase the feed volume per square foot of plant space while maintaining high grade concentration.
Our solutions target these challenges by integrating our systems with wet mills, screens, and flotation circuits. Whether upgrading a small-scale placer project or building an industrial-scale processing plant, our engineers customize pitch profiles and wear materials to match the characteristics of your ore.
Ascend has developed steadily since its establishment. Our business covers more than 130 countries and regions around the world, especially in Africa and Southeast Asia. Our machinery quality and after-sales service have won widespread praise from international customers.
Exploring the engineering choices, wear-resistant linings, and design metrics behind high-yield gravity concentrators.
Spiral concentrators operate under highly abrasive conditions. High-velocity quartz particles, abrasive silicas, and acidic pulp waters will wear down low-quality troughs, causing premature replacement and plant downtime.
To address this wear, we construct our spiral structures using glass-reinforced plastic (FRP). This material provides structural integrity, minimal weight, and resistance to environmental degradation. The interior trough is protected by a thick, high-density polyurethane elastomer lining or a spray-applied polyurea shell. These linings resist abrasive wear, dampening surface turbulence and helping to maintain the laminar flow patterns necessary for efficient gravity separation.
Optimizing gravity separation requires managing several operational parameters:
Explore detailed technical descriptions and profiles of our major mining machines.
Impact crusher is a kind of secondary crushing equipment which uses impact power to crush materials. Impact crusher is characterized by easy maintenance, high reduction ratios and high efficiency to produce precisely cubic shape products. It is designed with three crushing chambers, seamlessly connected rotor, wear-resistant blow bar and installation of insert type. Moreover, it has tooth type liner, gradient designed bearing seat, frame with several openings and screws or hydraulic start-up devices. Impact crushers can be used in all different stages of size reduction from primary crushing to the last step of the crushing process.
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Designed for portability and rapid setup, our mobile crushing plants allow operators to set up close to mining faces. This setup reduces haul truck cycles and lowers raw energy consumption in quarrying and ore dressing processes.
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A high-capacity, fine-grinding system engineered to reduce ores to the target liberation size, allowing gravity spirals to isolate and recover heavy gold particles.
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Integrated, skid-mounted mineral lines combining crushing, grinding, sizing, and concentration modules for simplified site commissioning and rapid start-up.
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A comprehensive line of machinery, including classifiers, flotation cells, thickeners, and separators, optimized to help operations meet strict metallurgical recovery targets.
Read MoreReal-world projects showcasing our machinery shipped to key gold production hubs worldwide.
Nov 2025
Providing compact, off-grid crushing solutions for remote locations in Papua New Guinea to simplify downstream processing.
Aug 2025
Expanding mechanical recovery setups for artisanal and medium-scale operations across copper and gold regions in Zambia.
Henan Ascend Machinery & Equipment Co.,Ltd. was established in 2005 and is located in the high-tech zone of Zhengzhou City, Henan Province. For nearly two decades, we have remained focused on engineering heavy-duty equipment built to withstand harsh mining environments.
Ascend is mainly engaged in the research and development, manufacturing, sales, and after-sales service of complete sets of crushing, grinding, screening, feeding, and conveying heavy mining machinery. If you need to crush limestone, granite, gravel, or other stone, grind them into powder, or extract gold, please feel free to contact us. Just tell us your needs, and our engineers will provide you with professional advice. Because we operate our own factory, we can guarantee machine quality while maintaining competitive pricing. We look forward to partnering with your team.
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Developing gravity separation systems for more efficient and sustainable mining operations.
Integrating mechanical actuator systems that adjust splitter settings based on optical slurry density sensors, reducing the need for manual calibration on the plant floor.
Testing hybrid polymer and ceramic coatings to extend the wear life of the feed section, helping to lower plant maintenance overhead.
Designing structures that pack quickly into standard 40-foot containers, speeding up delivery and setup for projects in remote mining areas.
Technical answers to common questions about gravity separation and plant setups.
Spiral concentrators are highly effective for processing particle sizes between 2.0 mm down to 0.030 mm (30 microns). For particles below 30 microns, centrifugal concentrators (such as Knelson style systems) or shaking tables are often recommended to maintain high recovery rates.
Optimal performance typically requires a slurry density of 25% to 35% solids by weight. While some modern spiral designs do not require constant wash water additions, managing feed consistency with automated valves helps prevent surging and keeps separation stable.
Yes, though high clay levels increase slurry viscosity, which can interfere with the settling of fine gold. We recommend using a scrubber or desliming cyclone upstream to wash the feed before it enters the spiral circuit.
Using fiber-reinforced plastic (FRP) with a high-durability polyurethane coating, our spirals are built to run for several years under normal conditions. Regular inspections of the feed box and splitters help catch wear early, and small worn areas can be repaired using touch-up polyurethane kits.
Explore our broader line of beneficiation equipment, including centrifugal concentrators, mills, and roller crushers.
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