Capital Equipment News June 2019

ON SITE – CRUSHING AND SCREENING

Up to the task

Crushing and screening contractor, Casmar Mining, has deployed a pair of its large Sandvik mobiles to help Chilwavhusiku Colliery supplement its coal volumes while building a new plant on site, writes Munesu Shoko .

A train of Sandvik mobiles is up to the task of crushing high-grade coal destined for export markets at Chilwavhusiku Colliery, a fully black- owned mine based in Bronkhorstspruit. To sup- plement volumes during the commissioning of a new plant, the colliery sought the services of Casmar Mining, a well-respected name in the contract crushing and screening space. Casmar Mining has been on site since October 2018. To execute the task at hand, Casmar Mining has deployed its Sandvik QJ341 jaw crusher and QE441 scalping screen. The Sandvik QJ341 is the largest in the Sandvik premium range of tracked jaw crushers, while the QE441 is also the largest heavy duty scalper in Sandvik’s premium range of equipment. Run of mine (ROM) material is fed into the two-deck QE441 scalping screen. “We are pre-scalping before crushing because the ROM has a lot of fines. Only oversize material reports to the jaw crusher,” explains Deon Engelbrecht, Casmar Mining’s site manager. The first deck of the QE441 screens out -50 mm material, and the bottom deck screens out -25 mm material. The jaw crusher is set on a 50 mm closed side setting, and produces a well-accepted percentage of -50 mm product.

High throughput Engelbrecht says the two machines were specifically deployed on the project because of their high throughput capability, which allows the contractor to meet the high production requirements of the project. “The machines are running very well. We are producing between 1 500 t and 1 700 t per shift (6am to 6pm),” says Engelbrecht. The QJ341, featuring a 1 200 x 750 / 47 x 29” jaw, is capable of delivering high outputs with sound reduction ratios. It comes fitted with many user-friendly features, such as hydraulic adjustment and a reversible jaw, as well as a PLC control system and colour screen for ease of operation. It is also fitted with a hydraulic raise and lower conveyor, making it ideal for coal, as well as recycling and quarrying applications. Some of the key benefits of the machine include the Danfoss hydraulic control system for greater efficiency with all controls located at ground level for ease of access and maintenance. The full PLC control system and Danfoss colour screen allow visual data output of all plant operating parameters. The QJ341’s load control system for feeder drive ensures

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