Patented July 29, 1941 2,250.851
UNITED STATES PATENT OFFICE
2,250,851
PROCESS FOR THE EXTRACTION OF BASES
OF RARE ELEMENTS CONTAINED IN ORES AND ROCKS
Carlo Adamoli, Milan, Italy, assignor to Perosa
Corporation, Wilmington, Del., a corporation of Delaware
Application November 8,1938, Serial No. 239,595
In Italy November 24, 1937
7 Claims. (Cl. 23-19)
It is highly desirable, in many cases of extraction on a commercial scale of precious chemical products which are found in nature In the form of complex silicates, of silico-aluminates and the like, but in comparatively small contents, in the middle of the original mineral masses, to be able to conduct the extraction so as to attack, by the chemico-physical treatments which are used, only the chemical element or compound which it is desirable to extract without consuming energy or reagents for the silica masses or silica and alumina masses or the like which contain the precious element to be extracted. The advantage of such an extraction is still greater when the extraction is to be effected not from characteristic ores, but from rocks which contain these ores and for which the cost of treatment would increase, the smaller the quantity of element to be extracted which is contained therein. Many chemical elements, the so-called rare elements, are found in conditions which are such that they can be opportunely extracted by the application of the above disclosed technical criteria.
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