In-situ leaching uranium mining method

Abstract

The invention discloses an in-situ leaching uranium mining method, which belongs to the technical field of in-situ leaching uranium mining, and comprises the following steps: acquiring logging data corresponding to a to-be-mined area; dividing a plurality of ore-bearing beds at preset intervals in the depth direction of the to-be-mined area, counting the total thickness of the ore-bearing section of each process drill hole in the corresponding sandstone layer by layer, grouping according to injection-production units, and calculating the average ore-bearing thickness of all the process drill holes in each injection-production unit in each layer layer by layer; taking the injection-production units as elements, constructing an ore-bearing matrix of each ore-bearing bed according to the spatial distribution of the injection-production units in the to-be-mined area, and filling the ore-bearing matrix with the average ore-bearing thickness of each injection-production unit in the corresponding ore-bearing bed according to a position sequence; based on the horizon correlation analysis of the ore-bearing matrix, a layered mining horizon is determined, and the layered mining horizon comprises a plurality of development horizons; calculating the design length of the filter and the lowering depth of the upper interface of the filter according to the layer number of the ore-bearing layer at the overlapping position of the ore-bearing area in each development layer; and sequentially exploiting from deep to shallow according to the depth of the development horizon.

Description

Technical Field

[0001] The present application belongs to the technical field of in-situ leaching of uranium, and specifically relates to a method for in-situ leaching of uranium. Background Art

[0002] As an efficient and environmentally friendly uranium mining technology, in-situ uranium leaching has become a mainstream technology in the uranium mining sector, thanks to its advantages such as minimal surface disturbance, high resource recovery rate, and relatively low production costs. Its core principle is to inject a leaching agent into the ore-bearing formation, causing uranium to dissolve from the ore and migrate with the solution. The uranium-containing solution is then pumped to the surface through a drilling hole for extraction, achieving in-situ mining of uranium resources.

[0003] However, in practice, the effectiveness of in-situ uranium leaching is significantly affected by the geological conditions of the ore-bearing strata. Many ore-bearing strata in prospective mining areas are multi-layered and heterogeneous. Vertically, ore-bearing strata often overlap along the depth axis, with significant differences in lithology, ore-bearing stratigraphic characteristics, uranium grades, and uranium content per square meter. Horizontally, the same ore-bearing stratum can develop unevenly in different areas, resulting in spatial heterogeneity in mineralization enrichment.

[0004] These complex geological conditions present significant challenges to in-situ uranium leaching. If a monolithic mining method is employed, where a long filter is installed underground, the overly long filter dilutes the leaching solution during its flow, making it difficult to achieve uniform distribution within the ore layer. This reduces leaching efficiency, increases production costs, and increases the risk of environmental pollution. However, when using a simple layered mining method, the spatial correlation and characteristic differences between the ore bodies in each layer are not fully considered. This can lead to uneven leaching during the leaching process, causing a preferential flow problem and causing the leaching solution to rapidly drain along highly permeable channels. This prevents the uranium ore in low-permeability ore-bearing areas from being fully leached. This not only reduces resource recovery but can also waste leaching solution and cause cross-layer contamination. Summary of the Invention

[0005] In view of this, the present application provides a method for in-situ leaching of uranium, the main purpose of which is to improve the contact efficiency between the leachate and the target mineral-bearing layer, reduce the cross-flow and waste of the leachate, reduce the impact of the dominant flow, improve the recovery rate and mining efficiency of uranium resources, and at the same time reduce the risk of environmental pollution, and ultimately achieve efficient, safe and economical mining of multi-layered, heterogeneous mineral-bearing strata.

[0006] To achieve the above objectives, this application mainly provides the following technical solutions:

[0007] The present application provides a method for in-situ leaching of uranium, comprising:

[0008] Acquire well logging data corresponding to the area to be mined, wherein the well logging data includes at least lithologic distribution, characteristics of ore-bearing strata, uranium grade, and uranium content per square meter;

[0009] Divide the depth of the area to be mined into multiple layers of ore-bearing layers at preset intervals, calculate the total thickness of the ore-bearing sections of each process drill hole in the corresponding sandstone layer by layer, then group them by injection and mining units, and calculate the average ore-bearing thickness of each layer of all the process drill holes in each injection and mining unit layer by layer;

[0010] Taking the injection and mining units as elements, constructing an ore-bearing matrix for each ore-bearing layer according to the spatial distribution of the injection and mining units in the to-be-mined area, and filling the ore-bearing matrix with the average ore-bearing thickness of each injection and mining unit corresponding to the ore-bearing layer in positional order;

[0011] Determining a stratum mining horizon based on a horizon correlation analysis of the ore-bearing matrix, wherein the stratum mining horizon includes a plurality of development horizons;

[0012] Calculating the design length of the filter and the lowering depth of the upper interface of the filter according to the number of the mineral-bearing layers at the overlapping locations of the mineral-bearing areas in each of the development horizons;

[0013] Mining is carried out in sequence from deep to shallow according to the depth of the development layer.

[0014] Optionally, the determining of the stratum mining strata based on the stratum correlation analysis of the ore-bearing matrix includes:

[0015] Identification of dominant mineral layers;

[0016] Layer merging;

[0017] Development boundaries are determined.

[0018] Optionally, the identification of the dominant ore layer includes:

[0019] Assigning a value of 1 to the elements in each of the mineralization matrices whose average mineralization thickness is not less than a preset thickness, and assigning a value of 0 to the remaining elements;

[0020] Calculate the percentage of the number of elements with a median value of 1 in each of the mineral-bearing matrices to the total number of elements;

[0021] The ore-bearing layer corresponding to the ore-bearing matrix with the highest percentage is selected as the dominant ore layer.

[0022] Optionally, the merging of horizons includes:

[0023] In the case where there are ore-bearing layers on both sides of the dominant ore layer in the depth direction, respectively calculating the overlap between the dominant ore layer and the ore-bearing regions of the adjacent ore-bearing layers on both sides;

[0024] If the difference in the degree of overlap between the dominant ore layer and the ore-bearing areas of the adjacent ore-bearing layers on both sides is not less than 2%, the adjacent ore-bearing layers on the side with a higher degree of overlap between the dominant ore layer and the ore-bearing areas are merged into one development horizon;

[0025] If the difference in overlap between the dominant ore layer and the ore-bearing areas of the adjacent ore-bearing layers on both sides is less than 2%, combined with the principle of similar lithology and the decision of interlayer mudstone thickness, the dominant ore layer and the adjacent ore-bearing layer on the side with more similar lithology and interlayer mudstone thickness less than 1.5 meters will be merged into one development layer.

[0026] Optionally, the merging of horizons includes:

[0027] In the case where only one of the two sides of the dominant mineral layer in the depth direction has the mineral-bearing layer, the overlap between the dominant mineral layer and the mineral-bearing region of the adjacent mineral-bearing layer, and the overlap between the mineral-bearing region of the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer are calculated;

[0028] If the degree of overlap between the dominant ore layer and the adjacent ore-bearing layer is greater than the degree of overlap between the adjacent ore-bearing layer and the ore-bearing layer on the side away from the dominant ore layer, the dominant ore layer and the adjacent ore-bearing layer are merged into one development horizon;

[0029] If the degree of overlap between the dominant mineral layer and the mineral-bearing area of ​​the adjacent mineral-bearing layer is less than the degree of overlap between the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer, the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer are merged into one development layer, and the dominant mineral layer is separately used as another development layer.

[0030] Optionally, the merging of horizons further includes:

[0031] After completing the stratum merging of the dominant ore layers, if the number of the remaining unmerged ore-bearing layers is not less than three, identifying sub-dominant ore layers from the remaining unmerged ore-bearing layers, and merging the sub-dominant ore layers according to the stratum merging rules of the dominant ore layers;

[0032] If, after the horizons of the sub-dominant ore layer are merged, the number of the remaining unmerged ore-bearing layers is still not less than three, the steps of identifying the sub-dominant ore layer from the remaining unmerged ore-bearing layers and merging the sub-dominant ore layer according to the horizon merging rule of the dominant ore layer are repeated until the number of the remaining unmerged ore-bearing layers is less than three;

[0033] Wherein, when the mineral-bearing layer merged with the sub-dominant mineral layer is located within the determined development horizon:

[0034] If there is no other ore-bearing layer on the other side of the sub-dominant ore layer, merge the sub-dominant ore layer into the determined development layer;

[0035] If there is another mineral-bearing layer on the other side of the sub-dominant mineral layer, the sub-dominant mineral layer and the mineral-bearing layer on the other side are merged into one development layer.

[0036] Optionally, the merging of horizons further includes:

[0037] After completing the merging of the dominant ore layers, if there are two ore-bearing layers remaining that have not been merged:

[0038] If the two mineral-bearing layers are adjacent to each other, the two mineral-bearing layers are merged into one development layer;

[0039] If the two mineral-bearing layers are dispersed, each mineral-bearing layer shall be merged with its spatially adjacent and determined development layer, and ensure that the difference in the number of mineral-bearing layers of the adjacent development layers after the merger does not exceed two layers.

[0040] Optionally, the merging of horizons further includes:

[0041] After completing the merging of the dominant mineral layers, if the number of the remaining unmerged mineral-bearing layers is only one, the mineral-bearing layer shall be merged with the spatially adjacent and determined development layer, and ensure that the difference in the number of mineral-bearing layers of the adjacent development layers after the merger does not exceed two layers.

[0042] Optionally, when the same development layer is developed using filters of the same length:

[0043] The design length of the filter complies with the formula:

[0044] L=Num1*A*σ

[0045] Wherein, L is the design length of the filter, Num1 is the upper limit of the number of ore-bearing layers at the overlapping ore-bearing areas in the development horizon, σ is an empirical coefficient, ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters;

[0046] The lowering depth of the upper interface of the filter complies with the formula:

[0047] H=H1-Num1*A / 2-L / 2

[0048] In the formula, H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num1 is the upper limit of the number of mineral-bearing layers at the overlapping of mineral-bearing areas in the development horizon, A is the interval value of the mineral-bearing layers, ranging from 5 to 10 meters, and L is the design length of the filter.

[0049] Optionally, when the same development layer is developed using filters of different lengths:

[0050] The design length of the filter complies with the formula:

[0051] L=Num2*A*σ

[0052] Wherein, L is the design length of the filter, Num2 is the number of the ore-bearing layers at the overlapping ore-bearing areas of each injection-production unit in the corresponding development horizon, σ is an empirical coefficient, ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters;

[0053] Among them, for the process drill hole that is not located at the position where the number of overlapping layers of the mineral-bearing layer in the development layer changes, the corresponding lowering depth of the upper interface of the filter meets the formula:

[0054] H=H1-Num2*A / 2-L / 2

[0055] Wherein, H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num2 is the number of layers of the ore-bearing layer at the overlapping ore-bearing area of ​​each injection-production unit in the corresponding development horizon, A is the interval value of the ore-bearing layer, ranging from 5 to 10 meters, and L is the design length of the filter;

[0056] Among them, for the process drill hole located at the position where the number of overlapping layers of the mineral-bearing layer changes in the development layer, the corresponding lowering depth of the upper interface of the filter meets the formula:

[0057] H=H1-L*(1+σ) / 2σ

[0058] Where H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development layer, L is the design length of the filter, and σ is an empirical coefficient with a value range of 0.5 to 1.

[0059] By means of the above technical solution, this application has at least the following beneficial effects:

[0060] The in-situ leaching uranium mining method provided in the embodiments of the present application is based on well logging data, divides multiple layers of mineralized layers at preset depth intervals, and constructs an mineralized matrix in combination with the spatial distribution of injection and mining units. It can associate the average mineralized thickness with the spatial position, and intuitively quantify the development differences of mineralized layers at different depths and in different areas, solving the problem of vague description of multi-layer heterogeneity characteristics and difficulty in accurately locating the target mineral layer in traditional mining.

[0061] In the in-situ uranium leaching method provided in the embodiments of the present application, the stratum correlation analysis uses matrix data to mine the overlap, continuity and other relationships between mineral-bearing layers, which can provide a data-based and visual decision-making basis for the subsequent division of strata for stratified mining, avoiding the subjectivity and blindness of manual stratification.

[0062] The in-situ uranium leaching method provided in the embodiments of the present application calculates filter parameters based on the number of mineral-bearing layers at the overlapping mineral-bearing areas in the development horizon, so that the filter accurately covers the overlapping mineral-bearing areas of the target development horizon, avoids the ineffective coverage of non-mineral layers by traditional long filters, and reduces the dilution and waste of the leaching agent in the non-mineral layers.

[0063] In the in-situ uranium leaching method provided in the embodiments of the present application, the filter parameters are dynamically adapted to the ore layer structure, which can ensure that the leaching agent acts concentratedly on the high-ore-containing area, improve the contact efficiency between the leaching agent and the ore, and solve the problem of uneven leaching agent distribution in traditional layered mining.

[0064] The in-situ uranium leaching method provided in the embodiments of the present application adopts a layered mining sequence from deep to shallow, which can avoid the disturbance of the upper layer mining on the lower unmined ore layer, reduce the cross-flow of the leachate to the mined area due to gravity, and block the formation path of the dominant flow from the process perspective.

[0065] The in-situ uranium leaching method provided in the embodiments of the present application is aimed at the independent mining of each development layer, combined with the design of a precision filter, which can make the leaching agent penetrate evenly in the target development layer, improve the uranium leaching rate, and thus improve the resource recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A flow chart of an in-situ leaching method for uranium mining according to an optional embodiment of the present application;

[0067] Figure 2 A diagram showing the mineral content of each mineral-bearing layer in an optional embodiment of the present application;

[0068] Figure 3 This is a longitudinal cross-sectional view of the mineral content of each mineral-bearing layer in an optional embodiment of the present application. DETAILED DESCRIPTION

[0069] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0071] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0072] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0073] See also Figure 1 As shown, according to an embodiment of the present application, a method for in-situ leaching uranium is provided, comprising:

[0074] Step S101: Acquire well logging data corresponding to the area to be mined, where the well logging data at least includes lithologic distribution, mineralized stratum characteristics, uranium grade, and uranium content per square meter.

[0075] In this embodiment, the area to be mined may contain both thick ore bodies and layered ore bodies. It is understood that a thick ore body refers to a single ore body with a large thickness in the depth direction, while a layered ore body refers to an ore body with multiple layers stacked in the depth direction.

[0076] First, the pumping and injection well pattern corresponding to the proposed mining area is determined based on the preliminary geological exploration results. Then, process drilling is carried out in the proposed mining area according to the pumping and injection well pattern. Next, the geological characteristics within each process borehole are measured using logging instruments such as resistivity and gamma logs to obtain data such as the lithologic distribution, ore-bearing strata, uranium grade, and uranium content per square meter. Finally, reverse grouting is used to insert casing into each process borehole for cementing. It should be noted that during process drilling, the drilling depth is controlled based on the preliminary geological exploration results and must penetrate the bottom of the ore deposit. For example, if the bottom depth of a thick or layered ore body is 200 meters, the drilling depth must exceed 200 meters, such as 210 meters, to ensure coverage of the entire ore layer and the lower sealing section.

[0077] Lithology distribution refers to the rock types at different depths in the drilled hole, such as sandstone, mudstone, and conglomerate. This is used to identify the interface between the ore layer and the non-ore layer. Ore-bearing stratum characteristics are used to determine the specific depth, thickness, and number of layers in the ore layer. Uranium grade refers to the uranium content per unit of ore, reflecting the ore's richness or depletion. Uranium per square meter refers to the uranium reserves per square meter of the ore layer and is used to assess the economic value of the ore layer.

[0078] It's understandable that analyzing well logging data tables can clarify the distribution of ore layers at different depths, grade variations, and lithologic characteristics, providing a basis for subsequent filter design and stratified mining plans. For example, if well logging data indicates the presence of multiple thin ore layers at a certain depth—that is, a layered ore body—then a layered injection or pumping structure should be designed for that depth. If low-grade interlayers are discovered within a thick ore body, the filter position can be adjusted to avoid ineffective layers.

[0079] Step S201: Divide the depth of the area to be mined into multiple layers at preset intervals, and count the total thickness of the mineralized section of each process drill hole in the corresponding sandstone layer by layer. Then group them by injection and mining units, and calculate the average mineralized thickness of each layer of all process drill holes in each injection and mining unit layer by layer.

[0080] In this embodiment, the predetermined interval is related to the characteristics of the ore layer and the design length of the filter.

[0081] First, the mining area is divided into fixed intervals of 5 to 10 meters based on the geological characteristics of the ore body, such as lithology and ore layer continuity, as determined by preliminary geological exploration of the proposed mining area, combined with the distribution of ore sections revealed by process drilling. It is important to note that this division must cover all ore sections, with at least five ore-bearing layers being stratified to ensure sufficient stratification to avoid missing thin ore layers or interlayers. For example, if the total depth of the proposed mining area is 50 meters, the preset interval is 10 meters, resulting in five ore-bearing layers: 0 to 10 meters, 10 to 20 meters, 20 to 30 meters, 30 to 40 meters, and 40 to 50 meters. Then, to analyze the ore occurrence in the proposed mining area and enable precise mining planning, the total thickness of the ore-bearing sections in the corresponding sandstone, as detected by each process drill hole, is calculated layer by layer, starting from the upper boundary of each ore-bearing layer and at preset intervals. For example, within an ore-bearing layer of 0 to 10 meters, a certain process drill hole corresponds to three ore sections with thicknesses of 2 meters, 1.5 meters, and 0.8 meters, respectively. The total ore-bearing thickness of the process drill hole within the ore-bearing layer of 0 to 10 meters is 2 + 1.5 + 0.8 = 4.3 meters. It can be understood that the ore-bearing section refers to the ore section of the ore layer where the ore grade reaches industrial standards and needs to be identified in combination with logging data. Sandstone refers to non-mineralized rock formations such as mudstone and conglomerate, and the ore is mostly stored in the pores of the sandstone. Next, taking the injection-production unit as the unit, the total thickness of the ore-bearing section of each layer for all process drill holes within the unit is summarized, and then the average value is calculated to obtain the average ore-bearing thickness of each layer for all process drill holes within each injection-production unit. It can be understood that the injection-production unit is a plurality of pumping wells consisting of process drill holes. Since the locations of the injection and production units are different, by calculating the average ore-bearing thickness of each layer of all process drill holes in each injection and production unit, the development degree of different lateral areas of each ore-bearing layer can be quantified, providing data support for the subsequent determination of the filter installation position and injection volume distribution.

[0082] Step S301: Taking the injection and mining units as elements, construct an ore-bearing matrix of each ore-bearing layer according to the spatial distribution of the injection and mining units in the area to be mined, and fill the average ore-bearing thickness of each injection and mining unit in the corresponding ore-bearing layer into the ore-bearing matrix in position order.

[0083] In this embodiment, each injection and mining unit is an element position in the ore-bearing matrix, and its spatial arrangement order must be consistent with the actual mining area layout to ensure that the ore-bearing matrix can intuitively reflect the spatial relative relationship of the injection and mining units.

[0084] Here, first, in the horizontal direction, the entire area to be mined is divided into N injection-mining units, and the N injection-mining units are distributed in an orderly manner in a rectangular grid. Each injection-mining unit corresponds to a unique spatial coordinate, which can be identified by the center coordinates of the well group of the injection-mining unit, so as to accurately locate the horizontal position of each injection-mining unit in the area to be mined; secondly, in the vertical direction, the area to be mined is divided into n ore-bearing layers from deep to shallow according to preset intervals, and each ore-bearing layer corresponds to an independent ore-bearing matrix, which is used to record the average ore-bearing thickness of all injection-mining units within the depth range; finally, based on the correspondence between the spatial coordinates of the injection-mining unit and the depth of the ore-bearing layer, the average ore-bearing thickness of each injection-mining unit in different ore-bearing layers is filled in its position in the corresponding ore-bearing matrix, that is, the average ore-bearing thickness of a certain injection-mining unit in the i-th ore-bearing layer will be filled in the matrix element position corresponding to the coordinates of the injection-mining unit in the i-th ore-bearing matrix, thereby forming a complete matrix system that can reflect the ore-bearing characteristics of different depths.

[0085] Step S401: Based on the layer association analysis of the mineralization matrix, determine the layered mining layer, which includes multiple development layers.

[0086] In this embodiment, a horizon correlation analysis is performed based on the mineralization matrix constructed in step S301 to analyze the spatial correlation between mineralized areas in different mineralized layers. This allows the identification of layers with mining value and suitable for stratified mining, i.e., the determination of stratified mining layers, which include multiple development layers. This avoids the subjectivity and blindness of layer judgment in traditional mining. Through data-based analysis, the determination of development layers is more scientific and reasonable, providing the right direction for subsequent efficient mining.

[0087] Here, step S401 includes:

[0088] Step S4011: identifying the dominant ore layer;

[0089] Step S4012: merging layers;

[0090] Step S4013: Determine the development boundary.

[0091] In step S4011, first, elements in each ore-bearing matrix whose average ore-bearing thickness is not less than a preset thickness are assigned a value of 1, and all other elements are assigned a value of 0. Then, the percentage of elements with a value of 1 in each ore-bearing matrix relative to the total number of elements is calculated. Finally, the ore-bearing layer corresponding to the ore-bearing matrix with the highest percentage is selected as the dominant ore layer. Specifically, in this embodiment, the determination of the preset thickness is directly related to the preset interval, with 20% of the preset interval being used as the preset thickness. For example, if the preset interval is 10 meters, the preset thickness is 10 meters x 20% = 2 meters. At this point, each element in each ore-bearing matrix, i.e., the average ore-bearing thickness of each injection-mining unit in the corresponding ore-bearing layer, is individually evaluated. If the average ore-bearing thickness is greater than or equal to 2 meters, the ore-bearing condition of the injection-mining unit in the ore-bearing layer meets the basic criteria for dominant ore layer identification, and the element is assigned a value of 1. If the average ore-bearing thickness is less than 2 meters, the ore-bearing condition does not meet the criteria, and the element is assigned a value of 0. After all elements are assigned values, the number of elements with a value of 1 in each ore-bearing matrix is ​​counted and then divided by the total number of elements in the matrix to obtain the corresponding percentage. This percentage directly reflects the proportion of injection and mining units in the ore-bearing layer that meet the preset thickness standard. The higher the percentage, the more obvious the overall ore-bearing advantage of the ore-bearing layer. The ore-bearing layer corresponding to the ore-bearing matrix with the highest percentage is then selected as the dominant ore-bearing layer. In this embodiment, the location of the injection and mining units corresponding to the elements assigned a value of 1 in each ore-bearing matrix is ​​called the ore-bearing area.

[0092] Among them, in step S4012, the logic of stratum merging is divided into the following two cases based on whether there are ore-bearing layers on both sides of the dominant ore layer in the depth direction. In some specific examples, when there are ore-bearing layers on both sides of the dominant ore layer in the depth direction, the stratum merging is performed according to the following process: First, the overlap of the ore-bearing area between the dominant ore layer and the upper adjacent ore-bearing layer, and the overlap of the ore-bearing area between the dominant ore layer and the lower adjacent ore-bearing layer are calculated respectively. It should be noted that the overlap of the ore-bearing area refers to the number of overlapping elements in the ore-bearing areas of the two adjacent ore-bearing layers accounting for all the elements in the ore-bearing areas of the dominant ore layer, which is used to intuitively reflect the degree of spatial overlap between the ore-bearing areas of the dominant ore layer and the adjacent ore-bearing layer; then, a decision is made based on the difference between the overlap of the two ore-bearing areas: if the difference between the two is not less than 2%, it means that the spatial correlation between the dominant ore layer and the adjacent ore-bearing layer on one side is closer, and the consistency of the mineralization characteristics is stronger. At this time, the adjacent ore-bearing layer on the side with the higher overlap of the dominant ore layer and the ore-bearing area is merged to form a development stratum. For example, if the dominant ore layer has a 70% overlap with the upper ore-bearing layer and a 65% overlap with the lower ore-bearing layer, and the difference is 5% or not less than 2%, the dominant ore layer and the upper ore-bearing layer will be merged. If the difference between the two is less than 2%, a comprehensive judgment needs to be made based on the principle of similar lithology and the thickness of the interlayer mudstone. Priority is given to the adjacent ore-bearing layer with a lithology more similar to the dominant ore layer. For example, the lithology is medium-grained sandstone, and the rock parameters such as porosity and permeability are similar, and the mudstone thickness between the two layers is less than 1.5 meters. The dominant ore layer and the ore-bearing layer on this side are merged into one development layer. This is done because similar lithology can ensure that the effect of the leaching agent is consistent within the layer, and the thinner mudstone layer can reduce interference between different ore-bearing layers, which is conducive to improving mining efficiency. In other specific examples, when there is a mineralized layer on only one side of the dominant mineral layer in the depth direction, the following steps are required to make a horizon merging decision: first, calculate the overlap of two groups of mineralized areas, one group is the overlap of the mineralized areas between the dominant mineral layer and the adjacent mineralized layer, and the other group is the overlap of the mineralized areas between the adjacent mineralized layer and the mineralized layer on the side away from the dominant mineral layer; then, determine the merging plan by comparing the sizes of the two groups of overlaps: if the overlap of the mineralized areas between the dominant mineral layer and the adjacent mineralized layer is greater than the overlap of the mineralized areas between the adjacent mineralized layer and the mineralized layer on the far side, it means that the spatial correlation between the dominant mineral layer and the adjacent mineralized layer is closer and the mineralized characteristics are more consistent, so the two are merged into one development horizon; on the contrary, if the overlap of the mineralized areas between the dominant mineral layer and the adjacent mineralized layer is smaller, it means that the correlation between the adjacent mineralized layer and the far side mineralized layer is more significant. At this time, the adjacent mineralized layer and the far side mineralized layer are merged into one development horizon, and the dominant mineral layer is weaker in correlation with the surrounding mineralized layers and is used as another development horizon alone. For example, when multiple mineralized layers are numbered from deep to shallow, and there are adjacent mineralized layers above and below the dominant mineralized layer (layer x), the formula for calculating the mineralized area overlap between the dominant mineralized layer (layer x) and the underlying mineralized layer (layer x-1) is as follows:

[0093]

[0094] The calculation formula for the overlap between the dominant ore layer (layer x) and the upper ore-bearing layer (layer x+1) is as follows:

[0095]

[0096] Where R x-1 / x is the overlap between the dominant ore layer and the underlying ore-bearing layer, R x+1 / x M is the overlap between the dominant ore layer and the upper ore-bearing layer, x is the mineralization matrix for the dominant ore layer, M x-1 is the mineralization matrix corresponding to the mineralization layer below the dominant mineral layer, M x+1 It is the ore-bearing matrix corresponding to the ore-bearing layer above the dominant ore layer.

[0097] It should be noted that, in this embodiment, the calculation formulas for the overlap of mineralized areas between two adjacent mineralized layers are constructed based on the idea of ​​combining set operations with matrix characteristics. By replacing the mineralized matrix of the corresponding layer in the above formula, it can be expanded to calculate the overlap of mineralized areas between any adjacent mineralized layers.

[0098] In addition, in step S4012, after the dominant mineral layer is merged with the adjacent mineral-bearing layer, the remaining unmerged mineral-bearing layers need to be merged. The logic of the stratum merging of the remaining unmerged mineral-bearing layers is divided into the following three cases based on the number of the remaining unmerged mineral-bearing layers. In some specific examples, after the stratum merging of the dominant mineral layer is completed, when the number of the remaining unmerged mineral-bearing layers is not less than three, the sub-dominant mineral layer is identified from the remaining unmerged mineral-bearing layers, and the sub-dominant mineral layer is merged according to the stratum merging rules of the dominant mineral layer. If after the stratum merging of the sub-dominant mineral layer, the number of the remaining unmerged mineral-bearing layers is still not less than three, the steps of identifying the sub-dominant mineral layer from the remaining unmerged mineral-bearing layers and merging the sub-dominant mineral layer according to the stratum merging rules of the dominant mineral layer are repeated until the number of the remaining unmerged mineral-bearing layers is less than three. In this process, when the ore-bearing layer to be merged with the sub-dominant ore layer is located in a determined development layer: if there is no other ore-bearing layer on the other side of the sub-dominant ore layer, the sub-dominant ore layer will be merged into the determined development layer; if there is other ore-bearing layer on the other side of the sub-dominant ore layer, the sub-dominant ore layer and the ore-bearing layer on the other side will be merged into a new development layer. In other specific examples, after completing the stratum merging of the dominant ore layer, if there are two ore-bearing layers remaining that have not been merged: if the two ore-bearing layers are adjacent to each other, the two ore-bearing layers will be merged into one development layer; if the two ore-bearing layers are dispersed, each ore-bearing layer will be merged with its spatially adjacent and determined development layer, and ensure that the difference in the number of ore-bearing layers in the adjacent development layers after the merger does not exceed two layers. In some specific examples, after completing the merging of dominant strata, if there is only one remaining unmerged stratum containing minerals, the mineralized stratum is merged with its spatially adjacent, already-determined development stratum, ensuring that the difference in the number of mineralized strata between the adjacent development strata after the merger does not exceed two. It should be noted that the method for determining sub-dominant strata is the same as that for dominant strata and is not further described here.

[0099] In step S4013, based on the mineralization matrix of the dominant ore layer in each development horizon, the positions adjacent to the elements with a value of 1 and a value of 0 in the mineralization matrix are used as development boundaries to divide the planar development range. It should be noted that the dominant ore layer in each development horizon refers to the ore-bearing layer in each development horizon that has the highest proportion of injection and mining units that meet the preset thickness standard.

[0100] Step S501: Calculate the design length of the filter and the lowering depth of the upper interface of the filter according to the number of ore-bearing layers at the overlapping locations of the ore-bearing areas in each development horizon.

[0101] In this embodiment, the filter's design length and upper interface lowering depth are calculated based on the number of ore-bearing layers at the overlapping locations of the target development horizon. When the number of overlapping ore-bearing layers is large, the filter needs to be long enough to cover these layers; its lowering depth is determined based on the depth of the development horizon to ensure the filter accurately covers the target development horizon. This calculation allows the filter to precisely cover the overlapping ore-bearing areas of the target development horizon, avoiding the ineffective coverage of non-ore layers by conventional long filters, improving the utilization efficiency of the leachate, and reducing waste.

[0102] Here, the design length of the filter and the lowering depth of the upper interface of the filter are calculated according to the number of mineral-bearing layers at the overlapping of mineral-bearing areas in each development layer, which are divided into the following two cases.

[0103] In some specific examples, the same development layer is developed using filters of the same length. The design length of the filter complies with the formula:

[0104] L=Num1*A*σ

[0105] Where L is the design length of the filter, Num1 is the upper limit of the number of ore-bearing layers at the overlapping of ore-bearing areas in the development horizon, σ is the empirical coefficient, ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters.

[0106] The lowering depth of the filter's upper interface complies with the formula:

[0107] H=H1-Num1*A / 2-L / 2

[0108] Where H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num1 is the upper limit of the number of ore-bearing layers at the overlapping of ore-bearing areas in the development horizon, A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters, and L is the design length of the filter.

[0109] In other specific examples, the same development layer is developed using filters of different lengths. The design length of the filter complies with the formula:

[0110] L=Num2*A*σ

[0111] Where L is the design length of the filter, Num2 is the number of ore-bearing layers where the ore-bearing areas overlap in the corresponding development horizon of each injection-production unit, σ is an empirical coefficient ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers ranging from 5 to 10 meters.

[0112] Among them, for the process drill holes that are not located at the position where the number of overlapping layers of the mineral-bearing layers changes in the development layer, the corresponding lowering depth of the upper interface of the filter conforms to the formula:

[0113] H=H1-Num2*A / 2-L / 2

[0114] Where H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num2 is the number of ore-bearing layers where the ore-bearing areas of each injection-production unit overlap in the corresponding development horizon, A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters, and L is the design length of the filter.

[0115] Among them, for the process drill holes located at the position where the number of overlapping layers of mineral-bearing layers in the development layer changes, the corresponding lowering depth of the upper interface of the filter conforms to the formula:

[0116] H=H1-L*(1+σ) / 2σ

[0117] Where H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development layer, L is the design length of the filter, and σ is the empirical coefficient, ranging from 0.5 to 1.

[0118] Step S601: mining in sequence from deep to shallow according to the depth of the development layer.

[0119] In this embodiment, mining the deeper development layers first, followed by gradually mining the shallower layers, prevents upper-layer mining from disturbing the underlying unmined layers. Mining the shallower layers first could disrupt the geological structure of the deeper layers, impacting subsequent mining. This sequence also reduces gravity-induced cross-flow of leachate into the mined areas, blocking the path of the dominant flow. This ensures optimal leaching performance at each development layer, improving uranium leaching efficiency and resource recovery.

[0120] Here, starting with the deepest development layer, wells are drilled after the filter depth is determined, creating an underground leaching field. Once the uranium concentration in the deepest development layer drops to a critical value, the filter in the next development layer is unsealed, and the mined development layer is separated using packers or cement injection. Then, new wells are drilled to create a new leaching field until all development layers are mined.

[0121] By applying the technical solution of this embodiment, based on logging data, multiple layers of mineralized layers are divided according to preset depth intervals, and an mineralized matrix is ​​constructed in combination with the spatial distribution of injection and production units. This can associate the average mineralized thickness with the spatial position, and intuitively quantify the development differences of mineralized layers at different depths and in different areas, thus solving the problem of vague description of multi-layer heterogeneity characteristics and difficulty in accurately locating the target mineral layer in traditional mining.

[0122] By applying the technical solution of this embodiment, the stratum correlation analysis can provide a data-based and visual decision-making basis for the subsequent division of strata for stratified mining by mining the overlap, continuity and other relationships between mineral-bearing strata through matrix data, thus avoiding the subjectivity and blindness of manual stratification.

[0123] By applying the technical solution of this embodiment, the filter parameters are calculated based on the number of mineral-bearing layers at the overlapping mineral-bearing areas in the development layer, so that the filter can accurately cover the overlapping mineral-bearing areas of the target development layer, avoiding the ineffective coverage of non-mineral layers by traditional long filters, and reducing the dilution and waste of the leaching agent in the non-mineral layer.

[0124] By applying the technical solution of this embodiment, the filter parameters are dynamically adapted to the ore layer structure, which can ensure that the leachate acts concentratedly on the high-ore-containing area, improve the contact efficiency between the leachate and the ore, and solve the problem of uneven leachate distribution in traditional layered mining.

[0125] By applying the technical solution of this embodiment and adopting a layered mining sequence from deep to shallow, it is possible to avoid disturbance of the lower unmined strata by upper mining, reduce the cross-flow of the leachate to the mined area due to gravity, and block the formation path of the dominant flow from a process perspective.

[0126] By applying the technical solution of this embodiment, for the independent mining of each development layer, combined with the precision filter design, the leaching agent can be uniformly penetrated in the target development layer, thereby improving the uranium leaching rate and thus improving the resource recovery rate.

[0127] Furthermore, the specific implementation process of this embodiment is described by taking the development of an in-situ leaching uranium mine in Inner Mongolia as an example.

[0128] First, the well logging data corresponding to the area to be mined in the mine is obtained. The well logging data of a certain process borehole is shown in Table 1.

[0129] Table 1 Logging data sheet of a certain process drilling

[0130]

[0131] Next, based on the acquired logging data, the ore body in the mining area was stratified. First, the ore body, ranging from 92 to 117 meters in depth, was divided into five ore-bearing layers at preset intervals of 5 meters. The layers were numbered in descending order of depth. The fifth ore-bearing layer ranged from 92 to 97 meters, the fourth ore-bearing layer from 97 to 102 meters, the third ore-bearing layer from 102 to 107 meters, the second ore-bearing layer from 107 to 112 meters, and the first ore-bearing layer from 112 to 117 meters. Then, starting from the fifth ore-bearing layer, the total thickness of the ore-bearing section in the corresponding sandstone for each process drill hole was calculated layer by layer. Next, the average ore-bearing thickness of each layer for all process drill holes within each injection and production unit was calculated layer by layer. The injection and production units were arranged using a five-point well pattern, with each unit consisting of four injection wells and one extraction well. Among them, the statistical results of the average ore-bearing thickness of each ore-bearing layer corresponding to a certain injection and mining unit are shown in Table 2.

[0132] Table 2 Statistical results of average ore-bearing thickness of each ore-bearing layer corresponding to a certain injection and mining unit

[0133]

[0134] Then, according to step 301, the average ore-bearing thickness data of all injection and mining units in each ore-bearing layer in the area to be mined is counted, and an ore-bearing matrix is ​​constructed. Each injection and mining unit is taken as an element. According to its spatial distribution characteristics in the horizontal direction of the area to be mined, an ore-bearing matrix of each layer with a total of 248 elements is constructed. The matrices are numbered in a depth-to-shallow manner to obtain matrices M1, M2, M3, M4 and M5. The average ore-bearing thickness of all injection and mining units in each layer counted above is recorded in the ore-bearing matrix in order of position. The elements with an average ore-bearing thickness greater than 1 meter are assigned a value of 1, and the remaining elements in the matrix are assigned a value of 0. The obtained stratified ore-bearing matrix of the mining area to be mined can be found in Figure 2 and Figure 3 As shown in the figure, black grids represent element values ​​of 1, and white grids represent element values ​​of 0.

[0135] Next, we calculated the percentage of elements with a median value of 1 in each ore-bearing matrix relative to the total number of elements (P). The ore-bearing layer corresponding to the ore-bearing matrix with the highest percentage was selected as the dominant ore layer. Table 3 shows the percentage of elements with a median value of 1 in each ore-bearing matrix relative to the total number of elements. As shown in Table 3, Layer 2 is the dominant ore layer.

[0136] Table 3 The percentage of the number of elements with a median value of 1 in the mineral matrix corresponding to each mineral-bearing layer to the total number of elements

[0137] Ore-bearing layer Percentage (P) The first ore-bearing layer 58.1％ Second ore-bearing layer 90.3％ The third ore-bearing layer 29％ The fourth ore-bearing layer 33.9％ The 5th mineralized layer 19％

[0138] Next, the degree of overlap (R) between the dominant ore layer and the two adjacent ore-bearing layers is calculated, namely, the degree of overlap between the second ore-bearing layer and the first ore-bearing layer, and between the second ore-bearing layer and the third ore-bearing layer. The calculation results are shown in Table 4. If the results show that R1 / 2 is greater than R3 / 2, the first and second ore-bearing layers are mined together to obtain the first development horizon.

[0139] Table 4 Calculation results of the overlap between the dominant ore layer and the two adjacent ore-bearing layers

[0140] Coincidence (R) The first and second ore-bearing layers 53.6％ The third ore-bearing layer and the second ore-bearing layer 32.1％

[0141] Afterwards, since there were still three remaining ore-bearing layers and the mining method had not yet been determined, the ore-bearing layer with the highest P value was selected as the sub-dominant ore layer. Among the third, fourth, and fifth ore-bearing layers, the fourth ore-bearing layer had a higher P value, so it was selected as the sub-preferred ore layer. The degree of overlap between the ore-bearing area of ​​the sub-dominant ore layer and the two adjacent ore layers was calculated, and the results are shown in Table 5. The results show that R3 / 4 is greater than R5 / 4, so the third and fourth ore-bearing layers are mined together to obtain the second development layer. Since the fifth ore-bearing layer is the only ore-bearing layer with an undetermined development layer, the fifth ore-bearing layer can be mined together with the second development layer, provided that the difference in the number of ore-bearing layers between the development layers does not exceed two layers. At this point, the stratified mining design for the area to be mined is as follows: the first and second ore-bearing layers are assigned to the first development horizon, while the third, fourth, and fifth ore-bearing layers are assigned to the second development horizon. Furthermore, based on the element distribution of the dominant ore matrix within each development horizon, the planar development boundary of each development horizon is defined, with the injection-mining unit corresponding to the position with an element value of 0 and adjacent to a position with an element value of 1 in the ore-bearing matrix as the boundary.

[0142] Table 5 Calculation results of the overlap between the secondary dominant ore layer and the two adjacent ore-bearing layers

[0143] Coincidence (R) The third and fourth ore-bearing layers 71.4％ The 5th and 4th ore-bearing layers 26.2％

[0144] Finally, after determining the development horizons for stratified development, the design filter length and the upper filter interface lowering depth are calculated based on the number of ore-bearing layers at the overlapping ore-bearing areas within each development horizon. In this case, filters of different lengths were used within the same development horizon. Specifically, the filter length was designed based on the number and depth of ore-bearing layers within the development horizon, with an empirical coefficient of 0.8 and a 5-meter interval between ore-bearing layers. The filter lengths are shown in Table 6, and the upper filter interface lowering depths are shown in Table 7.

[0145] Table 6 Filter length table

[0146] Serial number Filter length (m) 1 4 2 8 3 12

[0147] Table 7 Depth of filter upper interface lowering for different development layers and mining layers

[0148]

[0149] It should be noted that at this Inner Mongolia uranium mine, which uses dual-layer mining of the first and second development horizons, the effective impregnation volume ratio on day 1000 remained stable at 59.4%. When dual-layer mining was not used, the effective impregnation volume ratio remained stable at 42.4%. This demonstrates that the in-situ uranium leaching method provided in the examples of this application can impregnate more ore bodies in the same amount of time, demonstrating excellent leaching results and recovery capacity.

[0150] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0151] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A method for in-situ leaching of uranium, characterized in that: include: Acquire well logging data corresponding to the area to be mined, wherein the well logging data includes at least lithologic distribution, characteristics of ore-bearing strata, uranium grade, and uranium content per square meter; Divide the depth of the area to be mined into multiple layers of ore-bearing layers at preset intervals, calculate the total thickness of the ore-bearing sections of each process drill hole in the corresponding sandstone layer by layer, then group them by injection and mining units, and calculate the average ore-bearing thickness of each layer of all the process drill holes in each injection and mining unit layer by layer; Taking the injection and mining units as elements, constructing an ore-bearing matrix for each ore-bearing layer according to the spatial distribution of the injection and mining units in the to-be-mined area, and filling the ore-bearing matrix with the average ore-bearing thickness of each injection and mining unit corresponding to the ore-bearing layer in positional order; Determining a stratum mining horizon based on a horizon correlation analysis of the ore-bearing matrix, wherein the stratum mining horizon includes a plurality of development horizons; Calculating the design length of the filter and the lowering depth of the upper interface of the filter according to the number of the mineral-bearing layers at the overlapping locations of the mineral-bearing areas in each of the development horizons; Mining is carried out in sequence from deep to shallow according to the depth of the development layer.

2. The in-situ leaching method for uranium mining according to claim 1, characterized in that: The determination of the stratum mining positions based on the stratum correlation analysis of the ore-bearing matrix includes: Identification of dominant mineral layers; Layer merging; Development boundaries are determined.

3. The in-situ leaching method for uranium mining according to claim 2, characterized in that: The identification of the dominant mineral layer includes: Assigning a value of 1 to the elements in each of the mineralization matrices whose average mineralization thickness is not less than a preset thickness, and assigning a value of 0 to the remaining elements; Calculate the percentage of the number of elements with a median value of 1 in each of the mineral-bearing matrices to the total number of elements; The ore-bearing layer corresponding to the ore-bearing matrix with the highest percentage is selected as the dominant ore layer.

4. The in-situ leaching method for uranium mining according to claim 2, characterized in that: The merging of the horizons includes: In the case where there are ore-bearing layers on both sides of the dominant ore layer in the depth direction, respectively calculating the overlap between the dominant ore layer and the ore-bearing regions of the adjacent ore-bearing layers on both sides; If the difference in the degree of overlap between the dominant ore layer and the ore-bearing areas of the adjacent ore-bearing layers on both sides is not less than 2%, the adjacent ore-bearing layers on the side with a higher degree of overlap between the dominant ore layer and the ore-bearing areas are merged into one development horizon; If the difference in overlap between the dominant ore layer and the ore-bearing areas of the adjacent ore-bearing layers on both sides is less than 2%, combined with the principle of similar lithology and the decision of interlayer mudstone thickness, the dominant ore layer and the adjacent ore-bearing layer on the side with more similar lithology and interlayer mudstone thickness less than 1.5 meters will be merged into one development layer.

5. The in-situ leaching method for uranium mining according to claim 2, characterized in that: The merging of the horizons includes: In the case where only one of the two sides of the dominant mineral layer in the depth direction has the mineral-bearing layer, the overlap between the dominant mineral layer and the mineral-bearing region of the adjacent mineral-bearing layer, and the overlap between the mineral-bearing region of the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer are calculated; If the degree of overlap between the dominant ore layer and the adjacent ore-bearing layer is greater than the degree of overlap between the adjacent ore-bearing layer and the ore-bearing layer on the side away from the dominant ore layer, the dominant ore layer and the adjacent ore-bearing layer are merged into one development horizon; If the degree of overlap between the dominant mineral layer and the mineral-bearing area of ​​the adjacent mineral-bearing layer is less than the degree of overlap between the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer, the adjacent mineral-bearing layer and the mineral-bearing layer on the side away from the dominant mineral layer are merged into one development layer, and the dominant mineral layer is separately used as another development layer.

6. The in-situ leaching method for uranium mining according to claim 4 or 5, characterized in that: The layer merging further includes: After completing the stratum merging of the dominant ore layers, if the number of the remaining unmerged ore-bearing layers is not less than three, identifying sub-dominant ore layers from the remaining unmerged ore-bearing layers, and merging the sub-dominant ore layers according to the stratum merging rules of the dominant ore layers; If, after the horizons of the sub-dominant ore layer are merged, the number of the remaining unmerged ore-bearing layers is still not less than three, the steps of identifying the sub-dominant ore layer from the remaining unmerged ore-bearing layers and merging the sub-dominant ore layer according to the horizon merging rule of the dominant ore layer are repeated until the number of the remaining unmerged ore-bearing layers is less than three; Wherein, when the mineral-bearing layer merged with the sub-dominant mineral layer is located within the determined development horizon: If there is no other ore-bearing layer on the other side of the sub-dominant ore layer, merge the sub-dominant ore layer into the determined development layer; If there is another mineral-bearing layer on the other side of the sub-dominant mineral layer, the sub-dominant mineral layer and the mineral-bearing layer on the other side are merged into one development layer.

7. The in-situ leaching method for uranium mining according to claim 4 or 5, characterized in that: The layer merging further includes: After completing the merging of the dominant ore layers, if there are two ore-bearing layers remaining that have not been merged: If the two mineral-bearing layers are adjacent to each other, the two mineral-bearing layers are merged into one development layer; If the two mineral-bearing layers are dispersed, each mineral-bearing layer shall be merged with its spatially adjacent and determined development layer, and ensure that the difference in the number of mineral-bearing layers of the adjacent development layers after the merger does not exceed two layers.

8. The in-situ leaching method for uranium mining according to claim 4 or 5, characterized in that: The layer merging further includes: After completing the merging of the dominant mineral layers, if the number of the remaining unmerged mineral-bearing layers is only one, the mineral-bearing layer shall be merged with the spatially adjacent and determined development layer, and ensure that the difference in the number of mineral-bearing layers of the adjacent development layers after the merger does not exceed two layers.

9. The in-situ leaching method for uranium mining according to claim 1, characterized in that: When the same development layer is developed using the filter of the same length: The design length of the filter complies with the formula: L=Num1*A*σ Wherein, L is the design length of the filter, Num1 is the upper limit of the number of ore-bearing layers at the overlapping ore-bearing areas in the development horizon, σ is an empirical coefficient, ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters; The lowering depth of the upper interface of the filter complies with the formula: H=H1-Num1*A / 2-L / 2 In the formula, H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num1 is the upper limit of the number of mineral-bearing layers at the overlapping of mineral-bearing areas in the development horizon, A is the interval value of the mineral-bearing layers, ranging from 5 to 10 meters, and L is the design length of the filter.

10. The in-situ leaching method of uranium according to claim 1, characterized in that: When the same development layer is developed using filters of different lengths: The design length of the filter complies with the formula: L=Num2*A*σ Wherein, L is the design length of the filter, Num2 is the number of the ore-bearing layers at the overlapping ore-bearing areas of each injection-production unit in the corresponding development horizon, σ is an empirical coefficient, ranging from 0.5 to 1, and A is the interval value of the ore-bearing layers, ranging from 5 to 10 meters; Among them, for the process drill hole that is not located at the position where the number of overlapping layers of the mineral-bearing layer in the development layer changes, the corresponding lowering depth of the upper interface of the filter meets the formula: H=H1-Num2*A / 2-L / 2 Wherein, H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development horizon, Num2 is the number of layers of the ore-bearing layer at the overlapping ore-bearing area of ​​each injection-production unit in the corresponding development horizon, A is the interval value of the ore-bearing layer, ranging from 5 to 10 meters, and L is the design length of the filter; Among them, for the process drill hole located at the position where the number of overlapping layers of the mineral-bearing layer changes in the development layer, the corresponding lowering depth of the upper interface of the filter meets the formula: H=H1-L*(1+σ) / 2σ Where H is the lowering depth of the upper interface of the filter, H1 is the lower boundary depth of the development layer, L is the design length of the filter, and σ is an empirical coefficient with a value range of 0.5 to 1.

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