Method and apparatus for mixing gaseous oxidant and lixiviant in

Details Method and apparatus for mixing gaseous oxidant and lixiviant in Method and apparatus for mixing gaseous oxidant and lixiviant in

1977-10-31

1982-09-28

Pate, III, William F.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Dissolving or chemical reaction

261 74, E21B 4328

Patent

active

043515665

ABSTRACT:
Method and apparatus for mixing a gaseous oxidant (e.g., oxygen) and a lixiviant (e.g., an aqueous carbonate solution) at a downhole location in a well before the oxygen-saturated lixiviant is injected into a formation to be leached. The invention involves establishing a mixing zone in the well by positioning an orifice plate in the well at the downhole location. Lixiviant as it is flowed down the well passes through a restrictive opening in the plate causing a substantial increase in the flow velocity of the lixiviant. At the same time, gaseous oxidant is supplied to a point adjacent the opening in the plate and due to the increased velocity of the lixiviant flowing through the orifice, the oxidant is trapped to form a gas pocket below the orifice. Lixiviant flows through the gas pocket and becomes saturated with the gaseous oxidant.

REFERENCES:
patent: 3640579 (1972-02-01), Lewis
patent: 3928199 (1975-12-01), Kirk
patent: 4045084 (1977-08-01), Hsueh et al.
patent: 4066297 (1978-01-01), Spence

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