Metso's Double Deck Conveying Solution

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Posted in: , on 26. Sep. 2003 - 20:57


The Carrieres de la Loire quarry in France has recently installed a new turnkey Metso Minerals crushing and screening facility featuring a total of 1.3 km of conveyors; the new conveying equipment includes two new space saving double deck conveyors.

Located approximately 20km north of St Etienne, the Carrieres de la Loire quarry is one of the largest privately owned facilities in France. The quarry has recently upgraded the majority of its production equipment, with Metso Minerals installing new secondary and tertiary crushing and screening equipment, two Nordberg swivelling stackers and 1.3 km of conveyors.

The entire crushing and screening plant from Metso Minerals – which includes a Nordberg HP500, one HP300 and two HP200 crushers - has been housed within a purpose-built sound and dust encapsulated building.

From this building, product from the secondary crushing stage is either conveyed to tertiary stage screens, or if oversized, back to the crushing stage.

Two separate Nordberg NB-series double-decked conveyors supply product in and out from the secondary crushing stage. The advantage of the two double-decked conveyors is the fact that they are both supported on the same superstructure, saving valuable space at this compact site.

According to Carlos Padin, product support engineer for Metso Minerals, ordinarily this site would have installed four separate conveyors, which would have taken up a lot of valuable space. “We installed the double-decked units to ensure the quarry maximised its production and the available space with one-single structure supporting two double-deck conveyors,” he says. The two double-deck Nordberg units have conveyor widths of 1.2 m, a standard width for Metso Minerals.

One double deck transports conveyors with lengths of 57 m and 77 m, while the other deck carries 43 m-long and 70 m-long conveyors. As well as the two double-deck conveyors, the Quarry has also a further 22 Nordberg conveyors with lengths from 14 m to 104 m, and six Nordberg TBC series compact conveyors, giving the facility a total of 1.3 km of Metso Minerals conveying.

All installed conveyors from Metso Minerals at Carrieres de la Loire have been dust encapsulated - for full environmental protection - with the aid of a canvass cover system. The canvass covers have excellent sealing qualities against dust pollution and are also flexible and tough.

The six Nordberg TBC compact conveyors are all equipped with Nordberg EBC extractors, and are specifically designed for inclusion on compact static plants such as Carrieres de la Loire.

Full turnkey project

Metso Minerals has supplied a complete solution for the Carrieres de la Loire quarry. Maintaining its original primary crushing equipment, Metso installed and supplied a completely new secondary and tertiary crushing and screening plant, along with all subsidiary equipment. The equipment includes one Nordberg HP500 cone crusher with a 500-tph capacity, a Nordberg HP300 crusher – both working as secondary stage units – and two Nordberg HP200 crushers operating as a tertiary stage machines.

Metso Minerals has also supplied five screens - three triple deck units and two double deck screens, along with two Nordberg swivelling stackers used for stockpiling duties.

The Quarry supplies aggregates to the French road construction industry, with six product sizes being produced, 0/2 mm, 2/4 mm, 4/6 mm, 6/10 mm, 10/14 mm and 14/20 mm. The facility also produces ballast for rail construction, and when this product of 0/20 mm is being crushed, only the five smallest aggregate products are produced, with the 25/50 mm line being automatically switched to ballast production.

The Carrieres de la Loire facility has a history dating back to the early 20th Century. The company has come along way since then, with the new Metso Minerals plant increasing production and product quality.

Covering an area of approximately 60 ha, the facility estimates that its quarrying reserves will last for another 60 years.

For further information please contact Mr. Jan Olofsson at:



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Posted on 1. Oct. 2003 - 08:25

Dear Mr. Olofsson,

We also do have two nos. of double deck belt conveyors housed in single structure in our port totalling ~ 1.45 kms.

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