| 摘要 |
In accordance with the present invention, mineral values are recovered from subsurface earth formations containing the same as well as calcium-containing materials by injecting into at least one injection well an aqueous sulfuric acid leach solution adapted to extract such mineral values from the subsurface formation and containing a solubility increasing agent, such as sodium chloride, adapted to significantly increase the solubility of calcium sulfates in water, in an amount sufficient to thus increase the solubility of calcium sulfates in water, contacting the subsurface earth formation with the leach solution for a time sufficient to extract significant amounts of mineral values from the formation and produce a pregnant leach solution containing the thus extracted mineral values and to thus solubilized significant amounts of calcium sulfates and withdrawing the pregnant leach solution from at least one producing well.
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