Method for selectively extracting magnesium chloride hexahydrate

Details Method for selectively extracting magnesium chloride hexahydrate Method for selectively extracting magnesium chloride hexahydrate

1975-05-23

1976-12-21

Novosad, Stephen J.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

299 5, E21C 3706, E21C 4106

Patent

active

039984923

ABSTRACT:
A method of separating and removing magnesium chloride hexahydrate from deep subterranean salt formations containing magnesium chloride hexahydrate, such as a carnallite bed or a bischofite bed, wherein one or more holes are drilled or provided through an overburden and into the bed. A solvent formed from any one of the lower saturated monohydric aliphatic alcohols having 1 to 4 carbon atoms, such as methanol, is directed downwardly in the hole and into contact with the bed, then upwardly through and out of the cased hole. Magnesium chloride hexahydrate is dissolved selectively by the solvent, but other salts, such as potassium chloride and sodium chloride, remain substantially insoluble in the solvent. The insolubles may be elevated out of the hole simultaneously with the lifting of the solvent-magnesium chloride hexahydrate solution or subsequent to such lifting. The flow is continued until the solvent is sufficiently lean to warrant the discontinuance of recovery of magnesium chloride hexahydrate, at which time the operation can be terminated or a second phase operation can be undertaken in which the slurry comprised of the solvent and the insolubles in the cavity of the bed is removed from the hole by conventional techniques, such as pumping or gas lifting.

REFERENCES:
patent: 2787455 (1957-04-01), Knappen
patent: 2847202 (1958-08-01), Pullen, Jr.
patent: 3442553 (1969-05-01), Kutz
patent: 3498674 (1970-03-01), Matthews
patent: 3833709 (1974-09-01), Chassagne

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