CN108426803A - A kind of assay method of ion type rareearth One-dimensional Vertical Infiltration rule - Google Patents
A kind of assay method of ion type rareearth One-dimensional Vertical Infiltration rule Download PDFInfo
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- CN108426803A CN108426803A CN201810175720.XA CN201810175720A CN108426803A CN 108426803 A CN108426803 A CN 108426803A CN 201810175720 A CN201810175720 A CN 201810175720A CN 108426803 A CN108426803 A CN 108426803A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B59/00—Obtaining rare earth metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to in-situ ionic rare earths to soak mine technical field, disclose a kind of assay method of ion type rareearth One-dimensional Vertical Infiltration rule, pass through the one-dimensional permeability intensity of ion type rareearth, study clear water and the ore leachate Infiltration Law in ion type rareearth, inquire into the hydrodynamic parameters such as matric suction, saturated hydraulic conductivity, disclosing rare earth with modified Green Ampt models infiltrates mechanism.Ore leachate infiltrates power and its infiltration time and space idea etc. when being conducive to explore ion type rareearth mine original in-situ leach mining, it is also beneficial to improve in-situ ionic rare earth to night sweat the theoretical system of excavating technology, for engineering actual arrangement fluid injection well pattern and determines that fluid injection speed provides theoretical foundation.The result shows that the wetting front rate Green Ampt improved models calculated values of ion type rareearth ore leachate One-dimensional Vertical Infiltration and experiment measured value coincide preferably, computational accuracy significantly improves, and improved model can effectively verify ion type rareearth One-dimensional Vertical Infiltration rate.
Description
Technical field
The invention belongs to in-situ ionic rare earth leaching mine technical fields more particularly to a kind of ion type rareearth One-dimensional Vertical to enter
Ooze the assay method of rule.
Background technology
Currently, the prior art commonly used in the trade is such：The distinctive ion type rareearth ore of south China is glutinous to be adsorbed on
Ionic state preservation on soil mostly uses original place and night sweats excavating technology at present.Original place leaching need not remove table soil and excavate ore body, directly
In massif surface layout fluid injection well pattern, ammonium sulfate leaching agent is injected, exchange reaction leaching is occurred by ammonium ion and rare earth ion
Go out.High-efficiency mining need to meet two conditions：First, ore leachate should be able to be dipped into the rare earth layer of all quasi- production zones, referred to as " leaching
Obtain ", second is that mother liquor, which should be able to all flow out massif, is pooled to mother liquor pond, referred to as " stream obtains ".Ore leachate infiltrates feelings in rare earth
Condition directly affects the utilization rate and the rate of recovery of rare earth resources.Rainfall infiltration, stability of slope, field irrigation, pollutant are in the soil body
The engineering problems such as migration with infiltrate it is related.Classical Infiltration Model mainly have Green-Ampt models, Horton models and
Philip models etc., in order to be applicable in different operating modes, many scholars are for different ponding conditions, different soil property and soil layer conditions and not
It is infiltrated with orographic condition and has carried out experimental study and scale-model investigation, but in-situ ionic rare earth leaching Infiltration Law and model are ground
Study carefully less, it is that a technique walks technology before theory to be primarily due to in-situ ionic rare earth leaching mine technology.So as to cause
In practical recovery process, fluid injection well pattern parameter and fluid injection intensity is empirically determined more, causes the resource leaching rate of recovery uncertain
Property it is very big, for some up to 80%, some is even less than 10%, and landslide is serious.If can establish applicability it is higher enter
The problem of osmole type can answer " rare earth where go " by calculating, " ore leachate where flow to ", improves rare earth resources and returns
Yield.
In conclusion problem of the existing technology is：
(1) spacing and the distribution for how determining fluid injection well pattern, a large amount of leaching mine blind area, distribution can then be formed by being distributed to dredge
It is overstocked, the geological disasters such as a large amount of ore leachate pollutions and landslide can be formed.
(2) Infiltration Model that most of soil has its applicable, the seepage parameters difference that different Infiltration Models calculates
It is larger, it is essence how using Infiltration Law and Infiltration Model prediction and the flow process for regulating and controlling ore leachate in in_situ leaching in due course
Standard melts the important prerequisite for adopting rare earth resources.
(3) the fluid injection well of original place leaching has certain water filling height, that is, there is certain head pressure, be different from agricultural irrigation
When Infiltration from Point Sources, be more different from atmospheric precipitation and infiltrate, consider the Infiltration Model of head be improve ion type rareearth Infiltration Model
An important factor for applicability.
Solve the difficulty and meaning of above-mentioned technical problem：In_situ leaching technique has ion type rareearth exploitation good
Applicability can preferably solve the problems, such as that environment is seriously polluted in rare earth resources recovery process, but the resource of the technique at present
Extraction rate is uncertain big, and the solution in flow event flows to unintelligible.Carry out the survey of ion type rareearth One-dimensional Vertical Infiltration rule
The research for determining method is beneficial to the flow process of ore leachate in prediction and in due course regulation and control in_situ leaching, further promotes original place
Deposit impregnating technology it is scientific.
Invention content
In view of the problems of the existing technology, the present invention provides a kind of surveys of ion type rareearth One-dimensional Vertical Infiltration rule
Determine method.
The invention is realized in this way a kind of improved Green-Ampt models, the improved Green-Ampt models
Wetting front before instantaneous migration velocity and the relationship with wetting front depth：
Wherein：
Wherein：I is infiltration rate；ksFor saturated hydraulic conductivity in soil；Z is wetting front depth；sfFor wetting front be averaged matrix inhale
Power；The moisture content of dry ground layer is initial aqueous rate θi；The moisture content of zone of saturation is saturated aqueous rate θs；zwFor transition region thickness.
Another object of the present invention is to provide a kind of ion type rareearths using the improved Green-Ampt models
The assay method of the assay method of One-dimensional Vertical Infiltration rule, the ion type rareearth One-dimensional Vertical Infiltration rule includes：
Step 1, permeability intensity device are made of earth pillar, pressure-measuring pipe, Markov bottle water-feed and weighing equipment etc., Zhu Guanwei
The lucite tube of outer diameter 50mm, length 2000mm, vertical pressure measurement pipe outside diameter 20mm, and graduated scale is posted, precision 1mm；It surveys
Pressure pipe and supervisor coupling part are blocked with gauze；A diameter of 40mm of earth pillar, high 1890mm are tested, constant water head height is 60mm；
When loading earth pillar, it is embedded to TDR probe monitors water-cut variations；Supervisor top is equipped with overflow pipe, and end is equipped with soakaway trench and graduated cylinder,
Measure accumulation amount of precipitation；
Step 2, rare earth sample are derived from south jiangxi Xunwu County Rare-earth Mine, place several days indoors, and weathering is completed；Examination
Before testing, the larger mine soil of lumpiness is simply rolled, then carries out the grain composition that sieve test measures rare earth sample.
Further, the assay method of the ion type rareearth One-dimensional Vertical Infiltration rule is moistened with time increase is infiltrated
Cutting edge of a knife or a sword is accumulative to be infiltrated depth and increases, and the rare earth wetting front migration rule of different-grain diameter grading is essentially identical, first rapid growth, after
It tends towards stability.
Wetting front migration rate changing rule, 3% ammonium sulfate enter to be seeped into the migration of the wetting front in different-grain diameter rare earth
Rate changes with time, and trend is identical, and quickly reduction first, then slowly development, finally tends to a stationary value；
Infiltration rate changing rule has very high infiltration rate at the initial stage of infiltrating, over time, the infiltrating performance of rare earth
It is rapid to decline, finally tend towards stability；
Saturation permeability coefficient, the rising rule of head is roughly the same in pressure-measuring pipe, initial stage rapid increase, with infiltrating the time
Growth, the rate of rising is gradually reduced, and until piezometric head height is close to certain fixed value, tends towards stability.
Another object of the present invention is to provide a kind of improved Green-Ampt models in in-situ ionic rare earth
Soak the application in mine.
In conclusion advantages of the present invention and good effect are：By the one-dimensional permeability intensity of ion type rareearth, clear water is studied
With ore leachate in ion type rareearth Infiltration Law, inquire into the hydrodynamic parameters such as matric suction, saturated hydraulic conductivity, use is modified
Green-Ampt models disclose rare earth and infiltrate mechanism.Ore leachate enters when being conducive to explore ion type rareearth mine original in-situ leach mining
Power and its infiltration time and space idea etc. are oozed, is also beneficial to improve in-situ ionic rare earth and night sweats the theoretical system of excavating technology, be work
Journey actual arrangement fluid injection well pattern and determining fluid injection speed provide theoretical foundation.
The wetting front that clear water and 3% ammonium sulfate infiltrate in ion type rareearth of the present invention infiltrates depth and changes with time
Trend is essentially identical.With the increase for infiltrating the time, wetting front accumulation, which is infiltrated depth and presented, first quickly to be increased, and is slowly developed afterwards
Trend.Wetting front migration rate value is in first quickly reduction, the trend slowly developed afterwards.There is very high infiltration rate at the initial stage of infiltrating,
Over time, infiltrating performance declines rapidly, finally tends towards stability.According to actual conditions, will enter cementation of rare-earth layer be divided into it is full
With layer, transition zone and dry ground layer, Green-Ampt models are improved on the basis of being assumed based on layering, in conjunction with laboratory test
As a result improved Green-Ampt models are verified, the results showed that, ion type rareearth ore leachate One-dimensional Vertical Infiltration
Wetting front rate Green-Ampt improved models calculated value and experiment measured value coincide preferable, computational accuracy significantly improves, and changes
Ion type rareearth One-dimensional Vertical Infiltration rate can be effectively verified into model.
Description of the drawings
Fig. 1 is the assay method flow chart of ion type rareearth One-dimensional Vertical Infiltration rule provided in an embodiment of the present invention.
Fig. 2 is permeability intensity schematic device provided in an embodiment of the present invention.
Fig. 3 is provided in an embodiment of the present invention accumulative to infiltrate depth and the relation schematic diagram of time；
In figure：(a) grain size 0.3mm；(b) grain size 0.6mm；(c) grain size 1.18mm；(d) grain size 2.36mm.
Fig. 4 is the relation schematic diagram of wetting front migration rate and time provided in an embodiment of the present invention.
Fig. 5 is the relation schematic diagram of infiltration rate provided in an embodiment of the present invention and time.
Fig. 6 is pressure-measuring pipe lifting height provided in an embodiment of the present invention and time relationship schematic diagram.
Fig. 7 is precipitation water provided in an embodiment of the present invention and time relationship schematic diagram.
Fig. 8 is improved model schematic diagram provided in an embodiment of the present invention.
Fig. 9 is wetting front rate comparison schematic diagram provided in an embodiment of the present invention；
In figure：A) sample 1；(b) sample 2.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Ore leachate infiltrates the high-efficiency mining for directly affecting rare earth resources and utilization in in-situ ionic rare earth deposit impregnating technology.Base
Ion type rareearth One-dimensional Vertical Infiltration experiment is carried out in self-control experimental rig, leaching solution chooses clear water and 3% ammonium sulfate respectively
Solution, the accumulation for having studied 4 kinds of different-grain diameter rare earths infiltrate depth, wetting front migration rate, infiltration rate etc. and change over time rule
Rule.Incorporation engineering is practical, the problem of excessively simplifying for traditional Green-Ampt model hypothesis and influence computational accuracy, will infiltrate
Rare earth layer is divided into zone of saturation, transition zone and dry ground layer, is improved Green-Ampt models on the basis of being layered hypothesis, and
Improved model is verified in conjunction with laboratory test results.The result shows that wetting front migration rate Green-Ampt changes
It coincide into model calculation value and experiment measured value preferable, computational accuracy significantly improves, can effectively simulation ion type rareearth leaching
Mine liquid One-dimensional Vertical Infiltration process.
As shown in Figure 1, the assay method of ion type rareearth One-dimensional Vertical Infiltration rule provided in an embodiment of the present invention includes
Following steps：
S101：Permeability intensity device is made of earth pillar, pressure-measuring pipe, Markov bottle water-feed and weighing equipment etc., and it is outer to be responsible for
The lucite tube of diameter 50mm, length 2000mm, vertical pressure measurement pipe outside diameter 20mm, and graduated scale is posted, precision 1mm；Pressure measurement
Pipe and supervisor coupling part are blocked with gauze, prevent soil sample from entering；Test a diameter of 40mm of earth pillar, high 1890mm, constant water
Head height is 60mm；When loading earth pillar, it is embedded to TDR probe monitors water-cut variations；Supervisor top is equipped with overflow pipe, and end, which is equipped with, oozes
Water pipe and graduated cylinder can measure accumulation amount of precipitation；
S102：Rare earth sample is derived from south jiangxi Xunwu County Rare-earth Mine, places several days indoors, and weathering is completed.Experiment
Before, the larger mine soil of lumpiness is simply rolled, the grain composition that sieve test measures rare earth sample is then carried out.
The application principle of the present invention is further described with reference to experiment.
1 permeability intensity and analysis
1.1 experimental rig
Permeability intensity device is made of earth pillar, pressure-measuring pipe, Markov bottle water-feed and weighing equipment etc., as shown in Figure 2.Supervisor
For the lucite tube of outer diameter 50mm, length 2000mm, vertical pressure measurement pipe outside diameter 20mm, and graduated scale is posted, precision 1mm；
Pressure-measuring pipe and supervisor coupling part are blocked with gauze, prevent soil sample from entering；A diameter of 40mm, the high 1890mm of earth pillar are tested, it is permanent
Determine a height of 60mm of head；When loading earth pillar, it is embedded to TDR probe monitors water-cut variations；Supervisor top is equipped with overflow pipe, and end is set
There are soakaway trench and graduated cylinder, accumulation amount of precipitation can be measured.
1.2 sample
Rare earth sample is derived from south jiangxi Xunwu County Rare-earth Mine, places several days indoors, and weathering is completed.It, will before experiment
The larger mine soil of lumpiness is simply rolled, and the grain composition that sieve test measures rare earth sample is then carried out.The basic object of soil sample
Reason characteristic is shown in Table 1.
1 soil sample basic physical parameters of table
Change in depth rule is infiltrated in 1.3 accumulations
Fig. 3 is to infiltrate depth and the relationship of time into the wetting front that sepage is clear water and 3% ammonium sulfate is accumulative.With
Infiltrate time increase, wetting front is accumulative to be infiltrated depth and increase, and the rare earth wetting front migration rule of different-grain diameter grading is basic
It is identical, first rapid growth, after tend towards stability.To off-test since infiltrating, enter sepage be 3% ammonium sulfate add up into
Depth curve is oozed to infiltrate above depth curve in the accumulative of clear water always, because infiltrating the potential energy that power is derived mainly from water in soil,
3% ammonium sulfate gravitational potential and pressure potential effect are larger, solute potential influence very little, therefore its soil water potential bigger.At the initial stage of infiltrating,
With the part soil being in direct contact around head, moisture content increases rapidly, and the soil body is rapidly achieved saturation, and gas is few, helps to moisten
The migration of cutting edge of a knife or a sword, higher in moisture content, there are continuous capillary waters in rare earth, cause the quick migration of wetting front.
It infiltrates to the middle and later periods, wetting front migration rate quickly slows down, this is because wetting front leading portion is with stronger in infiltration process
Imposing manner pressure, inhibition is caused to the migration of wetting front, until being elapsed with stable rate.In infiltration process, to wetting front
What migration played a leading role is earth pressure head height, and grain size has certain influence to the migration of wetting front, and grain size is bigger, to water
Partite transport shifting has progradation, the instantaneous migration rate of wetting front bigger.
1.4 wetting front migration rate changing rules
3% ammonium sulfate enters to be seeped into the wetting front migration rate in different-grain diameter rare earth and changes with time trend phase
Together, quickly reduce first, then slowly development, finally tends to a stationary value, Fig. 4 be sample 1 wetting front migration rate with
Infiltrate the relational graph of time.
1.5 infiltration rate changing rules
According to infiltration process wetting front distance and water-cut variation, infiltration rate can be acquired, Fig. 5 is that the infiltration rate of sample 1 becomes
Law.It can be seen that：There is very high infiltration rate at the initial stage of infiltrating, over time, under the infiltrating performance of rare earth is rapid
Drop, finally tends towards stability.
1.6 saturation permeability coefficient
One-dimensional Vertical Infiltration experiment of 3% ammonium sulfate in rare earth earth pillar is carried out, 4 groups of experiments have in pressure-measuring pipe
Head occurs, and records piezometric head height and time and water and time is precipitated in supervisor's bottom soakaway trench.On 1 pressure-measuring pipe of sample
Rise and the relation curve of time are as shown in Figure 6；The accumulative precipitation water of 4 groups of samples and the relation curve of time are as shown in Figure 7.
It will be appreciated from fig. 6 that the rising rule of head is roughly the same in pressure-measuring pipe, initial stage rapid increase, with infiltrating the time
Increase, the rate of rising is gradually reduced, and until piezometric head height is close to certain fixed value, tends towards stability.As shown in Figure 7, main
The accumulative amount of precipitation of bottom of the tube is in a linear relationship at any time, this is because earth pillar has had completely passed into saturation state, is formed steady
Caused by constant current.
According to Darcy's law, obtaining flow equation is：
Wherein：Q is seepage discharge, ksFor saturation permeability coefficient, A is the cross-sectional area of earth pillar, and h is head difference, and L is that seepage paths is long
Degree, t are to infiltrate the time.
Saturation permeability coefficient k can be obtained by formula (1)sAs shown in table 3.
3 saturation permeability coefficient value of table
2 Green-Ampt model refinements and verification
2.1 model refinement
According to Green-Ampt models, can obtain
Wherein：I is infiltration rate；ksFor saturated hydraulic conductivity in soil；Z is wetting front depth；sfFor wetting front be averaged matrix inhale
Power；h0For ordinary water grease head highness.
Assuming that i=c+dx (3)
Wherein：C=ks (4)
In formula：C, d is fitting parameter；X=1/z.
Soil sample saturated hydraulic conductivity and the matric suction when infiltrating can be fitted according to (3), (4) and (5).
If the moisture content of dry ground layer is initial aqueous rate θi.The moisture content of zone of saturation is saturated aqueous rate θs；Then add up to infiltrate
Amount is：
I=(θs-θi)×z (6)
To cumulative infiltration derivation, can obtain：
According to the inverse and cumulative infiltration relationship of infiltration rate, it can be deduced that the instantaneous migration velocity of wetting front is with wetting front depth
The functional relation of degree is：
It is dry ground area before Green-Ampt Infiltration Models hypothesis wetting front, wettable layer is saturation region behind wetting front, with
It actually infiltrates and does not meet, it is assumed that infiltration process wettable layer of the water in soil layer includes zone of saturation and transition zone, as shown in figure 8, zs
To be saturated layer thickness, zwFor transition region thickness.If transition zone moisture content is θ (z), value is between initial aqueous rate θiContain with saturation
Water rate θsBetween.
Transition zone volumetric water content changes in elliptic curve in experiment, aqueous by transition zone by transition zone length decile
Rate calculates average value, obtains transition zone moisture content with the relationship of wetting front length：
The θ of θ (z)=0.78s+0.22θi (9)
It is assumed that the unsaturated hydraulic conductivity of transition zone and the size of its moisture content are proportional, according to the moisture content of zone of saturation and satisfy
And hydraulic conductivity, it can be deduced that the unsaturated hydraulic conductivity of transition zone, relationship are as follows：
Wherein：
According to above-mentioned layering it is assumed that the infiltration capacity I of zone of saturation and transition zone in infiltration process can be obtained respectivelysAnd Iw,
Value is：
Is=(θs-θi)zs (11)
By unsaturation Darcy's law, obtain：
According to Darcy's law and principle of water balance, the water that certain time period enters transition zone is：
In formula：iwFor transition zone infiltration rate.
Formula (12), (13) are substituted into formula (14) and obtain before wetting front instantaneous migration velocity and with the relationship of wetting front depth：
Wherein：
2.2 models are verified
Correction model result of calculation and master mould comparison of computational results are as shown in Figure 9.It can be seen that：Green-Ampt is infiltrated
Instantaneous migration rate is more than instantaneous migration rate and measured value at the wetting front of improved model at the wetting front of model.With the time
Increase, improved model matched curve and measured value curve are fairly close；The wetting front of Green-Ampt Infiltration Models fitting increases
Rate is more than improved model and measured value, this is because Infiltration Model assumes caused by existing defects；Compare Green-Ampt
Infiltration Model improves Infiltration Model and considers the case where actually infiltrating, sought the numerical solution of percolation flow velocity, more closing to reality
Value.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (4)
1. a kind of improved Green-Ampt models, which is characterized in that before the wetting front of the improved Green-Ampt models
Instantaneous migration velocity and the relationship with wetting front depth：
Wherein：
Wherein：I is infiltration rate；ksFor saturated hydraulic conductivity in soil；Z is wetting front depth；sfIt is averaged matric suction for wetting front；It is dry
The moisture content of soil layer is initial aqueous rate θi；The moisture content of zone of saturation is saturated aqueous rate θs；zwFor transition region thickness.
2. a kind of ion type rareearth One-dimensional Vertical Infiltration rule using improved Green-Ampt models described in claim 1
Assay method, which is characterized in that the assay method of the ion type rareearth One-dimensional Vertical Infiltration rule includes：
Step 1, permeability intensity device are made of earth pillar, pressure-measuring pipe, Markov bottle water-feed and weighing equipment etc., are responsible for as outer diameter
The lucite tube of 50mm, length 2000mm, vertical pressure measurement pipe outside diameter 20mm, and graduated scale is posted, precision 1mm；Pressure-measuring pipe
It is blocked with gauze with supervisor coupling part；A diameter of 40mm of earth pillar, high 1890mm are tested, constant water head height is 60mm；Filling
When earth pillar, it is embedded to TDR probe monitors water-cut variations；Supervisor top is equipped with overflow pipe, and end is equipped with soakaway trench and graduated cylinder, measures
Accumulate amount of precipitation；
Step 2, rare earth sample are derived from south jiangxi Xunwu County Rare-earth Mine, place several days indoors, and weathering is completed；Before experiment,
The larger mine soil of lumpiness is simply rolled, the grain composition that sieve test measures rare earth sample is then carried out.
3. the assay method of ion type rareearth One-dimensional Vertical Infiltration rule as claimed in claim 2, which is characterized in that described
The assay method of ion type rareearth One-dimensional Vertical Infiltration rule increases with infiltrating the time, and wetting front is accumulative to be infiltrated depth and increase therewith
Long, the rare earth wetting front migration rule of different-grain diameter grading is essentially identical, first rapid growth, after tend towards stability；
Wetting front migration rate changing rule, 3% ammonium sulfate enter to be seeped into the wetting front migration rate in different-grain diameter rare earth
The trend that changes with time is identical, quickly reduces first, and then slowly development, finally tends to a stationary value；
Infiltration rate changing rule has very high infiltration rate at the initial stage of infiltrating, and over time, the infiltrating performance of rare earth is rapid
Decline, finally tends towards stability；
Saturation permeability coefficient, the rising rule of head is roughly the same in pressure-measuring pipe, initial stage rapid increase, with the increasing for infiltrating the time
Long, the rate of rising is gradually reduced, and until piezometric head height is close to certain fixed value, is tended towards stability.
4. a kind of application of improved Green-Ampt models as described in claim 1 in in-situ ionic rare earth soaks mine.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103419A (en) * | 2019-12-24 | 2020-05-05 | 中国环境科学研究院 | Mineral leaching agent migration test system and mineral leaching agent migration conversion test system |
| CN113376073A (en) * | 2021-05-18 | 2021-09-10 | 江西理工大学 | Rare earth slope preferential flow simulation test system |
| CN115184235A (en) * | 2022-07-04 | 2022-10-14 | 苏州科技大学 | Soil body infiltration calculation and slope analysis method based on indoor test |
| CN115704064A (en) * | 2021-08-17 | 2023-02-17 | 中国科学院赣江创新研究院 | System device and method for in-situ leaching exploitation test constructed based on similar model |
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