Engineering & Mining Journal

JUN 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 69 of 115

CRUSHER MAINTENANCE 68 E&MJ • JUNE 2018 Miners today are, on average, processing more rock to produce the same amount of metal. The gyratory crushers used to re- duce this material have a great impact on operations, especially downstream processes. Mines rely on them to produce a consis- tent product. Obviously, taking these workhorses down for main- tenance also has a huge impact on operations. One of the original equipment manufacturers (OEM) for crushers will soon roll out a new gyratory model. The improve- ments included in it were based on what the OEM and the mines have learned in the last 20 years. Making the decision as far as replace or rebuild is not always easy. Rebuilding these machines requires an investment and time. Knowing this, extending the time between rebuilds is also something many mines desire. The Mark III Upgrade Metso is planning for a major gyratory crusher upgrade soon. Historically, the biggest improvement for these machines oc- curred with the Mark II upgrade in the 1990s. Dusty Jacobson, senior crushing and screening specialist with Metso, said the amount of upgrades the company is planning equates to the leap from Mark I to Mark II, so they are referring to this as the Mark III upgrade. Depending on the size class, the Mark III upgrade will increase the gyratory crushers capacity by 15% to 20%. For a 6110 machine, which are normally used at mines processing 60,000 tons per day (t/d), the capacity would in- crease from 8,000 t/h to 9,500 t/h or 10,000 t/h depending on the ore." The top size feed for the machine remains about the same, Jacobson explained, but it will be able to handle more of the coarse, top-size material because of an arched spider design. "Material tends to bridge on a straight spider," Jacobson said. "With the arched spider, the joint is lifted vertically and there is less of a chance for the material to hang up at that point. Cus- tomers that have changed from straight to arched spiders have seen a significant decrease in downtime, sometimes as much as 70%, related to bridging." New Options Will Improve Gyratory Crusher Performance In addition to major upgrades, suppliers also offer rebuild service and products to extend wear life By Steve Fiscor, Editor To get the best performance, wear liners need to be properly matched for the application. Above, workers replace concaves on a crusher. (Photo: Columbia Steel)

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