Carlo Adamoli
Process for the extration of bases of rare elements contained in ores and rocks

Pagina 4

[Indice]

The conveniently pulverized ore, which is contained in the receptacle A is supplied to the pressure mixer C where it meets the salt solution which has been collected at B and which comes from the concentration apparatus N, with the precipitated fluoride coming from the decanter M and with the gaseous acid or the acid in solution coming from the Deacon converter or the like which is mounted at O. It is at C that the first reaction takes place, the duration, thermal conditions and pressure of this reaction varying according to the character of the ore and of the reagents which are used for this purpose, after which the paste is compressed and agglomerated in the form of briquettes D, while the liquid which has been expelled out of the said paste is lead to the precipitation and decantation apparatus M. The briquettes pass then to the furnace E where the reaction is achieved and then they are released, by crushing and lixiviation at F, from the solution of the rare compound to be extracted through the washing press at G, while the residue of the ore is discarded. The solution which contains the rare compound is introduced into the cathodic compartment of the electrolyzer I where this rare compound is separated by precipitation and by means of the centrifuge L it is extracted and collected in suitable vessels. The residual solution coming from the centrifuge is conveyed to M where it meets the liquid which has been expelled by D and the insoluble fluoride which is precipitated is returned into the cycle, while the decanted liquid is conveyed to the concentration apparatus N and from here to B.       On leaving the electrolyzer I the anodic product such as is present or after having been transformed at O is directly returned into the cycle at C.       The drawing has been labeled to illustrate the production of zirconium hydrate from a zirconium ore by the method of Example 1.       Examples of execution of the process will be now described, the said examples being non-limitative as regards the ore as well as the strong acid which is used.

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