CN106932555B - The calculation method of the in-situ ionic rare earth leaching mine single hole fluid injection radius of influence - Google Patents
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Abstract
The present invention relates to the calculation methods of the in-situ ionic rare earth leaching mine single hole fluid injection radius of influence, are suitable for in_situ leaching fluid injection Hole pattern parameters and design.The present invention includes 7 steps, is respectively as follows: the saturated volume moisture content of (1) test ore body；(2) soil―structure interaction of ore body is tested；(3) setting single hole fluid injection influences the saturation degree on boundary, calculates the suction head value for influencing boundary；(4) the average infiltration coefficient in single hole fluid injection coverage is calculated；(5) calculate liquid injection hole bottom influences boundary at a distance from liquid injection hole week in the plane；(6) volumetric water content is calculated with the constant of radial distance variation speed；(7) radius of influence of single hole fluid injection is calculated.The present invention utilizes established model on the basis of testing Physical And Mechanical Indexes of The Typical, can calculate the radius of influence of single hole fluid injection, provides foundation for the design of in_situ leaching fluid injection Hole pattern parameters.
Description
Technical field
The present invention relates to the calculation methods of the in-situ ionic rare earth leaching mine single hole fluid injection radius of influence, are suitable for in_situ leaching
The design of fluid injection Hole pattern parameters.
Background technique
In_situ leaching is the third generation technique for extracting ion type rareearth resource, which is injected to ore body by liquid injection hole and soaked
Mine agent solution makes it that exchange reaction occur with rare earth ion, then injects supernatant to liquid injection hole, and rare earth ion enters in supernatant
Leachate is formed, leachate is flowed out from liquid collection engineering, with the rare earth ion in precipitating reagent precipitating leachate, realizes resource reclaim
Purpose (see pond you pacify etc. written by books " rare-earth mineral processing " P303, Beijing Science Press, 2014,06.).
For entire in_situ leaching technique, liquid injection hole network arrangements are one of its cores, are promoting in_situ leaching technique
More than 10 years in, engineers and technicians summarize it is a set of arrangement liquid injection hole Experiences: liquid injection hole is arranged to diamond shaped；Fluid injection
Hole depth is generally shown in that 0.5~1m of mine, fluid injection bore dia are generally 0.15~0.3m；For 15 ° of gradient <, fluid injection pitch of holes and
Array pitch is 1.0~2.0m × 1.0~2.0m；For the gradient at 15 °~30 °, fluid injection pitch of holes and array pitch be 1.5~3.0m ×
1.5~3.0m；For 30 ° of gradient >, fluid injection pitch of holes and array pitch are 2.5~3m × 2.5~3m or do not arrange (see national rare earth
" ionic type rare earth ore in-situ leaches production technique specification " paper for approval P9,2015 of technical committee for standardization (TCST) (SAC/TC229),
02.)。
Mesh arrangement it is reasonable whether will directly influence the rare earth resources rate of recovery, be mainly manifested in three aspect: (1) note
Fluid apertures spacing arrangement is excessive, and in the case where fluid injection intensity is certain, leaching mine agent cannot enter to be seeped into farther region, be easy to cause leaching
Mine blind area reduces the rare earth resources rate of recovery；(2) fluid injection pitch of holes arrangement is too small, and will increase input cost, while also be easy to make
At hole phenomenon is altered, once altering hole, leaching mine blind area range is further increased, resource recovery is reduced；(3) fluid injection pitch of holes is too
It is small, it be easy to cause fluid injection intensity bigger than normal, and then be easy to happen landslide, the resource of landslide areas is also difficult to recycle (to be added see bad million
It is published in " using the discussion of the three rate problem of weathered superficial leaching rare-earth ore mountain of in_situ leaching technique " 2010 of " rare earth " periodical,
31 (02): P86-88. and Rao Rui etc. is published in " the in-situ ionic rare earth leaching ore mining field Landslide Features and prevention and control of " rare earth " periodical
Experimental study " .2016,37 (06): P6-31).
In fact, rationally determining pitch of holes, not only to consider the gradient, should more consider permeability, the fluid injection intensity of ore body
With the influence of native water characteristic etc..
Summary of the invention
The object of the present invention is to provide a kind of calculation methods of in-situ ionic rare earth leaching mine single hole fluid injection radius of influence.
Technical solution of the present invention: a kind of calculation method of the in-situ ionic rare earth leaching mine single hole fluid injection radius of influence, packet
Include following steps:
Step 1: the saturated volume moisture content of test ore body,
Field sampling tests the density and mass water content of ore body sample, and the saturation body of ore body is calculated using relational expression (1)
Product moisture content；
Relational expression (1):
In relational expression (1): θsFor saturated volume moisture content, dsFor ore body sample particle relative density, w is ore body sample
Mass water content, ρ are the density of ore body sample, ρwFor the density of water；
Step 2: the soil―structure interaction of test ore body,
Using the corresponding matric suction of prior art test ore body different volumes moisture content, it is fitted and is surveyed by relational expression (2)
Data are tried, determine fitting parameter；
Relational expression (2):
In relational expression (2): θ is volumetric water content, θsFor saturated volume moisture content, θrFor residual volume moisture content, λ, m, n
For fitting parameter, ψ is matric suction, unit kPa；
Step 3: setting single hole fluid injection influences the saturation degree on boundary, the suction head value for influencing boundary is calculated,
The suction head value for influencing boundary is calculated using relational expression (3)；
Relational expression (3):
In relational expression (3): hfFor the suction head value for influencing boundary, ρwFor the density of water, g is acceleration of gravity, and ψ is base
Matter suction, unit kPa, ψbTo influence borderline matric suction, unit kPa, ksFor saturation permeability coefficient, k is unsaturation
Infiltration coefficient；Unsaturated Hydraulic Conductivity k is calculated using relational expression (4)；
Relational expression (4):
In relational expression (4): k is Unsaturated Hydraulic Conductivity, ksFor saturation permeability coefficient, m is fitting parameter, and S is soil body phase
To saturation degree；Soil body relative saturation degree S is calculated using relational expression (5)；
Relational expression (5):
In relational expression (5): S is soil body relative saturation degree, and θ is volumetric water content, θsFor saturated volume moisture content, θrIt is residual
Remaining volumetric water content, ψ are matric suction, and unit kPa, λ, m, n are fitting parameter, and m=1-1/n；
Step 4: the average infiltration coefficient in single hole fluid injection coverage is calculated,
Unsaturated Hydraulic Conductivity can be obtained by relational expression (4), calculated using relational expression (6) flat in single hole fluid injection coverage
Equal infiltration coefficient；
Relational expression (6):
In relational expression (6): kdFor the average infiltration coefficient in single hole fluid injection coverage, k is Unsaturated Hydraulic Conductivity, θ
For volumetric water content, θsFor saturated volume moisture content, θ1To influence borderline volumetric water content；
Step 5: calculate liquid injection hole bottom influences boundary at a distance from liquid injection hole week in the plane,
Calculate liquid injection hole bottom using relational expression (7) influences boundary at a distance from liquid injection hole week in the plane；
Relational expression (7):
In relational expression (7): a influences boundary at a distance from liquid injection hole week for liquid injection hole bottom in the plane, θ1To influence side
Volumetric water content in boundary, θsFor saturated volume moisture content, θiFor initial volume moisture content, β is reflection moisture content with radial distance
Change the constant of speed；
Step 6: the constant that volumetric water content changes speed with radial distance is calculated,
Will relational expression (3), relational expression (6), relational expression (7) substitute into relational expression (8) in can calculate moisture content with radial direction away from
Constant from variation speed；
Relational expression (8):
In relational expression (8): β is to reflect moisture content with the constant of radial distance variation speed, kdModel is influenced for single hole fluid injection
Enclose interior average infiltration coefficient, hfFor the suction head value for influencing boundary, a influences boundary and note for liquid injection hole bottom in the plane
The distance in fluid apertures week, r0For fluid injection pore radius, it is downwards positive direction that z, which is the coordinate of liquid injection hole depth direction, and c is in liquid injection hole
Depth of accumulated water, r are radial coordinate, and k is Unsaturated Hydraulic Conductivity；
Step 7: the radius of influence of single hole fluid injection is calculated,
The parameter beta in corresponding aperture under depth of accumulated water can be solved according to relational expression (8), can be calculated with relational expression (7)
A, thus the radius of influence of single hole fluid injection can be described by relational expression (9)；
Relational expression (9):
R=a+r0(9),
In relational expression (9): R is the radius of influence of single hole fluid injection, and a influences boundary and fluid injection for liquid injection hole bottom in the plane
The distance in hole week, r0For fluid injection pore radius.
The present invention has comprehensively considered the various factors that single hole fluid injection coverage is influenced when in_situ leaching fluid injection, with seepage flow
Theory proposes in-situ ionic rare earth leaching on the basis of the Infiltration Law that system research ore leachate is infiltrated by liquid injection hole
The calculation method of the mine single hole fluid injection radius of influence determines that fluid injection pitch of holes provides foundation to be reasonable.In_situ leaching technical specification
In require in liquid injection hole the depth of accumulated water to be 0.5~1.0m, be to influence boundary with saturation degree 80% in the hole within the scope of depth of accumulated water
Determine the single hole fluid injection radius of influence, error is respectively less than 20%, meets engine request.
Specific embodiment
The present invention proposes the calculating side of the single hole fluid injection radius of influence on the basis of system research single hole water infiltration process
Method.
With the application of the invention, the influence half of underground test Jiangxi Longnan foot hole rare-earth mining area in_situ leaching single hole fluid injection
Diameter is described in detail below:
Step 1: the saturated volume moisture content of test ore body,
With cutting ring field sampling 8, the averag density for measuring ore body sample is 1630kg/m3, average quality water content is
15.32%, use relational expression (1) to calculate the saturated volume moisture content of ore body as 47.92%；
Relational expression (1):
In relational expression (1): θsFor saturated volume moisture content, dsFor ore body sample particle relative density, w is ore body sample
Mass water content, ρ are the density of ore body sample, ρwFor the density of water；
Step 2: the soil―structure interaction of test ore body,
The corresponding matrix of TEN type tensometer test ore body different volumes moisture content developed using Chinese Academy of Sciences's Nanjing soil
Suction is fitted test data by relational expression (2), and obtaining residual volume moisture content is 9.00%, λ=12.30, n=1.97, m
=0.49；
Relational expression (2):
In relational expression (2): θ is volumetric water content, θsFor saturated volume moisture content, θrFor residual volume moisture content, λ, m, n
For fitting parameter, ψ is matric suction, unit kPa；
Step 3: set single hole fluid injection influence boundary saturation degree be 80%, calculate saturation degree for 80% influence boundary
On suction head value,
It uses monocycle method to measure the saturation permeability coefficient of liquid injection hole region as 1.08m/d, can be counted using relational expression (3)
Calculating saturation degree is the 80% borderline suction head value h of influencef=0.44m；
Relational expression (3):
In relational expression (3): hfIt is the borderline suction head value of 80% influence, ρ for saturation degreewFor the density of water, g attaches most importance to
Power acceleration, ψ are matric suction, unit kPa, ψbIt is the borderline matric suction of 80% influence for saturation degree, unit is
KPa, ksFor saturation permeability coefficient, k is Unsaturated Hydraulic Conductivity；Unsaturated Hydraulic Conductivity k is calculated using relational expression (4)；
Relational expression (4):
In relational expression (4): k is Unsaturated Hydraulic Conductivity, ksFor saturation permeability coefficient, m is fitting parameter, and S is soil body phase
To saturation degree；Soil body relative saturation degree S can be calculated using relational expression (5)；
Relational expression (5):
In relational expression (5): S is soil body relative saturation degree, and θ is volumetric water content, θsFor saturated volume moisture content, θrIt is residual
Remaining volumetric water content, ψ are matric suction, and unit kPa, λ, m, n are fitting parameter, and m=1-1/n；
Step 4: the average infiltration coefficient in single hole fluid injection coverage is calculated,
By relational expression (1) calculate saturated volume moisture content be 47.92%, thus calculate saturation degree be 80% influence side
Volumetric water content in boundary is 38.34%, can obtain Unsaturated Hydraulic Conductivity by relational expression (4), calculates single hole using relational expression (6)
Average osmotic coefficient k in fluid injection coveraged=0.33m/d；
Relational expression (6):
In relational expression (6): kdFor the average infiltration coefficient in single hole fluid injection coverage, k is Unsaturated Hydraulic Conductivity, θ
For volumetric water content, θsFor saturated volume moisture content, θ1It is the borderline volumetric water content of 80% influence for saturation degree；
Step 5: calculate liquid injection hole bottom institute saturation degree is 80% in the plane influence boundary and liquid injection hole it is all at a distance from,
It uses conventional method to measure soil initial volume moisture content as 24.20%, saturated volume is obtained by relational expression (1) and is contained
Water rate is 47.92%, thus calculate saturation degree be the borderline volumetric water content of 80% influence is 38.34%, using relationship
Formula (7) can calculate liquid injection hole bottom saturation degree is 80% in the plane influences boundary and liquid injection hole it is all at a distance from；
Relational expression (7):
In relational expression (7): a be liquid injection hole bottom in the plane saturation degree be 80% influence boundary and liquid injection hole week away from
From θ1It is the borderline volumetric water content of 80% influence, θ for saturation degreesFor saturated volume moisture content, θiIt is aqueous for initial volume
Rate, β are to reflect moisture content with the constant of radial distance variation speed；
Step 6: the constant that volumetric water content changes speed with radial distance is calculated,
Will relational expression (3), relational expression (6), relational expression (7) substitute into relational expression (8) in can calculate moisture content with radial direction away from
Constant from variation speed；
Relational expression (8):
In relational expression (8): β is to reflect moisture content with the constant of radial distance variation speed, kdModel is influenced for single hole fluid injection
Enclose interior average infiltration coefficient, hfIt is the borderline suction head value of 80% influence for saturation degree, a is plane where liquid injection hole bottom
The influence boundary that upper saturation degree is 80% is at a distance from liquid injection hole week, r0For fluid injection pore radius, z is the seat of liquid injection hole depth direction
Mark, is downwards positive direction, and c is depth of accumulated water in liquid injection hole, and r is radial coordinate, and k is Unsaturated Hydraulic Conductivity；
Depth of accumulated water c in live single hole fluid injection experimental test liquid injection hole；
A smooth location is selected in rare-earth mining area, 5 liquid injection holes are bored using Luoyang Spade, hole depth 2.5m, aperture is
0.18m, the interior pvc pipe for placing Ф 50mm of each liquid injection hole are inserted to bottom hole, are filled, prevented with faggot between pvc pipe and fluid injection hole wall
Only hole wall collapses, and pvc pipe lower semisection uniformly opens some apertures, so that water is flowed out from pvc pipe.By the supernatant warp in feed coefficient
The PVC of 1 Ф 20mm is responsible for the continuous fluid injection into liquid injection hole, installs one respectively on the branch's pvc pipe for connecting 5 liquid injection holes
Tap and a water meter, controlling the fluid injection intensity of 5 liquid injection holes by tap and water meter is respectively 3m3/d、2.4m3/d、
1.8m3/d、1.2m3/d、0.6m3/ d, when reaching steady infiltration, using corresponding ponding in digital display fluid level transmitter test liquid injection hole
Depth c is respectively 1.47m, 1.13m, 0.95m, 0.69m, 0.32m；
Step 7: the radius of influence of single hole fluid injection is calculated,
The parameter beta in corresponding aperture under depth of accumulated water can be solved according to relational expression (8), can be calculated with relational expression (7)
A, thus the radius of influence of single hole fluid injection can be described by relational expression (9)；
Relational expression (9):
R=a+r0(9),
In relational expression (9): R is the radius of influence of single hole fluid injection, the shadow that plane saturation degree where a is liquid injection hole bottom is 80%
Boundary is rung at a distance from liquid injection hole week, r0For fluid injection pore radius.
Experiment effect:
It selects a smooth location to carry out underground single hole fluid injection test in Longnan foot hole rare-earth mining area, is bored using Luoyang Spade
Radius is 0.09m, depth is 2.5m liquid injection hole 5, apart from each liquid injection hole 0.5m, 1.0m, 1.5m, 2.0m, 2.5m, 3.0m
Locate 1 hole of each brill, embedding model FDS-100 moisture transducer 50 altogether, 6 holes are different in injection process ore body for recording
The variation of volumetric water content at position, liquid injection hole under 5 kinds of fluid injection intensity when testing single hole fluid injection using digital display fluid level transmitter
Inner product water depth, when single hole fluid injection reaches steady infiltration, the calculated value of experimental test value and model of the present invention under 5 kinds of fluid injection intensity is such as
Shown in table 1.As seen from Table 1, except liquid level be 0.32m when the calculated hole week permeability model of model it is bigger than normal in addition to, remaining fluid
The error of face height drag calculated result and site test results considers that in_situ leaching technology is advised within 25%
The fluid injection hole depth proposed in model is to see 0.5~1.0m of mine, that is, requiring depth of accumulated water in liquid injection hole is 0.5~1.0m, the Kong Zhongji
Within the scope of water depth, error is respectively less than 20%, it can be considered that meeting engine request, illustrates that the present invention can be calculated with Reasonable
The radius of influence of single hole fluid injection.
Table 1
。
Claims (2)
1. a kind of calculation method of the in-situ ionic rare earth leaching mine single hole fluid injection radius of influence, comprising the following steps:
Step 1: the saturated volume moisture content of test ore body,
Field sampling tests the density and mass water content of ore body sample, is contained using the saturated volume that relational expression (1) calculates ore body
Water rate；
Relational expression (1):
In relational expression (1): θsFor saturated volume moisture content, dsFor ore body sample particle relative density, w is the quality of ore body sample
Water content, ρ are the density of ore body sample, ρwFor the density of water；
Step 2: the soil―structure interaction of test ore body,
Using the corresponding matric suction of prior art test ore body different volumes moisture content, test number is fitted by relational expression (2)
According to determining fitting parameter；
Relational expression (2):
In relational expression (2): θ is volumetric water content, θsFor saturated volume moisture content, θrFor residual volume moisture content, λ, m, n are quasi-
Parameter is closed, ψ is matric suction, unit kPa；
Step 3: setting single hole fluid injection influences the saturation degree on boundary, the suction head value for influencing boundary is calculated,
The suction head value for influencing boundary is calculated using relational expression (3)；
Relational expression (3):
In relational expression (3): hfFor the suction head value for influencing boundary, ρwFor the density of water, g is acceleration of gravity, and ψ is matrix suction
Power, unit kPa, ψbTo influence borderline matric suction, unit kPa, ksFor saturation permeability coefficient, k is unsaturation infiltration
Coefficient；Unsaturated Hydraulic Conductivity k is calculated using relational expression (4)；
Relational expression (4):
In relational expression (4): k is Unsaturated Hydraulic Conductivity, ksFor saturation permeability coefficient, m is fitting parameter, and S is soil body relative saturation
Degree；Soil body relative saturation degree S is calculated using relational expression (5)；
Relational expression (5):
In relational expression (5): S is soil body relative saturation degree, and θ is volumetric water content, θsFor saturated volume moisture content, θrFor restite
Product moisture content, ψ is matric suction, and unit kPa, λ, m, n are fitting parameter, and m=1-1/n；
Step 4: the average infiltration coefficient in single hole fluid injection coverage is calculated,
Unsaturated Hydraulic Conductivity can be obtained by relational expression (4), calculate the average infiltration in single hole fluid injection coverage using relational expression (6)
Saturating coefficient；
Relational expression (6):
In relational expression (6): kdFor the average infiltration coefficient in single hole fluid injection coverage, k is Unsaturated Hydraulic Conductivity, and θ is volume
Moisture content, θsFor saturated volume moisture content, θ1To influence borderline volumetric water content；
Step 5: calculate liquid injection hole bottom influences boundary at a distance from liquid injection hole week in the plane,
Calculate liquid injection hole bottom using relational expression (7) influences boundary at a distance from liquid injection hole week in the plane；
Relational expression (7):
In relational expression (7): a influences boundary at a distance from liquid injection hole week for liquid injection hole bottom in the plane, θ1It is borderline to influence
Volumetric water content, θsFor saturated volume moisture content, θiFor initial volume moisture content, β is that reflection moisture content changes fastly with radial distance
Slow constant；
Step 6: the constant that volumetric water content changes speed with radial distance is calculated,
Relational expression (3), relational expression (6), relational expression (7), which are substituted into, can calculate moisture content in relational expression (8) becomes with radial distance
Change the constant of speed；
Relational expression (8):
In relational expression (8): β is to reflect moisture content with the constant of radial distance variation speed, kdFor in single hole fluid injection coverage
Average infiltration coefficient, hfFor the suction head value for influencing boundary, a influences boundary and liquid injection hole week for liquid injection hole bottom in the plane
Distance, r0For fluid injection pore radius, it is downwards positive direction that z, which is the coordinate of liquid injection hole depth direction, and c is that ponding is deep in liquid injection hole
Degree, r is radial coordinate, and k is Unsaturated Hydraulic Conductivity；
Step 7: the radius of influence of single hole fluid injection is calculated,
The parameter beta in corresponding aperture under depth of accumulated water can be solved according to relational expression (8), a can be calculated with relational expression (7), by
The radius of influence of this single hole fluid injection can be described by relational expression (9)；
Relational expression (9):
R=a+r0(9),
In relational expression (9): R is the radius of influence of single hole fluid injection, and a influences boundary and liquid injection hole week for liquid injection hole bottom in the plane
Distance, r0For fluid injection pore radius.
2. a kind of calculation method of in-situ ionic rare earth leaching mine single hole fluid injection radius of influence according to claim 1,
Be characterized in: depth of accumulated water c is determined by following methods in liquid injection hole: being selected a smooth location in rare-earth mining area, is bored 5 using Luoyang Spade
A liquid injection hole, hole depth 2.5m, aperture 0.18m, the pvc pipe that Ф 50mm is placed in each liquid injection hole are inserted to bottom hole, pvc pipe with
It is filled between fluid injection hole wall with faggot, prevents hole wall from collapsing, pvc pipe lower semisection is uniformly provided with aperture, so that water is flowed from pvc pipe
Out；Supernatant in feed coefficient is responsible for the continuous fluid injection into liquid injection hole through the PVC of 1 Ф 20mm, in 5 liquid injection holes of connection
One tap and a water meter are installed respectively, the fluid injection for controlling 5 liquid injection holes by tap and water meter is strong on branch's pvc pipe
Degree, when reaching steady infiltration, using corresponding depth of accumulated water c in digital display fluid level transmitter test liquid injection hole.
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| CN107858537B (en) * | 2017-12-04 | 2019-07-26 | 江西理工大学应用科学学院 | Ion type rareearth naked foot formula mine in_situ leaching Hole pattern parameters design method |
| CN107858536B (en) * | 2017-12-04 | 2019-07-26 | 江西理工大学应用科学学院 | Ion type rareearth full-covering type mine in_situ leaching Hole pattern parameters design method |
| CN108303512B (en) * | 2018-01-07 | 2020-06-19 | 江西理工大学 | Method for in-situ testing soil-water characteristic curve |
| CN108427836A (en) * | 2018-03-02 | 2018-08-21 | 江西理工大学 | A kind of assay method for determining ion type rareearth individual well fluid injection coverage under head condition |
| CN108614910A (en) * | 2018-03-06 | 2018-10-02 | 江西理工大学 | The computational methods of ion type rareearth mine in_situ leaching critical groundwater table |
| CN110658123A (en) * | 2019-09-23 | 2020-01-07 | 南京大学 | In-situ test method for unsaturated soil permeability coefficient based on optical fiber active temperature change |
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