SU1550113A1 - Method of leaching minerals from producing levels - Google Patents

Abstract

The invention relates to geotechnology and can be used in the leaching of minerals (PI) from productive horizons. The goal is to increase the leaching efficiency of PI from complex structural horizons by reducing the loss of the useful component and reducing the waste of the solution (p). The method of leaching PIs from production horizons involves opening the horizon with injection and pumping wells (C), which are equipped with filters within the productive horizon. Then, in the latter, highly permeable rocks and low permeable streaks are distinguished. The critical pressure gradient is determined at which suffusion begins in highly permeable rocks. The critical pressure gradient is also determined, at which suffusion begins in the rocks of low-permeable interlayers. Leach solution P is pumped through pumping C. Pumping of productive P is carried out from pumping C with the creation of a production pressure filtration gradient between pumping and pumping C. . At the same time support the ratio J _K1 * 98J _e * 98 J _K2 , where J _e - operational pressure gradient

J _K1 - critical pressure gradient at which suffusion begins in highly permeable rocks

J _K2 is a critical pressure gradient at which suffusion begins in the rocks of low permeable interlayers.

Description

The invention relates to geotechnology and can be used in the leaching of minerals from productive horizons, represented by rocks with different permeability.

The purpose of the invention is to increase the leaching efficiency of minerals from complex structural productive horizons by reducing the loss of the useful component and reducing the overhead of the solution.

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The essence of the invention is as follows. The flooded productive horizon, represented by gaps of well- and low-permeable rocks, for example sands and loams, is opened by a series of injection and retraction wells, which are equipped with filters within the productive horizon.

On the basis of conducting preliminary model and then full-scale experiments, pressure filtration gradients are determined for highly permeable rocks and for rocks of poorly permeable interlayers at which suffusion begins in these rocks. After determining these critical pressure gradients and refining them at the test site, the mineral leaching regime is adopted, based on the constant maintenance of the pressure filtration gradient when pumping and pumping a leaching solution, such as sulfuric acid, carbonates, etc., within the range of 1.1K where 1E is the selected operational pressure gradient filtration; ". the critical pressure gradient of filtration, at which suffusion begins in the well-permeable rocks of the productive horizon; 1kl critical pressure gradient filtration, at which suffers in rocks of low-permeable seams begins

productive horizon. i

When filtering mode is selected

in well-permeable rocks of the productive horizon, suffusional movement of small particles of the rock occurs with their clogging of the pores and pore channels of the well-permeable rocks, which eventually leads to a significant decrease in the permeability of these rocks; the leaching solution begins to be filtered by the said low-permeable interlayers, leaching the mineral from them, i.e. in the proposed method, the loss of the useful component is significantly reduced compared with the known methods due to the working out of low-permeable rocks rich in the useful component by the solution, and

-j Q 5

Q 5

five

five

3

This drastically reduces 1 solution overhead.

In the event that the presence of a useful component is observed in well-permeable rocks, first leaching is carried out in the usual mode with extraction of the useful component from well-permeable rocks, and then transferred to the mode of the proposed method, leaching the mineral from weakly permeable interlayers.

It is known that when leaching a mineral from a complex structural horizon, represented by sands and clay sands, with a difference in injection and pumping pressures of 10 kg / cm, the filtration rate of well-permeable rocks is 5 m / day. The filtration rate at which suffers in well-permeable rocks occurs is 6 m / day, and in less permeable 2 m / day. Based on this, the filtration rate is taken in well-permeable rocks of 7 m / day, and in less permeable rocks 1, m / day at a pressure of kg / cm2. In this case, in well-permeable rocks, the selected filtration rate will lead to suffusion, and in less permeable suffusion it will not be observed, i.e. well-permeable rocks will gradually clog, and most of the solution will be filtered by low-permeable streaks.

Claims (1)

Invention Formula I A method of leaching minerals from production horizons, including opening the horizon with injection and pumping wells, feeding the leach solution into injection wells and pumping productive oil from the pumping to create an operational pressure gradient filtration between these wells, characterized in complex structural horizons due to reduction of losses of the useful component and unproductive solution costs , are isolated in the production of Ho5 15501136 rizontah highly permeable rocks 1K. 19 1K, and low permeable interlayers, where I, - operational pressure, determine the critical pressure gradient; the vent at which the suf-g g starts is a critical pressure graph in high-permeable rocks, the dient in which the start- and critical pressure gradient is sufosi in the high permeability of which begins suffix-attributable rocks; rocks of low-permeable proplast-1 are critical pressure tracks, and the pressure gradient when feeding is done in which the nechin-leaching and pumping produce a sufozy in the rock solutions that are kept constant n-low-permeable by plastastic throughout the entire brick period. pitching pumping, while maintaining the ratio