The Asia Miner

OCT-DEC 2016

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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Volume 13 • Issue 4 | 2016 | ASIA Miner | 29 Sponsored Content mantle liners wear. Design and application For the aggregates industry, Kubria ® crusher sizes 90, 110 and 130 are com- monly used. The number denotes the lower cone diameter. "G" models for coarse crushing and "F/M" models for fine and medium crushing applications are available for each size (see Fig. 3). The coarse "G" model crushers are equipped with a steeper cone, while crushers for fine and medium (F/M) crushing have a more flat cone. The steep cone angle results in achieving higher throughput rates. The use of the flatter cone angles in the F/M crushers means a particular- ly high-quality product can be achieved. The design of the bottom shells for either the "G" or "F/M" models is identical. The coarse crushers are used mainly in the second crushing stage. They can pro- cess feed sizes of up to 450 mm. The fine and medium crushers are used for second- ary and tertiary crushing. Here, feed sizes of up to 230 mm can be handled. All versions of the Kubria ® cone crush- ers are characterised by the fact that the material has a relatively long retention time in the crushing chamber, with a cor- respondingly high number of crushing steps. As a result, a product of high cu- bicity is produced, which is important for meeting product standards required for concrete aggregate and other products. The Kubria ® product name is based on the high cubicity product it produces. Fig.: 3 Kubria ® G type Kubria ® F/M type Application example One example of the use of Kubria ® cone crushers is in a three-stage crushing plant for the production of crushed stone. The flowsheet for this plant, which has a total capacity of 250 tph, can be seen in Fig. 4. Depending on the requirements of the producer, the plant can be designed as a stationary plant, a semi-mobile crushing plant, or a wheel-mounted portable plant in which the crushers and the associated screens are combined into modules. The 0–600 mm size run of mine mate- rial is discharged from a bin by means of a grizzly feeder where the initial primary screening takes place. Furthermore, a fine-screening stage is used to remove natural contaminants such as soil and dust, which are not wanted in the end product. In the first crushing stage, the material is crushed to 200 mm by an EB 11-08 jaw crusher. From there, it is conveyed to a secondary "G 90" cone crusher where it is crushed to a size of 50 mm in closed circuit with a screen. The product from the secondary crusher will already meet product standards, so the 25–50 mm fraction can be screened out and sent to product stockpiles for use as railway bal- last, drainage systems or other products. In the tertiary crushing stage, a Kubria® F/M 90 is used in a closed cir- cuit to produce the required end product. The product is then split into the various product size ranges by a circular vibrat- ing screen with 4 decks. By adjusting the close-side settings of the secondary and the tertiary crushers, it is possible to pro- duce a final product containing a particu- larly high portion of the desired fraction. Fig. 5 shows some typical product curves for a fine and medium crusher, with dif- ferent crusher settings. Fig. 4: Flowsheet for a three-stage crush- ing plant for the crushing of granite Thanks to the optimised crushing cham- ber geometry, the product of the tertia- ry crusher contains a high portion of the required fraction, which means that only approximately 5% of the feed volume has to be recirculated. This results in low- er wear of the crusher manganese and therefore higher availability for the crush- er and reduced operating expenses. Overall, the use of Kubria ® cone crush- ers allows the implementation of a plant concept that is characterised by efficien- cy, flexibility and a product that meets the highest quality requirements. With the use of modern control systems, a high degree of automation and user-friendli- ness can additionally be achieved. Fig. 5: Typical product gradation curves of Kubria ® cone crushers based on crusher setting A plant based on flowsheet shown in Fig. 4 was delivered to Cameroon earlier this year as a wheel-mounted portable plant system. All components were designed and manufactured by thyssenkrupp. The mobile modules, feed bins, surge bins and belt conveyors used were taken from the standard range of processing machines. Assembly and commissioning were also carried out by thyssenkrupp, which provided a turnkey plant that was handed over to the customer. Summary The new Kubria ® series of cone crushers from thyssenkrupp offers extremely com- petitive machines for coarse, medium and fine crushing to the aggregate indus- try. In operation for decades, these ma- chines have proved effective under the toughest conditions for crushing granite, basalt, gneiss and other hard rocks, as well as in the ore processing industry. Incorporating the latest technology, these machines provide: • High-cubicity finished product • Low wear and low operating expenses • Rapid crushing setting adjustment • Variable crushing chamber configurations for adaptation to product requirements • Ease of maintenance, with low mainte- nance downtimes • High level of operating reliability and process control with the Kubriamatic control system • Solutions for mobile, semi-mobile or sta- tionary plant requirements. For detailed information, please send us your inquiry to: P.T. Thyssenkrupp Industrial Solutions Indonesia Tempo Scan Tower, 20th Floor JI. HR. Rasuna Said Kav. 3-4 Jakarta 12950 Tel: +62-21-2939 2800 Fax: +62-21-2939 2804 Email: Website:

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