Abstract
In this paper, the theoretical and industrial definitions of metallic calcium production by the metallothermic process in a vacuum atmosphere were investigated. In the experiments, Al is the only reductant used for metallothermic calcium production. The effects of Al stoichiometry, time variances, and temperature changes were investigated. The experiments were carried out at 1200 °C, 1250 °C, and 1300 °C, and with 100% Al, 125% Al, and 150% Al stoichiometry to produce metallic calcium from the residue of metallic magnesium production. Both the raw materials and the residue phases were characterized by atomic absorption spectrometry (AAS), X-ray diffraction (XRD) spectrometry, and chemical analysis techniques. Experimental results were investigated to determine the highest efficiency of reduction conditions. From the results of the experiments, reaction kinetics and activation energy were calculated. According to the experimental results, the highest recovery rate parameters for the reduction of calcium are 150% stoichiometric Al for 480 min at 1300 °C, with 72% recovery.
Highlights
Calcium is a shiny, silver-white metal and is quite ductile and soft
Raw materials as metallic and the time effect was investigated for calcium reduction at magnesium production residue and 100% stoichiometric Al powder mixture were prepared and magnesium production residue andthe
We wanted to recycle the Mg production residue to use it as a raw material for Ca production
Summary
Silver-white metal and is quite ductile and soft. Calcium metal oxidizes immediately in the air at temperatures above 300 ◦ C [1,2]. −304 kcal/mole O2 at 25 ◦ C, and the boiling point of the element and the melting point of calcium oxide are 1482 ◦ C and 2580 ◦ C, respectively [3]. Mineral Chemical Formula Ca% Calcite Gypsum Fluorite Portlandite Dolomite
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