Evaluation method for grindability of material

Abstract

The invention discloses a method for evaluating the grindability of a material. The method comprises the following steps: acquiring a grindability value of the material; under the same test condition, obtaining the grindability value of the comparison material; comparing the grindability values of the materials and comparing the grindability values of the materials, and determining the relative grindability of the materials; the method for acquiring the grindability value of the material comprises the following steps: acquiring a first average particle size of a material sample in an initial state and a material proportion value of the material sample in the initial state smaller than the first average particle size; grinding the material sample to a balance state, and obtaining the time length of grinding the material sample to the balance state, a second average particle size of the material sample in the balance state, and a material proportion value of the material sample in the balance state smaller than the second average particle size; and the grindability value of the material is further obtained. According to the evaluation method for the grindability of the material, the relative grindability of the material can be more accurately evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of material grinding, and in particular to a method for evaluating the grindability of materials. Background Art

[0002] In the existing technology, 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 special grinding equipment, complicated experimental operation procedures, and difficult direct application of results. The focus of 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 the material.

[0003] In this regard, there is a technical solution that provides a method for evaluating the grindability of materials and calculates the relative grindability. Grinding does not require specific equipment. However, there is a problem that the relative grindability measurement and calculation results are not accurate. Summary of the invention

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

[0005] The present invention provides a method for evaluating the grindability of a material, and the method for evaluating the grindability of a material comprises:

[0006] Get the grindability value of the material;

[0007] Under the same test conditions, obtain the grindability value of the comparison material;

[0008] Compare the grindability values ​​of the materials and the grindability values ​​of the comparison materials to determine the relative grindability of the materials;

[0009] Among them, the method for obtaining the grindability value of the material includes:

[0010] Obtaining a first average particle size of the material sample in an initial state, and a material proportion value of the material sample in the initial state that is smaller than the first average particle size;

[0011] Grind the material sample to an equilibrium state, obtain 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 the material sample in the 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 the initial state, the proportion of the material sample in the initial state that is smaller than the first average particle size, the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size.

[0013] In some embodiments, the grindability value of the material is obtained according to the first average particle size of the material sample in the initial state, the proportion of the material sample in the initial state that is smaller than the first average particle size, the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size, including:

[0014] According to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state, a third average particle size of the material sample in the initial state is obtained;

[0015] According to the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state, a fourth average particle size of the material sample in the equilibrium state is obtained;

[0016] The grindability value of the material is obtained 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 for grinding to the equilibrium state.

[0017] In some embodiments, the method of obtaining the third average particle size of the material sample in the initial state according to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state comprises: the third average particle size of the material sample in the initial state = R s L s , where L s is the first average particle size of the material sample in the initial state, R s is the proportion of the material sample in the initial state that is smaller than the first average particle size;

[0018] In some embodiments, obtaining the fourth average particle size of the material sample at equilibrium according to the material proportion value of the material sample at equilibrium that is smaller than the second average particle size and the second average particle size of the material sample at equilibrium comprises: the fourth average particle size of the material sample at equilibrium = R t L t , where L t is the second average particle size of the material sample in equilibrium, R tIt is the proportion of the material sample in equilibrium that is smaller than the second average particle size.

[0019] In some embodiments, the method of 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 of grinding to the equilibrium state includes:

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

[0021] In some embodiments, in the step of comparing the grindability values ​​of the materials and comparing the grindability values ​​of the materials to determine the relative grindability of the materials:

[0022] Calculation method of relative abrasiveness M of materials: M = V L1 / V L0 , where V L1 Indicates the grindability value of the material, V L0 Indicates the grindability value of the comparison material.

[0023] In some embodiments, the step of obtaining a first average particle size of the material sample in an initial state, and a material proportion value of the material sample in an initial state that is smaller than the first average particle size, comprises:

[0024] Get materials;

[0025] The material is reduced to obtain a plurality of uniform material samples after reduction;

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

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

[0028] In some embodiments, grinding the material sample to an equilibrium state, obtaining the time for grinding the material sample to an equilibrium state, a second average particle size of the material sample in an equilibrium state, and a material proportion value of the material sample in an equilibrium state that is smaller than the second average particle size, includes:

[0029] Grind each material sample for different lengths of time;

[0030] The laser particle size analyzer is used to measure each of the ground material samples to obtain the average particle size of each of the ground material samples;

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

[0032] Obtaining the time corresponding to the material sample being ground to a balanced state as the time for the material sample to be ground to a balanced state;

[0033] Obtaining an average particle size corresponding to the material sample ground to an equilibrium state as a second average particle size of the material sample in an equilibrium state;

[0034] According to the measurement result of the laser particle size analyzer of the material sample ground to the equilibrium state, the material proportion value of the material sample in the equilibrium state that is 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 conditions, then confirming that the corresponding material sample after grinding is a material sample ground to an equilibrium state, if the deviation value 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 conditions.

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

[0037] In some embodiments, 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.

[0038] The method for evaluating the grindability of materials according to the present invention has at least the following beneficial effects: in the process of obtaining the grindability value of the material, the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size are introduced, so that the obtained material grindability value is affected by the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size, which can better reflect the changes of the material sample smaller than the average particle size during grinding, and the higher the material content smaller than the average particle size, the greater the calculated value of the particle size change per unit time, and the more obvious the relative grindability comparison will be, so the obtained grindability value can more accurately evaluate the grindability of the material.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 1 Schematic diagram of the process of the method for evaluating the grindability of materials according to an embodiment of the present invention;

[0042] Figure 2 Schematic diagram of the process of step S10 of the method for evaluating the grindability of materials according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0045] In the description of the present invention, "several" means more than one, "many" means more than two, "less than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] The existing technology 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 special grinding equipment, complicated experimental operation procedures, and difficult direct application of results. The focus of 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 the material.

[0049] There is a technical solution that provides a method for evaluating the grindability of materials, calculating relative grindability, and grinding does not require specific equipment. However, the value used in the calculation of relative grindability is the average value of the material particle size, which cannot fully reflect the distribution of the actual material particle size, thus affecting the accuracy of its measurement results. For example, if the particle size of the material is not evenly distributed, but some are larger and some are smaller, this will make the measurement and calculation results unable to fully reflect the difficulty of material grinding, resulting in low accuracy.

[0050] For this, please refer to Figure 1 and Figure 2 The present application embodiment provides a method for evaluating the grindability of a material, and the method for evaluating the grindability of a material includes:

[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 value of the material and the grindability value of the comparison material to determine the relative grindability of the material.

[0055] The acquisition method of step S10 includes:

[0056] S11, obtaining a first average particle size of the material sample in an initial state, and a material proportion value of the material sample in an initial state that is smaller than the first average particle size. The initial state refers to a state where the material has not yet been ground.

[0057] S12. Grind the material sample to an equilibrium state, obtain 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 the material sample in the equilibrium state that is smaller than the second average particle size.

[0058] It can be understood that, if it is confirmed that the material sample is ground to a balanced state, the duration of the grinding process is the duration of grinding the material sample to a balanced state. The average particle size of the material sample after grinding is the second average particle size of the material sample in a balanced state. The ratio of the weight of the material smaller than the average particle size in the material sample after grinding to the weight of the whole material sample is the proportion of the material sample smaller than the second average particle size in the material sample in a balanced state.

[0059] S13. Obtain 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 sample in the initial state that is smaller than the first average particle size, the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size.

[0060] It can be understood that in the process of obtaining the grindability value of the material, the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size are introduced, so that the obtained material grindability value is affected by the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size, which can better reflect the changes of the material sample smaller than the average particle size during grinding. The higher the material content smaller than the average particle size, the greater the calculated value of the 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] It is understandable that for common grinding equipment such as ball mills, materials are mainly crushed by the impact, extrusion and friction of grinding media such as steel balls. When the material particles are large, more energy and time are required to crush them to a smaller size. For example, larger particles may need to withstand multiple steel ball impacts before they can be broken, while smaller particles are relatively easier to grind to the required 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] At the same time, according to the pulverization theory such as Bond's law, the energy required to pulverize the material is proportional to the size of the particles. For example, the energy required to crush a particle with a diameter of 100 microns to 50 microns is much greater than the energy required to crush a particle with a diameter of 60 microns to 50 microns. 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 the particle size of the material per unit time is more obvious.

[0063] In addition, when the proportion of particles smaller than the average particle size is large, the material flows more smoothly in the mill and can better contact with the grinding media, improving the grinding effect and grindability. When the proportion of particles smaller than the average particle size in the material is large, the overall heat transfer performance will be improved, which is conducive to the normal operation of the mill, can maintain a good grinding environment, and improve grindability.

[0064] In some embodiments, step S13 includes:

[0065] S131. Obtain a third average particle size of the material sample in the initial state according to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state.

[0066] S132. Obtain a fourth average particle size of the material sample in the equilibrium state according to the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state.

[0067] S133. Obtain 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 for grinding to the equilibrium state.

[0068] It can be understood that in the process of obtaining the grindability value of the material, the third average particle size of the material sample in the initial state is obtained based on the first average particle size of the material sample in the initial state and the proportion of the material in the material sample in the initial state that is smaller than the first average particle size. This makes the size of the third average particle size value of the material sample in the initial state obtained be affected by the amount of material in the material sample that is smaller than the first average particle size. Similarly, the size of the fourth average particle size of the material sample in the equilibrium state obtained is affected by the amount of material sample that is smaller than the second average particle size. Therefore, the changes of the material sample smaller than the average particle size during grinding can be better reflected.

[0069] In some embodiments, in step S131, according to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state, obtaining a third average particle size of the material sample in the initial state includes:

[0070] The third average particle size of the material sample in the initial state = R s L s , where L s is the first average particle size of the material sample in the initial state, R s It is the proportion of the material sample in the initial state that is smaller than the first average particle size. s With R s Multiplying by can obtain the third average particle size of the material sample in the initial state.

[0071] In some embodiments, in step S132, according to the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state, obtaining a fourth average particle size of the material sample in the equilibrium state includes:

[0072] The fourth average particle size of the material sample at equilibrium = R t L t , where L t is the second average particle size of the material sample in equilibrium, R t It is the proportion of the material sample in the equilibrium state that is smaller than the second average particle size. t With R s Multiplying by can obtain the fourth average particle size of the material sample in the equilibrium state.

[0073] In some embodiments, in step S133:

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

[0075] It can be understood 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, is used to obtain the grindability value V of the material. L .

[0076] In some embodiments, in step S30:

[0077] Calculation method of relative abrasiveness M of materials: M = V L1 / V L0 , where V L1 Indicates the grindability value of the material, V L0 Indicates the grindability value of the comparison material.

[0078] It can be understood 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 comparative material. On the contrary, 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 comparative material. In this way, the relative grindability result can be presented in a simple way, which is convenient for recording and understanding.

[0079] In some embodiments, the step S11 includes:

[0080] S111. Obtain materials.

[0081] S112, reducing the material to obtain a plurality of uniform material samples after reduction.

[0082] The material reduction process is as follows: placing the material in an automatic sampler, which 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] Among them, since the above material samples are uniform material samples obtained by shrinking, any material sample can be selected to measure the particle size using a laser particle size analyzer.

[0085] It is understandable that, since the material sample after grinding includes some materials with relatively large volume, it is necessary to separate the above materials first, and then measure the materials with relatively small volume after separation. The separation method can be filtering through a sieve. In other words, the first average particle size of the material sample in the initial state and the second average particle size of the material sample in the equilibrium state are both the average particle sizes of the materials with relatively small volume after separation.

[0086] It should be noted that in the related art, the specific surface area method is used to obtain material sample data and compare the grindability. This method is affected by the density of the material and the porosity, and it is impossible to measure a more accurate specific surface area. In addition, this method only compares the specific surface area of ​​the material after grinding and the standard sand, while the specific surface areas of the two before grinding are not taken into account. Such a comparison may introduce a large error. If the specific surface area of ​​the material before grinding is guaranteed to be consistent with that of the standard sand, only materials of a single particle size can be screened out. Otherwise, it is difficult to accurately measure the initial specific surface area of ​​the material. However, the grinding effect of materials of a single particle size is difficult to fully reflect the grindability of the material.

[0087] The particle size of the material sample is measured by a laser particle size analyzer. This can expand the range of target particle size selection space and is not limited by the initial particle size of the material. The particle size range of the tested material is wider, and the change from the initial particle size to the target particle size can be fully evaluated, thereby more comprehensively evaluating the fineness of the material.

[0088] S114. According to the measurement results, obtain a first average particle size of the material sample in the initial state, and a material proportion value of 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 bulk materials such as ore materials, step S111 includes:

[0090] S1111, obtain block material.

[0091] S1112, crushing the block material, and taking the crushed material smaller than the first preset particle size as the material. It can be understood that the value of the first preset particle size is constrained by the target particle size. The crushing can be performed by a jaw crusher, which can control the crushing particle size of the material by adjusting the spacing between the jaw plates, and the operation is simple and convenient.

[0092] In some embodiments, the step S12 includes:

[0093] S121, grinding each material sample for different time periods. It is understandable that the grinding time periods of each material sample can be equally spaced. For example, three material samples are taken and ground for 5 minutes, 10 minutes and 15 minutes respectively.

[0094] S122, using a laser particle size analyzer to measure each of the ground material samples to obtain an average particle size of each of the ground material samples. It is understandable that each of the material samples can be ground in sequence using the same grinding equipment, and then the ground material samples can be measured in sequence using a laser particle size analyzer.

[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, it is confirmed that the corresponding material sample after grinding is a material sample ground to a balanced state.

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

[0097] S125. Obtain an average particle size corresponding to the material sample ground to an equilibrium state as a second average particle size of the material sample in an equilibrium state.

[0098] S126. According to the measurement result of the laser particle size analyzer of the material sample ground to the equilibrium state, the proportion value of the material sample in the equilibrium state that is smaller than the second average particle size is obtained.

[0099] It can be understood that in the above embodiment, steps S124, S125, and S126 are performed in no particular order.

[0100] In some embodiments, in step S123, 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 satisfies the preset condition. That is, the average particle size of the material sample after grinding is the numerator and the target particle size is the denominator. If the ratio is within the range of 0.85-1.15, the ratio satisfies the preset condition.

[0101] It is understandable that when it is necessary to obtain the grindability of materials more accurately, the grinding time of different material samples can be shortened, the amount of data obtained when the grinding equilibrium state is reached can be increased, and accidental errors caused by uneven distribution of a single material can be avoided.

[0102] It should be noted that the use of 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, so that the range of target particle size selection is larger. 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 4 μm, 8 μm, 16 μm, 32 μm, 45 μm, 63 μm, 80 μm, and 125 μm.

[0104] In some other embodiments, the step S11 includes:

[0105] S111a. Obtain material samples.

[0106] S112a. Measure the particle size of the material using a laser particle size analyzer.

[0107] S113a. According to the measurement results, a first average particle size of the material sample in the initial state and a material proportion value of the material sample in the initial state that is smaller than the first average particle size are obtained.

[0108] In some embodiments, the step S12 includes:

[0109] S121a. Grind the material sample.

[0110] S122a, sampling is performed every preset grinding time, and the particle size of the sampled material is measured using a laser particle size analyzer to obtain an 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, return the sampled material to the grinding equipment and continue grinding until the ratio meets the preset conditions, confirming that the material sample is ground to a balanced state.

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

[0113] S125a. Obtain an average particle size corresponding to the material sample ground to an equilibrium state as a second average particle size of the material sample in an equilibrium state.

[0114] S126a. According to the measurement result of the material sample ground to the equilibrium state, the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size is obtained.

[0115] It can be understood that in the above embodiment, steps S124a, S125a, and S126a are performed in no particular order.

[0116] In some embodiments, the present application provides a method for evaluating the grindability of a material, comprising:

[0117] S111. Obtain materials.

[0118] S112, reducing the material to obtain a plurality of uniform material samples after reduction.

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

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

[0121] S121. Grind each material sample for different lengths of time.

[0122] S122. Measure each of the ground material samples using a laser particle size analyzer to obtain an average particle size of each of the ground material samples.

[0123] S123, comparing 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, confirming that the corresponding material sample after grinding is a material sample ground to a balanced state.

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

[0125] S125. Obtain an average particle size corresponding to the material sample ground to an equilibrium state as a second average particle size of the material sample in an equilibrium state.

[0126] S126. According to the measurement result of the laser particle size analyzer of the material sample ground to the equilibrium state, the proportion value of the material sample in the equilibrium state that is smaller than the second average particle size is obtained.

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

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

[0129] S30. Compare the grindability value of the material and the grindability value of the comparison material to determine the relative grindability of the material. The calculation method of the relative grindability M of the material is: M = V L1 / V L0 , where V L1 Indicates the grindability value of the material, V L0 Indicates the grindability value of the comparison material.

[0130] The present application provides a standard sample quartz ore sample 1-batch 1 and a standard sample quartz ore sample 1-batch 2. The two batches of ore samples are obtained by different crushing methods. The average particle sizes of the two batches of ore samples are roughly the same, while the proportions of particles smaller than the average particle size are different, and the proportion of particles smaller than the average particle size in the batch 2 ore sample is greater than the proportion of particles smaller than the average particle size in the batch 1 ore sample.

[0131] The powder was ground in a planetary ball mill at a high speed (500 r / min).

[0132]

[0133] From the above data, we can see that the average particle size change per unit time for batch 1 ore samples to reach grinding equilibrium is 2.45μm / min, while the average particle size change per unit time for batch 2 ore samples to reach grinding equilibrium is 4.47μm / min. The relative grindability of batch 2 is 1.82 times that of batch 1. This verifies that even for the same ore samples with basically the same average particle size, the difference in grindability is very significant. Therefore, judging the grindability based only on the change in average particle size per unit time is less accurate.

[0134] Furthermore, since the average particle size change per unit time of the batch 2 ore sample to achieve grinding equilibrium is 4.47μm / min, which is greater than the average particle size change per unit time of the batch 1 ore sample to achieve grinding equilibrium of 2.45μm / min, and the proportion of particles smaller than the average particle size in the batch 2 ore sample is greater than the proportion of particles smaller than the average particle size in the batch 1 ore sample. It can be seen that the higher the proportion of particles smaller than the average particle size, the more obvious the change will be in the evaluation process of grindability. On this basis, introducing the change in the proportion of particles smaller than the average particle size per unit time to evaluate grindability is more accurate and can also provide a more accurate guidance plan for the evaluation of material grindability.

[0135] Furthermore, the present application also provides Example 1-A, Example 1-B, Example 2-A, and Example 2-B.

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

[0137] Example 1-A Particle size change of quartz ore sample 1 (standard sample) at high speed (500 r / min) of planetary ball mill

[0138]

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

[0140]

[0141]

[0142] Example 2-A, Example 2-B: Quartz ore samples No. 1 and No. 2 from Hezhou, Guangxi Zhuang Autonomous Region were taken to complete ore crushing and reduction, 100 grams each, and a group was randomly selected from the reduced materials and placed in a Bond ball mill, and ball milled for 10, 20, and 30 minutes respectively. After each ball milling time, the material samples were vibrated and sieved, and the same mass of reduced material samples were supplemented, and then the powder below the 200 mesh sieve was taken for particle size measurement, quartz ore sample 1 was used as the standard sample, and the average particle size change per unit time of different ore samples was statistically analyzed to obtain the relative grindability of different material samples.

[0143] Example 2-A Particle size change of quartz ore sample 1 (standard sample) at a speed of 70 r / min in a Bond mill

[0144]

[0145] Example 2-B Particle size change of quartz ore sample 2 at low speed (70r / min) of Bonder ball mill

[0146]

[0147]

[0148] In the above embodiments, in the first group of embodiments, Embodiment 1-A and Embodiment 1-B respectively use quartz ore samples No. 1 and No. 2, and adopt planetary ball mill for grinding, and the grinding speed is high speed (500r / min), and in the second group of embodiments, Embodiment 2-A and Embodiment 2-B respectively use quartz ore samples No. 1 and No. 2, and adopt Bond ball mill for grinding, and the grinding speed is low speed (70r / min).

[0149] From the comparison of the two groups of examples, it can be seen that when the material samples are the same but the grinding equipment and rotation speed are different, the relative grindability evaluation method of the present application can still provide an accurate relative grindability evaluation. Therefore, the applicable scenarios of this evaluation method are not limited by the grinding equipment or the rotation speed.

[0150] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for evaluating the grindability of a material, characterized in that: The evaluation method of the material grindability includes: Get the grindability value of the material; Under the same test conditions, obtain the grindability value of the comparison material; Compare the grindability values ​​of the materials and the grindability values ​​of the comparison materials to determine the relative grindability of the materials; Among them, the method for obtaining the grindability value of the material includes: Obtaining a first average particle size of the material sample in an initial state, and a material proportion value of the material sample in the initial state that is smaller than the first average particle size; Grind the material sample to an equilibrium state, obtain 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 the material sample in the equilibrium state that is smaller than the second average particle size; 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 the material sample in the initial state that is smaller than the first average particle size, the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size.

2. The method for evaluating the grindability of a material according to claim 1, characterized in that: The method of 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 sample in the initial state that is smaller than the first average particle size, the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size comprises: According to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state, a third average particle size of the material sample in the initial state is obtained; According to the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state, a fourth average particle size of the material sample in the equilibrium state is obtained; The grindability value of the material is obtained 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 for grinding to the equilibrium state.

3. The method for evaluating the grindability of a material according to claim 2, characterized in that: The method of obtaining the third average particle size of the material sample in the initial state according to the material proportion value of the material sample in the initial state that is smaller than the first average particle size and the first average particle size of the material sample in the initial state comprises: the third average particle size of the material sample in the initial state = R s L s , where L s is the first average particle size of the material sample in the initial state, R s is the proportion of the material sample in the initial state that is smaller than the first average particle size; and / or, The method of obtaining the fourth average particle size of the material sample in the equilibrium state according to the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size and the second average particle size of the material sample in the equilibrium state comprises: the fourth average particle size of the material sample in the equilibrium state = R t L t , where L t is the second average particle size of the material sample in equilibrium, R t It is the proportion of the material sample in equilibrium that is smaller than the second average particle size.

4. The method for evaluating the grindability of a material according to claim 3, characterized in that: The method of 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 of grinding to the equilibrium state includes: Grindability value V of the material L How to obtain: V L =(R s L s -R t L t ) / t, where L s is the first average particle size of the material sample in the initial state, R s is the proportion of the material sample in the initial state that is smaller than the first average particle size, L t is the second average particle size of the material sample in equilibrium, R t is the proportion of the material sample in the equilibrium state that is smaller than the second average particle size, and t represents the time taken to grind to the equilibrium state.

5. The method for evaluating the grindability of a material according to claim 4, characterized in that: In the step of comparing the grindability values ​​of the materials and the grindability values ​​of the contrast materials to determine the relative grindability of the materials: Calculation method of relative abrasiveness M of materials: M = V L1 / V L0 , where V L1 Indicates the grindability value of the material, V L0 Indicates the grindability value of the comparison material.

6. The method for evaluating the grindability of a material according to claim 1, characterized in that: The obtaining of a first average particle size of the material sample in an initial state, and a material proportion value of the material sample in an initial state that is smaller than the first average particle size, comprises: Get materials; The material is reduced to obtain a plurality of uniform material samples after reduction; The particle size of the material sample is measured using a laser particle size analyzer; According to the measurement results, a first average particle size of the material sample in the initial state and a material proportion value of the material sample in the initial state that is smaller than the first average particle size are obtained.

7. The method for evaluating the grindability of a material according to claim 6, characterized in that: The method of grinding the material sample to an equilibrium state, obtaining the time for grinding the material sample to an equilibrium state, the second average particle size of the material sample in the equilibrium state, and the proportion of the material sample in the equilibrium state that is smaller than the second average particle size includes: Grind each material sample for different lengths of time; The laser particle size analyzer is used to measure each of the ground material samples to obtain the average particle size of each of the ground material samples; Compare the average particle size of each material sample after grinding with the target particle size. If the ratio meets the preset conditions, it is confirmed that the corresponding material sample after grinding is a material sample ground to a balanced state. Obtaining the time corresponding to the material sample being ground to a balanced state as the time for the material sample to be ground to a balanced state; Obtaining an average particle size corresponding to the material sample ground to an equilibrium state as a second average particle size of the material sample in an equilibrium state; According to the measurement result of the laser particle size analyzer of the material sample ground to the equilibrium state, the material proportion value of the material sample in the equilibrium state that is smaller than the second average particle size is obtained.

8. The method for evaluating the grindability of a material according to claim 6, characterized in that: 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 conditions, confirming that the corresponding material sample after grinding is a material sample ground to an equilibrium state, if the deviation value 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 conditions.

9. The method for evaluating the grindability of a material according to claim 6, characterized in that: The target particle size ranges from 2 μm to 200 μm.

10. The method for evaluating the grindability of a material according to claim 6, characterized in that: 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.

Images