Mining with Drum Cutter (Simex Tf) Video
Waste material generated from the quarrying of decorative stone can represent a profitable quality product provided the equipment used is able to contain costs and deliver high productivity.
Apricena Stone is a calcareous sedimentary rock found within the confines of three municipalities situated on the plain below the Gargano (Apricena, Lesina and Poggio Imperiale). The area is a major mining hub in Southern Italy, but also has importance nationally, ranking among the prime centres for productivity and export.
Nearly all of Apricena Stone is stratified in 30-500 cm thick layers, usually separated by a layer of clay. Chemically speaking, the rock mass is over 96% calcium carbonate which presents traces of iron oxide, manganese and aluminium, as well as other minerals in lesser concentration. Apricena Stone is highly appreciated as an ornamental material for interiors and exteriors and is distinguished for its aesthetic features and durability, as well as its hardness and compression strength.
Use as an aggregate
Depending on the area and orientation, Apricena Stone sits in layers covered by overburden and weathered layers, which are considered waste. Once they are removed, they are transferred to special temporary storage areas. Though obviously unusable for decorative or architectural purposes, this material has excellent characteristics when crushed and is used as aggregate for embankments and fillers. But its reuse, also incentivized by regional government regulations, requires specific competencies and an in-depth knowledge of the work cycle, as well as the cost-to-benefit ratio.
Reusing material that cannot be quarried for the production of decorative stone depends on two important factors. The first is that the excavation to reach the layers involves the constant movement of machinery (which must have good mobility also in areas without tracks or access routes). The second is that the production of aggregates cannot be weighed down by excessive costs; in other words it has to guarantee material of the desired size range without performing additional processes to obtain it. The evaluation of both aspects eventually led Moteroc to abandon the use of the mobile crushing unit and to search for a solution that enabled greater flexibility in the applications and higher profitability. The solution was pinpointed in the Simex CBE crusher bucket and Simex TF2000 cutter head. As Giovanni Ortuso, company owner, remarked, 'The flexibility we get by using the excavator as the prime mover for various attachments definitely allows better mobility and operating flexibility'.
Both the crusher bucket and the cutter head allow us to obtain ideal size ranges for different applications, such as those required for the construction of a new section of the Gargano railway. According to the size range set out in the specifications, we use the aggregate produced in the quarry both for embankments and for the super-compacted layer placed under the sub-ballast. 'Commenting further, Ortuso said, 'Using the cutter head also allows us to profile the excavation face better than a breaker, because it enables a higher precision and significantly increases safety. 'The use of the cutter head is an efficient solution when the specs call for a size range of 0-30, ideal for mixing with the granular fill for foundations of various type. And in the specific case of the Gargano railway embankments, it matches the specifications for the super-compacted layer under the sub-ballast'.
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