Tag Archives: OTR tyres

Techking custom-made tyres hit the ground at Rio Tinto WA operations

Equipped with Techking custom-made tyres 23.5R25 ETD2S, XCMG XC958 front-end loaders have arrived at Rio Tinto’s operations in Western Australia to begin transporting ore to cargo ships.

To gather user feedback on these tyres, Techking Australia branch business employee, Steve Coles, made a recent site visit.

The tyre model is specially designed for XCMG XC9 series high-end loaders to undertake ore transportation tasks. By adopting proprietary formula and chevron patterns, these custom-made tyres dramatically improve performance in cut resistance and overall sidewall strength, achieving a longer life cycle under special working conditions.

Allen Zhuo, an XCMG Field Service Engineer, told Coles that the Techking tyres and XCMG loaders had been put into use at Rio Tinto’s operations and were, at present, working well.

The delivery of customised tyres for XCMG loaders marks the second time Techking has rendered tailored tyre services to two international giants.

“This is another milestone made towards Techking’s goal of becoming a leading global tyre solution supplier for large mining machinery,” the China-based company said.

While Coles was visiting Rio Tinto, a test report with satisfactory results was received regarding the 27.00R49 SUPER ROCK tyres. These tyres were customised for Komatsu 785 rigid dump trucks working at a Rio Tinto copper mine in Mongolia.

“It is shown from the tracking data in March that the 27.00R49 SUPER ROCK tyres have reached an average service life of 4,201 hours to date and could go beyond Rio Tinto’s expectation by reaching an estimated service life of 10,406 hours,” the Techking field service engineers’ report read.

Michelin takes on more of the load with new rigid dump truck tyres

Michelin North America has completed the MICHELIN® X®TRA LOAD line-up with the addition of the 21.00R33 tyre dimension for 50 ton (45 t) payload rigid dump trucks.

The new MICHELIN XTRA LOAD GRIP™ and the MICHELIN XTRA LOAD PROTECT™ tyres allow users to increase load capacity by 10%, or accommodate more distance per hour to maximise productivity, the company says, adding that both the GRIP and PROTECT tyres will be offered in A4 and B rubber compounds.

Sarah Robinson, B2B Mining Marketing Manager for Michelin North America, said: “The MICHELIN XTRA LOAD tyre line is complemented by the MICHELIN XTRA DEFEND line for articulated dump trucks. This Michelin offer for transport trucks in quarries and mines provides a modern solution to maximise the amount of material loaded into these trucks while still delivering traction, damage resistance and increased tyre life.”

The new MICHELIN XTRA LOAD tyre is available for two surface rigid dump truck applications.

The MICHELIN XTRA LOAD PROTECT is for hard, sharp, abrasive conditions on flat, dry surfaces, where the priority is protection and damage resistance – conditions often found in quarries and construction sites. This application is for customers who want to carry up to 10% more load or increase the distances they carry up to a maximum speed of 34 km/h, according to the company.

With an 8% longer wear life, the revolutionary tread pattern contains a greater volume of tread rubber and has better load distribution across the contact patch, Michelin says. “The interlocking blocks and improved heat dissipation yield a cooler running tyre that allows increased speeds,” it says. “Corrosion-proof cables within the tyre structure increase aggression resistance.”

The MICHELIN XTRA LOAD GRIP tyre is for soft, loose, muddy ground conditions in mining and quarry operations on slopes and inclines, where the priority is high grip and traction. A reinforced casing gives the tyre a 10% more load capacity per machine – a huge increase in productivity when multiplied by the number of cycles made daily, the company says.

The tread is comprised of 30% more biting lug edges, which improves braking, cornering and acceleration in loose ground conditions. The tyre can also handle speeds up to 34 km/h thanks to cooler internal running temperatures, Michelin says. The tyre also provides 8% longer wear life with more rubber in the contact patch and improved damage resistance with corrosion-proof steel cables, according to the company.

For the XTRA LOAD PROTECT, the tonne miles per hour (TMPH) is increased by at least 9.3% and up to 69% depending on the specific compounding when compared with previous Michelin ranges, the company says. For the new XTRA LOAD GRIP, the TMPH is increased by at least 4% and up to 31% depending on the specific compounding when compared with previous Michelin ranges.

“This extended load and speed capability will allow users to optimise machine cycles and increase productivity,” Michelin says. “Greater volume of tread rubber in contact with the ground contributes to better load distribution, improved wear resistance and increased tyre life.”

The XTRA LOAD series is also available in sizes 18.00R33 and 24.00R35, the company added.

Nitrogen tyres and oxygen generators bring safety and sustainability to mines

David Cheeseman*, Chief Engineer of Oxair Gas Systems, believes the mining industry should take on board the latest on-site gas generation technology to help improve safety and reduce its carbon footprint.

The mining industry is becoming a lot more technology-focused, with advancements in autonomous mining technology and automated surface vehicles, as the industry presses ahead to reduce carbon emissions and boost safety in mining.

The International Council on Mining & Metals’ (ICMM) Innovation for Cleaner, Safer Vehicles (ICSV) initiative – a supply chain collaboration with original equipment manufacturers (OEM) – is to be applauded. However, in the meantime, rugged terrain will still be taking its toll on the tyres of mining vehicles, which are the workhorses of the extraction process.

These trucks operate in harsh environments and extremes of temperatures, which is why nitrogen-filled tyres are ideal, because they remain inflated for longer and are more resistant to hot climates and freezing at high altitudes, making them safer for operators and site staff alike. Unlike compressed air, nitrogen is an inert gas that does not react with other materials, so it is resistant to corrosion and, therefore, provides an extra tier of safety where critical applications are involved.

It is imperative that tyres are fully inflated to reduce the risk of critical air leaks and rapid deflation when the vehicles are under pressure. But being at the mercy of the supply chain for bottled nitrogen, especially in extreme locations where conditions are challenging, is costly. Nitrogen can be difficult to transport, not to mention the additional carbon footprint of delivery vehicles and safety risks for staff manually moving cylinders from one place to another, especially with the new threat of contamination posed by the coronavirus pandemic.

However, companies can avoid the hassle of having to outsource their gas from conventional cylinders by switching to an on-tap supply through a nitrogen generator. A nitrogen generator on site is the ideal alternative choice to manhandling canisters for heavy-duty equipment where precise or constant pressure is vital.

Oxair’s nitrogen generators are efficient and compact, making them an ideal solution for mining sites. They offer a continuous flow of gas extracted from the atmosphere and are an environmentally friendlier method of delivery, as they reduce the carbon footprint associated with having

Oxair’s nitrogen generators are efficient and compact, making them an ideal solution for mining sites, David Cheeseman says

cylinders transported from an off-site facility and then the return journey when they are empty.

Nitrogen generators are cheap to run and, once installed, require minimal maintenance. Nitrogen plants are built to last and are operator friendly, making them crucial where tyres need to perform well in a remote location or challenging environment.

As with all high-quality engineering solutions, nitrogen generators can be tailored exactly to suit an individual mine’s requirements. They can be designed for outdoor or covered facilities and, as well as offering low energy consumption, a supplier should be able to provide on-site training to enable local employees to properly calibrate and easily maintain the system once it is operational, as well as full ongoing maintenance support.

Some of the world’s leading gold mining companies are already seeing the benefits of gas on tap at sites rather than taking deliveries of traditional cylinders. Pressure Swing Adsorption (PSA) oxygen equipment supplied by Oxair is helping AngloGold Ashanti extract more of the precious metal from one of its flagship gold mines, potentially extending the life of the open-pit operation in Tanzania.

Two booster processors for increasing oxygen pressure and two oxygen generator tonnage plants to further improve the efficiency of the leaching process are in operation at AngloGold’s Geita Gold Mine, enhancing gold recoveries and protecting the environment by reducing cyanide consumption.

This equipment is helping to increase production and extend the mine’s lifespan beyond 2025, when it was originally set for closure. The state-of-the-art equipment supplied, which includes upgraded control systems, will double the reliable source of pure oxygen for the future activities planned at Geita. It will mean significant efficiencies in carbon in the leach technology method of gold recovery and should help the mine be both economically and environmentally sound for its extended lifespan.

Using oxygen generators significantly improves the gold dissolution process through adding highly purified oxygen at the slurry stage of leaching. Mined rock is usually ground up and turned into a slurry by adding lime, cyanide, oxygen and water before being fed through a carbon bed to extract the gold. Incorporating highly purified oxygen allows cyanide to work more efficiently and, thus, reduces the quantity of cyanide needed in the process.

A PSA tonnage plant takes oxygen directly from the air using on average of only 3 kW of electricity per 100 cu.ft of oxygen produced and transforms it into highly purified oxygen by removing nitrogen entrainments (which are useless to the leaching process).

Using oxygen generators significantly improves the gold dissolution process through adding highly purified oxygen at the slurry stage of leaching

Oxygen tonnage plants are designed for on-site applications requiring large amounts of oxygen, such as mining, with outdoor or covered standard installations – PSA equipment is bringing numerous advantages to the mining industry, as well as eliminating the need for expensive and unreliable deliveries of liquid or cylinder oxygen.

On-site generators provide mines with a turnkey solution for getting a constant, reliable source of high-quality oxygen and nitrogen where it is needed. It is clear that with responsible mining practices geared up for long-term sustainability, investments in quality equipment will be key to achieving both safety and sustainability goals.

*This piece was written by David Cheeseman, Chief Engineer of Oxair Gas Systems. Oxair is an ISO 9001 certified company focused on the design and manufacture of packaged oxygen PSA Systems, as well as Nitrogen PSA systems up to 1,000 Nm3/h.

MAXAM Mining Group releases new MS412 27.00R49 tyre

MAXAM Mining Group says it continues to innovate, adding the all-new MS412 27.00R49 tyre to its open-pit mining, quarry and OTR program.

Designed to meet the demanding conditions at mine sites globally, the MS412 is the result of cutting-edge engineering and groundbreaking compounding technology, the company claims.

The tyre features a high net-to-gross tread pattern for low wear rates that increase tyre life, while MAXAM’s engineers have strategically placed stone ejectors on the tyres to provide maximum protection from drilling – which can lead to the cause of premature tyre removal and out of service conditions.

Engineered with tread grooves that allow for “exceptional traction and heat dissipation”, the MS412 delivers excellent traction in a variety of haul road conditions, MAXAM says.

To enable high speed operation with minimum heat build-up, MAXAM says it has optimised the MS412’s base compound, thereby maximising productivity for mining operations across the globe.

“Featuring a strong all-steel casing to reduce cuts and punctures, the all-new MS412 is engineered with increased casing durability to dominate severe hauling conditions,” it said.

“As an innovative group, with years of expertise in the mining industry, MAXAM’s engineering team has designed the MS412 with a high lug-to-void ratio for improved wear and impact protection, providing mine sites increased protection and wear on haulage tyres. Similar to all large mining haulage tyres in MAXAM’s program, the MS412 has deep tread grooves to provide cooler running tread and longer tyre life.”

Delivering a premium E4 haulage tyre to the industry, the MAXAM MS412 provides exceptional performance, minimum cost-per-hour and a high net-to-gross pattern for maximum tread wear, the company says.

The MS412 is available in one size, but multiple tread compounds, including the ultra-cut resistant compound that was recently released by MAXAM.

BKT testing new ‘giant’ EARTHMAX SR 468 OTR tyre

BKT says it has welcomed a new “truly giant” product into its range of specialist off-highway tyres with the EARTHMAX SR 468.

Designed to fit on rigid dump trucks, the EARTHMAX SR 468 prototype has, so far, been made in the 40.00 R 57 size and is ready to be tested in coming months by BKT engineers.

The new machinery to make this tyre reached the Indian plant in Bhuj, in January, just before the COVID-19-related lockdown, which affected – at various levels and at different times – the Asian continent. Initially, due to the pandemic, the machinery was not immediately installed. Only after a temporary shutdown of BKT’s manufacturing facilities, necessary to implement a rigorous safety plan for all staff, did activities finally return to full operation, including the installation of the new machinery for the 57 in tyre.

Dilip Vaidya, President and Director of Technology at BKT, said: “It is a very important moment, a giant product has been created which will now be subject to the most rigorous testing up to the spring of 2021, until we are sure we have achieved the highest possible level of quality and reliability, as always. Only when we are absolutely sure we can offer our users the best Earthmax SR 468 possible, will we officially launch the new 57 in giant.”

EARTHMAX SR 468 joins numerous products that make up the EARTHMAX family, a range of radial tyres used on off-road vehicles and equipped with an all-steel structure to provide greater resistance to the casing and, hence, against damage. A winning feature of the EARTHMAX SR 468 is the special tread design and the compound, created to limit the heat generated, BKT said. The E-4 depth of the tread provides extreme resistance in highly challenging conditions, it added.

Goodyear launches new OTR tyre for long haul mining fleets

The Goodyear Tire & Rubber Company has announced its newest addition to its off-highway large haulage product line, the RH-4A+.

Engineered to deliver a lower operating cost per hour and higher productivity in hard-rock underfoot conditions, this tyre features an extra-deep E-4+ tread depth with a high net-to-gross tread pattern and optimised footprint pressure to help provide long hours to removal, according to the company.

The Goodyear RH-4A+ tyre is an important addition to Goodyear’s Total Solution of trusted products, reliable services and fleet management tools – all delivered by a global network, Goodyear said. It helps operators be more productive and operate at a lower cost by providing the following benefits and features:

  • Enhanced sidewall durability and lateral stability with Goodyear’s new Durawall Technology®, wider bead design, and wider moulded rim width;
  • Increased hours to removal and cut protection with its high net-to-gross tread pattern and deep, E-4+ tread depth; and
  • Cool operating temperatures from the tread’s centreline blading, shoulder lug pockets, and shoulder lug side notches.

Field results from trials conducted in April 2019 with global mining customers have shown that the RH-4A+ in 46/90R57 size delivers up to 12% better hours to removal than RM-4B+, Goodyear said.

Eric Matson, Global OTR Field Engineering Manager, said: “Low operating cost per hour is an important requirement for mine operators. Customers also require other performance benefits, such as a tread and casing that, together, deliver long hours to removal, resistance to cutting, and excellent traction in severe, hard-rock underfoot conditions. The new RH-4A+ provides these benefits to help mining fleets optimise productivity and lower their operating costs.”

The RH-4A+ is currently available in sizes 59/80R63, 46/90R57 and 27.00R49 through Goodyear’s global network of authorised OTR dealers. It is available in customised casing constructions and with Goodyear’s proprietary tread compounds to meet hauling conditions.

“Complementing the RH-4A+ is Goodyear’s EMTrack tyre performance tracking software, giving operators the ability to track the tyre’s properties to reduce operational costs,” Matson said. “With EMTrack, mining operators can track the performance of their tyres, including the new RH-4A+, in order to project timing of rotation, replacement and help to manage their inventory.”

REVYRE recycling JV looks to tackle mining tyre problem in Australia, New Zealand

A new joint venture in Australia and New Zealand could see thousands of tonnes of large off-the-road (OTR) tyres used in the two country’s mining sectors recycled thanks to the use of two “revolutionary” technologies.

The Energy Estate and InfraCo partnership, REVYRE, has been established to develop and build innovative tyre recycling plants in Australia and New Zealand, using Vertech/RubberJet Valley tyre disintegration and Tyromer rubber devulcanisation.

Currently Australia disposes of over 60,000 t of end of life tyres (ELTs) by exporting them, with some 100,000 t stockpiled in landfills or stockpiled onsite (predominantly within the mining and agricultural sectors), according to the companies.

“With the COAG agreed ban on used tyre exportation from December 2021, the annual growth in Australia’s tyre stockpile will be even greater,” they said.

New Zealand, meanwhile, currently generates 5-6 million ELTs annually, which equates to close to 70,000 t of tyres. These units are either shredded locally for domestic burning in cement kilns as tyre derived fuel (TDF) or are baled and exported for use as TDF in Asia, according to the companies.

“REVYRE seeks to solve this waste problem through the rollout of its innovative combined recycling technology,” the Energy Estate and InfraCo said. “Its projects are modular, scalable and mobile – a total tyre recycling process that will destruct and re-purpose any constituent parts of a tyre, turning it into a high value polymer product for export and clean high tensile scrap steel. The overall process has near zero waste, emissions or by-products and does not use or produce toxic chemicals.”

The tyre derived polymer, or TDP, will be exported for direct re-use in the tyre manufacturing process, according to the companies.

The process uses no chemicals or solvents, is commercially viable on an industrial scale and is the only known environmentally friendly devulcansation technology, they claim. And, while REVYRE’s solution can address all tyre sizes, it is particularly suited to larger OTR tyres, such as those used in mining and agricultural operations in Australia and New Zealand, the companies said.

“REVYRE’s solution can play a critical part in sustainably managing current and future tyre stockpiles,” they said. “It is a financially attractive and environmentally superior solution relative to alternative tyre disposal options. The REVYRE solution will also support the development of a circular economy for ELTs.”

The plants will seek to procure renewable energy for operations as part of a dedication to maintaining a low carbon footprint and lessening the environmental impact of the tyre production cycle, the companies said.

“Energy Estate and InfraCo are committed to achieving the United Nations’ Sustainable Development Goals and implementing the REVYRE solution will help achieve eight of the 17 SDGs,” they said. “Production of TDP will save approximately 94% of the energy required to produce the virgin compounds it replaces, as well as significant savings in oil used and avoided deforestation.”

Given the scale and locations of Australia’s mining industry, in particular, there is a sufficient tyre disposal requirement to justify at least two to three REVYRE plants in each of the mainland states, the companies said.

Luke Panchal, Director of Energy Estate, said: “Following the tyre export ban from 2021, Australia will have annually 160,000 t of tyres stockpiling that it needs to address. This means the need for environmentally and socially responsible and cost-effective solutions for managing used tyre disposal in Australia is critical – especially for heavy OTR tyres.

“To date, sustainable, environmentally responsible, economic and easy-to-implement recycling options have not been present in Australia. REVYRE delivers this option and is a solution that addresses tyre disposal in a truly circular process with no emissions and without the use of toxic chemicals. It is a solution that makes economic and environmental sense.”

Shaun Zukor, Director and Co-founder of InfraCo and REVYRE said: “We have developed a compelling New Zealand business case with our technology partners from Canada and Europe and we submitted a Provincial Growth Fund application with the New Zealand government in November 2019.

“Our plans are to start locally with our new partners and to expand into Africa and other territories thereby covering a large part of the globe where our presence will have major environmental, social and economic impacts.

“The technology allows a true circular economy and deals with a part of the mining tyre waste stream that has been extremely difficult to dispose of previously.”

Kal Tire gets into the groove with robot-aided Mexico tyre repair facility

Kal Tire’s Mining Tire Group has opened an off-the-road (OTR) retreading plant in the heart of Sonora state’s mining industry, which will be the first of the company’s facilities to use a robot for skiving and tread grooving jobs.

The plant in Cananea, Mexico, officially opened on October 18 and is strategically located as 30% of Mexico’s mines are in the state of Sonora, it said.

This marks the sixth OTR retreading and repair facility for Kal Tire, with the other facilities being in Canada, United Kingdom, West Africa and Chile.

“Retreading is a service we’ve wanted to bring to Mexico for some time because we know from experience with our other facilities that retreading extends tire life and reduces the cost of ownership. Retreading also reduces the impact on the environment,” says Pedro Pacheco, Vice President Operations, Latin America, Kal Tire’s Mining Tire Group. “Our clients see this as an opportunity and look forward to seeing our retread tires in operation.”

Pacheco said the company is looking forward to demonstrating how a “superior retreading technology and process” will renew a tyre’s strong performance and lengthen its lifespan, adding that OTR retreads by Kal Tire often achieve 3,000 to 6,000 additional hours, and allow mines to reuse quality original casings; an additional environmental benefit.

Kal Tire said: “Emissions produced in manufacturing a new tyre are significantly higher than in the retreading process. For example, producing a new 29.5R25 tyre uses 68 litres of oil and emits 4,192 kg of carbon dioxide; retreading the same tyre uses 13.95 litres of oil and emits 2,464 kg of carbon dioxide.

The addition of the robot for skiving and tread grooving will help improve access to custom tread designs to best suit each site’s conditions, according to Kal Tire. The robot technology – a pilot program as Kal Tire begins automating retread operations around the world – also helps ensure team members don’t have to perform the most strenuous steps, the company said

Pacheco explained: “The robot will allow us to switch tread patterns without having to switch tools. The work is done efficiently and lets us make the most of the expertise of our people.”

The 3,000 sq.m plant will be supported by a team of 120 during construction phase and employ 40 people on-site who have been in training for nearly a year to achieve their certification as retread technicians, according to Kal Tire. All plant team members are local residents of Cananea, a town of 30,000. The team aims to be retreading an average of 80 tyres/mth and will increase capacity to meet demand, the company said.

Dan Allan, Senior Vice President, Kal Tire’s Mining Tire Group, said: “We have been proud to serve the mining industry in Mexico for 12 years and we are excited to bring this value-added service to this market to help customers keep tyres in production.

“Retreading reduces a tyre’s operating cost per hour, it reduces new tyre purchases and it reduces the impact on the environment.”

Every year, Kal Tire retreads more than 10,000 tyres and saves thousands of tyre casings from being prematurely sent to scrap piles, it said.

MAXAM Tire extends Large Mining series product line

MAXAM Tire has made three new additions to its Large Mining series of tyres.

The company says it has engineered its haulage tyres (MS401, MS402, MS403) to provide the industry with the “best solution for mining applications”.

It continued: “The Large Mining product line is the result of extensive research and testing in multiple mine locations across several continents.”

In order to meet the toughest application requirements, the new haulage tyres use recently developed compounding and carcass construction, according to the company. “These enhancements allow MAXAM’s Large Mining products to provide the best delivered value, greatest productivity and lowest cost per tonne value of operation,” it said.

Available for haul trucks up to 290 t (320 tons) MAXAM offers three specific tread patterns available in multiple compounds based on site TKPH/TMPH to meet different surface mine application requirements.

The MS401 (pictured) features an aggressive tread design with heat-resistant under tread, ideal for applications that require maximum traction and high site TKPH/TMPH, MAXAM said.

The MS402 has enhanced shoulder lugs and a solid centerline providing increased protection, traction and tread life in haulage applications.

The MS403, meanwhile, integrates an advanced tread design for flexibility in all applications, from smooth haul roads to rough and rocky terrain. “Designed to deliver lowest cost per hour/tonne, the MS403 is the proven solution for the mining industry,” the company said.

Nokian expands underground mining tyre range

Nokian Heavy Tyres says it has collaborated with end users and one of the leading drill manufacturers to expand its range of underground mine tyres.

The Nokian Mine King E-4 underground mining tyre is one of the most specialised products of its kind, according to the company, with “a carefully balanced set of features” to match the challenges encountered in the underground mining environment. It is now available for a wider range of mining vehicles.

Nokian said: “Underground mining sets special demands on the tyres. Not only is the environment physically demanding with its sharp, slippery stones, but the limited machine size in tight spaces and high safety demands must be taken into consideration.”

Besides drill rigs, the Nokian Mine King E-4 tyre can be used on any utility vehicle in underground mines. The tyre’s sturdy structure enables an operating pressure of up to 10 bar, which improves the load capacity. The sharp shoulders and large contact area, meanwhile, improve the grip on slippery, wet stones.

The initial size for Nokian Mine King E-4 was 14.00-20, but in the fall of 2019 the range will be expanded with the sizes 12.00-20 (September) and 14.00-24 (already in August). This makes it possible to use the same tyres in most underground machinery, the company said.

“One of the starting points for designing the Nokian Mine King E-4 tyre was the compact size combined with a good load capacity,” says Eva-Leena Varpe, Product Manager at Nokian Tyres. “This way, the tyre actually helped to optimise the size of a new drill rig model, enabling a more efficient use of space.”

Another important feature of the tyre is the cut and puncture resistance. According to Varpe, it is a sum of two parts: “You could say that half of the durability comes from the tyre design with thick, sturdy pattern and good self-cleaning properties. The other half would be our mining rubber compound, which I think is superior to anything else in the market.

The new sizes will also replace some of the company’s older tyres that will be discontinued, according to Eva-Leena Varpe.