| 摘要 |
The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric gangue with sulphuric acid; (b) recovery of the metal value or values by a method which is known per se, (c) evaporation of the acid ferric solution resulting from stage (b) so as to increase the acidity to a value of between about 50 and 100%, (d) crystallization from this solution, at a temperature of between -10 and 50 DEG C., of a hydrated iron sulphate of formula Fe2(SO4)3.9H2O. Application to the recovery of strategic metals.
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