Da: “Science News Letter” del 6 settembre 1941, pag. 150
Italian Process Makes Pure Magnesium From Common Ores
[ IL DOCUMENTO ORIGINALE ]
INVENTION - Magnesium, white metal important in defense and warfare, because of the lightness of its alloys, as well as its use in incendiary bombs, may be made easily from many common ores with a new process.
This is claimed in the specifications accompanying U. S. Patent 2,251,968, which has just been granted for the method to the inventor, Carlo Adamoli, of Milan, Italy. Rights on the American patent are assigned to the Perosa Corporation of Wilmington, Del.
Present methods of preparing the metal use clectrical means in separating it from its compounds, but these are not used in the Adamoli process. From common magnesium-containing ores, such as talc, magnesite, dolomite, etc., is obtained metal which, quoting the patent, "is free from any impurity having its origin either in the ores or in the reagents which have been used, the process being performed in the course of a single direct operation and avoiding the losses of metal which are ordinarily incurred when it is necessary to melt the metal because it is not compact enough."
The process is a cyclic one, in which the material goes through again and again. The ores are mixed with hydrofluoric acid to form magnesium fluoride, a reducing agent is mixed with them, and the magnesium metal goes ott in a vapor, to be condensed to the solid form. Then the hydrofluoric acid is regenerated and mixed with more ore.