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A Spanish company profits from recycling mountains of marble
A Spanish company profits from recycling mountains of marble
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Spanish marble breakthrough

As quarries worldwide grapple with the environmental burdens of excavated rock, a Spanish company has shown it is possible to recycle – and profit from - its mountains of marble. 
Marmetal – Mármores e Materiais de Construcao SA – belongs to the OPCA Group, and operates four quarries at Borba and Viana do Alentejo, located near the highway connecting Lisbon, Portugal and Madrid, Spain.
These quarries’ yearly production comprises 60,000 to 70,000 cubic metres, of which around 3000m3 are sold as blocks while 3000m2 to 4000m2 of marble claddings and slabs are manufactured and sold by Merrimac SA, an affiliated company.
“Today, environmental aspects are becoming more and more important to us, and new regulations issued by the European Union must be met. Therefore, as one of the first marble producers in Portugal to do so, we have decided to begin solving this waste marble challenge ourselves”, explains José AR Delgado, the managing director of Marmetal SA.

RECYCLED MARBLE APPLICATIONS
According to José Delgado, there are several applications for recycled marble, such as filler material for industrial use, cosmetics industry applications, fertiliser for agriculture, road layer works, concrete aggregate and landscaping material.
“Our objective is to create an environmentally friendly recycling process and make a profitable business out of it. We foresee a good market in the Extremadura region in Spain, where we will sell 30 to 40 per cent of the recycled materials. In addition, the new high speed train track between Madrid and Lisbon requires high quantities of the kinds of aggregates that we can produce from the waste marble,” José Delgado stresses.
In addition, tourism and the related construction projects are growing in the Alentejo region. The biggest inland lake in Portugal, Alqueva, is just 40km away, as is the famous historical city of Évora.

MODERN MOBILE CRUSHING AND SCREENING PROCESS
The crushing and screening process for marble is built around the modern, mobile Lokotrack LT1415S impactor plant, equipped with a detachable screen module and a ST620 mobile screen. Mobile equipment was chosen for easy movement between the quarries.
The waste marble is first hammered into a size of around 800mm, suitable for entering the NP1415 impact crusher’s cavity. Loading is performed with a Volvo EC360 excavator. On the Lokotrack LT1415S, a closed side setting of 60mm is being used.
The first screen deck of the LT1415S screen is set to 120mm, and the oversized material is returned to the impact crusher by the return conveyor. The 40-120mm product is separated with the side conveyor used in drainage projects.
Marble of 0-40mm in size is conveyed to the ST620 mobile screen. The end products are 0-4mm, 4-12mm, 12-20mm and 20-40mm, and sometimes 0-31.5mm for road base material.

CAPACITY UP TO 300 TPH
During its first months in operation, the mobile process has achieved an average capacity of around 200 tonnes per hour. When fine-tuned, José Delgado believes that a 300 tph capacity can be reached.
“During the initial months, we have processed over 150,000 tonnes of waste marble, and plan the annual production of over 300,000 tonnes. We are happy with the availability and capacity of the equipment, and achieve very nicely shaped end products with the impact crusher,” José Delgado comments.
“We are confident that, little by little, the existing waste marble mountain will disappear, thanks to the Lokotrack fleet.”

Source: Metso/Screenmasters Australia


















Wednesday, 18 July, 2018 10:59am
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