SU1408056A1 - Method of mining mineral deposits by underground leaching - Google Patents

Abstract

The invention relates to mining, namely, to the extraction of minerals by leaching at the place of their occurrence. The goal is to increase efficiency by increasing the extraction of the useful component, reducing the consumption of leaching reagent. In the implementation of the method, the ore formation is opened by vertical wells (C) 1. Casing is carried out, hydraulic shells are placed and C is sealed. An oxygen-containing gas is fed into the ore formation, simultaneously starting to wash out the cutting chamber; the underlying rocks on the border with the soil of the ore formation. The gas pressure in the chambers is maintained not less than the magnitude of the rock pressure at the level of the ore formation, due to which the gas works in the chamber, as a support and supports the overlying layers. The gas pressure is maintained constant in all chambers 5 that are eroded from one well to the complete oxidation of the underlying ore formation. After the useful component is oxidized in the top of the chopping chambers, before the leaching agent is supplied, the pressure of oxygen-containing gas in the slash chambers is periodically reduced and restored to complete collapse of the ore formation into the sweep chambers. A leaching solution is then supplied, the oxidized destroyed ore mass is leached, and a saturated solution is discharged to the surface for further processing. 1 za f-ly, 2 ill. B (L

Description

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The invention relates to mining, in particular to the mining of minerals by leaching at the place of their occurrence.

The purpose of the invention is to increase the efficiency by increasing the extraction of the useful component, reducing the consumption of higher recycled reagent.

FIG. 1 shows the process of oxidizing the ore formation with oxygen-containing gas; in fig. 2 - the process of dissolution of the oxidized useful component by leaching solution m.

The method is carried out as follows.

Drill a vertical well 1, lower the casing 2 to the soil of the ore formation 3, lower the hydraulic extraction tool 4 and seal the well. Starting to feed from the surface of oxygen-containing gas, at the same time beginning the erosion of the cutting chamber 5 in the underlying rocks at the border with the soil of the ore formation. The gas, filtering through the pores, begins to oxidize the weakly oxidized useful component of the ore formation, squeezing the formation water from the chamber being formed, creates the conditions for the operation of the jet of propellant in the dried bottom. The gas pressure in the chamber is maintained not less than the magnitude of the rock pressure in the surrounding rocks, due to which the gas in the chamber acts as a support and supports the overlying layers for the entire period of mining.

The shape, size and number of chambers are determined from the condition of closure of the boundaries of the gas filtration zones from adjacent chambers and depend on the physical properties of the rocks, the rate of ore oxidation, and the depth of the ore formation.

After the erosion is complete, oxygen-containing gas continues to be supplied to the chamber until the useful component is completely oxidized to the entire formation thickness in the part of the ore formation lying above the chamber. If there are two or more chambers, then at the end of a wash, one chamber of the hydropower shell is twisted by the required angle and the erosion of the next chamber begins.

Gas pressure is kept constant in all chambers eroded from one well until complete oxidation of the leach

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ore layer. After that, the hydrophobic projectile is removed and at the same time the gas pressure in the chambers abruptly drops, then the gas is again terminated, by restoring the pressure in the chambers to the same value. Thus, they periodically sharply raise and reduce the pressure before the oxidized ore formation collapses in the sub-chamber. Then a leaching solution is fed and the oxidized destroyed ore mass is leached and a saturated solution is discharged to the surface for further processing.

Claims (2)

1. A method of developing mineral deposits by underground leaching, including opening the ore formation with vertical wells, casing and sealing of wells, supplying oxygen-containing gas to the ore formation, oxidizing the useful component within the boundaries of the gas filtration zone through the formation, then feeding the leaching agent into the ore formation and producing productive solution to the surface, characterized in that, in order to increase the efficiency of the in-situ leaching by increasing the extraction of the useful component , reducing the leaching agent consumption, simultaneously with the supply of oxygen-containing gas in the sole of the ore formation, the substation chambers are hydraulically formed; the pressure of the oxygen-containing gas is maintained not less than the magnitude of rock pressure at the ore formation level in the undercut chambers, periodically reduce and restore to the complete collapse of the ore formation into the subcompact chambers. 2. A method according to Claim 1, characterized in that the shape, size and number of the pod-chambers formed in the base of the ore formation are set up to the closure of the boundaries of the filtration zones of oxygen-containing gas from the adjacent chambers. Licked reading solution Growth / Growth LJ   (. LJ i .Yc :) diggsch / - U - V you l HG (ISM h V //., 1 | (  fMvv iy P9 - 9V, JS) Y | 1 / 5MSH1 Y --Co U / with 2 F h V //., 1 | (  9V, V;