PROCESS OF UNDERGROUND DISSOLUTION OF SALT DEPOSITS Russian patent published in 2004 - IPC

FIELD: mining industry, production of mineral salt by underground dissolution through boreholes. SUBSTANCE: process includes driving of borehole into salt deposit, casing of borehole, fitting with tubes placed concentrically, supply of solvent and non-solvent over tubes, erosion of preparatory horizontal cut and vertical working, washing-out of chamber by water feed. Solvent is saturated with carbon dioxide on ground in advance with mass proportion of carbon dioxide to solvent from 0.02:1 to 0.16:1 and nonsolvent is mixed with absorbent of carbon dioxide with mass proportion of absorbent to carbon dioxide from 1.1: 1 to 1.5: 1 and is periodically delivered into chamber. Density of absorbent is less than density of nonsolvent. Hopcalite of class E is utilized in the capacity of absorbent. EFFECT: increased output of salt by rise of velocity of upward current of solvent. 1 cl, 1 dwg, 1 tbl