Ore dump leaching column for laboratory

Abstract

The utility model provides an ore dump leaching column for a laboratory. The ore heap leaching column comprises a heap leaching chamber, a lower filter plate and a liquid collecting cone which are connected with one another from top to bottom, the heap leaching chamber is used for enabling ore and leachate to be subjected to chemical reaction in a heap leaching test so as to extract target metal, and the lower filter plate is used for supporting an ore heap and filtering impurities in leached pregnant solution; the heap leaching chamber is internally provided with a liquid collecting cone, the liquid collecting cone is used for collecting a leached pregnant solution, the heap leaching chamber is internally provided with a liquid distribution system, the liquid distribution system is used for uniformly permeating and diffusing a leaching solution into an ore heap and supplementing dissolved oxygen during a heap leaching test interval, and the liquid distribution system comprises a liquid distribution pipe which is tightly attached to the inner wall of the heap leaching chamber and is distributed in a spiral shape; and the liquid distribution pipe is provided with a liquid outlet hole for discharging leachate and air. The liquid distribution system enables leaching liquid to be evenly distributed to all parts of an ore heap, dissolved oxygen can be effectively supplemented, the reaction rate is increased, and the defects that a conventional spraying mode is limited in diffusion effect, and a device is complex are overcome.

Description

Technical Field

[0001] This utility model relates to the technical field of mining engineering, and in particular to a laboratory ore heap leaching column. Background Technology

[0002] A heap leaching column, also known as a percolation leaching column, is a device used in heap leaching experiments. It is typically a cylindrical container made of plexiglass, plastic, or other corrosion-resistant materials, filled with the ore to be leached. By adding leaching solution into the heap leaching column and allowing it to permeate through the ore heap, the useful components in the ore are selectively dissolved and leached. The working principle of an ore heap leaching column is based on the dissolution of useful components in the ore by the leaching solution, which are then transferred to the liquid phase (leaching solution) in the form of ions or complexed ions. The leached ions in the liquid phase are then converted into elemental metals.

[0003] Currently, there are no complete sets of equipment for heap leaching tests both domestically and internationally. In laboratory heap leaching tests, the heap leaching columns used are all self-made and vary in style. These columns typically suffer from uneven solution distribution and insufficient leachate diffusion during testing, thus failing to accurately simulate actual ore heap leaching production and providing insufficient data to guide production practices. In laboratory heap leaching tests, due to the uneven particle size of the ore within the column (mostly 20mm and 30mm lumps), when there are many large ore pieces, the leachate drips from the upper end of the column onto the ore and then rapidly flows downwards to the lower end, entering the precious solution tank. During this process, the leachate has a short residence time on the surface of the lumpy ore, preventing effective chemical reaction with the ore sample. Conversely, when there are many fine, muddy ore pieces, the leachate remains in the column for a long time, hindering proper circulation and dissolved oxygen replenishment, thus reducing the reaction rate between the ore sample and the leachate. Both of these conditions can lead to significant differences between the actual leaching results in the laboratory and actual production.

[0004] CN219964022U discloses a segmented heap leaching test column, comprising a column with a feed inlet, a liquid inlet, a discharge outlet, and a liquid outlet, and an internal heap leaching chamber. A lifting mechanism is located above the column. A filter plate, connected to the discharge outlet, is located inside the heap leaching chamber and above the liquid outlet. The column is composed of multiple segments stacked sequentially. The uppermost segment contains a heap leaching solution spraying assembly, and the lowermost segment contains a spiral slag cleaner connected to a slag removal assembly. The liquid outlet is located on the spiral slag cleaner and is connected via a liquid outlet pipeline to a heap leaching solution circulation tank and a slag-containing heap leaching solution storage tank. The heap leaching solution circulation tank is connected to the heap leaching solution spraying assembly via a circulation pipeline. This invention allows for flexible adjustment of the column height through multiple segments, adapting to different types of ore heap leaching tests, obtaining accurate test data, and providing reliable technical support for ore heap leaching production process design.

[0005] CN207488285U discloses a test apparatus for heap leaching of ore, including a support, a heap leaching column installed in the middle of the support, a precious liquor recovery cylinder installed below the support, a heap leaching spray device installed on the heap leaching column, a rotor flow meter, a circulating pump, an electromagnetic relay, and an automatic control system installed on the side of the support. These devices form a precious liquor circulation system, a uniform liquor distribution system, and a flow control system, which can automatically, reliably, and uniformly distribute the leachate on the ore surface. At the same time, it can conduct tests on conditions such as spraying time and flow rate, heap height, and ore particle size, providing better technical basis for on-site production.

[0006] However, in the aforementioned existing technologies, the leaching solution is usually dissolved and leached from the ore using a traditional spraying method. This still presents problems such as uneven distribution of the leaching solution or the inability to replenish dissolved oxygen in a timely manner, which are also problems that urgently need to be solved in the structural design of ore heap leaching columns. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a laboratory heap leaching column for ore. The laboratory heap leaching column is equipped with a spirally distributed solution distribution system. During operation, this system ensures the even distribution of the leachate to all parts of the ore heap and creates disturbance within the heap, improving leaching efficiency. When the heap leaching column is not in operation, the system effectively replenishes dissolved oxygen, increasing the reaction rate and overcoming the limitations of conventional spraying methods, such as limited diffusion and complex equipment.

[0008] The technical solution of this utility model is as follows:

[0009] This invention provides a laboratory heap leaching column for ore. The column comprises a heap leaching chamber, a lower filter plate, and a collection cone, connected from top to bottom. The heap leaching chamber allows the ore and leaching solution to undergo a chemical reaction during the heap leaching test to extract the target metal. The lower filter plate supports the ore pile and filters impurities from the leached solution. The collection cone collects the leached solution.

[0010] The heap leaching chamber is equipped with a solution distribution system, which is used to uniformly penetrate and diffuse the leaching solution into the ore heap and to replenish dissolved oxygen during intervals in the heap leaching test.

[0011] The solution distribution system includes solution distribution pipes that are closely attached to the inner wall of the heap leaching chamber and distributed in a spiral shape. The solution distribution pipes are provided with outlet holes to discharge leachate and air.

[0012] Furthermore, the size of the ore heap leaching column is usually determined based on the amount of ore piled up, the required amount of leaching solution, and the required leaching efficiency.

[0013] More specifically, the ore heap leaching column is cylindrical with an inner diameter of 150 mm, a wall thickness of 10 mm, an outer diameter of 170 mm, and a height of 850 mm.

[0014] Furthermore, the leaching system also includes a peristaltic pump or an aeration pump connected to the upper interface of the leaching pipe, which ensures control of the leachate flow rate and a stable supply of dissolved oxygen. The peristaltic pump can precisely control the flow rate and pressure of the leachate, ensuring that the leachate is evenly distributed into the ore pile through the leaching pipe. The aeration pump replenishes dissolved oxygen to the leachate during intervals in the heap leaching test, thereby increasing the reaction rate.

[0015] Furthermore, the liquid distribution pipe is made of a corrosion-resistant, high-strength, and easily processed material, such as any one of plexiglass or plastic, which can ensure the long-term stable operation of the liquid distribution pipe.

[0016] Furthermore, the upper end of the liquid distribution pipe is fixed to the upper end face of the heap leaching chamber, and the lower end of the liquid distribution pipe is fixed to the inner wall of the heap leaching chamber at a distance of 8-15mm from the lower filter plate. The liquid distribution pipe starts from the upper end face of the heap leaching chamber and is distributed in a spiral shape at 20-40°, extending downward to the top of the lower filter plate.

[0017] More specifically, the liquid distribution pipes are distributed in a 30° spiral pattern from top to bottom throughout the entire inner cavity of the heap leaching chamber, closely attached to the inner wall of the chamber.

[0018] Furthermore, the lower end of the liquid distribution pipe is in a closed state and is fixed to the inner wall of the heap leaching chamber by welding or bonding to prevent the leaching solution from leaking and ore particles from entering the interior of the liquid distribution pipe.

[0019] More specifically, the lower end of the liquid distribution tube has a sealing structure, such as any one of a sealing ring, sealant, etc.

[0020] Furthermore, when the distribution pipes are spirally distributed in the heap leaching chamber, they are divided into several segments. The two ends of each distribution pipe segment are fixed to the inner wall of the heap leaching chamber by welding, bonding, or snapping to prevent the distribution pipes from loosening or falling off during the heap leaching test. The angle between each distribution pipe segment and the horizontal line is 20-40°. Two adjacent distribution pipe segments divide the heap leaching chamber into several reaction zones, so that the ore piles in the reaction zones at different heights can fully contact the leachate permeating from the distribution pipes above, increasing the contact area and contact time between the leachate and the ore.

[0021] More specifically, when the height of the ore heap leaching column is 850 mm, the inner diameter is 150 mm, and the angle between each section of the liquid distribution pipe and the horizontal line is 30°, the heap leaching chamber is divided into 10-12 reaction zones, thereby better achieving uniform distribution of the leaching solution in the ore heap and efficient leaching.

[0022] Furthermore, the liquid distribution pipe has an inner diameter of 10 mm, a wall thickness of 2 mm, and an outer diameter of 14 mm, which can provide appropriate flow rate and pressure.

[0023] Furthermore, when the length of each distribution pipe segment is L, outlet holes are opened at intervals of L / 15 to L / 10. The number of outlet holes opened on each distribution pipe segment should be appropriate. On the one hand, this avoids the accumulation of leachate in the distribution pipe due to too few outlet holes, thus ensuring the continuity and stability of leachate discharge. On the other hand, it ensures the uniform distribution of leachate on the distribution pipe, while avoiding flow dispersion caused by too many outlet holes.

[0024] More specifically, when the height of the ore heap leaching column is 850 mm, the inner diameter is 150 mm, and the angle between each section of the liquid distribution pipe and the horizontal line is 30°, a liquid outlet hole is opened every 12-18 mm, preferably 15 mm, on each section of the liquid distribution pipe for the discharge of leachate and air from the liquid distribution pipe.

[0025] Furthermore, the shape of the outlet hole can be circular or elliptical to ensure that the leachate can flow out smoothly and reduce the risk of blockage; the shape of the outlet hole can also be oblique or conical to reduce the impact of the fluid on the ore pile and improve leaching efficiency.

[0026] Furthermore, the size of the outlet hole is adjusted according to the characteristics of the ore pile and the requirements of the leachate, and is usually 2-4 mm.

[0027] Furthermore, the arrangement of the liquid outlet holes on each liquid distribution pipe can be any one of the following: linear arrangement, staggered arrangement, or spiral arrangement.

[0028] Furthermore, in order to prevent the liquid outlet from being blocked by ore particles or impurities, a filter structure, such as a filter screen or filter cloth, is provided at the outlet.

[0029] Furthermore, the filter pore size of the lower filter plate is 9-10 mm.

[0030] Furthermore, the filter holes of the lower filter plate are circular or elliptical with a diameter of 146-149 mm to ensure that they are not easily clogged by mineral particles during long-term use.

[0031] Furthermore, the lower filter plate is made of corrosion-resistant, high-strength, and easy-to-process materials, such as plastic or plexiglass.

[0032] Furthermore, the surface of the lower filter plate is covered with filter cloth or filter screen, which can further filter out ore particles and impurities in the leachate, ensuring the purity of the leachate and preventing impurities from interfering with subsequent processing.

[0033] Furthermore, the lower filter plate is provided with reinforcing ribs or supporting structures to enhance its load-bearing capacity and prevent deformation or damage during long-term use.

[0034] Furthermore, the lower filter plate has a detachable and easy-to-clean structure, which prevents the accumulation of impurities and clogging of filter holes over a long period of time, and facilitates regular cleaning and maintenance of the lower filter plate.

[0035] Furthermore, the ore heap leaching column also includes an upper filter plate, which is disposed below the upper end face of the heap leaching chamber to cover the surface of the ore heap and prevent dust and debris from entering the leaching system during the heap leaching test.

[0036] Furthermore, the liquid collecting cone is positioned directly below the lower filter plate, and its connection to the lower filter plate includes, but is not limited to, flange connection, threaded connection, etc.

[0037] Furthermore, the liquid collecting cone is made of materials that are corrosion-resistant and high-temperature resistant, including plastics, plexiglass, etc.

[0038] Furthermore, the height of the liquid collecting cone is 70 mm and the cone angle is 45°.

[0039] Furthermore, the bottom center of the liquid collecting cone is connected to a drain pipe for discharging the leachate. The connection method between the liquid collecting cone and the drain pipe includes, but is not limited to, any one of the following: integrated connection, welding, flange connection, threaded connection, etc.

[0040] Furthermore, the drain pipe has an inner diameter of 10 mm, a wall thickness of 3 mm, an outer diameter of 16 mm, and a length of 50 mm.

[0041] Furthermore, the ore heap leaching column also includes an inverted cone support at the bottom of the liquid collecting cone, the upper part of which is in close contact with the bottom of the liquid collecting cone to support and fix the liquid collecting cone.

[0042] Furthermore, the upper part of the inverted cone support at the bottom of the liquid collecting cone is connected to the bottom of the liquid collecting cone by welding, bolting, or other means to ensure the firmness and sealing of the connection.

[0043] Furthermore, one side of the inverted cone support at the bottom of the liquid collecting cone is closely attached to the inner wall of the ore heap leaching column, and the other side is separated from the drain pipe by a certain distance and parallel to the drain pipe. The bottom of the inverted cone support at the bottom of the liquid collecting cone and the bottom of the drain pipe are on the same horizontal plane.

[0044] Furthermore, the number of inverted cone supports at the bottom of the liquid collecting cone is four, and the inverted cone supports at the bottom of each two adjacent liquid collecting cones are set at 90°.

[0045] The technical solution provided by this utility model can include the following beneficial effects:

[0046] (1) Conventional laboratory ore heap leaching columns often suffer from problems such as uneven solution distribution, insufficient diffusion of the leachate, and inadequate dissolved oxygen replenishment. This invention is based on the dissolution and leaching effect of the leachate on the useful components in the ore. During the leaching process, the leachate is evenly dripped into the ore layer through a solution distribution system and permeates through the gaps between ore particles. As the leachate permeates and diffuses, the useful components in the ore are gradually dissolved and transferred into the solution. After leaching, the valuable solution is extracted through a collection cone for subsequent processing and analysis.

[0047] (2) The spiral distribution of the leaching system in this invention increases the contact area and contact time between the leachate and the ore, which is beneficial for the full progress of the heap leaching reaction. The leachate enters the leaching pipe through a peristaltic pump or gravity, and flows in a spiral shape, dripping evenly onto the ore surface through the outlet holes distributed on the leaching pipe, ensuring that the leachate can drip evenly and stably into the ore pile. In addition, the leaching system can be connected to an aeration pump to supplement dissolved oxygen into the leachate when needed, thereby increasing the reaction rate.

[0048] (3) The liquid collecting cone of this utility model is funnel-shaped and is used to collect the leaching solution and discharge it from the drain pipe below. The funnel-shaped liquid collecting cone can make the leaching solution flow out quickly and be collected, reducing the residence time of the leaching solution in the ore-free part at the bottom of the ore pile leaching column.

[0049] (4) The ore heap leaching column of this utility model has a simple structure, is easy to manufacture and operate. The ore heap leaching column and all its components are preferably made of plexiglass material, which can ensure that the heap leaching column will not deform during the heap leaching test. At the same time, the plexiglass material will not react with the leaching solution and affect the heap leaching test. It has good visibility and is convenient to observe the changes in the leaching process.

[0050] (5) The ore heap leaching column of this utility model is widely used in the field of ore leaching technology in mining engineering and chemical engineering. It can be used for laboratory-scale heap leaching tests to simulate and test the leaching performance and process conditions of different ores. At the same time, the ore heap leaching column can also be used for industrial-scale heap leaching production simulation practice, providing technical support and guidance for ore mining and processing. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of the ore heap leaching column of this utility model.

[0052] The attached figures are labeled as follows:

[0053] 1—Heap leaching chamber;

[0054] 2—Lower filter plate;

[0055] 3—Collecting cone;

[0056] 4—Distribution pipe;

[0057] 5—Upper interface;

[0058] 6—Reaction Zone;

[0059] 7—Upper filter plate;

[0060] 8——Drain pipe;

[0061] 9—Inverted cone support at the bottom of the liquid collecting cone. Detailed Implementation

[0062] The following description and accompanying drawings fully illustrate specific embodiments of the present invention to enable those skilled in the art to practice them. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of embodiments of the present invention includes the entire scope of the claims and all available equivalents thereof. In this document, each embodiment may be referred to individually or collectively by the term "utility model," which is merely for convenience and, if more than one utility model is disclosed, is not intended to automatically limit the scope of the application to any single utility model or utility model concept. Relational terms such as "first" and "second" are used herein only to distinguish one entity or operation from another, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed. The various embodiments in this document are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the structures, products, etc., disclosed in the embodiments, since they correspond to the disclosed parts, the descriptions are relatively simple; relevant details can be found in the method section.

[0063] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0064] Example 1

[0065] like Figure 1As shown, this utility model provides a laboratory heap leaching column for ore. The heap leaching column includes a heap leaching chamber 1, a lower filter plate 2, and a collection cone 3, all connected from top to bottom. The heap leaching chamber 1 is used to allow the ore and leaching solution to undergo a chemical reaction during the heap leaching test to extract the target metal. The lower filter plate 2 is used to support the ore heap and filter impurities in the leached solution. The collection cone 3 is used to collect the leached solution.

[0066] The heap leaching chamber 1 is equipped with a solution distribution system, which is used to uniformly penetrate and diffuse the leachate into the ore heap and to replenish dissolved oxygen during intervals in the heap leaching test.

[0067] The liquid distribution system includes liquid distribution pipes 4 that are closely attached to the inner wall of the heap leaching chamber 1 and distributed in a spiral shape. The liquid distribution pipes 4 are provided with liquid outlet holes to discharge leachate and air.

[0068] Furthermore, the size of the ore heap leaching column is usually determined based on the amount of ore piled up, the required amount of leaching solution, and the required leaching efficiency.

[0069] More specifically, the ore heap leaching column is cylindrical with an inner diameter of 150 mm, a wall thickness of 10 mm, an outer diameter of 170 mm, and a height of 850 mm.

[0070] Furthermore, the leaching system also includes a peristaltic pump or an aeration pump connected to the upper interface 5 of the leaching pipe, which ensures control of the leachate flow rate and a stable supply of dissolved oxygen. The peristaltic pump can precisely control the flow rate and pressure of the leachate, ensuring that the leachate is evenly distributed into the ore pile through the leaching pipe. The aeration pump replenishes dissolved oxygen to the leachate during intervals in the heap leaching test, thereby increasing the reaction rate.

[0071] Furthermore, the liquid distribution pipe 4 is made of a corrosion-resistant, high-strength, and easy-to-process material, such as any of acrylic glass or plastic, which can ensure the long-term stable operation of the liquid distribution pipe 4.

[0072] Furthermore, the upper end of the liquid distribution pipe is fixed to the upper end face of the heap leaching chamber 1, and the lower end of the liquid distribution pipe 4 is fixed to the inner wall of the heap leaching chamber 1 8-15mm above the lower filter plate 2. The liquid distribution pipe starts from the upper end face of the heap leaching chamber 1 and is distributed in a spiral shape of 20-40°, extending downward to the upper part of the lower filter plate 2.

[0073] More specifically, the liquid distribution pipe 4 is closely attached to the inner wall of the heap leaching chamber 1 and is distributed in a 30° spiral shape from top to bottom throughout the entire inner cavity of the heap leaching chamber 1.

[0074] Furthermore, the lower end of the liquid distribution pipe 4 is in a closed state and is fixed to the inner wall of the heap leaching chamber 1 by welding or bonding to prevent the leaching solution from leaking and the ore particles from entering the interior of the liquid distribution pipe 4.

[0075] More specifically, the lower end of the liquid distribution pipe 4 has a sealing structure, such as any one of a sealing ring, sealant, etc.

[0076] Furthermore, when the distribution pipe 4 is spirally distributed in the heap leaching chamber 1, it is divided into several segments. The two ends of each distribution pipe 4 are fixed to the inner wall of the heap leaching chamber 1 by welding, bonding or snapping to prevent the distribution pipe 4 from loosening or falling off during the heap leaching test. The angle between each distribution pipe 4 and the horizontal line is 20-40°. The two adjacent distribution pipes 4 divide the heap leaching chamber 1 into several reaction zones 6, so that the ore piles in the reaction zones 6 at different heights can fully contact the leachate permeating from the distribution pipe 4 above, increasing the contact area and contact time between the leachate and the ore.

[0077] More specifically, when the height of the ore heap leaching column is 850 mm, the inner diameter is 150 mm, and the angle between each section of the liquid distribution pipe 4 and the horizontal line is 30°, the heap leaching chamber 1 is divided into 10-12 reaction zones 6, thereby better achieving uniform distribution of the leaching solution in the ore heap and efficient leaching.

[0078] Furthermore, the liquid distribution pipe 4 has an inner diameter of 10 mm, a wall thickness of 2 mm, and an outer diameter of 14 mm, which can provide appropriate flow rate and pressure.

[0079] Furthermore, when the length of each section of the liquid distribution pipe 4 is L, outlet holes are opened at intervals of L / 15 to L / 10. The number of outlet holes opened on each section of the liquid distribution pipe 4 should be appropriate. On the one hand, this avoids the accumulation of leachate in the liquid distribution pipe 4 due to too few outlet holes, thus ensuring the continuity and stability of leachate discharge. On the other hand, it ensures the uniform distribution of leachate on the liquid distribution pipe 4, while avoiding flow dispersion caused by too many outlet holes.

[0080] More specifically, when the height of the ore heap leaching column is 850 mm, the inner diameter is 150 mm, and the angle between each section of the liquid distribution pipe 4 and the horizontal line is 30°, a liquid outlet hole is opened every 12-18 mm, preferably 15 mm, on each section of the liquid distribution pipe 4 for the discharge of leachate and air from the liquid distribution pipe 4.

[0081] Furthermore, the shape of the outlet hole can be circular or elliptical to ensure that the leachate can flow out smoothly and reduce the risk of blockage; the shape of the outlet hole can also be oblique or conical to reduce the impact of the fluid on the ore pile and improve leaching efficiency.

[0082] Furthermore, the size of the effluent outlet hole is adjusted according to the characteristics of the ore pile and the requirements of the leachate, and is usually 2-4 mm.

[0083] Furthermore, the arrangement of the outlet holes on each liquid distribution pipe 4 can be any one of the following: linear arrangement, staggered arrangement, or spiral arrangement.

[0084] Furthermore, to prevent the liquid outlet from being blocked by ore particles or impurities, a filtration structure, such as a filter screen or filter cloth, is installed at the outlet.

[0085] Furthermore, the filter pore size of the lower filter plate 2 is 9-10mm.

[0086] Furthermore, the filter holes of the lower filter plate 2 are circular or elliptical with a diameter of 146-149 mm to ensure that they are not easily clogged by mineral particles during long-term use.

[0087] Furthermore, the lower filter plate 2 is made of corrosion-resistant, high-strength, and easy-to-process materials, such as plastic or plexiglass.

[0088] Furthermore, the surface of the lower filter plate 2 is covered with filter cloth or filter screen, which can further filter out ore particles and impurities in the leachate, ensuring the purity of the leachate and preventing impurities from interfering with subsequent processing.

[0089] Furthermore, the lower filter plate 2 is provided with reinforcing ribs or supporting structures to enhance its load-bearing capacity and prevent deformation or damage during long-term use.

[0090] Furthermore, the lower filter plate 2 has a detachable and easy-to-clean structure, which prevents the accumulation of impurities and clogging of filter holes over a long period of time, and facilitates regular cleaning and maintenance of the lower filter plate 2.

[0091] Furthermore, the ore heap leaching column also includes an upper filter plate 7, which is located below the upper end face of the heap leaching chamber 1, and is used to cover the surface of the ore heap to prevent dust and debris from entering the leaching system during the heap leaching test.

[0092] Furthermore, the liquid collecting cone 3 is located directly below the lower filter plate 2, and the connection method between it and the lower filter plate 2 includes, but is not limited to, flange connection, threaded connection, etc.

[0093] Furthermore, the liquid collecting cone 3 is made of materials that are corrosion-resistant and high-temperature resistant, including plastics, plexiglass, etc.

[0094] Furthermore, the height of the liquid collecting cone 3 is 70 mm, and the cone angle is 45°.

[0095] Furthermore, the bottom center of the collecting cone 3 is connected to a drain pipe 8 for draining the leachate. The connection method between the collecting cone 3 and the drain pipe 8 includes, but is not limited to, any one of the following: integrated connection, welding, flange connection, threaded connection, etc.

[0096] Furthermore, the drain pipe 8 has an inner diameter of 10 mm, a wall thickness of 3 mm, an outer diameter of 16 mm, and a length of 50 mm.

[0097] Furthermore, the ore heap leaching column also includes an inverted cone support 9 at the bottom of the liquid collecting cone 3, the upper part of which is in close contact with the bottom of the liquid collecting cone 3 to support and fix the liquid collecting cone 3.

[0098] Furthermore, the upper part of the inverted cone support 9 at the bottom of the liquid collecting cone is connected to the bottom of the liquid collecting cone 3 by welding or bolting to ensure the firmness and sealing of the connection.

[0099] Furthermore, one side of the inverted cone support 9 at the bottom of the liquid collecting cone is closely attached to the inner wall of the ore heap leaching column, and the other side is separated from the drain pipe 8 by a certain distance and is parallel to the drain pipe 8. The bottom of the inverted cone support 9 at the bottom of the liquid collecting cone and the bottom of the drain pipe 8 are on the same horizontal plane.

[0100] Furthermore, the number of inverted cone supports at the bottom of the liquid collecting cone 3 is 4, and the inverted cone supports at the bottom of each two adjacent liquid collecting cones are set at 90°.

[0101] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A laboratory heap leaching column for ore, characterized in that, The ore heap leaching column includes a heap leaching chamber (1), a lower filter plate (2), and a collection cone (3) connected from top to bottom. The heap leaching chamber (1) is used to allow the ore and leaching solution to undergo a chemical reaction during the heap leaching test to extract the target metal. The lower filter plate (2) is used to support the ore heap and filter impurities in the leached precious solution. The collection cone (3) is used to collect the leached precious solution. The heap leaching chamber (1) is equipped with a liquid distribution system, which is used to uniformly penetrate and diffuse the leaching solution into the ore heap and to replenish dissolved oxygen during the intervals of the heap leaching test. The liquid distribution system includes a liquid distribution pipe (4) that is closely attached to the inner wall of the heap leaching chamber (1) and distributed in a spiral shape. The liquid distribution pipe (4) is provided with a liquid outlet hole to discharge the leachate and air.

2. The ore heap leaching column according to claim 1, characterized in that, The liquid distribution system also includes a peristaltic pump or an air pump connected to the upper interface (5) of the liquid distribution pipe, which can ensure the flow control of the leachate and the stable replenishment of dissolved oxygen.

3. The ore heap leaching column according to claim 1 or 2, characterized in that, The upper end of the liquid distribution pipe is fixed to the upper end face of the heap leaching chamber (1), and the lower end of the liquid distribution pipe (4) is fixed to the inner wall of the heap leaching chamber (1) 8-15mm above the lower filter plate (2). The liquid distribution pipe (4) starts from the upper end face of the heap leaching chamber (1) and is distributed in a spiral shape at 20-40°, extending downward to the upper part of the lower filter plate (2).

4. The ore heap leaching column according to claim 3, characterized in that, The liquid distribution pipe (4) is closely attached to the inner wall of the heap leaching chamber (1) and is distributed in a 30° spiral shape from top to bottom throughout the entire inner cavity of the heap leaching chamber (1).

5. The ore heap leaching column according to claim 4, characterized in that, The lower end of the liquid distribution pipe (4) is closed and is fixed to the inner wall of the heap leaching chamber (1) by welding or bonding to prevent the leaching liquid from leaking and the ore particles from entering the liquid distribution pipe (4).

6. The ore heap leaching column according to claim 5, characterized in that, The liquid distribution pipe (4) is divided into several segments when it is spirally distributed in the heap leaching chamber (1). The two ends of each liquid distribution pipe (4) are fixed to the inner wall of the heap leaching chamber (1) by welding, bonding or snapping to prevent the liquid distribution pipe (4) from loosening or falling off during the heap leaching test. The angle between each liquid distribution pipe (4) and the horizontal line is 20-40°. Two adjacent liquid distribution pipes (4) divide the heap leaching chamber (1) into several reaction zones (6) so that the ore piles in the reaction zones (6) at different heights can fully contact the leaching liquid permeating from the liquid distribution pipe (4) above, increasing the contact area and contact time between the leaching liquid and the ore.

7. The ore heap leaching column according to claim 6, characterized in that, When the height of the ore heap leaching column is 850 mm, the inner diameter is 150 mm, and the angle between each section of the liquid distribution pipe (4) and the horizontal line is 30°, the heap leaching chamber (1) is divided into 10-12 reaction zones (6), thereby better realizing the uniform distribution of the leaching solution in the ore heap and efficient leaching.

8. The ore heap leaching column according to claim 7, characterized in that, When the length of each liquid distribution pipe (4) is L, liquid outlet holes are opened at distances of L / 15 to L / 10.

9. The ore heap leaching column according to claim 8, characterized in that, The arrangement of the outlet holes on each liquid distribution pipe (4) can be any one of the following: linear arrangement, staggered arrangement, or spiral arrangement.

10. The ore heap leaching column according to claim 1, characterized in that, The bottom center of the liquid collecting cone (3) is connected to a drain pipe (8) for draining the leached precious liquid. The connection between the liquid collecting cone (3) and the drain pipe (8) can be any one of the following: integrated connection, welding, flange connection, or threaded connection.

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