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The experimental investigations defined both the technological scheme of the   calcium production from limestone by aluminothermic process and the basic   operating parameters of the particular technological phases. The limestone   with high content of Mg, Na and K was used in the paper. X-ray analysis   reveals that the samples contain mainly calcite with small amount of   dolomite. At first, the influence of temperature, time and granulometry on   the calcium carbonate calcination was examined. The dissociation process was   completed in 10-15 min at 1200°C, and dissociation rate increases with   decreasing of particle size up to 5 mm. Afterwards, the aluminothermic   reduction process of calcium oxide was investigated. At the temperature   1200°C, and vacuum of at least 3 kPa, the reduction process completed within   2 hours. The chemical composition of calcium oxide and calcium showed   increased content of magnesium oxide and alkaline oxides (especially   sodium).[Projekat Ministartsva nauke Republike Srbije, br. TR34002 i br.   TR34023

The possibilities of obtaining metallic calcium from Serbian carbonate mineral raw materials