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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CRUSHER MAINTENANCE JUNE 2018 • E&MJ 69 SOME THINK LONG-DISTANCE TRANSPORT IS INFRASTRUCTURE- INTENSIVE. WE THINK DIFFERENT. Transporting materials from remote locations has traditionally required signifi cant infrastructure invest- ments in road or rail links, vehicles, personnel and fuel. BEUMER off ers an economical, effi cient and environmental alternative – long-distance overland conveying. This gives you a dedicated, around-the-clock transport link at the fraction of the cost of infrastructure development. The reduced noise and air pollution minimises environmental impact and improves personnel safety. Add to that a high degree of design fl exi bility and customisation and you can see why overland conveying makes a big diff erence to operational effi ciency and environmental protection. For more information, visit There are several mechanical upgrades rolled into the Mark II upgrade. "Many of these improvements are best practices learned over the last 20 years," Jacobson said. "They are mostly related to reliability and improved maintenance and the other changes that were required to increase the speed and power of the machine." From a maintenance perspective, Metso will improve the seals on the pinion shafts. Other improvements are planned for wear components, which require regular maintenance and usually pose the most downtime. "We have a new tool, the Con- cave Carousel, that allows technicians to remove an entire row of concaves," Jacobson said. "Our new jack-bolt style locknuts are another big improvement." All these changes are geared toward getting longer life from the concaves and the mantle itself. They do not necessarily im- prove how the machines are maintained. However, if the mine can get six months life from a mantle instead of five months, that makes a big difference. Metso has also advanced its chamber optimization program (CHOP), which reviews the material being fed to the machine. "CHOP scans the profiles before and after, generating a wear profile throughout the life of the liners," Jacobson said. "It tags that to the mechanicals along with the tonnage, power draw and forces within the machine to develop better wear profiles, allow- ing liners to last longer, while keeping the machines within its mechanical limits for longer periods of time." New tools will also improve safety for maintenance-related tasks. "We have a new hydraulically powered eccentric cart," Ja- cobson said. "It's a safer, simpler option than a scissor life when dropping the eccentric from the bottom of the machine." And, for wear-component replacement, Metso has redesigned the concave trays lessening the need for technicians to enter the machine. By processing more rock with crushers, which are efficient machines in general, the mill can reduce the downstream load. "For any SAG or primary milling circuit, the more we can do with the crushers on the front end, the more we can improve overall plant efficiency by being able to crush better and finer," Jacobson said. "The material handling equipment between the primary crusher and the plant is directly affected by how many slabs and coarse blocks come out of the machine." The Mark III upgrade also includes a visual analysis system to limit the possible downstream damage. Gold Mine Retrofit CMS Cepcor recently completed a major rebuild, conversion, installation and commissioning of a Sandvik CH660 crusher to a CS660 for a large gold mining company. After crushing mil- lions of tons of gold ore, the mine delivered its decommissioned CH660 to CMS Cepcor's Coalville crusher service facility for a major rebuild. According to the company, the mine selected CMS Cepcor because its rebuild and conversion proposal offered significant cost savings versus purchasing a new crusher. Following detailed inspection and testing, the bottom shell was deemed serviceable and was then processed through the CMS Cepcor component rebuild program, where it would un- dergo all the necessary repairs to return it to original factory tolerance for use in the conversion. Ultimately to convert the crusher from a CH (Hydrocone type crusher) to a CS (Superior type crusher), CMS Cepcor had to sup-

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