Evaluation method of material grindability

Abstract

The application discloses a kind of material easy grinding evaluation method, comprising: obtaining the easy grinding value of material;Under the same test conditions, obtain the easy grinding value of comparative material;Compare the easy grinding value of material and the easy grinding value of comparative material, determine the relative easy grinding of material;Wherein, the easy grinding value of material includes: obtaining the first average particle size of material sample under initial state, and the proportion value of material less than the first average particle size under initial state;Material sample is ground to equilibrium state, obtain the time length of material sample ground to equilibrium state, the second average particle size of material sample under equilibrium state, and the proportion value of material less than the second average particle size under equilibrium state;And further obtain the easy grinding value of material.The material easy grinding evaluation method of the application can more accurately evaluate the relative easy grinding of material.

Description

Technical Field

[0001] This invention relates to the field of material grinding technology, and in particular to a method for evaluating the grindability of materials. Background Technology

[0002] In existing technologies, GB / T26567—2011 "Test Method for Grindability of Cement Raw Materials" provides a method for testing the grindability of materials. However, for cement companies, this method has problems such as requiring specialized grinding equipment, complex experimental procedures, and difficulties in directly applying the results. The key concern for cement companies is to directly and clearly determine whether the grindability of a certain cement raw material exceeds that of the original material, rather than studying the specific energy consumption of that material.

[0003] In response, one technical solution provides a method for evaluating the grindability of materials, which calculates relative grindability without requiring specific equipment for grinding. However, this method suffers from the problem of low accuracy in the relative grindability measurement and calculation results. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for evaluating the grindability of materials, which can more accurately evaluate the relative grindability of materials.

[0005] This invention proposes a method for evaluating the grindability of materials, the method comprising:

[0006] Obtain the grindability value of the material;

[0007] Under the same test conditions, the grindability value of the control material was obtained;

[0008] By comparing the grindability values ​​of individual materials with those of comparative materials, the relative grindability of the materials can be determined.

[0009] The methods for obtaining the grindability value of materials include:

[0010] Obtain the first average particle size of the material sample in its initial state, and the proportion of material in the material sample in its initial state that is smaller than the first average particle size.

[0011] The material sample is ground to equilibrium state, and the time it takes for the material sample to reach equilibrium state is obtained, the second average particle size of the material sample in equilibrium state, and the proportion of material sample in equilibrium state that is smaller than the second average particle size.

[0012] The grindability value of the material is obtained based on the first average particle size of the material sample in its initial state, the proportion of material sample in its initial state that is smaller than the first average particle size, the time it takes for the material sample to be ground to equilibrium, the second average particle size of the material sample in its equilibrium state, and the proportion of material sample in its equilibrium state that is smaller than the second average particle size.

[0013] In some embodiments, obtaining the grindability value of the material based on the first average particle size of the material sample in its initial state, the proportion of material in the material sample in its initial state that is smaller than the first average particle size, the time taken for the material sample to be ground to an equilibrium state, the second average particle size of the material sample in its equilibrium state, and the proportion of material in the material sample in its equilibrium state that is smaller than the second average particle size includes:

[0014] The third average particle size of the material sample in the initial state is obtained based on the proportion of materials smaller than the first average particle size and the first average particle size of the material sample in the initial state.

[0015] The fourth average particle size of the material sample in equilibrium is obtained based on the proportion of material samples smaller than the second average particle size and the second average particle size of the material sample in equilibrium.

[0016] The grindability value of the material is obtained based on the third average particle size of the material sample in the initial state, the fourth average particle size of the material sample in the equilibrium state, and the time taken to grind to the equilibrium state.

[0017] In some embodiments, obtaining the third average particle size of the material sample in the initial state based on the proportion of materials smaller than the first average particle size and the first average particle size of the material sample in the initial state includes: the third average particle size of the material sample in the initial state = R s L s , where L s R is the first average particle size of the material sample in its initial state. s The proportion of material samples in their initial state that are smaller than the first average particle size;

[0018] In some embodiments, obtaining the fourth average particle size of the material sample in equilibrium state based on the proportion of materials smaller than the second average particle size and the second average particle size of the material sample in equilibrium state includes: the fourth average particle size of the material sample in equilibrium state = R t L t , where L t R is the second average particle size of the material sample in equilibrium. tThis refers to the proportion of material samples in equilibrium that are smaller than the second average particle size.

[0019] In some embodiments, obtaining the grindability value of the material based on the third average particle size of the material sample in the initial state, the fourth average particle size of the material sample in the equilibrium state, and the time taken to grind to the equilibrium state includes:

[0020] Grindability value V of the material L How to obtain it: V L = (R) s L s -R t L t ) / t, where L s R is the first average particle size of the material sample in its initial state. s L represents the proportion of material samples in their initial state that are smaller than the first average particle size. t R is the second average particle size of the material sample in equilibrium. t The value of the proportion of material samples in equilibrium that are smaller than the second average particle size is t, where t represents the time required to grind to equilibrium.

[0021] In some embodiments, the step of determining the relative grindability of materials by comparing the grindability values ​​of the materials with those of the control materials includes:

[0022] The relative grindability M of a material is calculated as follows: M = V L1 / V L0 , where V L1 V represents the grindability value of a material. L0 This indicates the grindability value of the material being compared.

[0023] In some embodiments, obtaining the first average particle size of the material sample in its initial state, and the proportion of material in the material sample in its initial state that is smaller than the first average particle size, includes:

[0024] Acquire materials;

[0025] The material is reduced to obtain multiple homogeneous material samples after reduction.

[0026] The particle size of the material sample is measured using a laser particle size analyzer.

[0027] Based on the measurement results, the first average particle size of the material sample in the initial state and the proportion of material in the material sample in the initial state that is smaller than the first average particle size are obtained.

[0028] In some embodiments, the step of grinding the material sample to an equilibrium state, obtaining the time taken to grind the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of material in the material sample in the equilibrium state smaller than the second average particle size includes:

[0029] Each material sample was ground for a different duration;

[0030] The average particle size of each material sample after grinding was measured using a laser particle size analyzer.

[0031] Compare the average particle size of each material sample after grinding with the target particle size. If the ratio meets the preset conditions, the corresponding material sample after grinding is confirmed to be a material sample ground to equilibrium.

[0032] The time taken for the material sample to be ground to equilibrium is taken as the time taken for the material sample to be ground to equilibrium.

[0033] The average particle size of the material sample ground to equilibrium is obtained as the second average particle size of the material sample in equilibrium.

[0034] Based on the laser particle size analyzer measurement results of the material sample ground to equilibrium, the proportion of material samples in equilibrium with a particle size smaller than the second average particle size is obtained.

[0035] In some embodiments, in the step of comparing the average particle size of each material sample after grinding with the target particle size, if the ratio meets the preset condition, then the corresponding ground material sample is confirmed as a material sample ground to equilibrium. If the deviation between the average particle size of each material sample after grinding and the target particle size does not exceed 15%, then the ratio meets the preset condition.

[0036] In some implementations, the target particle size ranges from 2 μm to 200 μm.

[0037] In some embodiments, the target particle size is any one of 4μm, 8μm, 16μm, 32μm, 45μm, 63μm, 80μm, and 125μm.

[0038] The material grindability evaluation method according to the present invention has at least the following beneficial effects: In the process of obtaining the grindability value of the material, the proportion of material sample smaller than the first average particle size in the initial state and the proportion of material sample smaller than the second average particle size in the equilibrium state are introduced. This makes the obtained grindability value of the material affected by the proportion of material sample smaller than the first average particle size in the initial state and the proportion of material sample smaller than the second average particle size in the equilibrium state. This can better reflect the change of material sample smaller than the average particle size in the grinding process. The higher the content of material smaller than the average particle size, the larger the calculated value of particle size change per unit time, and the more obvious the relative grindability comparison will be. Therefore, the obtained grindability value can more accurately evaluate the grindability of the material.

[0039] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0041] Figure 1 This is a schematic flowchart of the material grindability evaluation method according to an embodiment of the present invention;

[0042] Figure 2 This is a flowchart illustrating step S10 of the material grindability evaluation method according to an embodiment of the present invention. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0045] In the description of this invention, "several" means one or more, "multiple" means two or more, "less than," "less than," "more than," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. Where "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0046] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0047] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The existing technical standard GB / T26567—2011, "Test Method for Grindability of Cement Raw Materials," provides a method for testing the grindability of materials. However, for cement companies, this method has problems such as requiring specialized grinding equipment, complex experimental procedures, and difficulties in directly applying the results. The key concern for cement companies is to directly and clearly determine whether the grindability of a certain cement raw material exceeds that of the original material, rather than studying the specific energy consumption of that material.

[0049] One technical solution provides a method for evaluating the grindability of materials, calculating relative grindability without requiring specific equipment for grinding. However, the value used in this method is the average particle size of the material, which cannot fully reflect the actual particle size distribution, thus affecting the accuracy of the measurement results. For example, if the particle size of the material is not uniformly distributed, but rather some particles are larger than others, the measurement results will not fully reflect the ease of grinding the material, leading to low accuracy.

[0050] Please refer to the following for details. Figure 1 and Figure 2 This application provides a method for evaluating the grindability of materials, the method comprising:

[0051] S10. Obtain the grindability value of the material.

[0052] S20. Under the same test conditions, obtain the grindability value of the comparison material.

[0053] The same test conditions here include the selected grinding equipment, the equipment speed during the grinding process, and the grinding time.

[0054] S30. Compare the grindability values ​​of the materials and the grindability values ​​of the comparison materials to determine the relative grindability of the materials.

[0055] The method for obtaining step S10 includes:

[0056] S11. Obtain the first average particle size of the material sample in its initial state, and the proportion of material in the material sample in its initial state that is smaller than the first average particle size. Here, the initial state refers to the state before the material has been ground.

[0057] S12. Grind the material sample to an equilibrium state, obtain the time it takes for the material sample to grind to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of material in the material sample in the equilibrium state that is smaller than the second average particle size.

[0058] It is understood that once the material sample is confirmed to have been ground to an equilibrium state, the duration of the grinding process described above is the time required for the material sample to reach the equilibrium state. The average particle size of the material sample after grinding is the second average particle size of the material sample in the equilibrium state. The ratio of the weight of material smaller than the average particle size in the material sample after grinding to the total weight of the entire material sample is the proportion of material smaller than the second average particle size in the material sample in the equilibrium state.

[0059] S13. The grindability value of the material is obtained based on the first average particle size of the material sample in the initial state, the proportion of material sample in the initial state that is smaller than the first average particle size, the time it takes for the material sample to be ground to equilibrium, the second average particle size of the material sample in the equilibrium state, and the proportion of material sample in the equilibrium state that is smaller than the second average particle size.

[0060] It is understandable that in the process of obtaining the grindability value of a material, the proportion of material samples in the initial state with a particle size smaller than the first average particle size and the proportion of material samples in the equilibrium state with a particle size smaller than the second average particle size are introduced. This makes the obtained grindability value of the material affected by the proportion of material samples in the initial state with a particle size smaller than the first average particle size and the proportion of material samples in the equilibrium state with a particle size smaller than the second average particle size. This can better reflect the changes of material samples with a particle size smaller than the average particle size during grinding. The higher the content of material with a particle size smaller than the average particle size, the larger the calculated value of particle size change per unit time, and the more obvious the relative grindability comparison will be. Therefore, the obtained grindability value can more accurately evaluate the grindability of the material.

[0061] Understandably, common grinding equipment like ball mills primarily pulverize materials through the impact, compression, and friction of grinding media such as steel balls. When the material particles are large, more energy and time are required to break them down to smaller sizes. For example, larger particles may require multiple impacts from steel balls to be broken, while smaller particles are relatively easier to grind to the desired particle size in a shorter time. When the proportion of particles smaller than the average particle size is large, the mill can grind the material to the target particle size more quickly.

[0062] Furthermore, according to Bond's Law and other pulverization theories, the energy required to pulverize materials is directly proportional to the particle size. For example, the energy required to crush a particle with a diameter of 100 micrometers to 50 micrometers is far greater than the energy required to crush a particle with a diameter of 60 micrometers to 50 micrometers. Therefore, when the proportion of particles smaller than the average particle size in the material is large, the mill needs to consume less energy during the grinding process, and the change in particle size per unit time is more significant.

[0063] Furthermore, when the proportion of particles smaller than the average particle size is relatively large, the material flows more smoothly within the mill, allowing for better contact with the grinding media and improving grinding efficiency and grindability. A higher proportion of particles smaller than the average particle size in the material also improves overall heat transfer performance, which is beneficial for the normal operation of the mill, maintaining a better grinding environment and enhancing grindability.

[0064] In some embodiments, step S13 includes:

[0065] S131. Based on the proportion of materials smaller than the first average particle size in the material sample in the initial state and the first average particle size of the material sample in the initial state, the third average particle size of the material sample in the initial state is obtained.

[0066] S132. Based on the proportion of materials in the equilibrium state that are smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state, the fourth average particle size of the material sample in the equilibrium state is obtained.

[0067] S133. The grindability value of the material is obtained based on the third average particle size of the material sample in the initial state, the fourth average particle size of the material sample in the equilibrium state, and the time taken to grind to the equilibrium state.

[0068] Understandably, in obtaining the grindability value of a material, the third average particle size of the initial state material sample is derived from the first average particle size of the initial state material sample and the proportion of material smaller than the first average particle size in the initial state material sample. This means that the obtained third average particle size value of the initial state material sample is affected by the quantity of material smaller than the first average particle size in the material sample. Similarly, the obtained fourth average particle size of the equilibrium state material sample is affected by the quantity of material smaller than the second average particle size in the material sample. Therefore, it can better reflect the changes of material samples smaller than the average particle size during grinding.

[0069] In some embodiments, in step S131, the third average particle size of the material sample in the initial state is obtained based on the proportion of materials smaller than the first average particle size and the first average particle size of the material sample in the initial state, including:

[0070] The third average particle size of the material sample in its initial state = R s L s , where L s R is the first average particle size of the material sample in its initial state. s L represents the proportion of material samples in their initial state that are smaller than the first average particle size. s With R s Multiplying by the first average particle size yields the third average particle size of the material sample in its initial state.

[0071] In some embodiments, in step S132, the fourth average particle size of the material sample in equilibrium state is obtained based on the proportion of materials smaller than the second average particle size in the material sample in equilibrium state and the second average particle size of the material sample in equilibrium state, including:

[0072] The fourth average particle size of the material sample under equilibrium conditions = R t L t , where L t R is the second average particle size of the material sample in equilibrium. t L represents the proportion of material samples in equilibrium with a particle size smaller than the second average particle size. t With R s Multiplying by the result yields the fourth average particle size of the material sample in equilibrium.

[0073] In some embodiments, in step S133:

[0074] Grindability value V of the material L Calculation method for V: L = (R) s Ls -R t L t ) / t, where L s R is the first average particle size of the material sample in its initial state. s L represents the proportion of material samples in their initial state that are smaller than the first average particle size. t R is the second average particle size of the material sample in equilibrium. t The value of the proportion of material samples in equilibrium that are smaller than the second average particle size is t, where t represents the time required to grind to equilibrium.

[0075] It is understandable that the difference between the third average particle size of the material sample in the initial state and the fourth average particle size of the material sample in the equilibrium state, divided by the time it takes for the material sample to be ground to the equilibrium state, yields the grindability value V of the material. L .

[0076] In some embodiments, in step S30:

[0077] The relative grindability M of a material is calculated as follows: M = V L1 / V L0 , where V L1 V represents the grindability value of a material. L0 This indicates the grindability value of the material being compared.

[0078] It is understandable that if the relative grindability M of a material is less than 1, it means that the grindability of the material is better than that of the control material; conversely, if the relative grindability M of a material is less than 1, it means that the grindability of the material is worse than that of the control material. This allows the results of the relative grindability to be presented in a simple way, making them easy to record and understand.

[0079] In some embodiments, step S11 includes:

[0080] S111, Obtain materials.

[0081] S112. Reduce the material to obtain multiple uniform material samples after reduction.

[0082] The material reduction process involves placing the material in an automatic sampler, which then reduces the material to obtain multiple uniform material samples for subsequent grinding.

[0083] S113. Use a laser particle size analyzer to measure the particle size of the material sample.

[0084] Since the above material sample is a homogeneous material sample obtained by reduction, any material sample can be selected to measure the particle size using a laser particle size analyzer.

[0085] Understandably, since the ground material sample includes some relatively large particles, it is necessary to separate these particles first, and then measure the relatively smaller particles after separation. This separation can be achieved through sieve filtration. In other words, the first average particle size of the material sample in its initial state and the second average particle size of the material sample in its equilibrium state are both the average particle size of the relatively smaller particles after separation.

[0086] It should be noted that the relevant technologies use the specific surface area method to obtain material sample data and compare grindability. This method is affected by material density and porosity, making it impossible to measure a highly accurate specific surface area. Furthermore, this method only compares the specific surface area of ​​the ground material and standard sand, neglecting the specific surface area of ​​both before grinding. This comparison may introduce significant errors. If the specific surface area of ​​the material and standard sand before grinding is guaranteed to be consistent, only a single particle size can be screened; otherwise, it is difficult to accurately measure the initial specific surface area of ​​the material. However, grinding a single particle size cannot fully reflect the material's grindability.

[0087] Laser particle size analyzers are used to measure the particle size of material samples. This allows for a wider range of target particle sizes to be selected, without being limited by the initial particle size of the material. It also enables a broader range of particle sizes to be tested and a comprehensive evaluation of the change from the initial particle size to the target particle size, thus providing a more comprehensive assessment of the fineness of the material.

[0088] S114. Based on the measurement results, obtain the first average particle size of the material sample in the initial state, and the proportion of material in the material sample in the initial state that is smaller than the first average particle size.

[0089] In some embodiments, when it is necessary to evaluate the grindability of lumpy materials such as ore, step S111 includes:

[0090] S1111, Obtain block material.

[0091] S1112. The block material is crushed, and the crushed material smaller than the first preset particle size is taken as the raw material. It can be understood that the value of the first preset particle size is constrained by the target particle size. Among them, a jaw crusher can be used for crushing. The crushing particle size of the material can be controlled by adjusting the spacing of the jaw plates. The operation of the jaw crusher is simple and convenient.

[0092] In some embodiments, step S12 includes:

[0093] S121. Grind each material sample for different durations. It is understood that the grinding time for each material sample can be equal. For example, take three material samples and grind them for 5 minutes, 10 minutes, and 15 minutes respectively.

[0094] S122. The average particle size of each ground material sample is obtained by measuring it using a laser particle size analyzer. It is understood that each material sample can be ground sequentially using the same grinding equipment, and then the laser particle size analyzer can be used to measure the particle size of each ground material sample sequentially.

[0095] S123. Compare the average particle size of each material sample after grinding with the target particle size. If the ratio meets the preset conditions, then confirm that the corresponding material sample after grinding is a material sample ground to equilibrium.

[0096] S124. Obtain the time corresponding to the material sample being ground to equilibrium state, and use it as the time for the material sample to be ground to equilibrium state.

[0097] S125. Obtain the average particle size of the material sample ground to equilibrium state, and use it as the second average particle size of the material sample in equilibrium state.

[0098] S126. Based on the laser particle size analyzer measurement results of the material sample ground to equilibrium state, obtain the proportion of material samples in equilibrium state that are smaller than the second average particle size.

[0099] It is understood that in the above embodiment, steps S124, S125, and S126 are not in any particular order.

[0100] In some embodiments, in step S123, if the deviation between the average particle size of the ground material sample and the target particle size does not exceed 15%, then the ratio meets the preset condition. That is, the average particle size of the ground material sample is the numerator, and the target particle size is the denominator. If the ratio is in the range of 0.85-1.15, then the ratio meets the preset condition.

[0101] Understandably, when more accurate information about the grindability of materials is needed, the grinding time of different material samples can be shortened to increase the amount of data obtained when the grinding reaches equilibrium, thus avoiding random errors caused by uneven distribution of a single material.

[0102] It should be noted that using a laser particle size analyzer to measure the particle size of a material sample is not limited by the initial particle size of the material, allowing for a wider range of target particle sizes. In some embodiments, the target particle size ranges from 2 μm to 200 μm.

[0103] In some embodiments, the target particle size is any one of 4μm, 8μm, 16μm, 32μm, 45μm, 63μm, 80μm, and 125μm.

[0104] In other embodiments, step S11 includes:

[0105] S111a, Obtain material samples.

[0106] S112a. The particle size of the material is measured using a laser particle size analyzer.

[0107] S113a. Based on the measurement results, obtain the first average particle size of the material sample in the initial state, and the proportion of material in the material sample in the initial state that is smaller than the first average particle size.

[0108] In some embodiments, step S12 includes:

[0109] S121a. Grind the material sample.

[0110] S122a. Samples are taken at each preset grinding time, and the particle size of the sampled material is measured using a laser particle size analyzer to obtain the average particle size of the sampled material.

[0111] S123a. Compare the average particle size of the sampled material with the target particle size. If the ratio does not meet the preset conditions, send the sampled material back to the grinding equipment and continue grinding until the ratio meets the preset conditions, and confirm that the material sample has been ground to a balanced state.

[0112] S124a. Obtain the time corresponding to the material sample being ground to equilibrium state, and use it as the time for the material sample to be ground to equilibrium state.

[0113] S125a. Obtain the average particle size corresponding to the material sample ground to equilibrium state, and use it as the second average particle size of the material sample in equilibrium state.

[0114] S126a. Based on the measurement results of the material sample ground to equilibrium, obtain the proportion of material samples in equilibrium that are smaller than the second average particle size.

[0115] It is understood that in the above embodiment, steps S124a, S125a, and S126a are not in any particular order.

[0116] In some embodiments, this application provides a method for evaluating the grindability of materials, including:

[0117] S111, Obtain materials.

[0118] S112. Reduce the material to obtain multiple uniform material samples after reduction.

[0119] S113. Use a laser particle size analyzer to measure the particle size of the material sample.

[0120] S114. Based on the measurement results, obtain the first average particle size of the material sample in the initial state, and the proportion of material in the material sample in the initial state that is smaller than the first average particle size.

[0121] S121. Grind each material sample for different durations.

[0122] S122. Use a laser particle size analyzer to measure the average particle size of each ground material sample to obtain the average particle size of each ground material sample.

[0123] S123. Compare the average particle size of each material sample after grinding with the target particle size. If the deviation between the average particle size of the material sample after grinding and the target particle size does not exceed 15%, the ratio meets the preset condition, and the corresponding material sample after grinding is confirmed to be a material sample ground to equilibrium.

[0124] S124. Obtain the time corresponding to the material sample being ground to equilibrium state, and use it as the time for the material sample to be ground to equilibrium state.

[0125] S125. Obtain the average particle size of the material sample ground to equilibrium state, and use it as the second average particle size of the material sample in equilibrium state.

[0126] S126. Based on the laser particle size analyzer measurement results of the material sample ground to equilibrium state, obtain the proportion of material samples in equilibrium state that are smaller than the second average particle size.

[0127] S133. Calculate and obtain the grindability value of the material, V. L Calculation method for V: L = (R) s L s -R t L t ) / t, where L s R is the first average particle size of the material sample in its initial state. s L represents the proportion of material samples in their initial state that are smaller than the first average particle size. t R is the second average particle size of the material sample in equilibrium. t The value of the proportion of material samples in equilibrium that are smaller than the second average particle size is t, where t represents the time required to grind to equilibrium.

[0128] S20. Under the same test conditions, obtain the grindability value of the comparison material.

[0129] S30. Compare the grindability values ​​of the materials and the relative grindability values ​​of the comparison materials to determine the relative grindability of the materials. The calculation method for the relative grindability M of the material is: M = V L1 / V L0 , where V L1 V represents the grindability value of a material. L0 This indicates the grindability value of the material being compared.

[0130] This application provides standard sample quartz mineral sample 1-batch 1 and standard sample quartz mineral sample 1-batch 2. The two batches of mineral samples were obtained through different crushing methods. The average particle size of the two batches of mineral samples is roughly the same, but the proportion of particles smaller than the average particle size is different. Furthermore, the proportion of particles smaller than the average particle size in batch 2 is greater than the proportion of particles smaller than the average particle size in batch 1.

[0131] Grinding was carried out in a planetary ball mill at high speed (500 r / min).

[0132]

[0133] The data above shows that the average particle size change per unit time for batch 1 ore sample to reach grinding equilibrium was 2.45 μm / min, while that for batch 2 ore sample was 4.47 μm / min. The relative grindability of batch 2 is 1.82 times that of batch 1. This verifies that even for the same type of ore sample with basically the same average particle size, the difference in grindability is very significant. Therefore, judging grindability solely based on the average particle size change per unit time is not very accurate.

[0134] Furthermore, since the average particle size change per unit time for batch 2 ore sample to reach grinding equilibrium was 4.47 μm / min, which was greater than the average particle size change per unit time for batch 1 ore sample to reach grinding equilibrium (2.45 μm / min), and the proportion of particles smaller than the average size in batch 2 ore sample was greater than that in batch 1 ore sample, it can be concluded that ore samples with a higher proportion of particles smaller than the average size will show more significant changes in grindability evaluation. Based on this, incorporating the change in the proportion of particles smaller than the average size per unit time into the grindability evaluation is more accurate and can provide a more precise guidance for material grindability evaluation.

[0135] Furthermore, this application also provides Embodiment 1-A, Embodiment 1-B, Embodiment 2-A, and Embodiment 2-B.

[0136] Example 1-A, Example 1-B: Quartz ore samples No. 1 and No. 2 from Hezhou City, Guangxi Zhuang Autonomous Region were crushed and reduced in size, with each sample weighing 100 grams. A group of samples was randomly selected from the reduced material and placed in a planetary ball mill. The samples were ball-milled for 2, 4, and 6 minutes respectively. After each ball milling time, the material samples were vibrated and sieved, and an equal mass of reduced material samples was added. The particle size of the powder below 200 mesh was then measured. Quartz ore sample 1 was used as the standard sample, and the average particle size change per unit time for different ore samples was statistically analyzed to obtain the relative grindability of different material samples.

[0137] Example 1-A: Particle size change of quartz sample 1 (standard sample) under high speed (500 r / min) conditions in a planetary ball mill.

[0138]

[0139] Example 1-B: Particle size change of quartz sample 2 under high speed (500 r / min) conditions in a planetary ball mill.

[0140]

[0141] Example 2-A, Example 2-B: Quartz ore samples No. 1 and No. 2 from Hezhou City, Guangxi Zhuang Autonomous Region were crushed and reduced in size, with each sample weighing 100 grams. A group of samples was randomly selected from the reduced material and placed in a Bonder ball mill. The samples were ball-milled for 10, 20, and 30 minutes respectively. After each ball milling time, the material samples were vibrated and sieved, and an equal mass of reduced material samples was added. The particle size of the powder below 200 mesh was then measured. Quartz ore sample 1 was used as the standard sample, and the average particle size change per unit time for different ore samples was statistically analyzed to obtain the relative grindability of different material samples.

[0142] Example 2-A: Particle size change of quartz sample 1 (standard sample) under Bonder ball mill speed (70 r / min).

[0143]

[0144] Example 2-B: Particle size change of quartz sample 2 under low speed (70 r / min) conditions in a Bonder ball mill.

[0145]

[0146] In the above embodiments, in the first group of examples, Examples 1-A and 1-B respectively used quartz ore samples No. 1 and No. 2, and were ground using a planetary ball mill at a high speed (500 r / min). In the second group of examples, Examples 2-A and 2-B respectively used quartz ore samples No. 1 and No. 2, and were ground using a Bonder ball mill at a low speed (70 r / min).

[0147] The comparison of the two sets of examples shows that, with the same material sample but different grinding equipment and rotation speed, the relative grindability evaluation method of this application can still provide an accurate evaluation of relative grindability. Therefore, the applicable scenarios of this evaluation method are not limited by the grinding equipment or the rotation speed.

[0148] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A method for evaluating the grindability of a material, characterized by, The method for evaluating the grindability of the material comprises the following steps: obtaining the grindability value of the material; obtaining the grindability value of the comparative material under the same test conditions; comparing the grindability value of the material with the grindability value of the comparative material to determine the relative grindability of the material; wherein the method for obtaining the grindability value of the material comprises the following steps: obtaining the first average particle size of the material sample in the initial state and the proportion of the material smaller than the first average particle size in the initial state; grinding the material sample to the equilibrium state, obtaining the time length for grinding the material sample to the equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material smaller than the second average particle size in the equilibrium state; obtaining the grindability value of the material according to the first average particle size of the material sample in the initial state, the proportion of the material smaller than the first average particle size in the initial state, the time length for grinding the material sample to the equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material smaller than the second average particle size in the equilibrium state; the method for obtaining the grindability value of the material according to the first average particle size of the material sample in the initial state, the proportion of the material smaller than the first average particle size in the initial state, the time length for grinding the material sample to the equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material smaller than the second average particle size in the equilibrium state comprises the following steps: obtaining the third average particle size of the material sample in the initial state according to the proportion of the material smaller than the first average particle size in the initial state and the first average particle size of the material sample in the initial state; obtaining the fourth average particle size of the material sample in the equilibrium state according to the proportion of the material smaller than the second average particle size in the equilibrium state and the second average particle size of the material sample in the equilibrium state; obtaining the grindability value of the material according to the third average particle size of the material sample in the initial state, the fourth average particle size of the material sample in the equilibrium state, and the time length for grinding to the equilibrium state; the method for obtaining the grindability value of the material according to the third average particle size of the material sample in the initial state, the fourth average particle size of the material sample in the equilibrium state, and the time length for grinding to the equilibrium state comprises the following steps: Grindability value V of a material L Method for obtaining V L = (R s L s -R t L t ) / t, wherein L s is the first average particle size of a material sample in an initial state, R s is the proportion of material smaller than the first average particle size of the material sample in the initial state, L t is the second average particle size of the material sample in an equilibrium state, R t is the proportion of material smaller than the second average particle size of the material sample in the equilibrium state, and t represents the duration of grinding to the equilibrium state.

2. The method for evaluating the easiness of grinding of a material according to claim 1, characterized by, in the step of comparing the grindability value of the material with the grindability value of the comparative material to determine the relative grindability of the material, the method comprises the following steps: The method for calculating the relative grindability M of the material: M = V L1 / V L0 , wherein V L1 represents the grindability value of the material, V L0 represents the grindability value of the comparative material.

3. The method for evaluating the easiness of grinding of a material according to claim 1, characterized by, the method for obtaining the first average particle size of the material sample in the initial state and the proportion of the material smaller than the first average particle size in the initial state comprises the following steps: obtaining the material; obtaining multiple uniform material samples after size reduction; measuring the particle size of the material sample by using a laser particle size analyzer; obtaining the first average particle size of the material sample in the initial state and the proportion of the material smaller than the first average particle size in the initial state according to the measurement results.

4. The method for evaluating the easiness of grinding of a material according to claim 3, characterized by, The method comprises the following steps: grinding each of the material samples for different time lengths; measuring each of the ground material samples by using a laser particle size analyzer to obtain the average particle size of each of the ground material samples; comparing the average particle size of each of the ground material samples with a target particle size, and if the ratio of the average particle size of each of the ground material samples to the target particle size meets a preset condition, the corresponding ground material sample is determined as a material sample ground to an equilibrium state; obtaining the time length corresponding to the material sample ground to the equilibrium state as the time length for grinding the material sample to the equilibrium state; obtaining the average particle size corresponding to the material sample ground to the equilibrium state as the second average particle size of the material sample in the equilibrium state; obtaining the material proportion value of the material sample in the equilibrium state smaller than the second average particle size according to the laser particle size analyzer measurement result of the material sample ground to the equilibrium state.

5. The method for evaluating the easiness of grinding of a material according to claim 4, characterized by, In the step of comparing the average particle size of each of the ground material samples with the target particle size, if the deviation of the average particle size of each of the ground material samples from the target particle size is not more than 15%, the ratio meets the preset condition.

6. The method for evaluating the easiness of grinding of a material according to claim 4, characterized by, The target particle size is in the range of 2 μm-200 μm.

7. The method for evaluating the easiness of grinding of a material according to claim 4, characterized by, The target particle size is any one of 4 μm, 8 μm, 16 μm, 32 μm, 45 μm, 63 μm, 80 μm and 125 μm.

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