In Australia, FLSmidth has received an order to deliver two of its Jaw Gyratory Crushers of model BK 63-75 to an underground mine in New South Wales. The recent order makes it the fifth and sixth Jaw Gyratory Crushers for this project, as it follows several already successful project deliveries of the same crusher type since 2010 for this customer.
FLS stated: “As with the previous orders, we deliver true performance to our partner: Each crusher can process up to 3,000 t of ROM gold ore per hour, while the unique feed opening design allows for the processing of even very large blocks, which often occur in the initial crushing phase.”
The Jaw Gyratory Crusher Pro is engineered to handle bigger chunks of material than comparable gyratory crushers of the same mantle diameter. “This gives you greater flexibility in your crushing operation, and reduces the tendency for bridging in the feed zone. Despite being capable of handling large feed materials, the Jaw Gyratory Crusher Pro still delivers a fine and uniform product thanks to its higher crushing ratio. The main characteristic of our jaw gyratory crushers is their enlarged feed opening, which is located on one side of the crusher only. It is normally serrated and, together with the upper part of the mantle, it forms the initial crushing zone. The coarsely crushed material is then reduced to the desired product size in the crushing chamber below.”
The optimised crushing chamber with huge feed opening also ensures high throughput rates; less tendency of bridging and a high crushing ratio. It allows for two crushing stages, a more fine and uniform product plus low operating and wear costs. It still combines all the advantages of a common gyratory crusher, including hydraulic adjustment of crushing gap to compensate for wear and a hydraulic main shaft adjustment for overload protection as well as a gyramatic monitoring and control system. It has direct drive via a disc-pack coupling with floating shaft and safety coupling, a cyclo-palloid spiral bevel gear for smooth operation and use of high-capacity drive motors; plus high starting torque allows the starting of the crusher under load in emergencies.
