Weir Minerals Africa has manufactured a 20-way cluster of Cavex® 500 CVX hydrocyclones for a gold project in West Africa.
This hydrocyclone delivers exceptional operational efficiencies, reduced wear and consistent metallurgical performance, the OEM said. With a design built for longevity, this unit is anticipated to exceed a 20-year lifespan because of its easily replaceable wear parts that ensure peak performance throughout its service life, it added.
The hydrocyclone cluster was specifically tailored to the classification and processing requirements the project, with Lerato Ramanala, Product Manager Hydrocyclones at Weir Minerals Africa, saying it will be used in a milling application as part of a flowsheet with an HPGR and ball mill – the Cavex hydrocyclones will classify the mill discharge. Operating at a relatively low pressure of 73 kPa, the hydrocyclones are engineered to minimise equipment wear under demanding conditions, the company says.
Ramanala said: “Our design process considered factors such as port sizes and pipe schedules, ensuring obstruction-free operation, even under challenging conditions in which the hydrocyclones have to contend with a wide range of particle sizes. The feed and discharge pipes were engineered to accommodate the required flow rate and pressure, maintaining a launder geometry that ensures optimal slurry levels during regular operation, without any spillage during normal and design operation.”
The hydrocyclone cluster operates efficiently: the overflow goes to the trash screen, the underflow launder diverts the discharge, returning some to the ball mill for further grinding, while the other portion is fed to a gravity circuit.
Ramanala says the hydrocyclone cluster is custom-engineered featuring Cavex hydrocyclones, Linatex rubber linings and Isogate WR valves. The Cavex hydrocyclone features a 360⁰ laminar spiral inlet that significantly enhances separation performance, she notes.
“To prolong wear life and reduce the need for frequent replacements, we’ve used R55 rubber, a patented Weir Minerals material, in the hydrocyclones’ rubber inserts,” she adds.
To address abrasion resistance, Linatex premium rubber, known to consistently outperform other rubber materials in abrasive wet processing applications, Weir Minerals says, was selected. The integration of Linatex rubber minimises maintenance requirements and guarantees optimal equipment performance.
The Isogate WR valve is a lightweight valve designed for a hydrocyclone cluster of this size, featuring advanced rubber sleeve technology for improved wear life and full bore design for unrestricted flow, the company says.
“Notably, this is the first greenfield cluster to incorporate Synertrex IIoT technology for performance monitoring, specifically to detect any roping or splashing events,” Ramanala says. This proactive performance monitoring platform enhances the overall effectiveness of the Cavex hydrocyclones by providing accurate data on cyclone performance, supporting the operator in maintaining optimal operating conditions and enabling proactive intervention for unforeseen incidents, the company explained.
Ramanala added: “Synertrex is much more than a condition monitoring system for individual pieces of equipment. As the technology continues to develop and Weir Minerals works to leverage the equipment and process data it alone has as the OEM, its customers are increasingly seeing it as the preferred partner for intelligent solutions and digitally-enabled services.”
Even with its substantial size, a cyclone cluster of this magnitude maintains a more compact overall footprint, facilitating space optimisation within the process plant while still achieving the necessary cut point, according to the OEM.
Weir Minerals Africa says its experienced local team carefully analysed operational requirements, flow rates and pressure differentials when designing this Cavex hydrocyclone cluster to maximise efficiency and meet required throughput rates. Structural integrity was a primary focus due to the cluster’s large size, and extensive use was made of computer-aided design to ensure a robust design capable of withstanding demanding conditions. The structural design includes walkways, support beams and bracing mechanisms.
The large cluster was manufactured at Weir Minerals Africa’s facility, undergoing trial assembly and quality checks before being disassembled and packaged for shipment to the customer. Installation on site will be part of the greenfields process plant construction project, with Weir Minerals Africa specialists readily available for installation and commissioning support.
