Raj Stones, based in Fujairah, United Arab Emirates, says it has seen its aggregates production increase through the use of a CH660 cone crusher supplied by Sandvik Construction.
The company operates one of the larger quarries in the area and has reinforced its position as one of the premier aggregate suppliers in the region, now exporting material to Qatar as well supplying the growing UAE construction industry.
Raj, part of the Raj Group of companies, began operations in 2004, expanded with the acquisition of another quarry named Raj Rocks in 2008, and today possesses a hard-won reputation for quality and reliability.
The Raj Group itself is one of the leading companies in the Gulf Region, producing over 8 million tonnes/year of high quality gabbro aggregates as well as rock products for asphalt and ready-mix concrete plants.
This is accomplished due to the group now owning a vast range of mining and crushing equipment to work alongside its strong logistics division. This enables the group to carry out all its quarry operations independently and offer a full range of mining services to third parties. In order to ensure smooth operations, and imbue the group with independence, it also specialises in drilling and blasting, quarrying, trading and has a transport company, Raj Stones.
At the heart of the Raj Stones business are its two quarries: Raj Stones and Raj Rocks. With total estimated mineral deposits in the region of 265 million tonnes both quarries possess multi-stage, state-of-the-art crushing lines. Together, the quarries are capable of producing 1,000tonnes/hour of crushed aggregates and sands, which is used by the local construction industry, and increasingly for export.
In order to deal with increasing market requirements for high quality aggregate, a key piece of equipment used by the Raj Stones quarry is the Sandvik CH660, one of the Swedish company’s cone crushers that are of advanced design, possessing a high capacity in relation to size, high reduction efficiency and which produce excellent product shape.
With hydraulically adjusted CSS (closed side settings), optional automation, a choice of several different crushing chambers, and many other high performance features, each model is said to be versatile, user friendly and highly productive.
The use of the
The CH660 has proved to be ideal for Raj Stones’ secondary requirements because of the new design of the intake flow, which offers a compact and easy to service design. Such features as its automatic overload protection, and Sandvik’s automatic setting system, ASRi, have also played a key part in maximising production.
ASRi optimises cone crusher efficiency by automatically adapting the crusher to variations in feed conditions, and by continuously measuring and compensating for crusher liner wear, it allows the user to fully utilise crusher liners, thereby scheduling liner replacements in order to coincide with planned maintenance.
Sandvik says the ASRi also assists in keeping the crusher choke fed, thus maximising rock-on-rock crushing, which helps to optimise the quality of the final product.
A combination of constant liner performance (CLP) crushing chambers and high motor power is said to give the crushers very high capacity. However, the Sandvik CH660 design as used by Raj Stones has undergone an extensive upgrade designed to optimise operations at all levels, with these enhancements covering the entire crusher, including the feed hopper, top shell, bottom shell and main shaft/ head centre.
The top shell has been reinforced to meet the greater demands from quarrying and mining customers. Developed using the latest software, new design of the CH660 offers smoother curved corners to decrease stresses, while the spider cap diameter has been increased to protect the spider hub and the feed hopper is bolted with lock nuts, possessing a reinforced four-piece design producing increased stability. The bottom shell has a five-arm instead of a three-arm design.
