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Limestone preparation and refining
Stone preparation comprises primary and secondary crushing. Screening ensures grading of the product into its respective grain sizes. If required, stone washing uses recycled water that is usually obtained from settling ponds.
Following the crushing process, intermediate stone stockpiling guarantees a steady supply of stone to the downstream processes. Quarries operate by day during the week, while transformation installations generally work around the clock.
Stone fractions bigger than 20 mm are usually sent to calcining kilns. Stone not destined for industrial calcination is generally further refined for other applications. In these refining processes, it is either ground or dried and milled to attain the specifications required for a whole range of markets, as aggregates or milled products.