Outotec introduces MesoTHERM BIOX process to significantly reduce cyanide consumption in refractory gold ore treatment

Traditionally, cyanide consumption with conventional bio-oxidation residues is higher than with residues produced through other oxidative technologies. The Outotec® MesoTHERM BIOX® process, based on Outotec’s proven mesophile BIOX process, offers an easy, cost-effective upgrade path that can cut cyanide consumption by as much as 50% compared to conventional bio-oxidation.

2020 06 29 091926The Outotec MesoTHERM BIOX process enhances the established mesophile BIOX process by combining mesophile bio-oxidation technology with a higher-temperature thermophile oxidative stage to enable an even more effective overall sulfide oxidation step.

Reduced cyanide consumption and simplified process operation

Outotec MesoTHERM BIOX cuts cyanide consumption by as much as 50% compared to conventional bio-oxidation and significantly reduce the formation of thiocyanate – a common and stable cyanide species traditionally formed as a further by-product. Solubilized species prevalent in the mesophile stage are decanted off in an inter-stage thickening step between the two oxidative processes, simplifying operation of the thermophile stage.

A simple, cost-effective upgrade path

Upgrading to BIOX MesoTHERM is a relatively simple process that involves reconfiguring the circuit with the addition of Outotec’s proven High Rate Thickeners for inter-stage thickening and Outotec OKTOP® Atmospheric Reactors for the thermophile step.

“Our conventional mesophile BIOX process has enabled the production of over 25 million ounces of gold to date. This novel process takes advantage of these proven technologies to help our customers achieve significant cost savings while also reducing their environmental footprint,” says Craig van Buuren, Senior Process Engineer, Outotec.

Key benefits

  • Reduces cyanide consumption by up to 50% and lowers reagent storage requirements
  • Produces cleaner BIOX product solids
  • Offers easy, cost-effective upgrade for existing BIOX operations
  • Based on proven technologies and standard processing equipment

For more information, please visit

Outotec develops leading technologies and services for the sustainable use of Earth’s natural resources. Our 4,000 top experts are driven by each customer’s unique challenges across the world. Outotec's comprehensive offering creates the best value for our customers in the mining, metal, and chemical industries. Outotec shares are listed on NASDAQ Helsinki.


Outotec received a grinding mill order from Kazakhstan’s largest gold miner RG Gold

Outotec has signed a contract with Kazakhstan’s largest gold miner RG Gold for the delivery of two grinding mills for the Raygorodok gold mine in northern Kazakhstan. The contract price is not disclosed, but deliveries with similar scope are typically worth approximately EUR 10 million. The order has been booked in Outotec’s 2020 first quarter order intake.

2020 02 17 094223Outotec’s delivery includes two ball mills with associated ancillaries and spare parts to the customer’s carbon-in-leach plant expansion project. The ball mills feature the newly released Outotec® Polymer Hydrostatic Shoe Bearing (HSB) system, which improves grinding mill availability and simplify maintenance. Deliveries are scheduled for 2021.

The Raygorodok gold deposit is one of the largest gold deposits in Kazakhstan with 6 million ounces of estimated reserves.

“We are committed to working closely with our customers to keep the mining industry moving even during these exceptional times," says Paul Sohlberg, head of Outotec’s Minerals Processing business.For further information please contact:


Paul Sohlberg, interim President - Minerals Processing business unit
tel. +1 289 983 0362

Outotec develops leading technologies and services for the sustainable use of Earth’s natural resources. Our 4,000 top experts are driven by each customer’s unique challenges across the world. Outotec's comprehensive offering creates the best value for our customers in the mining, metal, and chemical industries. Outotec shares are listed on NASDAQ Helsinki.


Retaining the edge

~ Navigating bearing retainer design options~

In mathematics, Pascal’s triangle is an arrangement constructed by summing adjacent elements in preceding rows. It has applications in algebra, probability and is a useful model for calculating combinations — commonly referred to as “n choose k”. Here, Chris Johnson, managing director at specialist bearing supplier, SMB Bearings, explains how to navigate the seemingly endless choices in the bearing design process.

If a design engineer wanted to choose any four bearing components from a group of 20 design options, the possible number of combinations would be a whopping 4845. Suddenly, choice overload stunts any kind of decision-making process, when purchasing bearings.

An exploded view of a standard bearing clearly shows its main physical components: the closure, the inner and outer raceway, the balls and the optional retainer. But with four important physical design decisions to make and an increasing number of innovative possibilities, how do design engineers choose the best options for their application?

The best place to start is to consider the environment and specific conditions the bearing will be operating in. A bearing’s inner and outer raceway, balls, retainer and closures may be fabricated from different materials, yet must function effectively in unison. For example, a food and beverage grade bearing may have acetal resin (POM-C) rings, a nylon (PA66) retainer, balls made from 316 stainless steel or glass and a contact seal consisting of nitrile/BUNA-N rubber bonded to a metal washer. This combination would provide good contamination protection and corrosion resistance.

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Are retainers necessary?

Often a crucial feature in bearing design, retainer options are often an afterthought when purchasing bearings. But they shouldn’t be. Retainers or cages perform a fundamental job. They are designed to keep the balls evenly spaced around the raceway and help retain grease around these elements.

They aren’t always required though. Bearings without a retainer have more balls and are called full complement bearings. This increased number of balls allows these bearings to withstand heavier loads and cope with impact or shock, as the load can be distributed more evenly around the raceway. However, full complement bearings experience additional friction and are generally not suitable for high speed applications or axial loads. Once the more popular design option, full complement bearings are now less common thanks to the advancements in steel technology.

Choosing your retainer

Metal retainers are the most common type and suit most applications. They can be manufactured from carbon steel or stainless steel and come in either a crown or ribbon form. A riveted steel ribbon retainer should be used for high vibration applications due to its greater strength. Crown metal cages are used primarily on smaller miniature bearings and thin-section bearings, where space is more limited. Whereas a crown type is guided by the inner ring, a ribbon type retainer is mainly ball guided.

Certain applications, such as MRI scanners, where non-magnetic properties are required, call for an entirely non-metal bearing with a non-metal retainer. While these may be more costly, non-metal retainers are often necessary and can increase a bearing’s lifespan in the long run.

Applications where retainer selection must be carefully considered are those involving temperature extremes. A nylon or polyethylene retainer will not cope with temperatures above 100-120°C. In applications that exceed these temperatures, the retainer will lose strength and lead to early bearing failure. A stainless-steel retainer can be used up to 300°C and will equally maintain its strength under -40°C as will PEEK and PTFE retainers. At extremely low temperatures, a nylon or polyethylene retainer will not perform well and will become brittle so 316 stainless steel and PTFE are favoured.

Similarly, a nylon or polyethylene retainer will be affected by certain chemicals and corrosive environments. These materials will cope better than stainless steel with some chemicals, but not as well with others, so this must be assessed on an individual basis. These synthetic retainers do however offer better resistance to water and salt water than stainless steel retainers, making them the best choice in marine environments.

Polyether ether ketone (PEEK) and polytetrafluorethylene (PTFE) retainers are often used in corrosion resistant bearings used in aggressive environments as these materials are highly corrosion resistant. This is an essential consideration for bearings in chemical or pharmaceutical environments.

Reinforced nylon retainers have good sliding characteristics and will cope better than metal retainers at very high speeds. They also produce fewer fluctuations in running torque and can increase maximum speeds by up to 60 per cent.

In many instances, retainer material choice will be led by the raceway material choice. To prevent non-useful friction, increased wear and premature equipment failure, it is important that the bearing retainer doesn’t have too much radial movement, so it needs to be guided by either the balls or one of the rings. Plastic bearings usually have nylon retainers and full ceramic bearings normally have PEEK retainers, PTFE retainers or have no retainer at all.

While having 4845 design options, may initially seem like an impossible number. By asking the right questions and considering your environmental conditions carefully, it quickly becomes manageable to eliminate unsuitable design combinations and deduce the best matches for each individual bearing design.

For further information on nylon, polyethylene, PEEK, PTFE or metal retainer design options, visit the technical area of the SMB Bearings’ website or contact a specialist:

About SMB Bearings: SMB Bearings originally specialised in miniature bearings, thin-section bearings and stainless steel bearings. By natural progression, the company expanded the range to include other corrosion resistant bearings such as plastic bearings, 316 stainless bearings and ceramic bearings.

Remaining a specialist business, SMB Bearings provide a high level of product knowledge, providing bearing and lubrication solutions to existing or potential customers, whether individuals or large corporations. SMB Bearings does not just sell bearings, but helps to solve your problems.

For further information please visit


Outokumpu appoints Heikki Malinen as President and CEO

Outokumpu’s Board of Directors has appointed Heikki Malinen, M.Sc. (Econ.), MBA (Harvard), as President and CEO of Outokumpu and the Chairman of the Leadership Team. He will join the company on May 1 and assume his role as the CEO on May 16, 2020. Heikki Malinen has previously worked as CEO in Posti Group Corporation and in Pöyry PLC. Prior to these, he has held various leadership positions in UPM in the USA and in Finland. Malinen has been a member of the Outokumpu Board of Directors since 2012, and due to his appointment, he will resign from the Board at the end of April.

2014 09 11 121016 outo logoKari Jordan, Chairman of the Outokumpu Board of Directors: “Following an extensive international search process, Heikki Malinen singled out as the top candidate for the CEO position due to his previous CEO roles in demanding environments, as well as international experience in sales and process industry. His long Board membership in Outokumpu naturally is an additional advantage providing profound knowledge and understanding of Outokumpu’s business. I am confident that as the CEO Heikki will be a great asset to the company.”

“I am honored to get the opportunity to lead Outokumpu which is a global leader in the stainless steel industry. Thanks to the transformation that has been carried out during the past four years, the company is in a good shape with world-class assets and motivated, skilled employees,” says Heikki Malinen. “Being a Board member for eight years gives me a strong background for my new position – I know the company and the management, and I am looking forward to developing the company further and through this create value for our stakeholders.”

As announced earlier, Roeland Baan will leave his position as President and CEO of Outokumpu on May 15, 2020.

“On behalf of the entire Board of Directors, I would like to thank Roeland Baan for his contribution to Outokumpu’s improved operational and financial performance and I wish him all the best for the future,” says Kari Jordan.

Outokumpu is the global leader in stainless steel. We aim to be the best value creator in stainless steel through customer orientation and efficiency. The foundation of our business is our ability to tailor stainless steel into any form and for almost any purpose. Stainless steel is sustainable, durable and designed to last forever. Our customers use it to create civilization’s basic structures and its most famous landmarks as well as products for households and various industries. Outokumpu employs 10,000 professionals in more than 30 countries, with headquarters in Helsinki, Finland and shares listed in Nasdaq Helsinki.


Small components play a large role in medical equipment

Several of the companies within the Lesjöfors Group have many years of experience supplying the medical industry. We would like to introduce some examples of spring products specially manufactured for this industry of current interest.

Highly demanded medical components

European Springs & Pressings in the UK is one of the Lesjöfors companies with customers in the medical industry. Their medical range includes springs that go into the mouthpieces for ventilators, catheter clips to syringe drivers, patient beds and trolley systems, instrumentation and numerous electrical components for medical technologies including defibrillators. ESP manufacture the largest range of springs and pressings in the UK and have some of the most advanced high-volume machinery available. At peak, the machines can manufacture 5 million springs an hour and specific production lines have been repurposed and upscaled to manage orders.

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Stuart McSheehy, Managing Director comments on the situation: “We have developed tooling and manufactured medical components for the healthcare sector for decades but today’s climate and subsequent increase in demand has highlighted the market share with which we and our customers operate in. Normally validation as a new supplier takes months of trials before volume production but in this very abnormal period we’ve been fast-tracking processes to suit our customers and are beyond proud to be able to play a supportive role in today’s climate.”

Other medical spring solutions

Below is a selection of other spring solutions for the medical industry signed Lesjöfors:

Cleanliness and hygiene

Our companies that supply components for the healthcare technology and medicine industries meet the highest demands of cleanliness in products and manufacturing environment. Since Lesjöfors has sales and production facilities in many countries worldwide, we can assure deliveries.

Contact us for medical requirements

We have well-established relationships with many med-tech companies which we regularly meet e.g. at exhibitions like Medtec Ireland. Nevertheless, we can assist many more customers within this field with customized solutions for springs, gas springs or pressings.

Lesjöfors is one of the leading spring suppliers with internationally well known customers. The products are demanded in many markets, in diverse industries. The assortment of springs, stampings and pressings has a unique range, where one of the largest selections of standard springs are combined with high-tech, customized solutions. Lesjöfors has both manufacturing and sales offices in several European countries, Asia, United States and Mexico.