Mining equipment and services provider Sandvik demonstrated its expertise as a supplier to the aggregates and construction industries at the tenth Steinexpo demonstration exhibition, in Germany, exhibiting products for various applications in the raw materials industry.

Steinexpo, held from August 30 to September 2, is well known for recreating a real-life working environment. Held at the Mitteldeutsche Hartstein Industrie’s quarry, in Nieder-Ofleiden, Hessen, the show draws in an ever-increasing number of visitors each year to experience exhibits in a working environment, and Sandvik’s presentation aimed to implement this objective, says the company.

The latest addition to the CH/S 500 series from Sandvik, the CS550 cone crusher is designed as a powerful secondary crusher for applications in the aggregates industry requiring a capacity of 250 t/h to 750 t/h. Apart from its flexibility and concentrated crushing power, this model provides maximum operational productivity and availability, thanks to its modern automation functions and its user-friendly maintenance design, owing to the complete absence of casting compound during installation of the crushing tools.

In addition, ergonomic improvements ensure that maintenance and servicing of the plant are safer and faster.

The Sandvik CS550 achieves a 25% higher crushing ratio, which, along with its “high throughput rate and excellent grain quality”, is the result of the crushing chamber geometry, which was developed in-house. The CS550 sustainably relieves the load on the tertiary stage, explains Sandvik, pointing out that, as a result, the material cycle load of the process stage can be reduced by up to 50%.

The Sandvik CS550 offers a range of achievable gap widths and adjustable crushing strokes to allow a large feed opening, adapted to the primary-stage jaw crusher. This extreme flexibility makes the Sandvik CS550 ideal for various requirements, says the company.

The crusher also includes the modern crusher controller, also developed in-house by Sandvik, and recently introduced by the company as a standard feature on the Sandvik 500 series of crushers. It improves the efficiency of operation, adapts the crusher to different operating conditions and also makes provision for remote monitoring. Protection against overload is guaranteed by the so-called hydroset system; it automatically regulates the position of the main shaft and allows nonbreakable material to pass as required.

Wear Protection and Screen Media

Also featured at Steinexpo was the newly developed Sandvik screen media product, the Sandvik WX6500, which was presented to the professional public for the first time. It combines the screening accuracy of a wire mesh for split cuts of 2 mm to 32 mm particle size with all the advantages of a rubber screen panel. In addition to durability up to ten times greater than that of conventional wire mesh, users will appreciate the particularly simple handling of the light and flexible screen media, says Sandvik.

“In practice, the maximum proportion of the open screen area, the outstanding screening accuracy and excellent screening performance convincingly meet the particularly high demands that practitioners place on the quality of the finished product. In this respect, the Sandvik WX6500 screen medium is absolutely equal to wire mesh, but it provides other positive properties that wire screens do not. The new-type screen panel reduces clogging and material sticking to the screen,” the company explains.

The wear-resistant screen panel ensures that the quality of the product generated is consistent over the entire operating time. This increases the reliability of the production process and also brings about a significant reduction in replacement intervals and production downtimes because of the long service life of the screen panel. The intervals between screen inspections are significantly longer.

Moreover, replacement is much quicker and – owing to the flexibility of the screen media – much less complicated, compared with wire screen panels. “All in all, switching to products such as the Sandvik WX6500 saves valuable production time,” states Sandvik.

Mobile Crushing and Screening

The new QJ341+ tracked jaw crusher was also on display at the Sandvik stand. This new crusher model features a double-deck prescreen as a standard feature and so expands the performance of this Sandvik bestseller under mobile jaw crushers with the QJ341-type designation, says the company.

The intensive and, therefore, particularly thorough prescreening of large quantities of fine particles makes the QJ341+ especially ideal for quarrying applications with a high fines content, compared with the standard model. Test results confirm an increase in productivity of up to 38% in certain applications. In addition, the effective removal of fine par- ticles reduces the wear in the crushing chamber before the actual crushing takes place.

To complement the prescreen, the QJ341+ features a new telescopic natural fines conveyor, with a discharge height of 3.1 m to deal with the increased flow of prescreened material. The dirt chute is designed with a steeper angle to enable a faster transfer of material, while also increasing the ability to deal with sticky material. The dirt chute has three positions and allows all material passing the prescreen grizzly to be diverted to either the main conveyor or the natural fines conveyor. The middle position allows screened product to be transferred to the fines conveyor. All of this is done by positioning the three-way chute without removing any media from the prescreen.

Like the standard model, the QJ341+ also has easy-to-use features, such as a hydraulic gap adjustment, a reversible jaw and a hydraulic drive for starting when under load, as well as a Sandvik programmable logic controller with a control screen. Highly efficient inclined axle and radial piston motors reduce the hydraulic flow rates, decrease fuel consumption and improve the durability of the 50 t plant with throughputs of up to 400 t/h.