Tag Archives: Christoph Hoetzel

Metso Outotec enhances fine grinding offering with stirred milling portfolio

Metso Outotec’s stirred milling innovations have been bolstered by the introduction of a “comprehensive” portfolio featuring three solutions – Vertimill®, Stirred Media Detritor (pictured) and HIGmill™.

Ideal for grinding finer products, stirred mills are known for their energy efficiency and compact design, reducing floor space requirements and installation complexity. These mills are based on gravity-induced and fluidised technologies, allowing for the optimum equipment solution for all comminution circuits covering secondary, tertiary, fine, ultrafine, regrind and lime slaking applications.

“Stirred milling is an important growth area and integral to our customer’s efforts for sustainable and cost-efficient comminution,” Christoph Hoetzel, Head of Grinding business line at Metso Outotec, said. “With our combined portfolio and our unrivalled experience in this field, Metso Outotec is in the unique position to offer the most suitable solution for any specific application. We are doing this with a holistic view towards efficiency, sustainability, availability and total cost of ownership.”

Metso Outotec stirred mills are suitable for a large range of product sizes. The standardised range includes chamber units of up to 50,000 litres and the world’s largest industry units with up to 6,500 kW of installed power.

All of the company’s stirred mills are part of Metso Outotec’s Planet Positive product portfolio, thanks to the sustainability benefits they deliver.

Vertimill is globally recognised as a market-leading energy-efficient grinding mill.

“Through a low total cost of ownership due to its simple and robust design, it brings substantial improvement to the profitability of concentrators,” the company says.

HIGmill is an advanced, energy-efficient fine and ultra-fine grinding solution that relies on proven technology. With the tall, narrow, vertical body arrangement, grinding media is evenly distributed and mineral particles remain in constant contact, significantly increasing grinding efficiency, the company says. It takes advantage of gravitational forces and GrindForce™ rotor technology to produce a finer grind for mineral liberation.

Stirred Media Detritor (SMD) is a fluidised, vertical stirred mill designed for optimum grinding efficiency for fine and ultrafine grinding products. SMDs have the capacity to operate continuously at full load power draw with no steel contamination of the product, according to the company. They are suitable for both open- and closed-circuit operation.

Metso Outotec addresses standardisation and flexibility needs with new grinding mills

Metso Outotec has, after reviewing the combined horizontal mill product offering from the Metso and Outotec companies, unveiled a “harmonised” Metso Outotec horizontal mill product line that, it says, represent the best of both legacy companies.

The Metso Outotec Premier™ horizontal grinding mills and Select™ horizontal grinding mills are designed for different customer segments and markets, and they have distinctly different features and benefits. In both lines, there are various mill solutions available for a wide range of applications.

The Premier horizontal grinding mills are customisable solutions built on state-of-the-art grinding mill technology, process expertise, and design capability, the company says. The Premier horizontal grinding mills are engineered to “excel and create vast possibilities” for customers and applications.

The Select horizontal grinding mills are a range of pre-engineered solutions that allow simple mill selection, simplified proposal preparation, and a streamlined order execution process. Select horizontal grinding mills feature a suite of technologies and conservative design parameters that meet or exceed operational goals, Metso Outotec claims. Select horizontal grinding mill sizes are available for applications up to 7.8 MW for both the SAG and ball mills. Rod mills are available up to Ø4.60 m x 6.10 m EGL.

“With the introduction of the Premier and Select horizontal grinding mills, Metso Outotec continues its over 100-year legacy in grinding,” Christoph Hoetzel, Head of Grinding business line at Metso Outotec, says. “Both lines have their own differences and benefits – but share the concepts and expertise that have made us an industry leader time and time again.”

He added: “As a combined company we have consistently led the way in grinding mill innovation. We’ve continuously pushed mill technology in the next size increment. Currently, we have the largest operating mills in the world, and we want to lean on that legacy in taking the next steps in mill size. In addition, it is important for us to continue to be a frontrunner in the development of a more robust suite of horizontal mill technologies, providing desirable options for customers looking for quick execution with reliable technology.”

The company says the Premier and Select mills come ready to be integrated with its mill reline equipment and full mining portfolio. The former includes the recently launched Mill Reline Machine (MRM), which has a capacity of 4,000 kg, as well as a broad selection of liner options, including the Megaliner™.

Metso Outotec ticks the TCO box with latest HRC HPGR design

The design and operating principle of Metso Outotec’s HRC high pressure grinding roll has been well proven since going commercial in 2014.

The elimination of the edge effect with a flange design brings with it high throughput, while the anti-skew assembly means customers find faster machine restarts and no downtime from skewing events.

These benefits have been proven at Freeport McMoRan’s Morenci mine, in Arizona, USA, with the company’s largest unit – a HRC 3000 – having now processed more than 120 Mt of ore at that operation. This HRC 3000 is still going strong.

Yet, there was room for improvement, hence the reason Metso Outotec has just released the HRC™e HPGR.

Christoph Hoetzel, Head of Grinding business line at Metso Outotec, explained the rationale for such an update.

“To enable this flange technology, it was very important to have a simple, mechanical solution that works under any circumstances,” he told IM. “Our solution with the HRC was the arch frame, which was a mechanical fix to keep the rolls parallel at all times.

“This, however, came with a compromise. You had to have access to both sides of the machine and, in general, the units were relatively heavy and tall.”

These attributes meant that, if the customer investigated the total installed cost of the HRC – especially if they were weighing the purchase of more than one unit – the cost sometimes outweighed the benefits.

“This was a case of where the economics did not match the sustainability and efficiency of the unit,” Hoetzel said.

Metso Outotec has listened to customer feedback with the HRCe.

“The enabling factor for the flange technology is a mechanical solution for eliminating skewing on the machine,” Hoetzel said. “We have now achieved this with a much simpler, compact design. This is really where the step change has come from.”

Now, when you look at the specifications of the HRCe, which comes with a large feed size acceptance of 60-120 mm and typical capacities of 1,810-6,930 t/h, the footprint is almost the same as other HPGRs on the market, according to Hoetzel.

“Yet, the unit benefits from the proven and reliable flange design of the original HRC,” he said. “You could, potentially, even use a smaller unit for the same application.”

By reducing the size and associated installation cost that comes with the HRC technology, Metso Outotec is suddenly levelling the HPGR playing field. The advantages the company spelt out back in 2014 when the HRC technology was originally publicised now come with no cost drawbacks.

With more miners looking for not only energy-efficient grinding solutions in their flowsheets, but processing options that reduce their water intake, HPGRs are increasingly being used in tertiary or quaternary crush applications, or in lieu of traditional SAG mills.

In this regard, an updated HPGR is coming to the market at just the right time.

Metso Outotec, cognisant of this trend, has also sought to offer the benefits of its HPGR technology to the wider market.

The mechanical skew control HPGR (High Pressure Grinding Roll) retrofit kit takes the key components responsible for minimising skew from the HRC and makes the technology more accessible without the major investment or need to acquire a new machine, according to the company. The technology can also be incorporated into non-Metso Outotec machines.

These latest product updates are in keeping with Metso Outotec’s defined purpose of “enabling sustainable modern life”, fitting the mineral processing reality that miners face today.

Hoetzel reinforced this message: “Customers should not have to choose between sustainability and lowest total cost of ownership with their machines. At Metso Outotec, we truly want to be the partner for positive change, which means we really need to combine both.

“With the HRCe, we think we have achieved that.”

Metso Outotec delivers ‘next evolution’ in high pressure grinding rolls with HRCe

Metso Outotec has launched the “next evolution of the high pressure grinding roll”, with the delivery of its HRC™e HPGR.

The original HRC HPGR was launched back in 2014 by Metso (now Metso Outotec), pioneering the use of flanges and non-skewing design. The grinding performance that brings energy efficiency, lower circulating loads and increased throughput is now strengthened with an additional evolution in design, Metso Outotec says.

The new HRCe comes with a decreased installation capital expenditure compared with the original HRC. Changes in design allow for maximum productivity with proven technology that leads to superior grinding efficiency.

Christoph Hoetzel, Head of Grinding business line at Metso Outotec, said: “We are very excited about the new HRCe, which combines proven technology and customer-focused evolutions. Metso Outotec is the only OEM that has been able to design and develop reliable flanged HPGR technology that has demonstrated superior performance for many years in the mining industry. We will continue utilising our proven technology but have evolved the design to maximise value for our customers and superior grinding efficiency.”

The high throughput comes from the elimination of the edge effect with the flange design, which will ultimately maximise the amount of crushed material, the company says. With the anti-skew assembly, customers will find faster restarts and no downtime from skewing events, according to Metso Outotec.

The HRCe also comes with a large feed size acceptance of 60-120 mm and improved energy efficiency compared with similar HPGRs, the company says. It also boasts typical capacities of 1,810-6,930 t/h.

Key benefits of the new HPGR include:

  • Improved energy efficiency of up to 15%;
  • Lower circulating load of up to 24%;
  • Increased throughput of up to 19%;
  • Elimination of edge effect from combination of proven flange design and anti-skew assembly; and
  • Elimination of downtime caused by skewing events.