A sample preparation processing method suitable for different types of gold ore

Abstract

The application discloses a sample preparation processing method suitable for different types of gold ores, which comprises the following steps: crushing a gold ore sample in different ways in sequence, mixing the crushed ore particles, and dividing the mixed ore particles into a standard sample and at least one sub-sample with the same weight; adjusting the rotating inner diameter of a rod mill and setting the time of the rod mill according to the type of the ore to be processed; and mixing the standard sample after rod milling to obtain an analysis sample based on the set rod milling inner diameter and time.

Description

Technical Field

[0001] This invention relates to the field of ore processing technology, and specifically to a sample preparation and processing method applicable to different types of gold ore. Background Technology

[0002] Gold has a low abundance in the Earth's crust and is distributed very unevenly. It also has unique physical and chemical properties. Therefore, gold processing and testing is a complex task. With the increasing sophistication of testing instruments, the factors affecting the analysis results of gold ore samples are now mainly concentrated on sample processing. If the sample preparation is not up to standard, the analysis results will lose their representativeness.

[0003] Gold ore contains coarse-grained, medium-grained, and fine-grained gold, with varying amounts of gold embedded within different types of ore. Currently, gold ore sample preparation and processing typically involves crushing different types of ore according to fixed parameters. However, different types of gold ore possess different physical properties, and the particle size distribution varies depending on the type of gold grain. Therefore, insufficient crushing can lead to substandard samples and affect analytical results. Conversely, while excessive crushing may have a smaller impact on analytical results, it increases processing time and production costs.

[0004] Therefore, existing gold ore sample preparation and processing methods are difficult to use to quickly produce qualified samples because it is hard to adjust the processing parameters according to different types of gold ore. Summary of the Invention

[0005] The purpose of this invention is to provide a sample preparation and processing method applicable to different types of gold ore, so as to solve the technical problem in the prior art that it is difficult to adjust the processing parameters according to different types of gold ore to quickly produce qualified samples.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] A sample preparation and processing method applicable to different types of gold ore includes the following steps:

[0008] Step 100: After crushing the original gold ore sample in different ways step by step, mix the crushed ore particles evenly, and divide the mixed ore particles into a positive sample and at least one auxiliary sample of the same weight.

[0009] Step 200: Adjust the inner diameter of the rod mill and set the milling time according to the type of ore to be processed;

[0010] Step 300: Based on the set inner diameter and grinding time of the rod mill, grind the positive sample and mix it to obtain the analytical sample.

[0011] As a preferred embodiment of the present invention, in step 100, the different crushing methods are successively divided into jaw crushing, roller crushing and grinding disc crushing, and the output particle diameter of grinding disc crushing is smaller than that of roller crushing, and the output particle diameter of roller crushing is smaller than that of jaw crushing.

[0012] As a preferred embodiment of the present invention, in step 100, the specific steps of mixing, weighing, and reducing the ore particles are as follows:

[0013] Collect the crushed ore particles, mix the ore particles in a mixer, and weigh them to obtain the total weight of the ore particles.

[0014] Based on the total weight of the ore particles, and according to the required weight of the main sample and the sub-sample, the ore particles are reduced to one main sample and at least one sub-sample of equal weight.

[0015] As a preferred embodiment of the present invention, in step 200, the specific method for adjusting the rotating inner diameter of the rod mill is as follows:

[0016] Determine the inner diameter of the rotating rod mill based on the type of ore being processed;

[0017] Based on the required inner diameter of the rotating rod mill, a corresponding number of multi-stage grinding cylinders are radially extracted;

[0018] The extracted multi-stage grinding cylinder is fixed and sealed to ensure that the grinding area reaches the corresponding rotational inner diameter.

[0019] In a preferred embodiment of the present invention, the process of processing the normal sample into an analytical sample is achieved by a rod milling device, the rod milling device comprising:

[0020] An outer grinding cylinder, one end of which is provided with an inlet / outlet cover;

[0021] A multi-stage inner grinding cylinder is coaxially and slidably disposed at the other end of the outer grinding cylinder. The multi-stage inner grinding cylinder includes multiple sub-cylinders with gradually decreasing diameters and coaxially and slidably nested together, so as to change the inner diameter of the rod mill by adjusting the number of sub-cylinders inside the outer grinding cylinder.

[0022] A sealing column is slidably disposed coaxially at the outer end of the multi-stage internal grinding cylinder. A cover plate is provided at the outer end of the sealing column. The cover plate is connected to the outer ends of the multiple sub-cylinders through a rotary buckle structure so that the cover plate can be locked and unlocked with a single sub-cylinder by rotation.

[0023] A rod mill base is provided to support the outer grinding cylinder. A driver is provided on the rod mill base to drive the outer grinding cylinder to rotate at a set speed and a set time.

[0024] The outer grinding cylinder and the multi-stage inner grinding cylinder together form a variable-diameter rod grinding cavity, and several metal rods are placed axially inside the rod grinding cavity.

[0025] As a preferred embodiment of the present invention, the inner wall of the outer grinding cylinder and the inner walls of the plurality of sub-cylinders are provided with a grinding layer, and the outer walls of the plurality of sub-cylinders and the outer wall of the sealing column are provided with a fluff layer that abuts against the grinding layer.

[0026] In a preferred embodiment of the present invention, an outer ring is provided at the end of the outer grinding cylinder away from the inlet / outlet cover. The outer diameter of the outer ring is equal to the outer diameter of the outer grinding cylinder, and the inner diameter of the outer ring is smaller than the inner diameter of the outer grinding cylinder.

[0027] The outer end of the sub-cylinder is provided with an inner cylinder ring, the outer diameter of the inner cylinder ring is equal to the outer diameter of the sub-cylinder, and the inner diameter of the inner cylinder ring is smaller than the inner diameter of the inner cylinder ring.

[0028] The outer and inner rings form gaps between the sub-cylinders and the outer ring, as well as between two adjacent sub-cylinders, to accommodate the pile layer.

[0029] As a preferred embodiment of the present invention, the outer ring and the inner ring of each of the inner rings are provided with grooves distributed around their axes.

[0030] The outer end peripheral wall of the sealing column and the outer ring wall of each inner cylinder are provided with a retaining strip parallel to its axis. Each retaining strip is slidably engaged in the respective retaining groove so that the outer grinding cylinder drives the multi-stage inner grinding cylinder and the sealing column to rotate synchronously.

[0031] Furthermore, the length of the outer grinding cylinder is equal to the length of each of the sub-cylinders and equal to the length of the sealing column, and each of the locking strips extends to the other end of the corresponding outer grinding cylinder, sub-cylinder, and sealing column.

[0032] As a preferred embodiment of the present invention, the cover plate includes a base plate, the base plate is fixed to the outer end of the sealing post, and a plurality of control rings are rotatably arranged around the axis of the base plate. The plurality of control rings are coaxially arranged and their diameters correspond one-to-one with the plurality of inner cylinder rings.

[0033] Each of the control rings has multiple locking pins distributed around its axis at its inner end, and each of the inner cylinder rings has multiple locking grooves distributed around its axis at its outer end, with each locking pin corresponding to each locking groove.

[0034] The base plate is provided with a plurality of annular grooves for accommodating each of the control rings, and each of the annular grooves is provided with a plurality of sliding openings distributed around its axis. The locking pin passes through the sliding openings and can be inserted into the locking groove.

[0035] As a preferred embodiment of the present invention, a lever is provided at the outer end of each control ring, and the levers are staggered around the axis of the control ring.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] This invention uses a multi-stage crushing method for coarse processing combined with an adjustable rod mill for fine processing. After the original gold ore sample is crushed into ore particles through multi-stage crushing, it is divided into positive and negative samples. The inner diameter and time of the rod mill for processing the positive sample are adjusted according to the type of gold ore, so that the ore particles are quickly processed into qualified analytical samples. Attached Figure Description

[0038] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0039] Figure 1 A schematic flowchart illustrating a sample preparation and processing method applicable to different types of gold ore provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of a rod mill device for sample preparation and processing methods applicable to different types of gold ore provided in an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the cover plate portion of a rod mill apparatus for sample preparation and processing methods applicable to different types of gold ore, provided in an embodiment of the present invention.

[0042] Figure 4 A schematic diagram of the inner cylinder of a rod mill apparatus for sample preparation and processing methods applicable to different types of gold ore, provided in an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the fluff layer structure of a rod mill apparatus for sample preparation and processing methods applicable to different types of gold ore, as provided in an embodiment of the present invention.

[0044] The labels in the diagram represent the following:

[0045] 1-Outer grinding cylinder; 2-Multi-stage inner grinding cylinder; 3-Sealing column; 4-Rod mill base;

[0046] 11-Inlet / outlet cover; 12-Outer cylinder ring; 21-Sub-cylinder; 22-Fluff layer; 23-Inner cylinder ring; 31-Cover plate;

[0047] 231-Slot; 232-Slot bar; 233-Lock slot; 311-Base plate; 312-Control ring; 313-Pin; 314-Annular groove; 315-Slide opening; 316-Lever. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figure 1 As shown, the present invention provides a sample preparation and processing method applicable to different types of gold ore, comprising the following steps:

[0050] Step 100: After crushing the original gold ore sample in different ways step by step, mix the crushed ore particles evenly, and divide the mixed ore particles into a positive sample and at least one auxiliary sample of the same weight.

[0051] Step 200: Adjust the inner diameter of the rod mill and set the milling time according to the type of ore to be processed;

[0052] Step 300: Based on the set inner diameter and grinding time of the rod mill, grind the positive sample and mix it to obtain the analytical sample.

[0053] The sample preparation method of this embodiment mainly utilizes multiple crushing processes. The original gold ore sample is crushed into ore particles through different methods in succession. The ore particles are then mixed and shrunk into a positive sample and at least one auxiliary sample of the same weight. The positive sample is then crushed by a rod mill. Before the rod mill crushing, the inner diameter of the rod mill and the grinding time are adjusted according to the type of ore to improve the crushing effect of the ore particles and obtain analytical sample particles that meet the required specifications and are relatively uniform in size.

[0054] Compared to existing sample preparation methods that use a fixed inner diameter for rod mills, in this embodiment, the gold ore sample is crushed multiple times to obtain ore particles, and then a positive sample is obtained by reducing the particle size. Then, according to the type of gold ore sample, the appropriate inner diameter and grinding time of the rod mill are adjusted so that the positive sample is ground according to the set inner diameter and grinding time, so that the specifications of the produced analytical sample meet the requirements.

[0055] Because the inner diameter of the rod mill can be adjusted, different inner diameters can be adjusted for different gold ore samples to better crush the gold ore samples.

[0056] Furthermore, adjusting the rod mill processing according to the type of ore to be processed is based on sample analysis of different types of gold ore to determine the required particle size for each type. The inner diameter of the rod mill is also designed based on test analysis, thus eliminating the need for processing in different rod mill devices.

[0057] In step 100, the different crushing methods are successively divided into jaw crusher, roller crusher and disc crusher, and the output particle diameter of disc crusher is smaller than that of roller crusher, and the output particle diameter of roller crusher is smaller than that of jaw crusher.

[0058] Jaw crushers, roll crushers, and disc crushers primarily break down gold ore into smaller particles through a step-by-step process. This process utilizes jaw crushers, roll crushers, and disc crushers, respectively. All three types of crushers—jaw crushers, roll crushers, and disc crushers—allow for adjustment of the product size, specifically ensuring that the particle diameter from disc crushing is less than that from roll crushing, which in turn is less than that from jaw crushing. Based on this, the original gold ore sample can be progressively and finely crushed into more uniformly sized particles.

[0059] In step 100, the specific steps of mixing, weighing, and reducing the ore particles are as follows:

[0060] Collect the crushed ore particles, mix the ore particles in a mixer, and weigh them to obtain the total weight of the ore particles.

[0061] Based on the total weight of the ore particles, and according to the required weight of the main sample and the sub-sample, the ore particles are reduced to one main sample and at least one sub-sample of equal weight.

[0062] During this process, the ore particles are mixed to ensure that each part (gold particles and stone particles) is evenly distributed, so that the composition of each sample is similar during the reduction process, which facilitates research and analysis.

[0063] Reduction is a common method for reducing the sample size. It involves weighing the ore particles and calculating the number of particles to be divided into based on the required sample size range. This process divides the mixed ore particles into a primary sample and at least one secondary sample for further analysis.

[0064] Further processing of the sample requires further fine crushing of the ore particles, as detailed below:

[0065] In step 200, the specific method for adjusting the rotating inner diameter of the rod mill is as follows:

[0066] Determine the inner diameter of the rotating rod mill based on the type of ore being processed;

[0067] Based on the required inner diameter of the rotating rod mill, a corresponding number of multi-stage grinding cylinders are radially extracted;

[0068] The extracted multi-stage grinding cylinder is fixed and sealed to ensure that the grinding area reaches the corresponding rotational inner diameter.

[0069] Since different gold ore samples have different physical properties (such as abrasion resistance, brittleness, etc.), when further grinding the ore particles into finer particles, it is necessary to adjust the inner diameter and time of the rod mill according to the type of gold ore sample to obtain analytical sample particles that meet the specifications.

[0070] Specifically, by adjusting the number of multi-stage grinding cylinders used, the inner diameter of the rotating rod mill is changed, thereby allowing the ore particles to be ground within a rod mill space of a suitable inner diameter.

[0071] Based on the above method, as shown in the figure, the process of processing the normal sample into an analytical sample is achieved by a rod mill device, which includes:

[0072] The outer grinding cylinder 1 has an inlet / outlet cover 11 at one end;

[0073] The multi-stage inner grinding cylinder 2 is coaxially and slidably disposed at the other end of the outer grinding cylinder 1. The multi-stage inner grinding cylinder 2 includes multiple sub-cylinders 21, the diameter of the multiple sub-cylinders 21 gradually decreases, and the multiple sub-cylinders 21 are coaxially and slidably nested, so as to change the rotational inner diameter of the rod mill by adjusting the number of sub-cylinders 21 inside the outer grinding cylinder 1.

[0074] The sealing column 3 is coaxially slidably disposed at the outer end of the multi-stage inner grinding cylinder 2. The outer end of the sealing column 3 is provided with a cover plate 31. The cover plate 31 is connected to the outer ends of multiple sub-cylinders 21 through a rotating buckle structure so that the cover plate 31 can be locked and unlocked with a single sub-cylinder 21 by rotation.

[0075] The rod mill base 4 is used to provide support for the outer grinding cylinder 1. The rod mill base 4 is equipped with a driver to drive the outer grinding cylinder 1 to rotate at a set speed and a set time.

[0076] The outer grinding cylinder 1 and the multi-stage inner grinding cylinder 2 together form a variable diameter rod grinding cavity, and several metal rods are placed axially inside the rod grinding cavity.

[0077] In this embodiment, the rod mill device mainly adopts a pull-out adjustment method. The multi-stage inner grinding cylinder 2 is slidably installed at one end of the outer grinding cylinder 1, while the sealing column 3 is slidably inserted to seal the multi-stage inner grinding cylinder 2. Thus, when it is necessary to adjust the inner diameter of the rod mill cavity, a certain number of sub-cylinders 21 are pulled out by the cover plate 31, so that the required number of sub-cylinders 21 are retained in the outer grinding cylinder 1. The thickness of each sub-cylinder 21 is consistent. Thus, the inner diameter of the rod mill cavity can be adjusted according to the number of sub-cylinders 21 retained, so as to adapt to the fine crushing and processing of different gold ores.

[0078] Since the outer grinding cylinder 1 and the multi-stage inner grinding cylinder 2 are adjusted by sliding along the axis, the following preferred embodiments are provided to avoid frictional damage between the outer grinding cylinder 1 and the multi-stage inner grinding cylinder 2, as well as between the sub-cylinders 21 and 21.

[0079] like Figure 2 and Figure 5 As shown, a grinding layer is provided on the inner wall of the outer grinding cylinder 1 and the inner walls of the multiple sub-cylinders 21, while a fluff layer 22 that abuts against the grinding layer is provided on the outer walls of the multiple sub-cylinders 21 and the outer wall of the sealing column 3.

[0080] An outer cylinder ring 12 is provided at the end of the outer grinding cylinder 1 away from the inlet / outlet cover 11. The outer diameter of the outer cylinder ring 12 is equal to the outer diameter of the outer grinding cylinder 1, and the inner diameter of the outer cylinder ring 12 is smaller than the inner diameter of the outer grinding cylinder 1.

[0081] An inner ring 23 is provided at the outer end of the sub-cylinder 21. The outer diameter of the inner ring 23 is equal to the outer diameter of the sub-cylinder 21, and the inner diameter of the inner ring 23 is smaller than the inner diameter of the inner ring 23.

[0082] The outer ring 12 and the inner ring 23 form gaps between the sub-ring 21 and the outer ring 12, as well as between two adjacent sub-rings 21, to accommodate the pile layer 22.

[0083] Specifically, the inner walls of both the outer grinding cylinder 1 and the sub-cylinder 21 are provided with a grinding layer to provide friction to throw up the sample ore particles and metal rods. The fluff layer 22 is provided on the outer walls of the sub-cylinder 21 and the sealing column 3. When the sub-cylinder 21 and the sealing column 3 slide, the fluff layer 22 contacts the grinding layer, thereby effectively reducing wear and preventing ore particles from entering the gap between the sub-cylinder 21 and the outer grinding cylinder 1, the gap between the sealing column 3 and the sub-cylinder 21, and the gap between the sub-cylinders 21.

[0084] Since the outer grinding cylinder 1 is driven to rotate by the driver on the rod grinding base 4, in order to make the sub-cylinder 21 rotate synchronously with the outer grinding cylinder 1, so that rod grinding can be completed when multiple sub-cylinders 21 are used, the following preferred embodiments are provided.

[0085] like Figure 4 As shown, the outer ring 12 and each inner ring 23 are provided with grooves 231 distributed around their axis on the inner ring wall.

[0086] The outer end peripheral wall of the sealing column 3 and the outer ring wall of each inner cylinder 23 are provided with a retaining strip 232 parallel to its axis. Each retaining strip 232 is slidably engaged in each retaining groove 231 so that the outer grinding cylinder 1 drives the multi-stage inner grinding cylinder 2 and the sealing column 3 to rotate synchronously.

[0087] Furthermore, the length of the outer grinding cylinder 1 is equal to the length of each sub-cylinder 21 and equal to the length of the sealing column 3, and each clamping strip 232 extends to the other end of the corresponding outer grinding cylinder 1, sub-cylinder 21 and sealing column 3.

[0088] Specifically, by setting slots 231 on the inner ring walls of the outer ring 12 and each inner ring 23, which cooperate with the locking strips 232 on the outer walls of the inner ring 23 and the sealing column 3, the sub-cylinder 21 is engaged with the outer grinding cylinder 1, the sealing column 3 is engaged with the sub-cylinder 21, and adjacent sub-cylinders 21 are engaged with each other, so that the rotation of the outer grinding cylinder 1 can make multiple sub-cylinders 21 and the sealing column 3 rotate synchronously.

[0089] In order to ensure that the sub-cylinder 21 and the sealing column 31 can remain engaged when they move to the set position within the adjustment range, each locking strip 232 is extended to the other end of the corresponding outer grinding cylinder 1, sub-cylinder 21 and sealing column 3, so that the locking strip 232 is always engaged with the locking groove 231.

[0090] It should be added that the cover plate 31 is supported by a support member that can slide horizontally on the rod mill base 4, and the support member can be locked in any position, thereby limiting the position of the cover plate 31 and the adjustment of the sub-cylinder 21.

[0091] The various sub-cylinders 21 are nested together to form a multi-stage internal grinding cylinder 2. The cover plate 31 can independently engage each sub-cylinder 21, thereby allowing for free selection and adjustment of the number of sub-cylinders 21 to achieve the purpose of adjusting the inner diameter of the grinding chamber. Details are as follows:

[0092] like Figure 2 , Figure 3 and Figure 4 As shown, the cover plate 31 includes a base plate 311, which is fixed to the outer end of the sealing column 3. Multiple control rings 312 are rotatably arranged around the axis of the base plate 311. The multiple control rings 312 are coaxially arranged and their diameters correspond one-to-one with the multiple inner cylinder rings 23.

[0093] Each control ring 312 has multiple locking pins 313 distributed around its axis at its inner end, and each inner cylinder ring 23 has multiple locking grooves 233 distributed around its axis at its outer end, with each locking pin 313 corresponding to each locking groove 233.

[0094] Multiple annular grooves 314 are provided on the base plate 311 to accommodate each control ring 312, and multiple sliding openings 315 are provided in each annular groove 314 to be distributed around its axis. The locking pin 313 passes through the sliding opening 315 and can be inserted into the locking groove 233.

[0095] Each control ring 312 has a lever 316 at its outer end, and the levers 316 are arranged alternately around the axis of the control ring 312.

[0096] After the sealing column 3 is fully inserted into the sub-cylinder 21, the cover plate 31 is against the inner cylinder ring 23, and the locking pin 313 is inserted into the locking groove 233. When a certain number of sub-cylinders 21 need to be moved, the corresponding control ring 312 is rotated, which causes the locking pin 313 to slide along the slide 315 in the locking groove 233 to slide into a narrower space, restricting the movement of the locking pin 313 axis. When the cover plate 31 moves axially, it can drive the corresponding inner cylinder ring 23 and sub-cylinder 21 to move synchronously along their axes, thereby realizing the adjustment of the inner diameter of the rod grinding cavity.

[0097] The lever 316 is used to operate the control ring 312 for locking and unlocking. The multiple levers 316 are arranged in an alternating manner to facilitate operation without interference between them.

[0098] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A sample preparation and processing method applicable to different types of gold ore, characterized in that, Includes the following steps: Step 100: After crushing the original gold ore sample in different ways step by step, mix the crushed ore particles evenly, and divide the mixed ore particles into a positive sample and at least one auxiliary sample of the same weight. Step 200: Adjust the inner diameter of the rod mill and set the milling time according to the type of ore to be processed; Step 300: Based on the set inner diameter and grinding time of the rod mill, the positive sample is ground and mixed to obtain the analytical sample; In step 200, the specific method for adjusting the rotating inner diameter of the rod mill is as follows: Determine the inner diameter of the rotating rod mill based on the type of ore being processed; Based on the required inner diameter of the rotating rod mill, a corresponding number of multi-stage grinding cylinders are radially extracted; The extracted multi-stage grinding cylinder is fixed and sealed to ensure that the rod grinding area reaches the corresponding rotational inner diameter. The process of processing the normal sample into the analytical sample is achieved by a rod milling device, which includes: An outer grinding cylinder, one end of which is provided with an inlet / outlet cover; A multi-stage inner grinding cylinder is coaxially and slidably disposed at the other end of the outer grinding cylinder. The multi-stage inner grinding cylinder includes multiple sub-cylinders with gradually decreasing diameters and coaxially and slidably nested together, so as to change the inner diameter of the rod mill by adjusting the number of sub-cylinders inside the outer grinding cylinder. A sealing column is slidably disposed coaxially at the outer end of the multi-stage internal grinding cylinder. A cover plate is provided at the outer end of the sealing column. The cover plate is connected to the outer ends of the multiple sub-cylinders through a rotary buckle structure so that the cover plate can be locked and unlocked with a single sub-cylinder by rotation. A rod mill base is provided to support the outer grinding cylinder. A driver is provided on the rod mill base to drive the outer grinding cylinder to rotate at a set speed and a set time. The outer grinding cylinder and the multi-stage inner grinding cylinder together form a variable diameter rod grinding cavity, and several metal rods are placed axially inside the rod grinding cavity. The inner wall of the outer grinding cylinder and the inner walls of the plurality of sub-cylinders are provided with a grinding layer, while the outer walls of the plurality of sub-cylinders and the outer wall of the sealing column are provided with a fluff layer that abuts against the grinding layer.

2. The sample preparation and processing method applicable to different types of gold ore according to claim 1, characterized in that, In step 100, the different crushing methods are successively divided into jaw crusher, roller crusher and disc crusher, and the output particle diameter of disc crusher is smaller than that of roller crusher, and the output particle diameter of roller crusher is smaller than that of jaw crusher.

3. The sample preparation and processing method applicable to different types of gold ore according to claim 2, characterized in that, In step 100, the specific steps for mixing, weighing, and reducing the ore particles are as follows: Collect the crushed ore particles, mix the ore particles in a mixer, and weigh them to obtain the total weight of the ore particles. Based on the total weight of the ore particles, and according to the required weight of the main sample and the sub-sample, the ore particles are reduced to one main sample and at least one sub-sample of equal weight.

4. The sample preparation and processing method applicable to different types of gold ore according to claim 1, characterized in that, An outer ring is provided at the end of the outer grinding cylinder away from the inlet / outlet cover. The outer diameter of the outer ring is equal to the outer diameter of the outer grinding cylinder, and the inner diameter of the outer ring is smaller than the inner diameter of the outer grinding cylinder. The outer end of the sub-cylinder is provided with an inner cylinder ring, the outer diameter of the inner cylinder ring is equal to the outer diameter of the sub-cylinder, and the inner diameter of the inner cylinder ring is smaller than the inner diameter of the inner cylinder ring. The outer and inner rings form gaps between the sub-cylinders and the outer ring, as well as between two adjacent sub-cylinders, to accommodate the pile layer.

5. A sample preparation and processing method applicable to different types of gold ore according to claim 4, characterized in that, The outer ring and the inner ring of each inner ring are provided with grooves distributed around their axis. The outer end peripheral wall of the sealing column and the outer ring wall of each inner cylinder are provided with a retaining strip parallel to its axis. Each retaining strip is slidably engaged in the respective retaining groove so that the outer grinding cylinder drives the multi-stage inner grinding cylinder and the sealing column to rotate synchronously. Furthermore, the length of the outer grinding cylinder is equal to the length of each of the sub-cylinders and equal to the length of the sealing column, and each of the locking strips extends to the other end of the corresponding outer grinding cylinder, sub-cylinder, and sealing column.

6. A sample preparation and processing method applicable to different types of gold ore according to claim 5, characterized in that, The cover plate includes a base plate, which is fixed to the outer end of the sealing post. Multiple control rings are rotatably arranged around the axis of the base plate. The multiple control rings are coaxially arranged and their diameters correspond one-to-one with the multiple inner cylinder rings. Each of the control rings has multiple locking pins distributed around its axis at its inner end, and each of the inner cylinder rings has multiple locking grooves distributed around its axis at its outer end, with each locking pin corresponding to each locking groove. The base plate is provided with a plurality of annular grooves for accommodating each of the control rings, and each of the annular grooves is provided with a plurality of sliding openings distributed around its axis. The locking pin passes through the sliding openings and can be inserted into the locking groove.

7. A sample preparation and processing method applicable to different types of gold ore according to claim 6, characterized in that, Each control ring has a lever at its outer end, and the levers are staggered around the axis of the control ring.

Images