Tag Archives: Weba Chute Systems

Weba Chute Systems taking a systematic approach to equipment design

Comminution of minerals, Mining equipment, Mining services, , , ,

With most of its 5,000-strong global footprint of transfer chutes being installed in southern Africa, Johannesburg-based Weba Chute Systems says it has built a reputation in demanding mining conditions.

The region is a leading producer of platinum and manganese, for instance, which are both highly abrasive ores, points out Dewald Tintinger, Technical Manager at Weba Chute Systems. The company’s innovative approach and customised designs control material flow and resist wear, matching specific site conditions.

“First and foremost, a chute must facilitate optimal throughput so that mining production is not hampered by frequent blockages or repairs,” Tintinger says. “It is well known that the cost of a quality chute is a fraction of the cost of lost production through downtime.”

He highlights that Weba Chute Systems takes a systematic approach to assessing each customer’s requirements, starting with the general arrangement of the area around transfer points. The depth of experience accumulated over 40 years in business allows the company’s experts to suggest improvements to the layout – where these are possible and where they affect the chute performance.

“Then we consider a range of key factors like the material characteristics, the throughput tonnages and speed of travel, when we plan the design,” Tintinger says. “These considerations guide the application of our controlled flow philosophy.”

The design is built on scientific calculations using the anticipated trajectories, impacts and pressures on the structure. The main conceptual options are Weba’s Cascade Chute with dead boxes, the Weba Superflow chute with liners or a combination of both.

“A key element of our popular Cascade Chute is the use of dead boxes and lips on the inside of the structure, which traps material and allows other material to flow over it,” Tintinger says. “This ensures that up to 70% of the wear surface is protected by stationery material, which substantially reduces wear and maintenance costs while extending service intervals.”

As material enters the chute and flows through, it lands mainly on other material which absorbs the impact more effectively, protecting the underlying wear plates and structure from undue damage. This also reduces dust creation, he notes, which is an ongoing health and safety concern on mines.

“Controlling material flow through the right chute design also protects costly equipment like conveyor belts,” Tintinger says. In one example, Weba Chute Systems installed a Cascade Chute at a southern African copper mine to better control the flow of material onto conveyor belts. This saved immediately on belt costs – while boosting productivity through improved uptime.

Weba Chute Systems bids farewell to founder Werner Baller

Bulk handling, Mining people, ,

Werner Baller, founder of Weba Chute Systems, has passed away, leaving behind him a bulk material handling legacy.

Born in 1940 in Brotdhof, West Germany, Baller earned a National Diploma in Ceramic Engineering from Koblens / Rhein, Hoergrenshausen. His pursuit of excellence took him to South Africa in 1965, marking the beginning of a remarkable legacy.

In 1983, Baller’s entrepreneurial spirit led him to acquire a small mining supply firm, M&J Engineering. His approach transformed this company into Weba Chute Systems, a global leader in custom engineered chute systems for bulk material transfer, which also resulted in the development of nine patented products, including the groundbreaking Weba Chute System, which revolutionised the industry with its unique ‘super tube’ or cascade design.

The company said: “Werner was more than an entrepreneur and engineer; he was a beloved family man known for his passion, integrity and unconditional love. His legacy extends beyond his professional achievements, embodying the values of honesty and dedication in every aspect of his life.”

Today, Weba Chute Systems, under the leadership of Werner’s son, Mark Baller, continues to be an industry leader, exemplifying the innovation and quality Werner instilled. His induction into the International Mining Technology Hall of Fame in 2018 is a testament to his enduring impact on the industry.

The company added: “Werner’s journey from a small German town to the pinnacle of engineering innovation is a story of determination, ingenuity and unwavering commitment. His contributions have left an indelible mark on the mining and engineering industries, and his legacy will continue to inspire future generations.”

Weba Chute Systems helps Northern Cape mine with transfer point efficiency project

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Weba Chute Systems is working with a mine in the Northern Cape of South Africa to improve material flow, with the operation having ordered two custom engineered chutes from the specialist transfer point company, which are expected to improve efficiency at the transfer points.

According to Weba Chute Systems’ Regional Manager for the Northern Cape, Arnold Archer, the contracts are for an apron feeder discharge chute and a jaw crusher feed chute. Archer says the company had previously supplied the mine with a SAG mill feed chute, and had collaborated successfully to improve performance within that application.

With run-of-mine material at the mine including large lump sizes of 800 mm to 1.2 m, there is a high risk of blockages if the chutes are not purpose designed, he argues. The high velocity of the material can also cause considerable damage to chutes as well as create excessive dust.

To inform Weba Chute Systems’ designs, the company’s team uses technical questionnaires to help gather information from the customer on a range of variables. This includes factors like lump size indicators, belt speeds, feed rates, moisture content and material velocity. The application-specific data paves the way for a design that optimises flow and equipment life, the company says.

“On the apron feeder discharge chute, for instance, we designed a swing door that will absorb most of the impact of big lumps moving at high velocities,” Archer says. “This also helps to protect the wear plates on the jaw crusher.”

The aim of the design will be to assist the mine reduce the incidences of chute blockages, spillage and excess dust – making the process more streamlined and less labour intensive. He points out that the mine aims to achieve higher uptime through optimal chute performance. The reduction in spillage and dust also contributes to the mine’s high standards of health and safety.

“Our philosophy is that every transfer point on a mine has its own specific challenges, so the chute for each transfer point will be different to the next one,” Archer says. “We work with customers to understand the detail of their material flow through these points, so that our design takes all the key factors into account.”

He notes that most mines will have the necessary data gathering systems in place to inform the correct chute design – as they have tachometers on their conveyors, blocked chute detectors and feed monitors. The issue is that this information is not always systematically considered during chute design.

“We are proud of the chutes we design and manufacture, and stay close to our customers to ensure that the chutes’ performance is up to expectation,” Archer explains. “Our staff is passionate about getting everything right, and being there to follow up where necessary.”

Among the improvements made on the SAG mill feed chute at the mine, for example, were changes to the liner composition and pattern. Rather than removing all the liner segments to reach the middle row, the pattern change now allows this row to be removed without loosening all the other liners, he says.

Weba Chute Systems can also install its own chutes, but provides supervision and assistance where the mine arranges the installation itself, Archer concludes.

More Weba chutes set to arrive at Zimbabwe platinum mine

Comminution of minerals, Mineral processing, Mining equipment, Precious metals, , , , ,

South Africa-based Weba Chute Systems is set to provide 10 more of its custom engineered transfer chutes for the expansion of an underground crusher station at a platinum mine in Zimbabwe.

Overseeing the contract for Weba Chute Systems is Project Manager, Ted Cruikshank, who explains that the design, manufacture and delivery of the units is already 80% complete. Over the past 20 years, the company has installed approximately 70 chutes for this customer.

“The chutes being supplied in this latest contract will feed run-of-mine material from the ore pass to the underground crusher, as well as from the crusher to the outgoing conveyor,” Cruikshank said. “This has involved designing and building chutes ranging in height from two metres to six metres.”

Before the crusher, the chutes take large material of up to 650 mm in size from a vibrating feeder, at a maximum tonnage of 1,100 t/h. Other chutes take the feeder’s undersize, which is smaller than 180 mm in size, at 550 t/h. Some of the chutes will also be used in conveyor-to-conveyor applications; these feed 1,500-mm wide belts with up to 1,350 t/h of material with a maximum lump size of 250 mm.

“The abrasiveness of platinum ore makes our chute design philosophy – based on the cascade system – very important,” Cruikshank said. “Our use of dead boxes on the inside of the chute creates a layer of ore for the moving material to flow over – thereby extending the wear life of the chute itself.”

Replaceable lips on the dead boxes become primary wear parts, which can be easily and quickly swapped out at the necessary intervals. By controlling the flow of the mined and crushed material, the chutes facilitate smoother transition and central loading onto conveyor belts, in turn reducing wear, damage and spillage, the company explained.

“The chutes also include inspection doors for easy access during maintenance,” Cruikshank said. “To promote optimal uptime for the customer, we are also including a spare set of wearing lip liners for each chute. These are vital for securing the material layer, while ensuring that the dead box itself is protected from undue wear.”

Weba Chute Systems’ agent in Zimbabwe, the locally owned firm Hilmax, will supervise the installation of the chutes.

Weba Chute Systems wins retrofit design work at Mpumalanga coal mine

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When a coal mine in South Africa’s Mpumalanga province needed to replace its high maintenance conventional transfer chutes, it looked to Weba Chute Systems for the best custom-engineered design, the manufacturer says.

Weba Chute Systems is currently busy with designs that will pave the way for the retrofitting of over a dozen chutes at the mine. Eight of the units are silo discharge chutes, transferring coal from the operation’s run-of-mine feed to its coal processing plant. Another four chutes are to be replaced in the plant itself, while there is another chute located between two related feed conveyors.

“The main objective of the new bespoke chutes is to ensure stable supply to the plant, and from there to the nearby power station,” Dewald Tintinger, Weba Chute Systems’ Technical Manager and Designer, says. “The existing equipment is demanding too much maintenance, leading to unacceptable levels of downtime.”

The key to improved uptime and extended chute lifespan is the company’s flow control principles in its designs. The chutes in the plant, for example, must deal with oversize material of between 150 mm and 500 mm in size.

“Handling these large particles, chutes are exposed to high levels of impact and wear,” Tintinger says.“With the controlled flow philosophy of our Weba ‘cascade’ chute system, we control both the velocity and the impact.”

Commenting on other aspects of the custom designs, Tintinger says the transfer points will include features such as dead-boxes to create a lining from the mined material itself. This reduces the wear on the chute’s metal surfaces, extending the maintenance intervals and delivering more uptime. He highlights that the processing plant feeds the power station directly through two overland conveyors.

“This is a highly efficient model for delivering coal, but it demands that all elements of the materials handling system are working together,” he says. “Any disruption of coal flow caused by a transfer chute can cause costly delays, and render coal delivery unreliable.”

He notes that the mine has had good experience from the many other Weba chutes already installed at this operation, and is now standardising on this internationally accepted transfer point design for better results.

Designs and engineering are conducted in-house by Weba Chute Systems’ experienced team, using the latest software and finite element analysis tools for testing.

The design work is expected to be completed around the middle of 2022. Thereafter the mine will be in a position to contract the fabrication and installation work.

Botswana diamond mine feels the impact of Weba Chute Systems custom solution

Comminution of minerals, Diamond mining, Mineral processing, Mining equipment, , , , , ,

Faced with a challenge of large rocks in the run-of-mine (ROM) feed regularly damaging main support structures, chutes and a grizzly feeder, a diamond mine in Botswana reached out to Weba Chute Systems to design a solution to overcome this costly challenge, which included major safety hazards.

According to Hilton Buys, Regional Manager at Weba Chute Systems, the mine’s existing chutes at the ROM section were cracking and breaking under the barrage of heavy kimberlite rocks measuring up to 1 m in diameter.

“Even the robust grizzly feeder could not withstand the impact of these rocks, which were free-falling about two metres from an apron feeder before contact,” Buys said. “Apart from the costs incurred by this damage, the transfer points were posing a significant safety hazard to mine employees.”

The solution – designed and manufactured at Weba Chute Systems’ Wadeville facility – was a special four-tonne swing door in a discharge chute, feeding from the apron feeder to the grizzly. The heavy, fabricated door is strong enough to withstand the impact while absorbing the energy of the falling rocks before allowing them to drop onto the loading section of the grizzly. The feed can then move in a more controlled manner over the grizzly into the crusher below.

“The key principle was for the door not to give way easily, thereby reducing the velocity and momentum of the large chunks,” Buys said.

There was also a design requirement to accommodate the movement of smaller rocks. This was dealt with through the addition of a second door, to also ease these rocks onto the grizzly to ensure a more gradual feed into the crusher feed chute. The success of the design, which is based on the Weba Chute Systems principle of controlled flow, has been demonstrated in the chute’s ability to operate with very little maintenance, he says. The only components needing regular attention are chute lips and swing door rails.

“We also included some specific design elements in the crusher feed chute, by installing impact rubbers,” Buys said. “Any rocks that may diverge from the main flow stream will then strike this rubber, minimising the vibration and impact on the body of the chute and are still able to drop gently into the crusher.”

Following on the success of this design, the solution was repeated at other customers’ sites, including mines in the Northern Cape which experienced similar challenges.

Weba Chute Systems solves choking problem at Botswana diamond mine

Comminution of minerals, Diamond mining, Equipment maintenance, Mining equipment, Mining services, , , , ,

Weba Chute Systems has come to the rescue of a large Botswana diamond producer suffering from continuous chute maintenance with a customised solution that came with a 12-month guarantee.

This primary crusher discharge chute had been a headache for the company, with the crunch coming when, after considerable capital expenditure, the new conventional chute needed maintenance just six weeks after installation.

Hilton Buys, Regional Manager at Weba Chute Systems, said: “This could not continue and the mine needed a long-term solution which is why we believe they came to us for a proposal. Senior experts from our company visited the site to take a careful look at the conditions the chute needed to deal with, and we took our conclusions back to our design office.”

Among the challenges were large lump sizes in the ore stream, contributing to build-up of material in the chute and regular choking, Buys said. Also, while Botswana’s dry season is long, the rain that does fall causes considerable problems to the flow dynamics. The kimberlite on the mine – depending on which part of the pit it comes from – can become very sticky in wet weather, according to the company.

“We therefore had to pay particular attention to flow angles, and the design had to effectively accommodate both wet and dry conditions,” Buys said. The concept design – which included quick-release lips on dead boxes – was approved by the mine and the final design, manufacture and successful installation was conducted.

Adding to the complexity was that the feed end of the primary crusher was some 8 m below ground level, while the crusher itself stood about 10 m tall. The chute had to be positioned below the rock box, which stores the material from the crusher discharge, channelling the stream into the Weba chute at a transfer height of 9 m to the conveyor belt.

“The conventional chute also created excessive dust through uncontrolled rock velocity over this considerable transfer height,” Buys said. “By contrast, our chute’s controlled flow meant that the mine did not even have to apply its dust suppression system.”

After installation, Weba Chute Systems gave the customer a 12-month guarantee on this chute, as it does with all its new chutes. This guarantee, which comes with regular inspection reports, assures the customer that the performance will meet their expectations.

“These inspections allow us to monitor wear, so we can advise the customer on what action is required so that they can schedule maintenance and avoid unexpected downtime,” Buys said.

Installed in 2017, the chute is still operating with little maintenance, having been delivered at a highly competitive price compared to the one it replaced.

“Designing a long-lasting chute is not just about creating a box with some reinforcing where you think there will be wear,” Buys said. “It is an endeavour that must be scientific, based on in-depth analysis of material and flow conditions.”

Buys highlighted the importance of asking a range of technical questions about the specific application so the design answers those needs. The latest software and modelling tools are then applied by the Weba Chute Systems team to guide the most effective design.

Weba custom-engineered chutes cut the dust at platinum mines

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Weba Chute Systems says it has been able to demonstrate to platinum mining customers how its custom-engineered chutes significantly reduce dust at transfer points.

Using the latest dust measuring technology, the company has carried out tests at mines in South Africa and Zimbabwe to compare the impact of Weba designs on material flow and dust levels, Izak Potgieter, Systems Manager at Weba Chute Systems, said.

At the site in Zimbabwe, considerable dust levels were created at bunker discharge chutes. Material of up to 500 mm in size was moving through at a rate of 600 t/h.

“The material flow was the biggest factor generating dust in the conventional chute, as material was not flowing as evenly as it should,” Potgieter says. “This created a lot of energy for the dust particles to expand into the surrounding atmosphere.”

The installation of the Weba chute – with its engineered design for optimal flow control – reduced the dust levels by about 40%, according to the company.

“By controlling the velocity of material, the design not only cuts dust creation but also reduces impact and wear for increased productivity and less maintenance downtime,” Weba said.

At the South Africa operation, the tests were conducted at a transfer point in the milling plant where an average tonnage of 190 t/h was being moved. Despite the use of water sprays, the existing chute was still creating considerable dust. The installation of the Weba chute was able to reduce dust levels by 15%, according to the company.

“Dust levels have shown to have a serious impact on human health, especially smaller particle sizes of 0.3 micron,” Potgieter says. “Health effects of dust relate mainly to particle size and dust may contain microscopic solids or liquid droplets that are small enough to get into the lungs and cause serious health problems.”

Spores and contaminants associated with dust and aerosol can also adversely impact human health, causing a range of issues from respiratory infections to toxic exposure, according to Weba.

Weba’s custom-designed chutes find favour in Africa

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Weba Chute Systems’ Wade Vandenberg says mines across Africa are recognising the value of the company’s custom-designed chutes in controlling material flow, extending wear life and reducing maintenance downtime.

The South Africa-based company’s transfer point solutions have made their way into mines across Africa, from platinum to diamond operations, to gold, coal and copper mines.

In addition to mining hotspots including Ghana, Mali, the Democratic Republic of the Congo, Zambia, Zimbabwe and Botswana, Weba Chute Systems have been installed in countries like Tanzania, Mauritania and Eritrea, it says. Authorised Weba Chute Systems agents are deployed to support customers in key countries, while technical experts from the company’s head office in Germiston, Gauteng, South Africa, are on call to assist.

Vandenberg, Weba Chute Systems’ Technical Advisor, Africa, said: “Not only do these operations gain the benefits of controlled material flow in their operations, but they experience, first-hand, how our engineering design extends wear life and reduces maintenance downtime.”

He highlighted that better dust control – a key part of health and safety policies in the mining sector – is another important benefit Weba chutes bring to an operation.

“Our state-of-the-art digital engineering design facilities and expertise makes use of the latest technologies to simulate the specific material flow conditions in each customer’s application,” Vandenberg said. “This allows us to apply our philosophy that no two chute designs are identical, and to scientifically accommodate exact flow characteristics into our design.”

Discrete element modelling allows close control over the flow of material through the chute. This minimises turbulence, reducing the levels of dust created in the working area. It also cuts spillage levels, which, in turn, means a saving of valuable material and less time spent on cleaning activities.

Izak Potgieter, Systems Manager at Weba Chute Systems, said: “We work towards the ISO dust management standards, supporting our customers in managing health and safety in this critical area of transfer points. Our testing measures dust down to 0.03 micron particles, to make sure that our designs meet stringent health-related targets.”

Flow control also creates more material-on-material movement to reduce wear on chute liners, according to Weba. This ensures longer liner life when compared with that of conventional chutes. Custom design and use of simulation technology allow for the wear life to be carefully predicted, based on operating conditions, the company says.

Vandenberg said: “Our technical expertise and solutions-oriented approach mean that customers can always rely on us. When we commission one of our chutes, it is part of an ongoing productivity journey with our customer, no matter where they are located.”

Weba Chute Systems called in for Mexico gold tailings project

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As part of a significant investment to improve its processing facilities and enable the recovery of 40% of the gold that currently sits in its tailings as waste, a mining operation in Mexico called in a leading transfer point and chute systems equipment manufacturer to conduct a thorough assessment on the functionality of existing chutes in the plant.

Weba Chute Systems & Solutions, leveraging its knowledge of material behaviour in chute systems, was tasked with establishing the feasibility of introducing filtered tailings at a rate of 1,200 t/h onto the existing transfer system currently handling waste with a nominal size of 400 mm at a rate of 5,000 t/h.

While the intention is for the filtered tailings to be conveyed when the waste rock is available, it would still mean the same chutes would need to function transferring completely different material, according to Alwin Nienaber, Technical Director of Weba Chute Systems.

“Optimally, one should be able to assess a working transfer chute handling the actual material, however in the case of a feasibility assessment this is not possible, and we therefore started with a review of the test work and studies prepared by independent qualified professional materials handling experts.”

This was done by Weba Chute Systems & Solutions calibrating the material conditions and behaviour using discrete element method (DEM). Nienaber said: “Use of DEM allowed our technical team to model the interaction between individual particles and boundaries and, in so doing, to accurately predict the bulk solids behaviour.”

Access to DEM software allows engineers to predict bulk material flow patterns and flow rates as well as velocity patterns and dead zones within a transfer system, according to Weba. It also provides accurate information on particle distribution in segregation and blending and the impact forces on particles and boundary surfaces, showing wear patterns.

The feasibility assessment included the transfer of sedimentary dry tailings, sedimentary filter cake, breccia dry tailings and breccia filter cake. DEM modelling was carried out considering material on its own and conditions where blended material would be conveyed.

In total, there were four conveyor transfer points that had to be assessed. These included an inline transfer point, a 90° transfer point, a transfer from conveyor to radial spreader intermediate conveyor and then onto the spreader boom conveyor.