Multi-element mixed continuous basalt fiber raw material and preparation method thereof

Abstract

The invention relates to the technical field of preparation of basalt fiber raw materials, in particular to a multi-element mixed continuous basalt fiber raw material and a preparation method thereof, the continuous basalt fiber raw material comprises basalt, Inan rock and hydrothermal altered rock in a ratio of 76: 20: 4; the method comprises the steps that the attenuation rate of airflow pressure difference is obtained to determine whether airflow velocity is qualified or not, and the airflow velocity is adjusted through a velocity adjusting coefficient based on the particle size distribution change rate of mineral powder mixed raw materials; obtaining a primary density distribution deviation to determine whether the uniformity of the mixed mineral powder raw material is qualified or not, and adjusting the stirring duration based on a judgment result that the uniformity of the mixed mineral powder raw material is unqualified; adjusting the stop duration according to a comparison result of the primary density distribution deviation and the secondary density distribution deviation to obtain a primary homogenized mineral powder raw material; and acquiring diffusion characterization parameters of the vulcanizing agent in the secondary pneumatic homogenization process so as to optimize the flow velocity adjustment coefficient. The mixing uniformity of mineral powder mixed raw materials is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of basalt fiber raw material preparation, and particularly relates to a multi-element mixed continuous basalt fiber raw material and a preparation method thereof. BACKGROUND

[0002] As a kind of high-performance inorganic non-metallic material, basalt fiber has a broad application prospect in the fields of aerospace, rail transportation, building materials, etc. due to its excellent properties such as high strength, high temperature resistance and corrosion resistance. Its production takes natural basalt and related silicate rocks (such as dacite, hydrothermal altered rock, etc.) as the main raw material, and is made through high-temperature melting, wire drawing and other processes. However, the mixing uniformity of the raw material is one of the key factors that determine the performance of basalt fiber. If there is local component segregation in the mixing process of multi-element mineral powder raw material, it will cause large fluctuations in the viscosity of the melt during the melting stage, and local over-melted or unmelted particles will be left, which will further cause large fiber diameter deviation and high breakage rate during the drawing process. At the same time, uneven mixing will form composition differences and stress concentration points in the fiber, significantly reducing its tensile strength, aging resistance and other core indicators. At present, the traditional mixing process (such as mechanical stirring, intermittent pneumatic stirring) often has problems such as density difference of mineral powder and particle agglomeration, which makes it difficult to achieve efficient and uniform mixing of multi-element raw materials, becoming an important bottleneck restricting the improvement of the performance stability of basalt fiber

[0003] Chinese Patent Application Publication No. CN101811826A discloses a raw material for producing basalt fiber, which is composed of 30%-80% basalt and 20%-70% andesite by weight; the content of SiO2 in the raw material is 47%-55% by weight, and the content of Fe2O3 and FeO in the raw material is 5.2%-10.5% by weight; the acid coefficient K = (SiO2+Al2O3) / (CaO+MgO) is kept in the range of 3.5-4.8; and the preparation method is to crush the screened basalt and andesite into fine powder, and then mix the basalt powder and andesite powder according to the proportion. The present application has the advantages of wide raw material sources, low production cost, good basalt fiber quality and stable production.

[0004] In the prior art, there is a lack of real-time monitoring and dynamic adjustment of the stirring process during the stirring of the mixed mineral powder raw material, which makes it difficult to ensure the mixing uniformity of different batches of mixed mineral powder raw material, thereby resulting in poor quality of the prepared basalt fiber. SUMMARY

[0005] To this end, the application provides a multi-element mixed continuous basalt fiber raw material and a preparation method thereof, to overcome the problem that the mixing uniformity of different batches of mixed ore powder raw materials cannot be guaranteed due to the lack of real-time monitoring and dynamic adjustment of the stirring process in the prior art.

[0006] To achieve the above-mentioned purpose, in one aspect, the application provides a preparation method of a multi-element mixed continuous basalt fiber raw material, comprising:

[0007] After crushing a plurality of basalt fiber raw material ores and conveying them to corresponding hoppers, the ores are mixed at a preset ratio and then sequentially subjected to ball milling, screening and secondary magnetic separation to obtain mixed ore powder raw materials;

[0008] The mixed ore powder raw materials are subjected to primary pneumatic homogenization in an intermittent stirring manner, the decay rate of the pressure difference of the airflow in the primary pneumatic homogenization process is obtained to determine whether the airflow velocity is qualified, and under the condition that the airflow velocity is determined to be unqualified, the airflow velocity is adjusted based on the particle size distribution change rate of the mixed ore powder raw materials with a flow rate adjustment coefficient;

[0009] The primary density distribution deviation of the ore powder in the ore powder mixing chamber is obtained to determine whether the uniformity of the mixed ore powder raw materials is qualified, and the stirring duration is adjusted based on the determination result that the uniformity of the mixed ore powder raw materials is unqualified;

[0010] The secondary density distribution deviation of the ore powder in the ore powder mixing chamber is obtained, and the rest duration is adjusted according to the comparison result of the primary density distribution deviation and the secondary density distribution deviation to obtain primary homogenized ore powder raw materials;

[0011] The vulcanizing agent is mixed with the primary homogenized ore powder raw materials in a proportion by pneumatic conveying and subjected to secondary pneumatic homogenization, and the diffusion characterization parameter of the vulcanizing agent in the secondary pneumatic homogenization process is obtained to optimize the flow rate adjustment coefficient.

[0012] Further, the process of determining whether the airflow velocity is qualified based on the decay rate comprises:

[0013] The decay rate is compared with a preset decay rate;

[0014] The airflow velocity is determined to be unqualified based on the comparison result that the decay rate is less than the preset decay rate.

[0015] Further, under the condition that the airflow velocity is determined to be unqualified, the process of adjusting the airflow velocity based on the particle size distribution change rate of the mixed ore powder raw materials comprises:

[0016] The particle size distribution change rate is compared with a preset distribution change rate;

[0017] Set a plurality of flow rate adjustment coefficients based on the comparison result of the particle size distribution change rate and the preset distribution change rate, and increase the airflow flow rate based on the plurality of flow rate adjustment coefficients.

[0018] Further, the determination process of the primary density distribution deviation includes:

[0019] The ultrasonic tomography technology is adopted to determine the distribution density of the ore powder at any position in the ore powder mixing cavity.

[0020] The density distribution variation coefficient of the ore powder distribution density is determined as the primary density distribution deviation.

[0021] Further, the process of determining whether the uniformity of the mixed ore powder raw material is qualified based on the primary density distribution deviation includes:

[0022] Compare the primary density distribution deviation with a preset distribution deviation;

[0023] Determine that the uniformity of the mixed ore powder raw material is unqualified based on the comparison result that the primary density distribution deviation is greater than the preset distribution deviation.

[0024] Further, under the condition that the uniformity of the mixed ore powder raw material is determined to be unqualified, the process of adjusting the stirring time length includes:

[0025] Compare the first distribution difference value between the primary density distribution deviation and the preset distribution deviation with a preset difference value;

[0026] Set a plurality of time length adjustment coefficients based on the comparison result of the first distribution difference value and the preset difference value, and increase the stirring time length according to the plurality of time length adjustment coefficients.

[0027] Further, the process of adjusting the stop time length based on the comparison result of the primary density distribution deviation and the secondary density distribution deviation includes:

[0028] Compare the primary density distribution deviation and the secondary density distribution deviation;

[0029] Determine to decrease the stop time length based on the comparison result that the primary density distribution deviation is less than the secondary density distribution deviation;

[0030] Determine to increase the stop time length based on the comparison result that the primary density distribution deviation is equal to the secondary density distribution deviation.

[0031] Further, the process of determining whether the diffusion of the vulcanizing agent is uniform based on the diffusion characteristic parameter includes:

[0032] Compare the diffusion characteristic parameter with a preset diffusion characteristic parameter;

[0033] determine that the vulcanizing agent is not diffused uniformly based on a comparison result of the diffusion characteristic parameter being greater than the preset diffusion characteristic parameter.

[0034] Further, under the condition of determining that the vulcanizing agent is not diffused uniformly, the process of optimizing the flow rate adjustment coefficient comprises:

[0035] comparing the characteristic parameter difference between the diffusion characteristic parameter and the preset diffusion characteristic parameter with a preset characteristic parameter difference;

[0036] setting a plurality of flow rate optimization coefficients based on a comparison result of the characteristic parameter difference and the preset characteristic parameter difference, so as to optimize the flow rate adjustment coefficient according to the plurality of flow rate optimization coefficients.

[0037] In another aspect, the present application also provides a multi-element mixed continuous basalt fiber raw material, which is prepared by mixing raw materials in the following proportions, comprising:

[0038] Basalt: dacite: hydrothermal altered rock = 76:20:4.

[0039] Compared with the prior art, the present application has the beneficial effects that whether the flow rate of the gas flow is qualified is determined according to the attenuation rate of the gas flow pressure difference in the first pneumatic homogenization process, and the faster the attenuation rate of the gas flow pressure difference, the faster the rate of mixing different density of various ore powders in the mixed ore powder raw material. Under the same stirring time, the faster the attenuation rate, the more uniform the mixing. However, too large flow rate of the gas flow will cause the particle size of the ore powder particles to become smaller after collision, and the mixed ore powder raw material with a large proportion of small particle size will result in poor quality of the basalt fiber. Therefore, the corresponding flow rate adjustment coefficient is determined according to the particle size distribution rate to adjust the flow rate of the gas flow, so as to increase the flow rate of the gas flow while ensuring the proportion of small particle size, thereby ensuring the mixing uniformity of the mixed ore powder raw material while improving the quality of the mixed ore powder raw material. After adjusting the flow rate of the gas flow, the secondary density distribution deviation is obtained, the stirring time and the standby time are adjusted according to the comparison result of the first density distribution deviation and the secondary density distribution deviation, so as to maximize the utilization rate of the stirring time and the standby time. The diffusion characteristic parameter of the vulcanizing agent in the secondary pneumatic homogenization process is obtained to optimize the flow rate of the gas flow in the first pneumatic homogenization process, thereby improving the mixing uniformity of different batches of mixed ore powder raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Flow chart of the preparation method of the multi-element mixed continuous basalt fiber raw material of the embodiment of the present application;

[0041] Figure 2 Flow chart of determining whether the flow rate of the gas flow is qualified;

[0042] Figure 3 Flow chart for determining whether the uniformity of the mixed ore powder raw material is qualified for the embodiment of the present application;

[0043] Figure 4 Flow chart for determining whether the diffusion of the vulcanizing agent is uniform for the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the objects and advantages of the present application clearer, the present application will be further described in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0045] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and not to limit the protection scope of the present application.

[0046] Please refer to Figure 1 - Figure 4 as shown, Figure 1 Flow chart for the preparation method of the multi-element mixed continuous basalt fiber raw material for the embodiment of the present application; Figure 2 Flow chart for determining whether the gas flow rate is qualified for the embodiment of the present application;

[0047] Figure 3 Flow chart for determining whether the uniformity of the mixed ore powder raw material is qualified for the embodiment of the present application; Figure 4 Flow chart for determining whether the diffusion of the vulcanizing agent is uniform for the embodiment of the present application.

[0048] The preparation method of the multi-element mixed continuous basalt fiber raw material for the embodiment of the present application comprises:

[0049] Step S1, crushing a plurality of basalt fiber raw material ores and conveying them to corresponding hoppers, mixing them at a preset ratio, and then sequentially performing ball milling, screening and secondary magnetic separation to obtain a mixed ore powder raw material;

[0050] Step S2, performing one-time pneumatic homogenization on the mixed ore powder raw material in an intermittent stirring manner, obtaining the decay rate of the gas flow pressure difference of the one-time pneumatic homogenization process to determine whether the gas flow rate is qualified, and based on the particle size distribution change rate of the mixed ore powder raw material, adjusting the gas flow rate by a flow rate adjustment coefficient under the condition that the gas flow rate is determined to be unqualified;

[0051] Step S3, obtaining the one-time density distribution deviation of the ore powder in the ore powder mixing cavity to determine whether the uniformity of the mixed ore powder raw material is qualified, and adjusting the stirring time based on the determination result that the uniformity of the mixed ore powder raw material is unqualified;

[0052] Step S4, obtaining the secondary density distribution deviation of the ore powder in the ore powder mixing cavity, and adjusting the length of the stop time according to the comparison result of the primary density distribution deviation and the secondary density distribution deviation to obtain the primary homogenized ore powder raw material;

[0053] Step S5, mixing the vulcanizing agent and the primary homogenized ore powder raw material in proportion in a pneumatic conveying manner and performing secondary pneumatic homogenization, and obtaining the diffusion characteristic parameter of the vulcanizing agent in the secondary pneumatic homogenization process to optimize the flow rate adjustment coefficient.

[0054] Specifically, in the embodiment of the present application, the basalt fiber raw material includes basalt, dacite, hydrothermal altered rock and vulcanizing agent, the basalt, dacite and hydrothermal altered rock are respectively crushed to 10mm-15mm and then sent to the corresponding silo for storage, during batching, the belt metering device (the accuracy requirement error is ≥0.3%) under the silo is used to measure and mix the raw materials in the formula proportion to the conveyor belt, and then the ball mill is used for ball milling, the ore powder after ball milling is screened by a swing vibrating screen to make the particle size range of the ore powder be 60-100 mesh, the screened ore powder is removed by one-rough-one-precision two-stage magnetic separation to remove the magnetic iron in the ore powder and the mechanical iron generated in the ball milling process to ensure that the ferric oxide in the ore powder is not changed due to the previous production process, the ore powder after magnetic separation is sent to the homogenizing tank by a negative pressure fan for primary pneumatic homogenization, and the ore powder after primary pneumatic homogenization and the vulcanizing agent are transported to the homogenizing tower by compressed air for secondary pneumatic homogenization, and the basalt fiber raw material is obtained after the secondary pneumatic homogenization is completed.

[0055] Specifically, the vulcanizing agent is, for example, industrial sulfur, and the addition proportion is 2% of the mass of the primary homogenized ore powder raw material.

[0056] Specifically, the ball mill is, for example, MQYg3660 type, and the swing vibrating screen is, for example, FASTY-600 type.

[0057] Specifically, the one-rough-one-precision two-stage magnetic separation refers to different magnetic field strengths, the magnetic field strength range of rough magnetic separation is 500-1500 gauss, and the magnetic field strength range of fine magnetic separation is 1500-3000 gauss.

[0058] Specifically, the determination process of the attenuation rate of the airflow pressure difference includes:

[0059] Two pressure sensors are arranged at the bottom and the top of the ore powder mixing cavity of the homogenizing tank to obtain the gas static pressure at the corresponding height;

[0060] The difference between the gas static pressures of the two pressure sensors is determined as the airflow pressure difference;

[0061] The reduction value of the airflow pressure difference in unit time is determined as the attenuation rate of the airflow pressure difference.

[0062] Specifically, the process of determining whether the airflow flow rate is qualified based on the decay rate comprises:

[0063] comparing the decay rate with a preset decay rate;

[0064] determining that the airflow flow rate is unqualified based on a comparison result that the decay rate is less than the preset decay rate;

[0065] determining that the airflow flow rate is qualified based on a comparison result that the decay rate is greater than or equal to the preset decay rate.

[0066] Specifically, the preset decay rate is set to a range of [0.3 kPa / min, 2 kPa / min], and the embodiment of the present application preferably 0.8 kPa / min.

[0067] It can be understood that in the pneumatic mixing process, the change of the airflow pressure difference is essentially caused by the difference in the concentration of the mineral powder particles at different heights. The higher the concentration of the mineral powder particles, the greater the pressure loss when the airflow passes through, and the more significant the airflow pressure difference. In the initial mixing stage, the mineral powder particles remain significantly layered due to the density difference. The density of the lower basalt layer is the largest, the mineral powder particles are settled and gathered, the particle concentration in the unit volume is the largest, the resistance when the airflow passes through is the strongest, the pressure loss is the largest, and the gas static pressure in this area is the lowest. The density of the upper altered rock layer is the smallest, the mineral powder particles are loosely distributed, and even part of them are suspended, the particle concentration in the unit volume is the smallest, the resistance when the airflow passes through is the weakest, the pressure loss is the smallest, and the gas static pressure in this area is higher. The concentration of the andesite in the middle layer is between the two, the pressure loss is in the middle. With the continuous progress of the mixing process, the airflow will disturb the three kinds of mineral powder particles, and finally realize the uniform distribution in the whole space. The proportion of the three kinds of mineral powder particles at any height is close to the initial proportion, and the total particle concentration in the unit volume is basically the same. Since the concentrations of the mineral powder particles at different heights are similar, the friction, collision and throttling effects when the airflow passes through are consistent, and the pressure loss is basically the same. At this time, the difference in the gas static pressure detected by the pressure sensors at different heights is extremely small, and the airflow pressure difference tends to be stable. The decay rate of the airflow pressure difference represents the ability of the airflow to disturb the mineral powder particles. The larger the decay rate, the stronger the ability of the airflow to disturb the mineral powder particles, and the more uniform the mineral powder raw materials are stirred in the same pneumatic stirring time.

[0068] It can be understood that the gas static pressure refers to the pressure per unit area vertically acting on the gas when it is at rest or flows at a uniform speed. When the airflow passes through the particle group, friction and collision will occur between the gas and the particles, and the gap between the particles will hinder the flow of the airflow, forming local vortex, resulting in part of the energy of the airflow being consumed. The energy loss is in the form of "reduction of static pressure", that is, the static pressure after the airflow passes through the particle group will be smaller than the initial static pressure.

[0069] Specifically, the particle size distribution change rate of the mixed ore powder raw material refers to the increase of the proportion of the ore powder particles with a particle size less than 250 microns in the mixed ore powder raw material, and the proportion of the ore powder particles with different particle sizes in the ore powder raw material is determined by using a laser diffraction online particle size analyzer, which is a prior art and will not be described here.

[0070] It can be understood that, in the pneumatic stirring process, the particle size of part of the ore powder particles becomes smaller due to the collision between the ore powder particles, and the greater the airflow velocity, the more violent the collision, and the more the proportion of the ore powder particles with a smaller particle size. However, a large proportion of ore powder particles with a too small particle size will affect the imbalance of the melting rate of the basalt fiber raw material in the process of preparing the fiber, easily leading to local overheating, thereby causing uneven melt composition and reducing the quality of the prepared basalt fiber, and affecting the continuity of fiber forming. Therefore, the adjustment coefficient of the airflow velocity is determined according to the change rate of the proportion of the ore powder particles with a smaller particle size, so as to avoid too large airflow velocity leading to too large proportion of the ore powder particles with a smaller particle size.

[0071] Specifically, under the condition that the airflow velocity is unqualified, the process of adjusting the airflow velocity based on the particle size distribution change rate of the mixed ore powder raw material includes:

[0072] comparing the particle size distribution change rate with a preset distribution change rate;

[0073] setting a plurality of flow rate adjustment coefficients based on the comparison result of the particle size distribution change rate and the preset distribution change rate, and increasing the airflow velocity based on the plurality of flow rate adjustment coefficients.

[0074] Specifically, the first flow rate adjustment coefficient is determined based on the comparison result that the particle size distribution change rate is greater than the preset distribution change rate;

[0075] The second flow rate adjustment coefficient is determined based on the comparison result that the particle size distribution change rate is less than or equal to the preset distribution change rate.

[0076] Specifically, the preset distribution change rate is set to [8%, 16%], and the embodiment of the present application is preferably 10%; the first flow rate adjustment coefficient is set to [1.05, 1.12], and the embodiment of the present application is preferably 1.08; and the second flow rate adjustment coefficient is set to [1.13, 1.2], and the embodiment of the present application is preferably 1.15.

[0077] Specifically, the process of determining the primary density distribution deviation includes:

[0078] The distribution density of the ore powder at any position in the ore powder mixing cavity is determined by using an ultrasonic tomography technology.

[0079] The coefficient of variation of the density distribution of the ore powder distribution density is determined as a primary density distribution deviation.

[0080] Specifically, the coefficient of variation of the density distribution is equal to the standard deviation of the ore powder distribution density / the average value of the ore powder distribution density*100%.

[0081] Specifically, the ultrasonic tomography technology needs to arrange an annular ultrasonic sensor array on the outer wall of the ore powder mixing cavity, and the ore powder distribution density at any position in the ore powder mixing cavity is determined by the time difference and amplitude change of the transmitted / received signals, which is prior art and will not be described in detail.

[0082] Specifically, the process of determining whether the uniformity of the mixed ore powder raw material is qualified based on the primary density distribution deviation includes:

[0083] Comparing the primary density distribution deviation with a preset distribution deviation;

[0084] Based on the comparison result that the primary density distribution deviation is greater than the preset distribution deviation, it is determined that the uniformity of the mixed ore powder raw material is unqualified;

[0085] Based on the comparison result that the primary density distribution deviation is less than or equal to the preset distribution deviation, it is determined that the uniformity of the mixed ore powder raw material is qualified.

[0086] It can be understood that the more uniform the mixed ore powder raw material is mixed, the smaller the density distribution deviation is.

[0087] Specifically, the preset distribution deviation is set to [1%, 3%], and the embodiment of the present application preferably 2%.

[0088] Specifically, under the condition that the uniformity of the mixed ore powder raw material is determined to be unqualified, the process of adjusting the stirring time length includes:

[0089] Comparing the first distribution difference value between the primary density distribution deviation and the preset distribution deviation with a preset difference value;

[0090] Based on the comparison result of the first distribution difference value and the preset difference value, a plurality of time length adjustment coefficients are set to increase the stirring time length according to the plurality of time length adjustment coefficients.

[0091] Specifically, based on the comparison result that the first distribution difference value is greater than the preset difference value, it is determined to increase the stirring time length by a first time length adjustment coefficient;

[0092] Based on the comparison result that the first distribution difference value is less than or equal to the preset difference value, it is determined to increase the stirring time length by a second time length adjustment coefficient.

[0093] Specifically, the preset distribution deviation is set to [0.5%, 1.5%], and the embodiment of the application preferably 1%; the first time length adjustment coefficient is set to [1.4, 1.8], and the embodiment of the application preferably 1.6; the second time length adjustment coefficient is set to [1.1, 1.3], and the embodiment of the application preferably 1.25.

[0094] Specifically, the secondary density distribution deviation is the density distribution deviation collected after the initial stirring time length is completed after the stirring time length is adjusted.

[0095] Specifically, the process of determining the adjustment of the stop time length based on the comparison result of the primary density distribution deviation and the secondary density distribution deviation comprises:

[0096] comparing the primary density distribution deviation and the secondary density distribution deviation;

[0097] determining that the stop time length is reduced based on the comparison result that the primary density distribution deviation is less than the secondary density distribution deviation;

[0098] determining that the stop time length is increased based on the comparison result that the primary density distribution deviation is equal to the secondary density distribution deviation;

[0099] determining that the stop time length is unchanged based on the comparison result that the primary density distribution deviation is greater than the secondary density distribution deviation.

[0100] It can be understood that the pause time is the "stationary period" of the mineral powder particles after the stirring is interrupted. If the pause time is extremely short, the mineral powder particles have not yet undergone obvious sedimentation or stratification, and the next stirring can continue directly in a semi-mixed state, which is equivalent to nearly continuous stirring. In this case, the uniformity of the mineral powder mixing mainly depends on the stirring time, and the effect of the pause is weakened. However, because the particles have not undergone a short state adjustment, some tiny dead corners are difficult to be eliminated by the secondary impact of the airflow, and the uniformity improvement rate is slow; if the pause time is too long, the mineral powder particles may be significantly stratified due to differences in density and particle size. Particles with high density or coarse particle size may settle to the bottom of the stirring chamber, and particles with low density or fine particle size may float on the upper part or adhere to the cavity wall. This stratification will significantly offset the uniformity results of the previous stirring. The next stirring must overcome the stratification before continuing to mix. If stratification is severe, even if the subsequent stirring time is extended, it is difficult to completely eliminate the local concentration differences, which will eventually lead to a further decline in overall uniformity; a reasonable pause time can allow the particles to avoid the directional movement inertia formed by continuous stirring after a short period of rest, so that the particle group is in a relatively relaxed state. During the next stirring, the airflow can impact the particles from a new angle, breaking the original circulation dead corner and promoting more comprehensive mixing. At the same time, due to the short pause time, the particles do not undergo significant stratification, which will not offset the effect of the previous stirring. On the contrary, the alternation of "stirring-pause-re-stirring" can significantly improve the uniformity.

[0101] Specifically, the process of increasing the pause time includes:

[0102] comparing a second distribution difference between the secondary density distribution deviation and the preset distribution deviation with the preset distribution difference;

[0103] Determining, based on a comparison result that the second distribution difference is less than the preset distribution difference, to increase the pause duration by a first duration correction coefficient;

[0104] Based on the comparison result that the second distribution difference is greater than or equal to the preset distribution difference, it is determined to increase the pause duration by a second duration correction coefficient.

[0105] Specifically, the value range of the first duration correction coefficient is set to [1.15, 1.29], and the preferred value in the embodiment of the present invention is 1.22; the value range of the second duration correction coefficient is set to [1.06, 1.14], and the preferred value in the embodiment of the present invention is 1.11.

[0106] Specifically, the process of reducing the pause time includes:

[0107] comparing a third distribution difference between the secondary density distribution deviation and the primary density distribution deviation with the preset distribution difference;

[0108] determining to decrease the shutdown duration by a third duration correction coefficient based on a comparison result that the third distribution difference is less than the preset distribution difference;

[0109] determining to decrease the shutdown duration by a fourth duration correction coefficient based on a comparison result that the third distribution difference is greater than or equal to the preset distribution difference.

[0110] Specifically, the third duration correction coefficient is set in a range of [0.85, 0.9], and the embodiment of the present application preferably is 0.88; the second duration correction coefficient is set in a range of [0.91, 0.96], and the embodiment of the present application preferably is 0.94.

[0111] Specifically, the determination process of the diffusion characterization parameter of the vulcanizing agent includes:

[0112] obtaining a diffusion image after the vulcanizing agent is delivered in the secondary pneumatic homogenization process;

[0113] dividing the diffusion image into several regions after pre-processing;

[0114] determining a sub-region in any of the regions, in which the gray value is greater than or equal to a preset gray value;

[0115] determining the percentage of the area of the sub-region to the area of the corresponding region as the diffusion value;

[0116] determining the standard deviation of the diffusion values of the several regions as the diffusion characterization parameter of the vulcanizing agent.

[0117] Specifically, the diffusion image can be obtained at an observation window of the homogenization tower by an industrial camera, and the model of the industrial camera is not specifically limited.

[0118] Specifically, the pre-processing process of the diffusion image includes but is not limited to the processes of graying, denoising and filtering, and the specific process is not limited.

[0119] Specifically, the preset gray value is set in a range of [100, 120], and the embodiment of the present application preferably is 110.

[0120] It can be understood that the color of the basalt-dominant mixed ore powder raw material presents a dark gray to gray-black tone, and the vulcanizing agent is light-colored. During the mixing process, if the vulcanizing agent is evenly distributed in the primary homogenized ore powder raw material, the gray value of the overall color tends to be uniform, and the diffusion characteristic parameter is small. If the uniformity of the distribution of the vulcanizing agent in the primary homogenized ore powder raw material is poor, there may be a phenomenon of aggregation of the vulcanizing agent in local areas, which is manifested as a larger gray value. The mixing uniformity of the vulcanizing agent in the primary homogenized ore powder raw material is limited by the uniformity of the primary homogenized ore powder raw material itself. If the mixing uniformity of the primary homogenized ore powder raw material itself is poor, there may be high-density areas with coarse particles and tight accumulation, and low-density areas with fine particles and loose accumulation. When the vulcanizing agent is added by pneumatic conveying, the low-density areas have good air permeability, and the airflow can easily carry the vulcanizing agent deep into the low-density areas. As a result, there may be a local concentration of the vulcanizing agent, which is manifested as a color that is too light and an excessive dispersion of the vulcanizing agent. In the high-density areas, the airflow is difficult to penetrate, and the vulcanizing agent tends to accumulate on the surface of the high-density areas, forming a local high-concentration area, which leads to uneven distribution of the gray value in the diffusion image.

[0121] Specifically, the process of determining whether the diffusion of the vulcanizing agent is uniform based on the diffusion characteristic parameter includes:

[0122] comparing the diffusion characteristic parameter with a preset diffusion characteristic parameter;

[0123] determining that the diffusion of the vulcanizing agent is not uniform based on a comparison result that the diffusion characteristic parameter is greater than the preset diffusion characteristic parameter;

[0124] determining that the diffusion of the vulcanizing agent is uniform based on a comparison result that the diffusion characteristic parameter is less than or equal to the preset diffusion characteristic parameter.

[0125] Specifically, the preset diffusion characteristic parameter is set to have a value range of [5%, 10%], and the embodiment of the present application preferably has a value of 8%.

[0126] Specifically, under the condition of determining that the diffusion of the vulcanizing agent is not uniform, the process of optimizing the flow rate adjustment coefficient includes:

[0127] comparing a characteristic parameter difference between the diffusion characteristic parameter and the preset diffusion characteristic parameter with a preset characteristic parameter difference;

[0128] setting a plurality of flow rate optimization coefficients based on a comparison result of the characteristic parameter difference and the preset characteristic parameter difference, so as to optimize the flow rate adjustment coefficient according to the plurality of flow rate optimization coefficients.

[0129] Specifically, a first flow rate optimization coefficient is determined to optimize the flow rate adjustment coefficient based on a comparison result that the characteristic parameter difference is greater than the preset characteristic parameter difference.

[0130] determining to optimize the flow rate adjustment coefficient with a second flow rate optimization coefficient based on a comparison result of the characteristic parameter difference being less than or equal to the preset characteristic parameter difference.

[0131] Specifically, the preset characteristic parameter difference is set to [2%, 4%], and the embodiment of the present application is preferably 2.5%; the first flow rate optimization coefficient is set to [1.05, 1.08], and the embodiment of the present application is preferably 1.06; and the second flow rate optimization coefficient is set to [1.02, 1.04], and the embodiment of the present application is preferably 1.03.

[0132] The multi-element mixed continuous basalt fiber raw material is made by mixing raw materials in the following proportions:

[0133] Basalt: Dacite: Hydrothermal altered rock = 76:20:4.

[0134] Specifically, basalt, as a basic rock, is rich in CaO, MgO and other fluxing components, providing basic fluidity for the melt; the high SiO2 and Al2O3 characteristics of dacite can enhance the structural stability and strength of the fiber; and the hydrothermal alteration rock (such as chloritization and silicification products) can adjust the viscosity sensitivity of the melt through secondary minerals, and the combination of the three can precisely match the stringent requirements of basalt fiber melt drawing on composition (such as SiO245%-55%, Al2O312%-18%), making up for the defects of single rock composition fluctuation. From the perspective of resource utilization, such rocks are mostly symbiotic or secondary products of volcanic activity, widely distributed and often associated, and their joint use can broaden the source of raw materials, reduce dependence on high-purity single basalt ore, and especially efficiently convert low-grade altered rock resources, improving the comprehensive utilization rate of mineral resources. From the perspective of process economy, the mixing of multiple raw materials can balance the use of high-cost high-quality basalt and low-cost altered rock by adjusting the proportion of different rocks, reducing raw material costs while ensuring fiber performance, and reducing energy consumption and process control difficulty in the melting process by taking advantage of the complementary composition, providing support for continuous and stable production.

[0135] In implementation, the sources of basalt, dacite and hydrothermal altered rock are not limited, wherein the composition of basalt is shown in Table 1, the composition of dacite is shown in Table 2, and the composition of hydrothermal altered rock is shown in Table 3.

[0136] Table 1 Composition detection results of basalt

[0137]

[0138]

[0139] Table 2 Composition detection results of dacite

[0140] Serial number Ingredient name Content (%) 1 Loss on ignition (1025°C) 0.72 2 Aluminium trioxide 13.80 3 Silicon dioxide 67.92 4 Iron trioxide 5.46 5 Calcium oxide 1.57 6 Magnesium oxide 0.45 7 Potassium oxide 4.42 8 Sodium oxide 4.80 9 Titanium dioxide 2 0.53

[0141] Table 3 Composition detection results of hydrothermal alteration rock

[0142]

[0143]

[0144] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A method for preparing a multi-component mixed continuous basalt fiber raw material, characterized in that: include: After crushing several basalt fiber raw material ores, they are transported to the corresponding silo, mixed in a preset ratio, and then subjected to ball milling, screening, and secondary magnetic separation to obtain mixed mineral powder raw materials; performing a pneumatic homogenization on the mixed mineral powder raw material in an intermittent stirring manner, obtaining a decay rate of the airflow pressure difference during the pneumatic homogenization process to determine whether the airflow velocity is qualified, and if the airflow velocity is determined to be unqualified, adjusting the airflow velocity using a velocity adjustment coefficient based on a change rate of the particle size distribution of the mixed mineral powder raw material; Obtaining a primary density distribution deviation of the mineral powder in the mineral powder mixing chamber to determine whether the uniformity of the mixed mineral powder raw material is qualified, and adjusting the stirring time based on the determination result that the uniformity of the mixed mineral powder raw material is unqualified; Obtaining a secondary density distribution deviation of the mineral powder in the mineral powder mixing chamber, and adjusting a pause duration according to a comparison result of the primary density distribution deviation and the secondary density distribution deviation to obtain a primary homogenized mineral powder raw material; The sulfiding agent is mixed with the primary homogenized ore powder raw material in a pneumatic conveying manner in proportion and subjected to secondary pneumatic homogenization, and diffusion characterization parameters of the sulfiding agent during the secondary pneumatic homogenization process are obtained to optimize the flow rate adjustment coefficient.

2. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 1, characterized in that: The process of determining whether the air flow rate is qualified based on the attenuation rate includes: comparing the decay rate with a preset decay rate; The air flow rate is determined to be unqualified based on a comparison result that the decay rate is less than the preset decay rate.

3. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 2, characterized in that: Under the condition that the air flow velocity is determined to be unqualified, the process of adjusting the air flow velocity based on the particle size distribution change rate of the mineral powder mixed raw material includes: comparing the particle size distribution change rate with a preset distribution change rate; A plurality of flow rate adjustment coefficients are set based on a comparison result of the particle size distribution change rate and the preset distribution change rate, so as to increase the air flow rate based on the plurality of flow rate adjustment coefficients.

4. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 3, characterized in that: The process of determining the primary density distribution deviation includes: Ultrasonic tomography technology is used to determine the mineral powder distribution density at any position in the mineral powder mixing chamber; The density distribution variation coefficient of the mineral powder distribution density is determined as the primary density distribution deviation.

5. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 4, characterized in that: The process of determining whether the uniformity of the mixed mineral powder raw material is qualified based on the primary density distribution deviation includes: comparing the primary density distribution deviation with a preset distribution deviation; Based on the comparison result that the primary density distribution deviation is greater than the preset distribution deviation, it is determined that the uniformity of the mixed mineral powder raw material is unqualified.

6. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 5, characterized in that: When it is determined that the uniformity of the mixed mineral powder raw material is unqualified, the process of adjusting the stirring time includes: comparing a first distribution difference between the primary density distribution deviation and the preset distribution deviation with a preset difference; A plurality of time adjustment coefficients are set based on a comparison result between the first distribution difference and the preset difference, so as to increase the stirring time according to the plurality of time adjustment coefficients.

7. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 6, characterized in that: The process of determining and adjusting the pause duration based on the comparison result of the primary density distribution deviation and the secondary density distribution deviation includes: comparing the primary density distribution deviation and the secondary density distribution deviation; Determining to reduce the pause duration based on a comparison result that the primary density distribution deviation is less than the secondary density distribution deviation; The pause duration is increased based on a comparison result that the primary density distribution deviation is equal to the secondary density distribution deviation.

8. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 7, characterized in that: The process of determining whether the diffusion of the vulcanizing agent is uniform based on the diffusion characterization parameter includes: comparing the diffusion characterization parameter with a preset diffusion characterization parameter; The diffusion of the vulcanizing agent is determined to be non-uniform based on a comparison result that the diffusion characterization parameter is greater than the preset diffusion characterization parameter.

9. The method for preparing a multi-component mixed continuous basalt fiber raw material according to claim 8, characterized in that: Under the condition that the diffusion of the sulfiding agent is determined to be non-uniform, the process of optimizing the flow rate adjustment coefficient includes: comparing a characterization parameter difference between the diffusion characterization parameter and the preset diffusion characterization parameter with a preset characterization parameter difference; A plurality of flow rate optimization coefficients are set based on a comparison result of the characterization parameter difference and the preset characterization parameter difference, so as to optimize the flow rate adjustment coefficient according to the plurality of flow rate optimization coefficients.

10. A continuous basalt fiber raw material prepared by the method for preparing a multi-component mixed continuous basalt fiber raw material according to any one of claims 1 to 9, characterized in that: The basalt fiber raw material is made by mixing raw materials in the following proportions, including: Basalt: dacite: hydrothermal altered rock = 76:20:4.

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