Scelta dei materiali
The lime production process has been known for thousands of years, in fact, the oldest discovery is a lime flooring found in Israel which dates back to 7000 b.C. The most remote examples of lime mixtures, dating back to the 7th and the 6th millennium b.C., were mainly found in the Middle East, places where researchers believe that the development of knowledge on binders took place. In Europe, the studies on the sacred temple of Monte D’Accoddi, located in northern Sardinia and dating back to the 3rd millennium b.C,, have demonstrated the use of raw lime mortars created by compacting calcite particles, obtained from "albino" neogenic limestone deposits, mixed with water (R. Vecchiattini 2009). Such discovery shows that lime has long been used in Sardinia, and this is confirmed by the numerous lime kilns, found in the island. The geological history of Sardinia and the consequent widespread presence of limestone allowed the development of a long tradition in lime production. Calcidrata undertook this activity in the early 20th century and became a leader of the sector over time. Calcidrata products are made with raw materials that are analysed in our laboratories where the best Sardinian limestones are selected, including those of the Orosei Marble District, a compacted coralligenous and bioclastic limestone, resulting from the deposition and stratification of shells, which allows us to obtain a top quality lime. The limes obtained through the controlled slaking of the oxide resulting from the calcination at about 900° C of the best Sardinian limestones are used in agriculture, by using the Agricalcium product to correct the soil pH, and with Calce Idrata (hydrated lime) and Fiore di Calce (hydrated lime powder), due to their high chemical-physical properties, excellence and purity, in water treatment, desulphurisation, disinfestation, soil stabilization, creation of eco-friendly floorings and neutralization of acid substances. Through the slaking of the same oxide obtained from the calcination of the best Sardinian limestones, the company produces a refined lime putty. The product undergoes a cyclonic separation process and is left to mature in tanks for years. These processes allow the development of a macrocrystalline structure, which gives cohesion, plasticity and thixotropy to the lime putty. For this reason, it is highly appreciated by restorers and used in the restoration of paintings with historic-artistic value. 3 Thanks to its high yield and covering power the product is ideal for preparing quality finishes and highly breathable paints. Over the years new products were added, such as the premixed lines consisting of plaster, masonry and screed mortars, glues and special mortars, during a continuous research and innovation to meet the market and customer needs.