Solid waste survey and sampling method for metal mine tailings ponds

Abstract

The present invention provides a method for surveying and sampling solid waste in a metal mine tailings pond, which belongs to the field of mineral sampling technology and includes the following steps: S100, primary grouting sampling, hardening the ground in the sampling area, laying primary grouting holes in the sampling area, pouring grouting material into the primary grouting holes to form a primary grouting area, and after the grouting material reaches a preset strength, drilling and coring around the primary grouting holes to form a primary coring hole, with a coring depth equal to or greater than the depth of the primary grouting area; S200, secondary grouting sampling, pouring grouting material into the primary coring holes to form a secondary grouting area, and after the grouting material reaches a preset strength, drilling and coring along the primary coring holes to form a secondary coring hole, with a coring depth equal to or greater than the depth of the secondary grouting area; S300, N-level grouting sampling, repeating the step of S200 to perform grouting sampling until a preset sampling depth is reached. The present invention can achieve coring of the tailings pond, maintain the original state of the solid waste, and serve as an accurate exploration reference.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral sampling, and more specifically, relates to a method for surveying and sampling solid waste in a tailings pond of a metal mine. Background Art

[0002] Tailings ponds are constructed by damming valley mouths or enclosing land to store tailings or other industrial waste discharged from metal or non-metallic mines after ore sorting. Metal mine tailings ponds often contain heavy metal contaminants, making them difficult to recycle and generally classified as solid waste. However, with recent advances in solid waste treatment and mineral refining technologies, solid waste from metal mine tailings ponds can gradually be utilized.

[0003] However, before using it, it is often necessary to first understand the basic conditions such as the physical and chemical properties of the solid waste, so sampling and analysis are required. However, since the solid waste in the tailings pond is generally formed by direct accumulation, the structure is loose and porous, and the bearing capacity is poor, it is not possible to drill directly to obtain the core. If sampling is done by excavation, the amount of work is very large, so sampling of deep areas is more difficult, and it is difficult to obtain parameters such as porosity and density during sampling, which makes the treatment and utilization of solid waste in metal mine tailings ponds more difficult. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for surveying and sampling solid waste in a metal mine tailings pond, so as to solve the technical problem in the prior art of difficulty in sampling deep layers of solid waste in a metal mine tailings pond.

[0005] To achieve the above object, the present invention adopts a technical solution of providing a method for surveying and sampling solid waste from a metal mine tailings pond, comprising the following steps:

[0006] S100, primary grouting sampling, hardening the ground in the sampling area, and laying out primary grouting holes in the sampling area, pouring grouting material into the primary grouting holes to form a primary grouting area, and after the grouting material reaches a preset strength, drilling and coring around the primary grouting holes to form primary coring holes, with the coring depth being equal to or greater than the depth of the primary grouting area;

[0007] S200, secondary grouting sampling, pouring grouting material into the primary coring hole to form a secondary grouting area, and after the grouting material reaches a preset strength, drilling and coring are performed along the primary coring hole to form a secondary coring hole, with the coring depth being equal to or greater than the depth of the secondary grouting area;

[0008] S300, N-level grouting sampling, repeat the step of S200 to perform grouting sampling until the preset sampling depth is reached.

[0009] In combination with the above technical solution, in a possible implementation, the grouting material is a viscous quick-setting foam concrete slurry; step S100, step S200 and step S300 all include a step of preparing the grouting material before pouring the grouting material.

[0010] In combination with the above technical solution, in one possible implementation method, the grouting material includes, by mass, 10-35 parts of water, 12-42 parts of silicate cement, 30-48 parts of fly ash, 18-32 parts of fine sand, 2-5 parts of accelerator, 1-2 parts of foaming agent and 0.1-2 parts of pigment, wherein the fineness of the fine sand is less than 200 mesh.

[0011] In combination with the above technical solution, in a possible implementation, the step of preparing the grouting material includes:

[0012] Weigh all components except the foaming agent, stir them evenly in a high-speed pulping machine to prepare cement slurry;

[0013] The foaming agent is prepared into foam by a foaming machine, and the foam is then added to the cement slurry and stirred evenly.

[0014] In combination with the above technical solution, in a possible implementation method, in step S100 and step S200, the stopping criterion for injecting grouting material into the primary coring hole is when the grouting pressure reaches a preset pressure or the grouting pressure rises rapidly, wherein the preset pressure is 0.4-1Mpa, and the rapid rise in grouting pressure means that the rising rate of the grouting pressure exceeds 0.9Mpa / min.

[0015] In combination with the above technical solution, in a possible implementation, the grouting material is poured in step S100, step S200 and step S300, and the grouting is performed by a screw grouting machine.

[0016] In combination with the above technical solution, in a possible implementation method, in step S100, the ground of the sampling area is hardened by paving concrete, and primary grouting holes and guide holes for core drilling are formed on the hardened ground of the sampling area by drilling or pre-buried pipes.

[0017] In combination with the above technical solution, in a possible implementation method, in step S100, primary grouting holes and guide holes for core drilling are formed on the hardened ground in the sampling area by pre-buried pipe fittings; the pipe fittings include a core drilling guide pipe, a primary grouting pipe, a connecting pipe and a pressure valve, the lower end of the core drilling guide pipe and the lower end of the primary grouting pipe are both pre-buried in the hardened ground, and the upper end of the core drilling guide pipe and the upper end of the primary grouting pipe are both exposed and provided with connecting interfaces, the two ends of the connecting pipe are respectively connected and communicated with the core drilling guide pipe and the primary grouting pipe, the pressure valve is arranged on the connecting pipe, when the pressure difference at both ends of the pressure valve is less than the rated value, the pressure valve has a first opening, and when the pressure difference at both ends of the pressure valve is greater than or equal to the rated value, the pressure valve has a second opening, and the second opening > the first opening > 0.

[0018] In combination with the above technical solution, in a possible implementation, the following is further included:

[0019] S400: After recording the sample taken out from the core of the drilling hole, the grouting material on the sample is cleaned to form a core sample.

[0020] In combination with the above technical solution, in a possible implementation method, in step S400, the content of recording the sample includes recording the appearance photo of the sample, the shape and color of the exposed surface of the sample, the time and location coordinates of the sampling; the method of cleaning the grouting material on the sample includes peeling off the grouting material on the sample by knocking, flushing the sample with a high-pressure water gun, or peeling off the grouting material on the sample by ultrasound. One or more combinations thereof.

[0021] The beneficial effect of the solid waste exploration and sampling method for metal mine tailings ponds provided by the present invention is that: compared with the existing technology, the present invention first hardens the ground of the sampling area, which not only can seal the gaps on the surface of the sampling area to avoid slurry leakage, but also facilitates construction operations; then grouting is performed to form a roughly spherical stable consolidated body under the hardened ground, after which drilling and coring can be carried out to obtain samples of a certain depth, and then grouting is continued downward to form another roughly spherical stable consolidated body, and then drilling and coring can be continued downward, and the cycle is repeated until a sample of the required depth is obtained, thereby reducing the amount of engineering work and sampling costs, while being able to maintain the original state of the solid waste to the greatest extent, providing a more accurate reference for exploration and research. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of the initial sampling phase of a solid waste survey and sampling method for a metal mine tailings pond provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of the late sampling stage of the solid waste survey and sampling method for metal mine tailings ponds provided by an embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of pre-buried pipes in a solid waste survey and sampling method for a metal mine tailings pond provided by an embodiment of the present invention.

[0026] Among them, the reference numerals in the figures are as follows:

[0027] 11. Solid waste in tailings ponds; 12. Hardened ground; 13. Grouting consolidation;

[0028] 14. Grouting equipment; 15. Drilling and coring equipment;

[0029] 20. Pipe fittings; 21. Coring guide pipe; 22. Primary grouting pipe; 23. Connecting pipe;

[0030] 24. Pressure valve; 25. Connection interface. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the described embodiments are only part of the embodiments of this application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0033] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] The directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. The terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate the directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0037] The solid waste survey and sampling method for metal mine tailings ponds provided by the present invention is now described.

[0038] like Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a method for surveying and sampling solid waste from a metal mine tailings pond, comprising the following steps:

[0039] S100, primary grouting sampling, hardening the ground in the sampling area, and laying out primary grouting holes in the sampling area, pouring grouting material into the primary grouting holes to form a primary grouting area, and after the grouting material reaches a preset strength, drilling and coring around the primary grouting holes to form primary coring holes, with the coring depth being equal to or greater than the depth of the primary grouting area;

[0040] S200, secondary grouting sampling, pouring grouting material into the primary coring hole to form a secondary grouting area, and after the grouting material reaches a preset strength, drilling and coring are performed along the primary coring hole to form a secondary coring hole, with the coring depth being equal to or greater than the depth of the secondary grouting area;

[0041] S300, N-level grouting sampling, repeat the step of S200 to perform grouting sampling until the preset sampling depth is reached.

[0042] Compared with the existing technology, the solid waste exploration and sampling method for metal mine tailings ponds provided in this embodiment first hardens the ground in the sampling area, which not only seals the gaps on the surface of the sampling area to avoid slurry leakage, but also facilitates construction operations; then grouting is performed to form a roughly spherical stable consolidated body under the hardened ground, after which drilling and coring can be carried out to obtain samples of a certain depth, and then grouting is continued downward to form another roughly spherical stable consolidated body, and then drilling and coring can be continued downward, and the cycle is repeated until a sample of the required depth is obtained, thereby reducing the amount of engineering work and sampling costs, while being able to maintain the original state of the solid waste to the greatest extent, providing a more accurate reference for exploration and research.

[0043] like Figures 1 to 3 As shown, the present invention provides a specific embodiment based on the first embodiment as follows:

[0044] The grouting material is a viscous quick-setting foam concrete slurry; step S100, step S200 and step S300 all include the step of preparing the grouting material before pouring the grouting material.

[0045] Since the present invention requires the solid waste in the tailings pond to be fixed and then sampled, the strength requirement for the grouting material is not high. The use of foamed concrete slurry with foam added to the slurry can reduce the amount of slurry while meeting the use requirements, thereby reducing costs; and since the pores in the solid waste in the tailings pond are well developed, the use of viscous, fast-setting slurry is beneficial to reducing the volume of the formed grouting body, thereby reducing the amount of slurry and reducing costs; since the fast-setting slurry requires a relatively short setting time, it is best to adopt a ready-to-use method, which can better control the volume of the grouting body.

[0046] The grouting material includes, by mass, 10-35 parts of water, 12-42 parts of silicate cement, 30-48 parts of fly ash, 18-32 parts of fine sand, 2-5 parts of accelerator, 1-2 parts of foaming agent and 0.1-2 parts of pigment, wherein the fineness of the fine sand is below 200 mesh.

[0047] In this embodiment, the slurry prepared by using the above components has a grouting body whose strength is not too high and is at a reasonable level, and basically does not contain components that can affect metal minerals. It can not only meet the construction requirements of core sampling, but also facilitate the subsequent removal of the grouting material from the sample. The addition of pigments is helpful to distinguish the color of the grouting material from solid waste, so as to facilitate the subsequent inspection of the sampling samples and will not affect the inspection results.

[0048] The steps of preparing grouting material include:

[0049] Weigh all components except the foaming agent, stir them evenly in a high-speed pulping machine to prepare cement slurry;

[0050] The foaming agent is prepared into foam by a foaming machine, and then the foam is added into the cement paste and stirred evenly.

[0051] In step S100 and step S200, the stopping criteria for injecting grouting material into the primary coring hole is when the grouting pressure reaches a preset pressure or the grouting pressure rises rapidly, wherein the preset pressure is 0.4-1Mpa, and the rapid rise in grouting pressure means that the rising rate of the grouting pressure exceeds 0.9Mpa / min.

[0052] Since the solidification time of the quick-setting slurry is fixed, after a certain period of grouting, the injected slurry will gradually block the diffusion channel of the slurry due to solidification, causing the grouting pressure to increase. Therefore, when the grouting pressure reaches the preset pressure or the grouting pressure rises rapidly, it is a sign that the slurry fills the sampling area. At this time, the grouting can be stopped and wait for the slurry to form strength.

[0053] In step S100, step S200 and step S300, the grouting material is poured by a screw grouting machine to facilitate smooth pouring of the viscous grouting material.

[0054] In step S100, the ground of the sampling area is hardened by paving concrete, and primary grouting holes and guide holes for coring are formed on the hardened ground of the sampling area by drilling or pre-buried pipes.

[0055] like Figure 3As shown, in step S100, primary grouting holes and guide holes for core drilling are formed on the hardened ground in the sampling area by pre-buried pipe fittings; the pipe fittings include a core guide pipe 21, a primary grouting pipe 22, a connecting pipe 23 and a pressure valve 24, the lower end of the core guide pipe 21 and the lower end of the primary grouting pipe 22 are both pre-buried in the hardened ground, and the upper end of the core guide pipe 21 and the upper end of the primary grouting pipe 22 are both exposed and provided with a connecting interface 25, the two ends of the connecting pipe 23 are respectively connected and communicated with the core guide pipe 21 and the primary grouting pipe 22, the pressure valve 24 is provided on the connecting pipe 23, when the pressure difference at both ends of the pressure valve 24 is less than the rated value, the pressure valve 24 has a first opening, and when the pressure difference at both ends of the pressure valve 24 is greater than or equal to the rated value, the pressure valve 24 has a second opening, and the second opening>first opening>0.

[0056] Solid waste survey and sampling methods for metal mine tailings ponds also include:

[0057] S400, after recording the sample taken out from the core of the drilling, clean the grouting material on the sample to form a core sample, so as to facilitate further testing of the sample parameters such as composition and content.

[0058] In step S400, the contents recorded for the sample include recording a photograph of the sample's appearance, the shape and color of the sample's exposed surface, the time and location coordinates of sampling; the method of cleaning the grouting material on the sample includes peeling off the grouting material on the sample by knocking, flushing the sample with a high-pressure water gun, or peeling off the grouting material on the sample by ultrasound, etc., or a combination of one or more of the above methods.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

Claims

1. A method for surveying and sampling solid waste from a metal mine tailings pond, characterized in that: The following steps are involved: S100, primary grouting sampling, hardening the ground in the sampling area, and laying out primary grouting holes in the sampling area, pouring grouting material into the primary grouting holes to form a primary grouting area, and after the grouting material reaches a preset strength, drilling and coring around the primary grouting holes to form primary coring holes, with the coring depth being equal to or greater than the depth of the primary grouting area; S200, secondary grouting sampling, pouring grouting material into the primary coring hole to form a secondary grouting area, and after the grouting material reaches a preset strength, drilling and coring are performed along the primary coring hole to form a secondary coring hole, with the coring depth being equal to or greater than the depth of the secondary grouting area; S300, N-level grouting sampling, repeating the step of S200 to perform grouting sampling until a preset sampling depth is reached; In step S100, a primary grouting hole and a guide hole for core drilling are formed on the hardened ground in the sampling area by pre-buried pipe fittings; the pipe fittings include a core drilling guide pipe (21), a primary grouting pipe (22), a connecting pipe (23) and a pressure valve (24); the lower end of the core drilling guide pipe (21) and the lower end of the primary grouting pipe (22) are both pre-buried in the hardened ground, and the upper end of the core drilling guide pipe (21) and the upper end of the primary grouting pipe (22) are both exposed and provided with a connecting pipe. The interface (25) is provided, wherein both ends of the connecting pipe (23) are respectively connected to and communicated with the coring guide pipe (21) and the primary grouting pipe (22), and the pressure valve (24) is provided on the connecting pipe (23). When the pressure difference at both ends of the pressure valve (24) is less than the rated value, the pressure valve (24) has a first opening, and when the pressure difference at both ends of the pressure valve (24) is greater than or equal to the rated value, the pressure valve (24) has a second opening, and the second opening is greater than the first opening and is greater than 0.

2. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 1, wherein: The grouting material is a viscous quick-setting foam concrete slurry; step S100, step S200 and step S300 all include the step of preparing the grouting material before pouring the grouting material.

3. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 2, wherein: The grouting material comprises, by mass, 10-35 parts of water, 12-42 parts of Portland cement, 30-48 parts of fly ash, 18-32 parts of fine sand, 2-5 parts of accelerator, 1-2 parts of foaming agent and 0.1-2 parts of pigment, wherein the fineness of the fine sand is below 200 meshes.

4. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 3, wherein: The steps of preparing grouting material include: Weigh all components except the foaming agent, stir them evenly in a high-speed pulping machine to prepare cement slurry; The foaming agent is prepared into foam by a foaming machine, and then the foam is added into the cement paste and stirred evenly.

5. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 1, wherein: In step S100 and step S200, the stopping criteria for injecting grouting material into the primary coring hole is when the grouting pressure reaches a preset pressure or the grouting pressure rises rapidly, wherein the preset pressure is 0.4-1Mpa, and the rapid rise in grouting pressure means that the rising rate of the grouting pressure exceeds 0.9Mpa / min.

6. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 1, wherein: In step S100, step S200 and step S300, grouting material is poured and grouting is performed by a screw grouting machine.

7. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 1, wherein: In step S100, the ground of the sampling area is hardened by paving concrete, and primary grouting holes and guide holes for coring are formed on the hardened ground of the sampling area by drilling or pre-buried pipes.

8. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 1, wherein: Also includes: S400: After recording the sample taken out from the core of the drilling hole, the grouting material on the sample is cleaned to form a core sample.

9. The method for surveying and sampling solid waste from a metal mine tailings pond according to claim 8, wherein: In step S400, the contents of recording the sample include recording the appearance photo of the sample, the shape and color of the exposed surface of the sample, the time and location coordinates of the sampling; the method of cleaning the grouting material on the sample includes peeling off the grouting material on the sample by knocking, flushing the sample with a high-pressure water gun, or peeling off the grouting material on the sample by ultrasound. One or more combinations thereof.

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