Preparation method of multi-metal coarse-grained ore sample

Abstract

The invention relates to a preparation method of a multi-metal coarse-grained ore sample. The preparation method of the multi-metal coarse-grained ore sample comprises the following steps: roasting an ore sample, and pre-screening the roasted sample by adopting a 6-mesh standard sieve; carrying out coarse crushing on the residual materials after pre-screening, and uniformly mixing the crushed materials with the pre-screened materials; carrying out intermediate crushing on the uniformly mixed materials, and feeding the materials subjected to intermediate crushing into a crusher for grinding; and repeatedly and uniformly mixing the ground materials, dividing the uniformly mixed ground materials into a sample amount, grinding the divided materials into 200 meshes through a sealed test sample preparation grinder, and uniformly mixing and bagging the ground materials. According to the scheme provided by the invention, through four links of coarse crushing, intermediate crushing, fine crushing and fine grinding, large-particle-size ore materials are crushed and processed by stages, the particle size of each stage and representativeness of a division sample are ensured, the ore materials are finally processed to the particle size of-200 meshes or below, the qualified rate of preparation of coarse-particle ore samples is increased, and accurate guidance of production is realized.

Description

Technical Field

[0001] The present application relates to the technical field of ore sample preparation, and in particular to a method for preparing a multi-metal coarse-grained ore sample. Background Art

[0002] In the process of mining and recycling of non-ferrous metal minerals, due to the complex geological mineralization conditions, a large amount of low-grade ore and ore-containing waste rock are often produced during mining. If they are directly sent to the concentrator, it will affect the comprehensive economic benefits of the mining enterprise, and directly discarding them will cause a waste of resources. At present, it has become a trend to pre-discard and enrich low-grade ore before entering the concentrator. According to the standards of the geological and mineral industry, the sample preparation particle size is between 0.097mm-0.074mm, and the particle size of the ore pre-discarded material is within the particle size range of -0.037mm~+150mm, involving photoelectric, jigging and other separation processes, with a particle size range of -120mm~+25mm, -25mm~+0.5mm, and the particle size range is large and uneven. In order to complete the processing and preparation of the sample, in the existing process, a jaw crusher is used for coarse and medium crushing, and then finely ground by different crushers and sent to the laboratory for testing, analysis and feedback production.

[0003] In the related technical scheme, the discharge particle size of the first stage jaw crusher is usually controlled by adjusting the size of the feed port and the discharge port to control the minimum discharge particle size to about 6mm; the second stage uses a roller crusher, and its minimum crushing particle size can reach less than 3mm. However, according to the minimum sampling amount to meet the Chechot formula calculation, even if the particle size is controlled below 3mm, the minimum sampling amount for subsequent fine grinding must be more than 5kg, which brings great difficulties to the fine grinding process; if it is less than the minimum sampling amount, it cannot meet the sample representativeness requirements. According to the Chechot formula Q=Kd 2 The reliable mass of the sample is proportional to the square of the maximum particle diameter. The more uneven the material is and the coarser the particles of the sample are, the greater the required reliable weight is. If the sampling volume is reduced only to meet the processing requirements, it is very easy to cause insufficient sample representativeness, large errors, data distortion, and low sample preparation qualification rate defects. Even by reducing work efficiency, the sample preparation qualification rate can only reach about 80% after multiple crushing and grinding, which still cannot truthfully reflect the actual production and guide production control, and indirectly increases the difficulty of sample preparation.

[0004] Therefore, a sample preparation method for polymetallic coarse-grained ores is needed to improve the pass rate of sample preparation. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a method for preparing a polymetallic coarse-grained ore sample, aiming to solve the problem of low qualified rate in the preparation of polymetallic coarse-grained ore samples.

[0006] The first aspect of the present application provides a method for preparing a multi-metal coarse-grained ore sample, comprising:

[0007] The polymetallic ore samples to be tested are baked to make the moisture content of the ore samples less than 3%. The baked samples are pre-screened using a 6-mesh standard sieve to reduce the amount of materials entering the coarse crushing and improve the crushing efficiency;

[0008] The remaining material after pre-screening is coarsely crushed to control the particle size of the material to 3-4mm, and mixed with the pre-screened material;

[0009] The mixed material is crushed to control the particle size of the material below 1.5mm. The material after the crushing is sent to the pulverizer and ground to a particle size of 0.4-0.6mm;

[0010] Repeatedly mix the ground material for 3 times or more, reduce the mixed ground material to the sample requirement, and grind the reduced material to 200 meshes through a sealed test sample preparation grinder to obtain a ground material;

[0011] The ground materials are mixed and bagged to obtain the coarse-grained multi-metal ore sample to be tested.

[0012] Optionally, in some embodiments, the ore sample is roasted, comprising:

[0013] Use a forced air drying oven to bake the ore samples at a temperature of 105°C to keep the moisture content of the ore samples less than 3% to prevent the ore from agglomerating after crushing.

[0014] Optionally, in some embodiments, the material remaining after the pre-screening is coarsely crushed, comprising:

[0015] After pre-screening, materials with a diameter greater than 3mm enter the jaw crusher for coarse crushing, and the coarse crushing particle size of the jaw crusher is controlled at 3-4mm.

[0016] Optionally, in some embodiments, the mixed material is subjected to medium crushing, comprising:

[0017] The mixed materials are sent to the double-roll crusher for secondary crushing, and the particle size of the secondary crushing material is controlled below 1.5mm.

[0018] Optionally, in some embodiments, the medium-crushed material is fed into a pulverizer and ground to a particle size of 0.4-0.6 mm, comprising:

[0019] The medium-crushed material is put into a disc mill for grinding, and the grinding particle size is 0.5 mm.

[0020] Optionally, in some embodiments, repeatedly mixing the ground material 3 times or more comprises:

[0021] Use the cone transfer and cone stacking methods to repeatedly mix the ground material 3 times or more.

[0022] Optionally, in some embodiments, the reduced material is ground to 200 meshes by a sealed sample preparation grinder, comprising:

[0023] Grind it in a sealed sample preparation grinder for 150-200 seconds. After grinding, use a 200-mesh standard sieve to sieve and check to ensure that the material meets the analytical particle size requirement of -200 mesh.

[0024] Optionally, in some embodiments, the method for preparing a multi-metallic coarse-grained ore sample further comprises:

[0025] The materials with a particle size of -200 mesh are mixed and bagged into 3 portions, one of which is used as the positive test sample for laboratory analysis and testing, and the remaining two are retained as backup samples.

[0026] The technical solution provided by this application may have the following beneficial effects:

[0027] By baking out the moisture in ore samples, the problem of samples becoming damp and clumping together during subsequent processing can be reduced. The large-particle ore materials can be crushed and processed in stages through four steps: coarse crushing, medium crushing, fine crushing and fine grinding, ensuring the representativeness of the particle size and reduced samples in each section. The final processing is to a particle size below -200 mesh (0.074mm), solving the problem of insufficient representativeness of samples during coarse-particle reduction, improving the qualified rate of ore sample preparation and achieving accurate guidance for production.

[0028] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0030] Figure 1 It is a schematic diagram of the process of preparing a multi-metal coarse-grained ore sample shown in an embodiment of the present application;

[0031] Figure 2 It is a schematic diagram of the process flow of the method for preparing a multi-metallic coarse-grained ore sample shown in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0033] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the related technical scheme, the discharge particle size of the first stage jaw crusher is usually controlled by adjusting the size of the feed port and the discharge port to control the minimum discharge particle size to about 6mm; the second stage uses a roller crusher, and its minimum crushing particle size can reach less than 3mm. However, according to the minimum sampling amount to meet the Chechot formula calculation, even if the particle size is controlled below 3mm, the minimum sampling amount for subsequent fine grinding must be more than 5kg, which brings great difficulties to the fine grinding process; if it is less than the minimum sampling amount, it cannot meet the sample representativeness requirements. According to the Chechot formula Q=Kd 2The reliable mass of the sample is proportional to the square of the maximum particle diameter. The more uneven the material is and the coarser the particles of the sample are, the greater the required reliable weight is. If the sampling volume is reduced only to meet the processing requirements, it is very easy to cause insufficient sample representativeness, large errors, data distortion, and low sample preparation qualification rate defects. Even by reducing work efficiency, the sample preparation qualification rate can only reach about 80% after multiple crushing and grinding, which still cannot truthfully reflect the actual production and guide production control, and indirectly increases the difficulty of sample preparation.

[0037] In response to the above problems, an embodiment of the present application provides a method for preparing coarse-grained multi-metal ore samples, which can reduce the problem of damp and clumping samples in subsequent processing by baking out the moisture in the ore samples. The large-particle ore materials are crushed and processed in stages through four steps of coarse crushing, medium crushing, fine crushing and fine grinding to ensure the representativeness of the particle size and reduced samples in each section. The final processing is to a particle size below -200 mesh (0.074mm), solving the problem of insufficient representativeness of the samples during coarse-grained reduction, improving the qualified rate of ore sample preparation, and achieving accurate guidance of production.

[0038] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0039] Embodiment 1

[0040] Figure 1 It is a schematic diagram of the process of preparing a multi-metallic coarse-grained ore sample shown in an embodiment of the present application.

[0041] See also Figure 1 , a method for preparing a polymetallic coarse-grained ore sample, comprising:

[0042] S101. Bake the single metal or multi-metal ore sample to make the moisture content of the ore sample less than 3%. The baked sample is pre-screened with a 6-mesh standard sieve to reduce the amount of material entering the coarse crushing and improve the crushing efficiency;

[0043] Specifically, the ore sample is baked, including using a blast drying oven to bake the ore sample at a baking temperature of 105° C. to make the moisture content of the ore sample less than 3% to prevent the ore from agglomerating after being crushed.

[0044] S102, coarsely crushing the material remaining after the pre-screening, controlling the material particle size to 3-4 mm, and mixing it with the pre-screened material;

[0045] Specifically, the remaining materials after pre-screening are coarsely crushed, including the materials with a diameter greater than 3 mm after pre-screening entering the jaw crusher for coarse crushing, and the coarse crushing particle size of the jaw crusher is controlled at 3-4 mm.

[0046] S103, the mixed material is subjected to secondary crushing, and the particle size of the material after the secondary crushing is controlled to be below 1.5 mm, and the material after the secondary crushing is sent to a pulverizer and ground to a particle size of 0.4-0.6 mm;

[0047] Specifically, the mixed material is subjected to secondary crushing, including sending the mixed material into a double-roll crusher for secondary crushing, and the particle size of the secondary crushed material is controlled to be below 1.5 mm.

[0048] Specifically, the medium-crushed material is fed into a pulverizer and ground to a particle size of 0.4-0.6 mm, including the medium-crushed material being fed into a disc pulverizer for grinding to a particle size of 0.5 mm.

[0049] S104, repeatedly mixing the ground material 3 times or more, reducing the mixed ground material to about 250g, and grinding the reduced material to 200 meshes through a sealed test sample preparation grinder to obtain a ground material;

[0050] Specifically, the ground material is repeatedly mixed for 3 times or more, including repeatedly mixing the ground material for 3 times or more using a cone transfer method or a cone stacking method.

[0051] Grind it in a sealed sample preparation grinder for 150-200 seconds. After grinding, use a 200-mesh standard sieve to screen and check to make the material reach the analytical particle size requirement of -200 mesh, and then mix and bag it.

[0052] S105, mixing and bagging the ground materials to obtain a coarse-grained multi-metal ore sample to be tested;

[0053] Specifically, the material with a particle size of -200 mesh is mixed and bagged into three portions, one of which is used as a positive test sample for laboratory analysis and testing, and the remaining two are retained as backup samples.

[0054] Embodiment 2

[0055] Figure 2 It is a specific schematic diagram of the method for preparing a multi-metallic coarse-grained ore sample shown in an embodiment of the present application.

[0056] See also Figure 2 , a method for preparing a polymetallic coarse-grained ore sample, comprising:

[0057] The ore samples were baked in a blast drying oven to ensure that the moisture content was <3% at a drying temperature of 105°C. The samples baked in the blast drying oven were pre-screened using a 6-mesh standard sieve with a sieve diameter of 3 mm.

[0058] Materials larger than 3mm enter the jaw crusher for coarse crushing, and the particle size is controlled at 3-4mm after coarse crushing by the jaw crusher.

[0059] Mix the material that is pre-screened to be less than 3mm by a 6-mesh standard sieve with the material coarsely crushed by a jaw crusher.

[0060] The mixed material enters the double-roll crusher for secondary crushing. After secondary crushing, the discharge particle size is controlled below 1.5mm, and then enters the disc mill for grinding to a particle size of about 0.5mm.

[0061] Use the cone transfer and cone stacking methods to mix repeatedly for more than 3 times. After manual reduction of 250g, enter the sealed laboratory sample preparation grinder for grinding for 150-200S. The remaining material after reduction is retained as the first sample.

[0062] After the grinding is completed by the sealed sample preparation mill, the material is screened with a 200-mesh standard sieve, and the material can reach the analytical particle size requirement of -200 mesh (i.e. 0.074mm);

[0063] Finally, mix and bag the materials. One material is sent to the laboratory as the test sample for analysis and testing, and the remaining material is kept as a secondary backup sample.

[0064] In the traditional sample processing and preparation process, due to the limitations of the equipment, the discharge particle size of the first-stage crushing jaw crusher is controlled by adjusting the size of the feed port and the discharge port, and the minimum discharge particle size reaches about 6mm. The second stage uses a roller crusher, and the minimum crushing particle size can reach less than 3mm, but according to the minimum sampling amount, the Chejot formula Q=kd2 is satisfied, where Q is the reliable weight of the sample / kg, K is the sample processing coefficient, which is determined by the nature of the ore and the uniformity of mineralization. It is generally between 0.05-1.0 after testing, and d is the maximum particle diameter of the sample / mm. Even if the particle size is controlled below 3mm, the minimum sampling amount for subsequent fine grinding processing must be above 5kg, which brings great difficulties to fine grinding processing. If it is lower than the minimum sampling amount, it cannot meet the representativeness requirements of the sample, the error is large, the data is distorted, and the qualified rate of sample preparation is as low as 75%, as shown in Table 1. In addition, by reducing the work efficiency, the qualified rate of sample preparation after multiple crushing and grinding can only reach about 80%, which still cannot truly reflect the actual production and guide production control, and indirectly increases the difficulty of sample preparation.

[0065] Table 1 Statistics of coarse-grained material sample preparation data

[0066]

[0067]

[0068] Through the operation of this application process, the preparation of multiple batches of materials with different particle sizes can be completed, and the qualified rate of the prepared samples can reach more than 95%, which can be increased by 20 percentage points compared with the traditional operation process. The data on the preparation of coarse-grained material samples in this application are shown in Table 2.

[0069] Table 2 Statistics of qualified rate of coarse-grained material sample preparation

[0070]

[0071]

[0072] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing a multi-metal coarse-grained ore sample, characterized in that: include: The polymetallic ore samples to be tested are baked to make the moisture content of the ore samples less than 3%. The baked samples are pre-screened using a 6-mesh standard sieve; The remaining material after pre-screening is coarsely crushed to control the particle size of the material to 3-4mm, and mixed with the pre-screened material; The mixed material is crushed to control the particle size of the material below 1.5mm. The material after the crushing is sent to the pulverizer and ground to a particle size of 0.4-0.6mm; Repeatedly mix the ground material for 3 times or more, reduce the mixed ground material to the sample requirement, and grind the reduced material to 200 meshes through a sealed test sample preparation grinder to obtain a ground material; The ground materials are mixed and bagged to obtain the coarse-grained multi-metal ore sample to be tested.

2. The method for preparing a multi-metallic coarse-grained ore sample according to claim 1, characterized in that: The method of baking the ore sample comprises: Use a forced air drying oven to bake the ore samples at a temperature of 105°C to keep the moisture content of the ore samples less than 3% to prevent the ore from agglomerating after crushing.

3. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: The method of coarsely crushing the remaining materials after the pre-screening comprises: After pre-screening, materials with a diameter greater than 3mm enter the jaw crusher for coarse crushing, and the coarse crushing particle size of the jaw crusher is controlled at 3-4mm.

4. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: The medium crushing of the mixed material comprises: The mixed material is sent to a double-roll crusher for secondary crushing, and the particle size of the secondary crushed material is controlled to be below 1.5 mm.

5. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: The medium-crushed material is fed into a pulverizer and ground to a particle size of 0.4-0.6 mm, including: The medium-crushed material is put into a disc mill for grinding, and the grinding particle size is 0.5 mm.

6. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: The repeatedly mixing and grinding the materials for 3 times or more includes: Use the cone transfer and cone stacking methods to repeatedly mix the ground material 3 times or more.

7. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: The method of grinding the reduced material to 200 meshes by a sealed sample preparation grinder comprises: Grind it in a sealed sample preparation grinder for 150-200 seconds. After grinding, use a 200-mesh standard sieve to sieve and check to ensure that the material meets the analytical particle size requirement of -200 mesh.

8. The method for preparing a multi-metal coarse-grained ore sample according to claim 1, characterized in that: Also includes: The materials with a particle size of -200 mesh are mixed and bagged into 3 portions, one of which is used as the positive test sample for laboratory analysis and testing, and the remaining two are retained as backup samples.

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