Laboratory column immersion method

Abstract

This application provides a laboratory column leaching method, belonging to the field of hydrometallurgical technology. Through rigorous particle size separation and pretreatment steps, this application effectively eliminates the interference of fine-grained materials and coarse gold particles on leaching. Combined with the simulated effect of fine-grained materials being deposited on the surface of deep-leached ore with the leaching agent in a heap leaching process, and the pressure borne by the deep ore, it further simulates the physicochemical conditions of deep ore during heap leaching, more realistically reproducing industrial heap leaching conditions. This allows for accurate assessment of the actual leaching rate of the elements to be recovered in the ore during actual production heap leaching processes, guiding production and providing scientific data support.

Description

Technical Field

[0001] This invention relates to the field of hydrometallurgical technology, specifically to a laboratory column leaching method. Background Technology

[0002] Heap leaching, with its core advantages of low cost, low energy consumption, and simple process, has become a key technology for processing low-grade mineral resources. As an important resource extraction technology, heap leaching has significant advantages. Essentially, this process involves constructing a large "reactor" on a heap, spraying leaching agents through a distribution system, and collecting the precious liquor through a collection system. Compared to traditional pyrometallurgical or hydrometallurgical processes, its infrastructure is simpler, and its operation and maintenance are easier.

[0003] To study heap leaching processes, column leaching experiments are commonly used in laboratories as a simulation method. While column leaching experiments offer advantages such as low cost and high controllability, they also have the following significant drawbacks: 1. Severe distortion of physicochemical conditions: Laboratory experiments struggle to simulate the complex dynamic physicochemical processes in industrial heaps, including temperature gradients, solution evaporation, ore particle compaction, clay expansion, and chemical precipitation (such as passivation layers) that vary with time and space. This leads to distortion of the leaching process and the final leaching endpoint, as the column environment in laboratory experiments is relatively homogeneous, often resulting in an overestimation of the leaching rate and final recovery rate. Furthermore, the pressure and permeability between ores within the leaching column are lower and higher than the actual conditions in a field heap, respectively. 2. Limitations in operation and data extrapolation: The spraying methods, intensities, and cycles in laboratory column leaching differ significantly from those in industrial heaps. When the optimized parameters and kinetic models obtained from experiments are scaled up to industrial scale, their reliability and predictability often decrease. Therefore, conventional column leaching experiments, as preliminary research tools, cannot accurately reflect actual field conditions. Summary of the Invention

[0004] In view of the technical problems existing in the background art, this application provides a laboratory column leaching method, which aims to solve the problem that existing laboratory column leaching experiments are difficult to simulate the leaching conditions in actual heap leaching processes, and the experimental results cannot truly reflect the on-site working conditions.

[0005] This application provides a laboratory column impregnation method, comprising the following steps: S1. Take the sample m1 kg to be tested, crush, mix, and reduce it to obtain sample a and sample b with the same mass; S2. Place the sample a in a heap leaching column and place a pressure plate on top of the sample a to apply pressure; S3. The sample b is sieved to obtain an oversize sample and an undersize sample, with masses of c1 g and c2 g, respectively. S4. The sample over the sieve is ground, and then subjected to a first gravity separation to obtain gravity concentrate 1 and gravity tailings 1. The yield of the first gravity separation is t1. The gold grade of gravity concentrate 1 and gravity tailings 1 is analyzed and found to be e1 g / t and e2 g / t, respectively. Then the gold grade of the sample over the sieve is M1 = t1. e1+(1-t1) e2 g / t; S5. Perform a second gravity separation on the undersize sample to obtain gravity concentrate II and gravity tailings II. The yield of the second gravity separation is t2. Analyze the gold grade of gravity concentrate II and gravity tailings II, which are h1 g / t and h2 g / t, respectively. Then, the gold grade of the undersize sample is M2 = t2. h1+(1-t2) h2 g / t; S6. Calculate the gold grade M of the sample to be tested, then M = [c1 / (c1+c2)] M1 + [c2 / (c1 + c2)] M2 g / t; S7. The gravity separation tailings II are subjected to gold leaching to obtain a gold-leached sample. The gold grade of the gold-leached sample is analyzed to be ng / t. S8. Take m2 g of the gold-leached sample and place it on the pressure plate of the heap leaching column in step S2. Then, perform column leaching treatment on the sample in the heap leaching column to obtain the sample after column leaching. Calculate the yield k of the sample in the heap leaching column; where k is the dry weight ratio of the sample before and after leaching in the heap leaching column. S9. The post-column leaching sample is ground and then subjected to gravity separation to obtain gravity concentrate and gravity tailings. The gravity separation yield is t3. The gold grade of the gravity concentrate and gravity tailings are analyzed and found to be p1 g / t and p2 g / t, respectively. Therefore, the gold grade of the post-column leaching sample is M3 = t3. p1+(1-t3) p2 g / t; S10. Calculate the leaching rate W of the sample to be tested, then W = 1 - [(m1 + m2)] k M3-m2 n] / (M m1).

[0006] In the technical solution of this application embodiment, through rigorous particle size separation and pretreatment steps, the interference of fine-grained materials and coarse gold particles on leaching is effectively eliminated. Through particle size separation and gravity separation analysis, the accuracy of the grade analysis of raw ore and leaching residue is greatly improved, avoiding errors caused by sample inhomogeneity. In addition, by combining the effect of fine-grained materials being piled on the surface of deep leached ore with leaching agents in the simulated heap leaching process and the pressure borne by deep ore, the physicochemical conditions of deep ore in the heap leaching process are further simulated, more realistically restoring industrial heap leaching conditions, accurately evaluating the actual leaching rate of the elements to be recovered in the ore in the actual heap leaching process, and providing scientific data support for guiding production.

[0007] In some embodiments, in step S1, the range of m1 is 50~200, and the particle size of the crushed material is consistent with the actual heap leaching on site.

[0008] In this embodiment, the pretreatment of the heap leaching ore adopts the same process as the on-site heap leaching process to ensure that the original state of the simulated heap leaching sample is consistent.

[0009] In some embodiments, in step S2, the pressure during pressurization is a measured value of the overburden pressure on the ore during actual heap leaching on site.

[0010] In this embodiment, by applying the actual overburden measurement value on the ore in the heap leaching column to the ore, the compaction state of the deep ore in the actual field heap leaching process is simulated, and its permeability to the solution is restored, thereby obtaining leaching kinetics that are more in line with the actual field conditions.

[0011] In some embodiments, in step S2, the pressure plate has uniformly distributed holes.

[0012] In this embodiment, by setting evenly distributed holes on the pressure plate, it is ensured that the subsequent leaching agent can evenly seep into the lower part.

[0013] In some embodiments, in step S3, the aperture of the sieve is 0.001~0.038mm during the sieving process.

[0014] In this embodiment, the fine-particle sample that passes through the sieve simulates the fine-particle material formed during the actual crushing process.

[0015] In some embodiments, in step S7, the leaching agent includes iodine and potassium iodide; the amount of iodine is ≥2.0 kg / t, the amount of potassium iodide is ≥2.0 kg / t, and the leaching time is ≥60 days.

[0016] In this embodiment, the undersize gravity separation tailings are leached by adding an excessive amount of gold leaching agent and sufficient leaching time, simulating the state in which fine-grained materials are fully leached as they flow downward with the leaching agent during the actual field leaching process, and come into full contact with the agent.

[0017] In some embodiments, in step S8, the range of m2 is 80~2980.

[0018] In this embodiment, by placing a certain mass of fully leached fine-grained material on the pressure plate, the effect of fine-grained material being deposited on the surface of the deep leached ore along with the leaching agent during the actual leaching process can be simulated, thereby obtaining leaching kinetics that are more in line with the actual situation on site.

[0019] In some embodiments, step S8 includes the following steps: first, adding sodium hydroxide to adjust the pH to ≥12, treating with alkali for more than 24 hours, then adding sodium cyanide, and leaching for more than 30 days, wherein the amount of sodium cyanide used is ≥1.0 kg / t.

[0020] In this embodiment, the actual leaching process on site is simulated by using the intended leaching agent and process conditions in the column leaching treatment.

[0021] In some embodiments, in step S4, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

[0022] In this embodiment, the gold grade of the sieve sample is accurately analyzed by grinding the sieve sample and further performing gravity separation to eliminate the influence of coarse gold particles.

[0023] In some embodiments, in step S9, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

[0024] In this embodiment, the leached sample is ground and then subjected to gravity separation to eliminate the influence of coarse gold particles and accurately analyze the gold grade of the inlet and outlet samples.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0026] To address the problem that existing laboratory column leaching experiments cannot accurately simulate the leaching conditions in actual heap leaching processes, and that experimental results cannot truly reflect on-site operating conditions, this application provides a laboratory column leaching method. Through rigorous pretreatment steps such as particle size separation and gravity separation, the interference of fine-grained materials and coarse gold particles on leaching is effectively eliminated. Particle size separation and gravity separation analysis significantly improve the accuracy of grade analysis of the raw ore and leaching residue, avoiding errors caused by sample inhomogeneity, and solving the problem of difficult heap leaching evaluation of gold ores rich in fine mud and high clay content. Fine-grained materials were selectively screened and piled onto the surface of the leached ore at a certain weight, effectively simulating the effect of fine-grained materials being piled onto the surface of deep leached ore along with the leaching agent in the heap leaching process. By applying a certain pressure to the leached ore, the compaction state caused by the pressure borne by deep ore in actual field leaching was reproduced, further simulating the physicochemical conditions of deep ore in the heap leaching process, more realistically reproducing industrial heap leaching conditions, and accurately evaluating the actual leaching rate of the elements to be recovered in the ore in the actual heap leaching process, providing scientific data support for guiding production. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0028] Figure 1 This is a flowchart of the laboratory column leaching method in Example 1. Detailed Implementation

[0029] The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] This application provides a laboratory column impregnation method, comprising the following steps: S1. Take the sample m1 kg to be tested, crush, mix, and reduce it to obtain sample a and sample b with the same mass; S2. Place the sample a in a heap leaching column and place a pressure plate on top of the sample a to apply pressure; S3. The sample b is sieved to obtain an oversize sample and an undersize sample, with masses of c1 g and c2 g, respectively. S4. The sample over the sieve is ground, and then subjected to a first gravity separation to obtain gravity concentrate 1 and gravity tailings 1. The yield of the first gravity separation is t1. The gold grade of gravity concentrate 1 and gravity tailings 1 is analyzed and found to be e1 g / t and e2 g / t, respectively. Then the gold grade of the sample over the sieve is M1 = t1. e1+(1-t1) e2 g / t; S5. Perform a second gravity separation on the undersize sample to obtain gravity concentrate II and gravity tailings II. The yield of the second gravity separation is t2. Analyze the gold grade of gravity concentrate II and gravity tailings II, which are h1 g / t and h2 g / t, respectively. Then, the gold grade of the undersize sample is M2 = t2. h1+(1-t2) h2 g / t; S6. Calculate the gold grade M of the sample to be tested, then M = [c1 / (c1+c2)] M1 + [c2 / (c1 + c2)] M2 g / t; S7. The gravity separation tailings II are subjected to gold leaching to obtain a gold-leached sample. The gold grade of the gold-leached sample is analyzed to be ng / t. S8. Take m2 g of the gold-leached sample and place it on the pressure plate of the heap leaching column in step S2. Then, perform column leaching treatment on the sample in the heap leaching column to obtain the sample after column leaching. Calculate the yield k of the sample in the heap leaching column; where k is the dry weight ratio of the sample before and after leaching in the heap leaching column. S9. The post-column leaching sample is ground and then subjected to gravity separation to obtain gravity concentrate and gravity tailings. The gravity separation yield is t3. The gold grade of the gravity concentrate and gravity tailings are analyzed and found to be p1 g / t and p2 g / t, respectively. Therefore, the gold grade of the post-column leaching sample is M3 = t3. p1+(1-t3) p2 g / t; S10. Calculate the leaching rate W of the sample to be tested, then W = 1 - [(m1 + m2)] k M3-m2 n] / (M m1).

[0032] In the technical solution of this application embodiment, through rigorous particle size separation and pretreatment steps, the interference of fine-grained materials and coarse gold particles on leaching is effectively eliminated. Combined with the effect of fine-grained materials being piled on the surface of deep leached ore with leaching agents in the simulated heap leaching process and the pressure borne by the deep ore, the physicochemical conditions of deep ore in the heap leaching process are further simulated, more realistically restoring industrial heap leaching conditions, accurately evaluating the actual leaching rate of the elements to be recovered in the ore in the actual heap leaching process, and providing scientific data support for guiding production.

[0033] Furthermore, in some embodiments, in step S1, the range of m1 is 50~200, and the particle size of the crushed material is consistent with the actual heap leaching on site.

[0034] In the technical solution of this application embodiment, the pretreatment of heap leaching ore adopts the same process as the on-site heap leaching process to ensure that the original state of the simulated heap leaching sample is consistent.

[0035] Furthermore, in some embodiments, in step S2, the pressure during pressurization is a measured value of the overburden pressure on the ore during actual heap leaching on site.

[0036] In the technical solution of this application embodiment, by applying the actual overburden measurement value on the ore in the heap leaching column as in the actual field heap leaching process, the state of deep ore being compacted in the field heap leaching is simulated, and its permeability to the solution is restored, thereby obtaining leaching kinetics that are more in line with the actual field situation.

[0037] Furthermore, in some embodiments, in step S2, the pressure plate has uniformly distributed holes.

[0038] In the technical solution of this application embodiment, by setting uniformly distributed holes on the pressure plate, it is ensured that the subsequent leaching agent can be uniformly leaked to the lower part.

[0039] Furthermore, in some embodiments, in step S3, the sieve aperture is 0.001~0.038mm during the sieving process.

[0040] In the technical solution of this application embodiment, the fine-particle sample that is screened out simulates the fine-particle material formed during the actual crushing process.

[0041] Furthermore, in some embodiments, in step S7, the leaching agent includes iodine and potassium iodide; the amount of iodine used is ≥2.0 kg / t, the amount of potassium iodide used is ≥2.0 kg / t, and the leaching time is ≥60 days.

[0042] In the technical solution of this application embodiment, the undersize gravity separation tailings are leached by adding an excessive amount of gold leaching agent and sufficient leaching time, simulating the state in which fine-grained materials are fully leached in contact with the agent as they flow downward with the leaching agent during the actual field leaching process.

[0043] Furthermore, in some embodiments, in step S8, the range of m2 is 80~2980.

[0044] In the technical solution of this application embodiment, by placing a certain mass of fully leached fine-grained material on the pressure plate, the effect of fine-grained material being piled up on the surface of deep leached ore along with the leaching agent during the actual leaching process can be simulated, thereby obtaining leaching kinetics that are more in line with the actual situation on site.

[0045] Furthermore, in some embodiments, in step S8, the column leaching treatment includes the following steps: first, adding sodium hydroxide to adjust the pH to ≥12, treating with alkali for more than 24 hours, then adding sodium cyanide, leaching for more than 30 days, wherein the amount of sodium cyanide used is ≥1.0 kg / t.

[0046] In the technical solution of this application embodiment, the actual leaching process is simulated by using the intended leaching agent and process conditions in the column leaching treatment.

[0047] Furthermore, in some embodiments, in step S4, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

[0048] In the technical solution of this application embodiment, the sample on the sieve is ground and then subjected to gravity separation to eliminate the influence of coarse gold particles and accurately analyze the gold grade of the sample on the sieve.

[0049] Furthermore, in some embodiments, in step S9, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

[0050] In the technical solution of this application embodiment, the leached sample is ground and then subjected to gravity separation to eliminate the influence of coarse gold particles and accurately analyze the gold grade of the inlet and outlet samples.

[0051] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0052] Example 1 This embodiment provides a laboratory column leaching method, such as... Figure 1As shown, the specific steps include the following: (1) Take 100 kg of ore sample to be heap leaching, crush the sample, control the crushing particle size to be consistent with industrial practice, and mix thoroughly to divide it into sample a and sample b with the same mass.

[0053] (2) The above sample a is loaded into the heap leaching column, and a pressure plate with uniformly distributed holes is placed on the sample, and then a pressure of 185 kPa is applied.

[0054] (3) Sample b was sieved using a sieve with an aperture of 0.01 mm to obtain the sample above the sieve and the sample below the sieve, with masses of c1=47900g and c2=2100g respectively.

[0055] (4) Grind the above-mentioned sieve sample until the grinding fineness is -0.074mm and the content is 90%. Take 5kg of the ground sample and perform gravity separation. The gravity separation yield is t1=0.05%. Analyze the gold grade of the gravity separation concentrate and gravity separation tailings, which are e1=82.20g / t and e2=0.65g / t, respectively. Calculate the gold grade of the sieve sample M1=t1. e1+(1-t1) e2 = 0.05% 82.2+ (1-0.05%) 0.65 = 0.69 g / t.

[0056] (5) Take 2000g of the above undersize sample for gravity separation. The gravity separation yield is t2=0.08%. Analyze the gold grade of the gravity separation concentrate and gravity separation tailings, which are h1=26.11g / t and h2=0.46g / t, respectively. Calculate the gold grade of the undersize sample M2=t2. h1+(1-t2) h2=0.08% 26.11+ (1-0.08%) 0.46 = 0.48 g / t.

[0057] (6) Calculate the gold grade M of the sample to be tested, then M = [c1 / (c1+c2)] M1 + [c2 / (c1 + c2)] M2 = [47900 / (47900+2100)] 0.69 + [2100 / (47900 + 2100)] 0.48 = 0.68 g / t.

[0058] (7) Take 500g of the gravity separation tailings from step (5), add it to 1L of water, add 20g of potassium iodide and 10g of iodine, stir and leach for 3h to obtain the gold-leached sample, and calculate the gold grade of the gold-leached sample n=0.10g / t.

[0059] (8) Take m2=100g of the above gold-leaching sample, put it into the pressure plate of step (1), then add 2500g / t of sodium hydroxide, treat for 24h, then add 1500g / t of sodium cyanide, leach for 60 days, and obtain the column leaching sample. Dry it, weigh it, and calculate the yield of the sample in the heap leaching column k=0.9425.

[0060] (9) The above-mentioned column leaching sample was ground until the grinding fineness was -0.074 mm and the content was 90%. 5 kg of the ground sample was taken and subjected to gravity separation. The gravity separation yield was t3 = 0.06%. The gold grade of the gravity separation concentrate and gravity separation tailings were analyzed and found to be p1 = 35.72 g / t and p2 = 0.25 g / t, respectively. Therefore, the gold grade of the column leaching sample was M3 = t3. p1+(1-t3) p2=0.06% 35.72 + (1 - 0.06%) 0.25 = 0.27 g / t.

[0061] (10) Calculate the leaching rate W of the sample to be tested, then W = 1 - [(m1 + m2)] k M3-m2 n] / (M m1) = 1 - [(50000 + 100) 0.9425 0.27-100 0.10] / (50000 0.68) = 62.53%.

[0062] Based on the comprehensive recovery rate data from the field, the gold leaching rate of the sample was 62.39%, which is close to the 62.53% result of this experiment, proving the accuracy of the experimental results. The gold leaching time of the field sample was more than 365 days, which is a cyclic reaction, and the amount of reagent added was sufficient, resulting in relatively thorough gold leaching. The method in this embodiment can effectively simulate the field leaching conditions in the laboratory, and the test results have practical guiding significance for production.

[0063] Comparative Example 1 This comparative example provides a laboratory column immersion method. Compared with Example 1, the difference is that step (7) is not performed, and the sample after immersion in gold is not added to the pressure plate in step (8). The other steps are roughly the same as in Example 1, and will not be repeated here.

[0064] In this comparative example, the yield of the sample in the heap leaching column was calculated to be k=0.9544; The gold grades of the gravity separation concentrate and tailings are p1 = 19.13 g / t and p2 = 0.21 g / t, respectively. Therefore, the gold grade M3 of the post-column leaching sample is t3. p1+(1-t3) p2=0.06% 19.13 + (1 - 0.06%) 0.21 = 0.22 g / t; To calculate the leaching rate W of the sample to be tested, we have W = 1 - k. M3 / M = 1 - 0.9544 0.22 / 0.68=69.12%.

[0065] The comparison shows that the effect of simulating the actual heap leaching process by not adding fine-grained minerals to cover the surface of the deep leached ore with the leaching agent is not accurate. The experimental result of 69.12% is much higher than the on-site production data of 62.39%.

[0066] Comparative Example 2 This comparative example provides a laboratory column leaching method. Compared with Example 1, the difference is that in step (5), no reselection is performed, and the gold grade is directly tested. In step (7), 500g of the sample from step (5) is taken. Other steps are roughly the same as in Example 1, and will not be repeated here.

[0067] In calculation step (5), the gold grade M2 ​​= 0.73 g / t. To calculate the gold grade M of the sample, we have M = [c1 / (c1+c2)]. M1 + [c2 / (c1 + c2)] M2 = 1 - [47900 / (47900+2100)] 0.69 + [2100 / (47900 + 2100)] 0.73 = 0.69 g / t The gold grade of the sample after immersion is calculated to be n = 0.11 g / t. The yield of the sample in the heap leaching column was calculated to be k=0.9425. The gold grades of the gravity separation concentrate and tailings are p1 = 36.44 g / t and p2 = 0.27 g / t, respectively. Therefore, the gold grade M3 of the post-column leaching sample is t3. p1+(1-t3) p2=0.06% 36.44 + (1 - 0.06%) 0.27 = 0.29 g / t.

[0068] To calculate the leaching rate W of the sample to be tested, we have W = 1 - [(m1 + m2)]. k M3-m2 n] / (M m1) = 1 - [(50000 + 100) 0.9425 0.29-100 0.11] / (50000 0.69) = 60.34%.

[0069] The comparison shows that the gold leaching rate in this comparative example is 60.34%, significantly lower than the 62.39% observed on-site, indicating inaccurate data. This is because gold has a high specific gravity and uneven distribution; without weight separation, the results will be inaccurate. This comparative example only verifies the effect of omitting weight separation in a specific step; if weight separation is omitted in other steps, the data will be even more inaccurate.

[0070] In summary, this application provides a laboratory column leaching method. Through rigorous pretreatment steps such as particle size separation and gravity separation, it effectively eliminates the interference of fine-grained materials and coarse gold particles on leaching. Particle size separation and gravity separation analysis significantly improve the accuracy of grade analysis of the raw ore and leaching residue, avoiding errors caused by sample inhomogeneity and solving the problem of difficult evaluation of heap leaching of gold ores rich in fine mud and high clay content. Fine-grained materials are specifically screened and piled onto the surface of the leached ore at a certain weight, effectively simulating the effect of fine-grained materials being piled onto the surface of deep leached ore with the leaching agent in the heap leaching process. By applying a certain pressure to the leached ore, the compaction state caused by the pressure experienced by deep ore in actual field leaching is reproduced, further simulating the physicochemical conditions of deep ore during heap leaching, more realistically reproducing industrial heap leaching conditions, and accurately evaluating the actual leaching rate of the elements to be recovered in the ore in the actual production heap leaching process, providing scientific data support for guiding production.

[0071] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A laboratory column impregnation method, characterized in that, Includes the following steps: S1. Take the sample m1 kg to be tested, crush, mix, and reduce it to obtain sample a and sample b with the same mass; S2. Place the sample a in a heap leaching column and place a pressure plate on top of the sample a to apply pressure. The pressure plate has evenly distributed holes. S3. The sample b is sieved to obtain an oversize sample and an undersize sample, with masses of c1 g and c2 g, respectively. S4. The sample over the sieve is ground, and then subjected to a first gravity separation to obtain gravity concentrate 1 and gravity tailings 1. The yield of the first gravity separation is t1. The gold grade of gravity concentrate 1 and gravity tailings 1 is analyzed and found to be e1 g / t and e2 g / t, respectively. Then the gold grade of the sample over the sieve is M1 = t1. e1+(1-t1) e2 g / t; S5. Perform a second gravity separation on the undersize sample to obtain gravity concentrate II and gravity tailings II. The yield of the second gravity separation is t2. Analyze the gold grade of gravity concentrate II and gravity tailings II, which are h1 g / t and h2 g / t, respectively. Then, the gold grade of the undersize sample is M2 = t2. h1+(1-t2) h2 g / t; S6. Calculate the gold grade M of the sample to be tested, then M = [c1 / (c1+c2)] M1 + [c2 / (c1 + c2)] M2 g / t; S7. The gravity separation tailings II are subjected to gold leaching to obtain a gold-leached sample. The gold grade of the gold-leached sample is analyzed to be ng / t. S8. Take m2 g of the gold-leached sample and place it on the pressure plate of the heap leaching column in step S2. Then, perform column leaching treatment on the sample in the heap leaching column to obtain the sample after column leaching. Calculate the yield k of the sample in the heap leaching column; where k is the dry weight ratio of the sample before and after leaching in the heap leaching column. S9. The post-column leaching sample is ground and then subjected to gravity separation to obtain gravity concentrate and gravity tailings. The gravity separation yield is t3. The gold grade of the gravity concentrate and gravity tailings are analyzed and found to be p1 g / t and p2 g / t, respectively. Therefore, the gold grade of the post-column leaching sample is M3 = t3. p1+(1-t3) p2 g / t; S10. Calculate the leaching rate W of the sample to be tested, then W = 1 - [(m1 + m2)] k M3-m2 n] / (M m1).

2. The laboratory column immersion method according to claim 1, characterized in that, In step S1, the range of m1 is 50~200, and the particle size of the crushed material is consistent with the actual heap leaching on site.

3. The laboratory column leaching method according to claim 1, characterized in that, In step S2, the pressure during pressurization is the measured value of the overburden pressure on the ore during actual heap leaching on site.

4. The laboratory column immersion method according to claim 1, characterized in that, In step S3, the sieve aperture is 0.001~0.038mm during the sieving process.

5. The laboratory column immersion method according to claim 1, characterized in that, In step S7, the leaching agent includes iodine and potassium iodide; the mass concentration of iodine is ≥1%, the mass concentration of potassium iodide is ≥2%, and the leaching time is ≥3h.

6. The laboratory column leaching method according to claim 1, characterized in that, In step S8, the range of m2 is 80~2980.

7. The laboratory column leaching method according to claim 1, characterized in that, In step S8, the column leaching treatment includes the following steps: first, add sodium hydroxide to adjust the pH to ≥12, treat with alkali for more than 24 hours, then add sodium cyanide and leach for more than 30 days, wherein the amount of sodium cyanide used is ≥1.0 kg / t.

8. The laboratory column leaching method according to claim 1, characterized in that, In step S4, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

9. The laboratory column leaching method according to claim 1, characterized in that, In step S9, the grinding process involves particles with a fineness of -0.074 mm comprising 85-95% of the total particles.

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