Method for detecting porosity of in-situ heap leaching ore

Abstract

The present application provides a method for detecting the porosity of in-situ heap leaching ores, which belongs to the technical field of ore porosity detection. The present application obtains a pore model by taking an ore body on site, preparing a filler, vacuum gradient impregnation, solidifying, dissolving and separating the ore; then melts and softens the pore model to obtain the pore volume in the ore, and finally obtains the porosity of the ore; wherein, nano-SiO2 is added to the filler resin, based on the size effect and interface optimization effect of the nanomaterial, to ensure the penetration of micro-pores; vacuum gradient impregnation further ensures the full penetration of micro-pores. The detection method of the present application avoids the limitation of the drainage method on the pores of ores containing water-soluble minerals; mercury injection method, gas adsorption method, etc. require the collection of ore samples and taking them back to the laboratory for detection, which destroys the ore body structure and takes a long time. The present invention can be detected on site, providing ore permeability parameters for the in-situ heap leaching process, and providing a real-time basis for the selection of the process.

Description

Technical Field

[0001] The present invention relates to the technical field of ore porosity detection, and in particular to a method for detecting the porosity of an in-situ heap leaching ore. Background Art

[0002] Ore porosity is a key factor influencing the effectiveness of in-situ heap leaching. Porosity determines the penetration and diffusion rate of the leaching agent within the ore pile. Appropriate porosity ensures sufficient contact between the leaching agent and the ore, enabling smooth chemical reactions and improving the leaching rate of useful components. If the porosity is too high, the leaching agent may pass through the ore pile too quickly, failing to fully react with the ore and resulting in incomplete leaching. On the other hand, if the porosity is too low, the leaching agent's penetration will be hindered, similarly affecting leaching efficiency.

[0003] Traditional ore porosity testing methods, such as mercury intrusion and gas adsorption, usually require collecting ore samples and bringing them back to the laboratory for processing and analysis. However, this method has many limitations for ores that are subjected to in-situ heap leaching. On the one hand, the sample collection process may destroy the original structure and pore distribution of the ore, resulting in the test results not accurately reflecting the true porosity of the in-situ ore. On the other hand, laboratory testing cycles are long and the cost is high, making it impossible to provide porosity data for the in-situ heap leaching process in a timely manner, which is not conducive to real-time monitoring and optimization of the heap leaching process. In addition, the drainage method cannot be routinely used for some water-soluble minerals. Therefore, there is an urgent need for a method that can detect ore porosity in situ, quickly and accurately to meet the needs of the development of in-situ heap leaching technology. Summary of the Invention

[0004] In view of the technical problems existing in the background technology, the present application provides a method for detecting the porosity of in-situ heap leaching ore, which aims to solve the problems of existing in-situ heap leaching ore porosity detection, such as the inability to detect in situ, long detection cycle, inability to monitor in real time, and limited scope of application.

[0005] The present application provides a method for detecting the porosity of an in-situ heap leaching ore, comprising the following steps:

[0006] S1. Preparation of experimental samples: Take the ore body on site, process it into a standard sample, and calculate the volume V of the standard sample;

[0007] S2. Preparation of pore filler: The curing agent and nano-SiO2 were added to the vinyl resin, ultrasonically treated, and then allowed to stand to obtain a pore filler;

[0008] S3 mold pretreatment: the standard sample and the inner wall of the mold is evenly sprayed with release oil, and then the standard sample after spraying the release oil is placed in the mold, and then placed together in a vacuum container;

[0009] S4. Vacuum gradient impregnation: The vacuum container is subjected to a first vacuum treatment, and then the pore filler is injected into the mold for the first time, and a first infiltration is performed. Then, the vacuum container is subjected to a second vacuum treatment, and then the pore filler is injected for a second time, and a second infiltration is performed to obtain an impregnated sample;

[0010] S5 gradient curing: the impregnated sample was first allowed to stand at room temperature, and then cured to obtain a cured sample;

[0011] S6. Gradient dissolution separation: The solidified sample is pretreated and then placed in a dissolution separation solution. After the dissolution is completed, a complete three-dimensional pore model is obtained;

[0012] S7. Softening the pore model: placing the three-dimensional pore model in a mold having an inner wall coated with the release oil, and performing a temperature-programmed softening process. After the three-dimensional pore model is completely softened, the height h of the softened three-dimensional pore model is measured, and the volume V1 of the three-dimensional pore model is calculated;

[0013] S8. Calculate the porosity of the standard sample: porosity = V1 / V×100%.

[0014] In the technical solution of the embodiments of this application, a pore model is obtained by extracting an ore body on-site, preparing a filler, vacuum gradient impregnation, solidifying, and dissolving and separating the ore. The pore model is then melted and softened to determine the pore volume in the ore, and ultimately the ore porosity. Nano-SiO2 is added to the filler resin to ensure penetration of micropores based on the size effect and interface optimization of the nanomaterial. Vacuum gradient impregnation further ensures sufficient penetration of micropores. This detection method can quickly measure porosity on-site, providing ore permeability parameters for in-situ heap leaching processes and a basis for process selection. It has important economic and social significance for environmental protection and comprehensive resource utilization in my country.

[0015] In some embodiments, in step S2, the mass ratio of the vinyl resin, the curing agent and the nano-SiO2 is 2:1:0.5, and the particle size of the nano-SiO2 is 50-100 nm.

[0016] In this embodiment, nano-SiO2 modified filler is added to the resin to improve the filling rate of micropores. SiO2 nanoparticles can freely diffuse through Brownian motion, allowing the filler to enter the micropores. After adding nano-SiO2 to fillers such as vinyl resin, the nanoparticles can reduce the viscosity of the filler through the steric effect, improve its flow properties under low pressure or vacuum environment, and can fill the complex micropore network more quickly. In addition, the surface of nano-SiO2 is rich in hydroxyl groups, which can form hydrogen bonds with resin molecules, reducing the shrinkage rate of the filler during the curing process, avoiding the problem of incomplete filling of micropores due to shrinkage, and ensuring the integrity of the pore model.

[0017] In some embodiments, in step S3, the release oil includes a fluorosilane-modified compound.

[0018] In this embodiment, by adding a fluorosilane-modified compound to the demoulding oil, a low-surface-energy, high-stability nanoscale isolation film is constructed between the mold and the sample, thereby cutting off the interfacial adhesion between the two and achieving easy demoulding.

[0019] In some embodiments, in step S4, the vacuum degree in the first vacuuming treatment is -0.09 MPa, the first penetration time is 5 minutes, the pressure in the second vacuuming treatment is 0.1 MPa, and the second penetration time is 10-20 minutes.

[0020] In this embodiment, by combining a vacuum-micro-pressure staged injection process, the problem of insufficient filling of pores below 5 μm by traditional fillers is solved, thereby improving the integrity of the pore model.

[0021] In some embodiments, in step S5, the standing time is 2 hours, the curing temperature is 40° C., and the curing time is 1 to 3 hours.

[0022] In this embodiment, a gradient curing process of "room temperature standing + constant temperature curing" is adopted to reduce cracks caused by the curing shrinkage of the filler.

[0023] In some embodiments, in step S6, the pretreatment includes the following steps: placing the solidified ore sample in 5% dilute hydrochloric acid, soaking for 10 minutes, and then washing the sample with deionized water.

[0024] In this embodiment, surface soluble impurities are removed through pretreatment.

[0025] In some embodiments, in step S6, the dissolving and separating liquid includes concentrated hydrochloric acid, concentrated nitric acid and a corrosion inhibitor, the corrosion inhibitor includes benzotriazole, and the volume ratio of the concentrated hydrochloric acid, concentrated nitric acid and corrosion inhibitor is 1:3:0.02.

[0026] In this embodiment, concentrated hydrochloric acid and concentrated nitric acid can dissolve the sulfide in the ore, thereby disintegrating the ore, and adding a corrosion inhibitor can protect the filler from corrosion.

[0027] In some embodiments, in step S6, the dissolution temperature is 30° C., the oscillation speed during the dissolution is 150 r / min, and the dissolution time is 5 to 30 min.

[0028] In this embodiment, appropriate dissolution conditions can be used to avoid damage to the pore mold and enable the ore and the mold to be completely separated.

[0029] In some embodiments, in step S7, the programmed temperature-raising softening process includes the following steps: heating from room temperature to 200°C at a rate of 5°C / min, and then keeping the temperature for 30 minutes.

[0030] In this embodiment, the pore model is softened uniformly through a programmed temperature-raising softening process.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and are not intended to limit the scope of protection of the present application.

[0033] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0034] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0036] In order to solve the problems of existing in-situ heap leaching ore porosity detection that cannot be detected in situ, has a long detection cycle, cannot be monitored in real time, and has a limited scope of application, the present application provides a method for detecting the porosity of in-situ heap leaching ore. The ore body is taken on site, a filler is prepared, vacuum gradient impregnation is carried out, solidification is carried out, and the ore is dissolved and separated to obtain a pore model; the pore model is then melted and softened to obtain the pore volume in the ore, and finally the porosity of the ore is obtained; wherein, nano-SiO2 is added to the filler resin to ensure the penetration of micropores based on the size effect and interface optimization of nanomaterials; a vacuum-micropressure segmented injection process is used to further ensure the full penetration of micropores and improve the integrity of the pore model; a gradient curing process of "normal temperature static + constant temperature curing" is used to reduce shrinkage cracks generated during the filler curing process; and an application temperature rise softening technology is used to make the pore model uniformly softened and dissolved. The above operations greatly improve the accuracy of the test process. The detection method of this application avoids the limitations of drainage methods on the pores of ores containing water-soluble minerals. Methods such as mercury intrusion porosimetry and gas adsorption require ore samples to be collected and brought back to the laboratory for testing, which disrupts the ore structure and is time-consuming. The present invention can be tested on-site, providing ore permeability parameters for in-situ heap leaching processes, providing real-time basis for process selection.

[0037] The present application provides a method for detecting the porosity of an in-situ heap leaching ore, comprising the following steps:

[0038] S1. Preparation of experimental samples: Take the ore body on site, process it into a standard sample, and calculate the volume V of the standard sample;

[0039] S2. Preparation of pore filler: The curing agent and nano-SiO2 were added to the vinyl resin, ultrasonically treated, and then allowed to stand to obtain a pore filler;

[0040] S3 mold pretreatment: the standard sample and the inner wall of the mold is evenly sprayed with release oil, and then the standard sample after spraying the release oil is placed in the mold, and then placed together in a vacuum container;

[0041] S4. Vacuum gradient impregnation: The vacuum container is subjected to a first vacuum treatment, and then the pore filler is injected into the mold for the first time, and a first infiltration is performed. Then, the vacuum container is subjected to a second vacuum treatment, and then the pore filler is injected for a second time, and a second infiltration is performed to obtain an impregnated sample;

[0042] S5 gradient curing: the impregnated sample was first allowed to stand at room temperature, and then cured to obtain a cured sample;

[0043] S6. Gradient dissolution separation: After the solidified sample is demolded, pretreated, and then placed in a dissolution separation liquid. After the dissolution is completed, a complete three-dimensional pore model is obtained;

[0044] S7. Softening the pore model: placing the three-dimensional pore model in a mold having an inner wall coated with the release oil, and performing a temperature-programmed softening process. After the three-dimensional pore model is completely softened, the height h of the softened three-dimensional pore model is measured, and the volume V1 of the three-dimensional pore model is calculated;

[0045] S8. Calculate the porosity of the standard sample: porosity = V1 / V×100%.

[0046] In the technical solution of the embodiments of this application, a pore model is obtained by extracting an ore body on-site, preparing a filler, vacuum gradient impregnation, solidifying, and dissolving and separating the ore. The pore model is then melted and softened to determine the pore volume in the ore, and ultimately the ore porosity. Nano-SiO2 is added to the filler resin to ensure penetration of micropores based on the size effect and interface optimization of the nanomaterial. Vacuum gradient impregnation further ensures sufficient penetration of micropores. This detection method can quickly measure porosity on-site, providing ore permeability parameters for in-situ heap leaching processes and a basis for process selection. It has important economic and social significance for environmental protection and comprehensive resource utilization in my country.

[0047] Furthermore, in some embodiments, in step S1, the standard sample is a cube.

[0048] Furthermore, in some embodiments, in step S2, the mass ratio of the vinyl resin, the curing agent and the nano-SiO2 is 2:1:0.5, the particle size of the nano-SiO2 is 50~100nm, and the curing agent is one or more of methyl ethyl ketone peroxide, benzoyl peroxide and di-tert-butyl peroxide.

[0049] In the technical solution of the embodiment of the present application, nano-SiO2 modified filler is added to the resin to improve the filling rate of micro-pores. SiO2 nanoparticles can diffuse freely through Brownian motion, allowing the filler to enter the micro-pores; and after adding nano-SiO2 to fillers such as vinyl resin, the nanoparticles can reduce the viscosity of the filler through the steric effect, improve its flow properties under low pressure or vacuum environment, and can fill the complex micro-pore network more quickly; in addition, the surface of nano-SiO2 is rich in hydroxyl groups, which can form hydrogen bonds with resin molecules, reducing the shrinkage rate of the filler during the curing process, avoiding the problem of incomplete filling of micro-pores due to shrinkage, and ensuring the integrity of the pore model.

[0050] Furthermore, in some embodiments, in step S2, the power of the ultrasonic treatment is 300 W, the time of the ultrasonic treatment is 10 min, and the standing time is 5 min.

[0051] In the technical solution of the embodiment of the present application, SiO2 nanoparticles and the curing agent are uniformly dispersed in the resin through ultrasonic dispersion treatment, and the curing agent is degassed by standing.

[0052] Furthermore, in some embodiments, in step S3, the gap between the mold and the standard sample is no greater than 0.1 mm.

[0053] In the technical solution of the embodiment of the present application, the mold whose size matches the standard sample can prevent the injected filler from overflowing and adhering to the surface of the ore in large quantities.

[0054] Furthermore, in some embodiments, in step S3, the mold release oil is mineral oil, and the mold release oil includes a fluorosilane-modified compound. Preferably, the fluorosilane-modified compound is perfluorooctyltrimethoxysilane.

[0055] In the technical solution of the embodiment of the present application, a fluorosilane-modified compound is added to the demoulding oil to construct a low-surface-energy, high-stability nanoscale isolation film between the mold and the sample, thereby cutting off the interfacial adhesion between the two and achieving easy demoulding.

[0056] Furthermore, in some embodiments, in step S4, the mass ratio of the pore filler injected for the first time to the pore filler injected for the second time is 3:2; the vacuum degree in the first vacuum treatment is -0.09 MPa, the first penetration time is 5 minutes, the pressure in the second vacuum treatment is 0.1 MPa, and the second penetration time is 10~20 minutes; further, the total mass of the pore filler is estimated based on the estimated porosity.

[0057] In the technical solution of the embodiment of the present application, by combining a vacuum-micro-pressure staged injection process, the problem of insufficient filling of pores below 5 μm by traditional fillers is solved, thereby improving the integrity of the pore model.

[0058] Furthermore, in some embodiments, in step S5, the standing time is 2 hours, the solidification temperature is 40° C., and the solidification time is 1 to 3 hours, and the solidification time is adjusted according to the estimated porosity of the ore.

[0059] In the technical solution of the embodiment of the present application, a gradient curing process of "room temperature standing + constant temperature curing" is adopted to reduce the cracks caused by the curing shrinkage of the filler.

[0060] Furthermore, in some embodiments, in step S6, the pretreatment includes the following steps: placing the solidified ore sample in 5% dilute hydrochloric acid, soaking for 10 minutes, and then washing the sample with deionized water.

[0061] In the technical solution of the embodiment of the present application, surface soluble impurities are removed through pretreatment.

[0062] Furthermore, in some embodiments, in step S6, the dissolution and separation liquid includes concentrated hydrochloric acid, concentrated nitric acid and a corrosion inhibitor, the corrosion inhibitor includes benzotriazole, and the volume ratio of the concentrated hydrochloric acid, concentrated nitric acid and corrosion inhibitor is 1:3:0.02.

[0063] In the technical solution of the embodiment of the present application, concentrated hydrochloric acid and concentrated nitric acid can dissolve the sulfide in the ore, thereby disintegrating the ore, and adding a corrosion inhibitor can protect the filler from corrosion.

[0064] Furthermore, in some embodiments, in step S6, the dissolution temperature is 30° C., the oscillation speed during the dissolution is 150 r / min, the dissolution time is 5 to 30 min, and the dissolution time is dynamically adjusted according to the hardness of the ore.

[0065] In the technical solution of the embodiment of the present application, through appropriate dissolution conditions, the pore mold can be prevented from being damaged and the ore and the mold can be completely separated.

[0066] Furthermore, in some embodiments, in step S7, the programmed temperature-raising softening process includes the following steps: heating from room temperature to 200°C at a rate of 5°C / min, and then keeping the temperature for 30 minutes.

[0067] Furthermore, in some embodiments, in step S7, the mold is a cuboid with a bottom side length of B cm.

[0068] In the technical solution of the embodiment of the present application, the pore model is softened uniformly through a programmed temperature-raising softening process.

[0069] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0070] Example 1

[0071] This embodiment provides a method for detecting the porosity of an in-situ heap leaching ore, which specifically includes the following steps:

[0072] (1) Take the ore body on site and process it into a standard cube sample with a side length of 15 cm. Calculate its volume V = 3375 cm 3 .

[0073] (2) Methyl ethyl ketone peroxide and SiO2 with a particle size of 75 nm were added to vinyl resin, ultrasonically treated at 300 W for 10 minutes, and then allowed to stand for 5 minutes to obtain a pore filler, wherein the mass ratio of vinyl resin, methyl ethyl ketone peroxide and SiO2 was 2:1:0.5.

[0074] (3) Spray the above-mentioned standard sample and the inner wall of the mold with release oil containing perfluorooctyltrimethoxysilane, then put the standard sample into the mold, and then place it in a container, wherein the gap between the inner wall of the mold and the standard sample is 0.1 mm.

[0075] (4) The container was evacuated for 10 minutes to a vacuum degree of -0.09 MPa, and then 60% of the pore filler was added and infiltrated for 5 minutes. Then 40% of the pore filler was added and the pressure was adjusted to 0.1 MPa and infiltrated for 15 minutes to obtain the impregnated sample.

[0076] (5) The impregnated sample was allowed to stand at room temperature for 2 h, and then cured at 40 °C for 2 h to obtain a cured sample.

[0077] After demolding the above-mentioned solidified sample, the solidified sample was placed in a beaker, prepared with 5% dilute hydrochloric acid, poured into the beaker, pretreated for 10 minutes, and then washed with deionized water. It was then placed in a mixed solution of concentrated hydrochloric acid, concentrated nitric acid, and benzotriazole in a volume ratio of 1:3:0.02, and dissolved at a temperature of 30°C and an oscillation speed of 150 r / min for 20 minutes to remove the surface ore and obtain a three-dimensional pore model.

[0078] (6) The three-dimensional pore model was placed in a rectangular mold with a bottom side length of 10 cm and the inner wall of which was coated with release oil containing perfluorooctyltrimethoxysilane. The temperature was raised from room temperature to 200°C at a rate of 5°C / min and then kept warm for 30 minutes. The height of the softened three-dimensional pore model was measured to be h = 4 cm. The volume of the three-dimensional pore model V1 = 10 × 10 × 4 = 400 cm 3 .

[0079] (7) Calculate the porosity of the standard sample: porosity = V1 / V × 100% = (400 / 3375) × 100% = 11.85%.

[0080] Comparative Examples 1-4

[0081] Comparative Examples 1 to 4 respectively provide a method for detecting the porosity of an in-situ heap leaching ore. Compared with Example 1, the differences are that SiO2 is not added in step (2) of Comparative Example 1; 100% of a pore filler is directly added at a vacuum degree of -0.09 MPa in step (4) of Comparative Example 2, and the pores are infiltrated for 20 minutes; step (5) of Comparative Example 3 is not allowed to stand at room temperature; step (7) of Comparative Example 4 is directly placed at 200°C to soften for 30 minutes; the other steps are substantially the same as those in Example 1 and are not repeated here.

[0082] The height, volume and porosity of the pore models obtained in Comparative Examples 1 to 4 are shown in Table 1.

[0083] Table 1 Height, volume and porosity of the pore model obtained in Comparative Examples 1 to 4

[0084]

[0085] From the test results in Table 1, it can be seen that the porosities measured in Comparative Examples 1 to 3 are all relatively small. This is because, in Comparative Example 1, no SiO2 was added to the deep pore filler, resulting in the pore filler being unable to penetrate into the tiny pores, making the volume of the pore model relatively small; in Comparative Example 2, no vacuum-micro-pressure staged injection was performed, which also resulted in insufficient penetration of the pore filler into the tiny pores, resulting in a relatively small volume of the pore model; in Comparative Example 3, the gradient curing process of "normal temperature standing + constant temperature curing" was not adopted, resulting in the filler shrinking rapidly during curing and producing cracks, resulting in a relatively small volume of the pore model; in Comparative Example 4, the pore model was directly softened and dissolved at high temperature, causing the volume of the pore model to expand at high temperature, resulting in a relatively large volume of the pore model.

[0086] In summary, the present application provides a method for detecting the porosity of in-situ heap leaching ores. Take the ore body on site, prepare the filler, vacuum gradient impregnate, solidify, dissolve and separate the ore to obtain a pore model; then melt and soften the pore model to obtain the pore volume in the ore, and finally obtain the porosity of the ore; wherein, nano-SiO2 is added to the filler resin, based on the size effect and interface optimization effect of the nanomaterial, to ensure the penetration of micropores; a combination of vacuum-micro-pressure segmented injection process is adopted to further ensure the full penetration of micropores and improve the integrity of the pore model; a gradient solidification process of "normal temperature standing + constant temperature solidification" is adopted to reduce shrinkage cracks generated during the filler solidification process; an application temperature rise softening technology is used to make the pore model uniformly softened and dissolved. The above operations greatly improve the accuracy of the test process. The detection method of the present application avoids the limitations of the drainage method on the pores of ores containing water-soluble minerals; the mercury injection method, gas adsorption method, etc. require the collection of ore samples and bring them back to the laboratory for testing, which destroys the ore body structure and takes a long time. The present invention can be tested on site, providing ore permeability parameters for the in-situ heap leaching process and providing a real-time basis for the selection of the process.

[0087] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for detecting the porosity of an in-situ heap leaching ore, characterized in that: The following steps are involved: S1. Preparation of experimental samples: Take the ore body on site, process it into a standard sample, and calculate the volume V of the standard sample; S2. Preparation of pore filler: The curing agent and nano-SiO2 were added to the vinyl resin, ultrasonically treated, and then allowed to stand to obtain a pore filler; S3 mold pretreatment: the standard sample and the inner wall of the mold is evenly sprayed with release oil, and then the standard sample after spraying the release oil is placed in the mold, and then placed together in a vacuum container; S4. Vacuum gradient impregnation: The vacuum container is subjected to a first vacuum treatment, and then the pore filler is injected into the mold for the first time, and a first infiltration is performed. Then, the vacuum container is subjected to a second vacuum treatment, and then the pore filler is injected for a second time, and a second infiltration is performed to obtain an impregnated sample; S5 gradient curing: the impregnated sample was first allowed to stand at room temperature, and then cured to obtain a cured sample; S6. Gradient dissolution separation: After the solidified sample is demolded, pretreated, and then placed in a dissolution separation liquid. After the dissolution is completed, a complete three-dimensional pore model is obtained; S7. Softening the pore model: placing the three-dimensional pore model in a mold having an inner wall coated with the release oil, and performing a temperature-programmed softening process. After the three-dimensional pore model is completely softened, the height h of the softened three-dimensional pore model is measured, and the volume V1 of the three-dimensional pore model is calculated; S8. Calculate the porosity of the standard sample: porosity = V1 / V×100%.

2. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S2, the mass ratio of the vinyl resin, the curing agent and the nano-SiO2 is 2:1:0.5, and the particle size of the nano-SiO2 is 50-100 nm.

3. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S3, the release oil includes a fluorosilane-modified compound.

4. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S4, the mass ratio of the pore filler injected for the first time to the pore filler injected for the second time is 3:

2.

5. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S4, the vacuum degree in the first vacuuming treatment is -0.09 MPa, the first penetration time is 5 minutes, the pressure in the second vacuuming treatment is 0.1 MPa, and the second penetration time is 10 to 20 minutes.

6. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S5, the standing time is 2 hours, the curing temperature is 40° C., and the curing time is 1 to 3 hours.

7. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S6, the pretreatment includes the following steps: placing the solidified ore sample in 5% dilute hydrochloric acid, soaking for 10 minutes, and then washing the sample with deionized water.

8. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S6, the dissolving and separating liquid includes concentrated hydrochloric acid, concentrated nitric acid and a corrosion inhibitor, the corrosion inhibitor includes benzotriazole, and the volume ratio of the concentrated hydrochloric acid, concentrated nitric acid and corrosion inhibitor is 1:3:0.

02.

9. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S6, the dissolution temperature is 30° C., the oscillation speed during the dissolution is 150 r / min, and the dissolution time is 5 to 30 min.

10. The method for detecting the porosity of in-situ heap leaching ore according to claim 1, characterized in that: In step S7, the programmed temperature-raising softening process includes the following steps: heating from room temperature to 200°C at a rate of 5°C / min, and then keeping the temperature for 30 minutes.

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