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

Pagina 8

[Indice]

This concentrated solution of sodium nitrate is treated with hydrochloric acid to form a solution containing sodium nitrate, sodium chloride and nitric acid in accordance with the following equation: 2NaN03 + Hcl = NaN03 + NaCl + HN03       The sodium chloride is separated from the solution by maintaining the solution at a temperature of about 70° C. The separation of the sodium chloride is caused by the diminution of its solubility in the presence of NO3 ions. The sodium chloride separated from this solution is utilized in the electrolyzer I for causing precipitation of beryllium hydrate. The chlorine given off in the electrolyzer Is converted into hydrochloric acid in an apparatus of the Deacon type according to the reaction 2H20+2Cl2=4HCl+0a. This hydrochloric acid is then used to treat another portion of the concentrated sodium nitrate solution produced in the concentrator N. The calcium fluoride which has been precipitated in the vessel M is returned to the pressure mixer C for treating further quantities of ore. The nitric acid and the sodium nitrate separated from the sodium chloride produced by the reaction of hydrochloric acid on the concentrated sodium nitrate solution are also returned to the pressure mixer C for treating further quantities of ore.       Thus the cycle of the operations is entirely closed, very simple and economical; through this operation about 72 to 73 kgs. of pure beryllium oxide will be obtained from the quantity of ore which has been used.

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