Calcite control in an in situ leach operation

Details Calcite control in an in situ leach operation Calcite control in an in situ leach operation

1977-03-25

1978-08-01

Purser, Ernest R.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

166244C, E21B 4328

Patent

active

041039637

ABSTRACT:
A method of controlling calcite in an in situ leaching operation by retarding the growth of calcite crystals in the lixiviant only for the resident time that the lixiviant is in a critical area of the leach circuit and then allowing the calcite to precipitate from the lixiviant in a noncritical area. A chemical inhibitor, e.g., sodium hexametaphosphate, is added to the lixiviant as the lixiviant enters a critical area, e.g., from the bottom of a production well to surface processing equipment. The inhibitor is added to the lixiviant in an amount sufficient only to retard calcite precipitation while the lixiviant moves through a critical area but not to seriously impede calcite precipitation after the lixiviant exits the critical area.

REFERENCES:
patent: 3205013 (1965-09-01), Miller et al.
patent: 3792903 (1974-02-01), Rhoades
patent: 3891397 (1975-06-01), Fiedelman

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