LU504248B1 - Method for detecting leaching and groundwater pollution range after acid in-situ leaching uranium mining - Google Patents
Method for detecting leaching and groundwater pollution range after acid in-situ leaching uranium mining Download PDFInfo
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- LU504248B1 LU504248B1 LU504248A LU504248A LU504248B1 LU 504248 B1 LU504248 B1 LU 504248B1 LU 504248 A LU504248 A LU 504248A LU 504248 A LU504248 A LU 504248A LU 504248 B1 LU504248 B1 LU 504248B1
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- Prior art keywords
- range
- leaching
- acid
- groundwater pollution
- uranium mining
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- 238000002386 leaching Methods 0.000 title claims abstract description 53
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 28
- 238000003895 groundwater pollution Methods 0.000 title claims abstract description 28
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000005065 mining Methods 0.000 title claims abstract description 27
- 239000002253 acid Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000000704 physical effect Effects 0.000 claims abstract description 6
- 238000012937 correction Methods 0.000 claims abstract description 4
- 238000009499 grossing Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 238000005070 sampling Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention provides a method for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining, which comprises the following steps: (a) arranging measuring lines in a detection area, and setting measuring points on the measuring lines; (b) transmitting signals with different frequencies by a transmitter, receiving electric and magnetic field signals coupled to the ground by a receiver, and converting signals into acquisition data after being calibrated by a grid value; (c) sequentially performing curve smoothing, near-field correction, one-dimensional inversion, two-dimensional inversion, and electric geological comprehensive interpretation on the acquired data to form a geophysical inversion result and a geological interpretation map of each measuring line; (d) setting up three-dimensional geological modeling on the detection area, and performing slice display on the model at different depths; and (e) obtaining the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining as well as a leakage point by combining physical property data of a detection target area. The method of the present invention is fast, economical, effective and simple to operate, and does not need to build monitoring wells and perform sampling and analysis.
Description
BL-5684
LU504248
METHOD FOR DETECTING LEACHING AND GROUNDWATER
POLLUTION RANGE AFTER ACID IN-SITU LEACHING URANIUM MINING
The present invention belongs to the field of in-situ leaching uranium mining and groundwater pollution detection, and particularly relates to a method for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining through controlled source audio-frequency magnetotellurics (CSAMT).
The traditional detection of a leaching range and a groundwater pollution range after in-situ leaching uranium mining is performed by monitoring wells through sampling analysis. Due to the heterogeneity of the stratum and the uncertainty of hydrogeological parameters, the leaching range and the groundwater pollution range cannot be accurately determined in advance, consequently, the positions, depths and number of monitoring wells for detecting the leaching range and the groundwater pollution range cannot be accurately determined. Through the sampling analysis of the monitoring wells, not only are sufficient monitoring wells required to be built and sampled and analyzed regularly, which causes high time consumption, high labor consumption, high cost, and high professional requirements, but also the migrated groundwater locally contains components with higher background, so that a true in-situ leaching liquid flow is not detected sometimes. At present, no effective method is available for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining.
The controlled source audio-frequency magnetotellurics (CSAMT) is one of electromagnetic methods, and is mainly characterized in that an artificially controlled field source is used for frequency sounding. The artificial field source can overcome the defect of weak signals of a natural field source, however, the non-planar wave characteristics of waves determine the complexity of data processing. Emission sources are arranged outside a certain range of a target detection area in the parallel direction of measuring lines during measurement, a receiving system is arranged in the detection area, and interpretation is performed according to acquisition data. The CSAMT measurement has different modes such as scalar and tensor 1
BL-5684
LU504248 according to different transmitting and receiving devices, is mainly based on a scalar array mode at present, and is widely used in the fields of engineering exploration, middle and shallow mineral exploration, geothermal field exploration, and the like.
An objective of the present invention 1s to provide a method for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining, which is fast, economical, effective and simple to operate, and does not need to build monitoring wells and perform sample analysis.
The present invention relates to a method for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining, which uses the controlled source audio-frequency magnetotellurics (CSAMT) to detect the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining, and specifically comprises the following steps: (a) arranging a plurality of parallel and equidistant measuring lines in a detection area by using a GPS method, and setting a plurality of equidistant measuring points on each measuring line; (b) using a scalar measurement method of controlled source audio-frequency magnetotellurics (CSAMT) detection, and arranging a transmitter at a position 7-9 km away from a detection target area; arranging a receiver at the position of the detection target area; using a dipole line source for transmission by the transmitter, and using a scalar array for receiving by the receiver; wherein a distance between the transmitter and the receiver is 7-9 km, and transmitting is performed from the same transmitting point in a measuring line; transmitting signals with different frequencies by the transmitter, receiving electric and magnetic field signals coupled to the ground by the receiver, and converting signals into acquisition data after being calibrated by a grid value; (c) sequentially performing curve smoothing, near-field correction, one-dimensional inversion, two-dimensional inversion, and electric geological comprehensive interpretation on the acquired data from the step (b) to form a geophysical inversion result and a geological 2
BL-5684
LU504248 interpretation map of each measuring line; (d) setting up three-dimensional geological modeling on the detection area according to the geophysical inversion result and the geological interpretation map obtained in the step (c), and performing slice display on the model at different depths; and (e) analyzing a condition of the model obtained in the step (d), and obtaining the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining as well as a leakage point by combining physical property data of the detection target area.
The present invention has the following effects: the method provided by the present invention does not need to build a large number of monitoring wells and does not need to perform a large number of sampling and analysis on the monitoring wells; in addition, the method can quickly, economically and effectively detect the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining and determine the area and volume of the spaces, find out the geological structure, and provide important guidance for the layout of the acid in-situ leaching uranium mining well site, the control of the leaching range and the prevention and control of groundwater pollution. If CSAMT detection can be performed before the acid in-situ leaching uranium mining, and a result of the CSAMT detection after the acid in-situ leaching uranium mining is compared with that of the detection before the acid in-situ leaching uranium mining, the excellent effect can be obtained.
The core of the present invention is that after the conventional prospecting CSAMT method is modified by acquiring parameters, supplemented with an optimal physical property weighted two-dimensional inversion method, and a three-dimensional visualization technology is used, so that the problems of rapid detection of the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining are well solved.
The difference between the present invention and the general CSAMT prospecting for water and ore prospecting lies in that, aiming at the problem of the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining, under a high-precision grid layout (20 meters MN polar distance), by acquiring high-density data of a target area, analyzing and processing two-dimensional data under strict conditions, combining logging 3
BL-5684
LU504248 information of standard grid, and assisting with laboratory physical property tests of partial samples (polluted and unpolluted), the computer three-dimensional visualization result of fine resistivity of a detection area is realized, a high-resolution underground three-dimensional resistivity distribution map of the pollution area can be obtained, and the problem of pollution distribution within 1000 meters below the ground surface is effectively solved.
FIG 1 is a diagram of the field layout of controlled source audio-frequency magnetotellurics (CSAMT);
FIG 2 is a three-dimensional geological structure diagram of a groundwater pollution range according to Example 1; and
FIG. 3 is a graph of pollution ranges at different elevations.
The following further describes the method for detecting the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining described in the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention is used in the investigation of groundwater pollution in the acid in-situ leaching uranium mining stopes 1* and 3* in China National Nuclear Coorperation 737
Uranium Industry Co., Ltd. in Xinjiang, and the detection depth is about 1000 m, namely the elevation is greater than or equal to 200 m.
As shown in FIG 1, the method for detecting the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining of the present invention comprises the following steps. (a) According to the field conditions, 10 parallel measuring lines are arranged from west to east in a detection area, the line distance is 50 meters, all positioning works (measuring points and transmitting points) are completed by GPS positioning, the requirement of exploration positioning precision is met, the measuring points are measured at equal intervals, and the measuring point distance is 20 meters. The specific data is shown in Table 1: 4
BL-5684
LU504248
Table 1. The layout of measuring points
Line Number of Length of
No. measuring measuring line points (m)
To 6 | 38 | 50 ow ew 0 | se | om (b) A scalar measurement method of controlled source audio-frequency magnetotellurics (CSAMT) detection is used. Since the trends of the ten measuring lines are parallel, a transmitting source can be set, namely a transmitter is arranged at a position 8 km away from a detection target area; a receiver at the position of the detection target area is arranged, the transmitter uses a dipole line source for transmission, transmitter dipole moment is 1400 m, and the receiver uses a scalar array for receiving; the distance between the transmitter and the receiver is 8 km; and transmitting is performed from the same transmitting point in a measuring line.
The transmitter transmits signals with different frequencies, and the receiver receives electric field and magnetic field signals coupled through the ground; and signals are converted into acquisition data after being calibrated by a grid value. Under the condition of a certain geoelectric structure, the transmitting and receiving frequency determines the depth of exploration. Since this work is mainly to know the spreading degree of underground sewage at a certain depth and the deep hidden structure, in order to improve the exploration resolution, the
BL-5684
LU504248 full frequency band of the transmitting and receiving frequency selected by this exploration work 1s 25 frequency points from 8192 Hz to 2 Hz, namely 8192.0 Hz, 5765.0 Hz, 4096.0 Hz, 2882.0 Hz, 2048.0 Hz, 1441.0 Hz, 1024.0 Hz, 721.0 Hz, 512.0 Hz, 360.0 Hz, 256.0 Hz, 180.0
Hz, 128.0 Hz, 90.0 Hz, 64.0 Hz, 45.0 Hz, 32.0 Hz, 22.0 Hz, 16.0 Hz, 11.3 Hz, 8.0 Hz, 5.63 Hz, 4.0 Hz, 2.81 Hz, and 2 Hz. (c) The curve smoothing, near-field correction, one-dimensional inversion, two-dimensional inversion, and electric geological comprehensive interpretation are sequentially performed on the acquired data from the step (b) to form a geophysical inversion result and a geological interpretation map of each measuring line. (d) Three-dimensional geological modeling is performed on the detection area according to the geophysical inversion result and the geological interpretation map obtained in the step (c), and slice display is performed on the model at different depths. (e) A condition of the model obtained in the step (d) is analyzed, and the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining as well as a leakage point is obtained by combining physical property data of the detection target area.
According to the above steps, the resistivity of the detection area is measured to be in a range below 500 Qem, and a low-resistance area with the resistivity of less than 5 Qem (excluding a low-resistivity background area of less than 5 Qem) is determined to be used as a groundwater pollution range. Therefore, it is estimated that the pollution range at the position with the elevation of 1060-1000 m is large, the pollution range is mainly distributed between the measuring line No. 2 and the measuring line No. 8, the maximum pollution area caused by stopes 1* and 3° is about 37630 m2, the large pollution range is located at the inversion elevation of 1020 m, and the pollution range at the inversion elevation of 960 m is significantly reduced.
Well sites where the in-situ leaching leakage may occur are: well sites 9467, 9468, 9471, 9466, 9569, and the like near the measuring line No. 4; well sites 9459, 9464, 9469, 9466, and the like near the measuring line No. 5; well sites 9435, 9440, 9423, 9438, and the like near the measuring line No. 6; well sites 9454, 9432, 9430, 9132, 9133, 9112, 9111, 8807, 9114, and the like near the measuring line No. 7; and well sites 9130, 9029, 9107, 9106, and the like near the 6
BL-5684
LU504248 measuring line No. 8.
FIGs. 2 and 3 show a three-dimensional geological structure of a groundwater pollution range and pollution ranges at different elevations, respectively. 7
Claims (2)
1. A method for detecting a leaching range and a groundwater pollution range after acid in-situ leaching uranium mining, wherein the method uses controlled source audio-frequency magnetotellurics to detect the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining, and specifically comprises the following steps: (a) arranging a plurality of parallel and equidistant measuring lines in a detection area by using a GPS method, and setting a plurality of equidistant measuring points on each measuring line; (b) using a scalar measurement method of controlled source audio-frequency magnetotellurics (CSAMT) detection, and arranging a transmitter at a position 7-9 km away from a detection target area; arranging a receiver at the position of the detection target area; using a dipole line source for transmission by the transmitter, and using a scalar array for receiving by the receiver; wherein a distance between the transmitter and the receiver is 7-9 km, and transmitting is performed from the same transmitting point in a measuring line; transmitting signals with different frequencies by the transmitter, receiving electric and magnetic field signals coupled to the ground by the receiver, and converting signals into acquisition data after being calibrated by a grid value; (c) sequentially performing curve smoothing, near-field correction, one-dimensional inversion, two-dimensional inversion, and electric geological comprehensive interpretation on the acquired data from the step (b) to form a geophysical inversion result and a geological interpretation map of each measuring line; (d) setting up three-dimensional geological modeling on the detection area according to the geophysical inversion result and the geological interpretation map obtained in the step (c), and performing slice display on the model at different depths; and (e) analyzing a condition of the model obtained in the step (d), and obtaining the leaching range and the groundwater pollution range after acid in-situ leaching uranium mining as well as a leakage point by combining physical property data of the detection target area.
2. The method for detecting the leaching range and the groundwater pollution range after 8
BL-5684 LU504248 acid in-situ leaching uranium mining according to claim 1, wherein 10 parallel measuring lines with an equal spacing of 50 meters are arranged in the detection area. 9
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504248A LU504248B1 (en) | 2023-05-17 | 2023-05-17 | Method for detecting leaching and groundwater pollution range after acid in-situ leaching uranium mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504248A LU504248B1 (en) | 2023-05-17 | 2023-05-17 | Method for detecting leaching and groundwater pollution range after acid in-situ leaching uranium mining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504248B1 true LU504248B1 (en) | 2023-11-30 |
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ID=88925401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504248A LU504248B1 (en) | 2023-05-17 | 2023-05-17 | Method for detecting leaching and groundwater pollution range after acid in-situ leaching uranium mining |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU504248B1 (en) |
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2023
- 2023-05-17 LU LU504248A patent/LU504248B1/en active IP Right Grant
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Effective date: 20231130 |