SU1059145A1 - Method of producing counter-filtration curtains when conducting underground leaching of ore beds - Google Patents

Abstract

APS leaks of leaching solutions outside the leaching unit, the cavity of the filtration curtain is formed in the form of a dome supported by water The breeds, by self-leaching, leach the block logo to compensatory output, which is erupted in the underlying rocks of the ore formation by hydraulic spreading and is sloped along the soil from the periphery to the center, while compensating for the 5E roof area is critical.

Description

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4 Oi The invention relates to mining and can be used in the extraction of minerals by the method of nof seiviHoro leaching, mainly sandy-clay ores. There is a known method of creating impervious screenings, which includes drilling wells from the surface along the contour of the leaching unit, pumping hardening solutions into the wells under pressure, which spread around the wells, combining with the solutions of adjacent wells, and after hardening they form an impervious curtain 1. The disadvantage of this method is poor quality curtains, since natural anisotropy of rocks prevents the uniform spreading of solutions, as a result of which closure of hardening zones is not ensured, around wells, which leads to large leaks of leaching solutions through such windows. In addition, the spreading radius of the solutions does not exceed 1-2m, which requires drilling a large number of wells and increases the cost of underground gelation. The closest to the invention is the technical essence and the achieved result The method of creating an impervious curtain during underground leaching, including opening the ore-bearing formation with wells, forming the cavity of the filtration curtain and forcing it into it deyuschih solutions, wherein the cavity is formed, hydraulic curtain Kim discontinuity in the soil and the roof produk tive horizon 2. The disadvantage of the known method - low reliability filtration curtain that is associated with the impossibility of performing accurate fracturing in the chosen direction. In the process of hydraulic fracturing, the working fluid destroys the weakest bonds in the rock, and since all rocks possess natural anisotropy, the cavity of the hydraulic discharge is often the most direction of least resistance of the rocks. This leads to the fact that the boundaries of the filtration curtain accept arbitrary outlines and do not provide reliable hydro isolation of the ore block from the surrounding rocks, as a result of which large leaks of leaching solutions occur, which causes an increased consumption of the reagent and environmental pollution. The aim of the invention is to increase the efficiency of environmental protection by reducing leaks of leaching solutions outside the leaching unit. The goal is achieved by the method of creating impervious curtains during underground leaching of ore-bearing formations, including opening of the ore-bearing formation by wells, forming a cavity of the filtration curtain and forcing hardening solutions into it. the cavity of the filtration curtain is shaped in the form of a dome resting on waterproof rocks by self-crushing the leached block onto compensatory mining, which is formed in the underlying ore formation by hydraulic washing and extending from the periphery to the center along the soil slope from the periphery to the center, exposing the roof of the compensatory mining until critical. FIG. 1 shows the formation of a hydraulic fracture compensatory development; in fig. 2 - filling the cavity of the filtration curtain with hardening material; in fig. 3 — Leaching from a broken block of ore. The method is carried out as follows. The production horizon 1 is opened from the surface of the field by a borehole 2, erosion, drilling of which is carried out below the soil of the production horizon 1. The borehole 2 is eroded to the soil of the production horizon 1 and cased with casing pipe 3, into which the hydraulic extraction equipment is placed in plan x 5 to waterproof rocks 6. with a slope on the soil from the periphery to the center of the well 2. The scouring is carried out until the exposed area of the roof reaches the critical area, in The result is the collapse of part of productive Horizon 1 into the developed space of compensatory generation 5. The process of collapse of productive horizon 1 into the developed space 5 continues until a vault 7 forms, a natural equilibrium having the shape of a dome resting on waterproof impermeable rocks b . The collapsed part of the productive horizon 1 forms a loosened ore 8 in an attached block, which, as a result of loosening, has an increased permeability. . Depending on the strength characteristics of the productive horizon 1, the critical value of the exposed area of the round roof in terms of production is determined by the known formulas. After termination of the collapse of a part of productive horizon 1, injection wells 9 are drilled from the surface of the field into the developed space until the intersection of the natural and equal Vyoksa 7 with the domed surface of the arch of the natural 7, between which and the loosened ore 8 of the leached block remains a cavity of the filtration curtain 10, the repeated vault of the curved 7 natural balance. Through the injection wells 9, a hardening solution is fed into the dome-shaped cavity of the filtration curtain 10, which fills the cavity of the filtration curtain 10.and, along the periphery of the compensation production 5, with the underlying rocks b, isolates the crushed leached ore 8 leached. block from the surrounding rocks of the productive horizon 1. At the same time, the downhole part of the well 2 erosion is equipped with filter 11. After the insulating mortar is hardened, the downhole part 12 of the injection wells 9 is drilled to the top of the loosened ore 8 of the leached unit. Then, a leaching solution of the reagent is supplied to the wells 9, which is filtered through the expanded ore of the leached block 8, enriched with the useful component and, falling on the inclined bottom of the compressive excavation 5, flows by gravity to the filter 11, then through the well 2 erosion is released to the surface. Filtration of the reagent solution occurs only through the loosened ore 8, since the cavity of the filtration curtain 10 filled with hardening material reliably isolates the highly permeable ore 8. From the rest of production horizon 1. In addition, the cavity of the filtration curtain 10 filled with hardening mortar rests on the bottom the sloping bottom of the waterproof bedrock 6, then 1u, the whole enriched reagent solution, collected on the basis of the compensatory generation of the 5 blocking block, is indispensable by gravity It enters the filter 11. The dome-shaped cavity of the filtration curtain 10 can be clearly controlled from the surface, since the body 7 of natural equilibrium is formed according to a parabolic law and its dimensions are known. This makes it possible to calculate with the necessary so-called volume of the loosened 8 and the amount of the reagent solution. In psychosis, the hardening solution fills only free space through the wells 9, which ensures even distribution of solid solution through the domed cavity of the filtration curtain and eliminates the formation of windows through which communication of the loose ore 8 productive unit with the horizon 1 can be realized. Application of the proposed the invention provides improved access of the reagent solution to the useful component, increasing the efficiency of the process of underground inking and protecting the environment environment and involving. development of ore bodies occurring in complex mining and geological conditions.

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Claims (1)

METHOD FOR CREATING AN ANTI-FILTRATION CURTAIN FOR UNDERGROUND CREATION OF ORE-GROWING OILS Bounded by watertight rocks in the soil, including opening the ore-bearing stratum with boreholes, forming a filter-curtain cavity and injecting hardening solutions into it, which is more environmentally friendly, which is aimed at increasing the environmental protection to reduce leakage of leach solutions beyond the leach block, the cavity of the filter curtain is formed in the form of a dome resting on waterproof delivery by caving leachable unit for compensating production, which is formed in the underlying layer of ore rocks gidrora'z№yvom and tested with a gradient of soil _of from the periphery to the center, the area S of the roof exposure compensation was adjusted to produce critical. SU, „, 10591 four* C / 1>