Production and preparation process of artificially synthesized mica

Abstract

The invention relates to the technical field of artificially synthesized mica, in particular to a production and preparation process of artificially synthesized mica, which comprises the following steps: proportioning materials for preparing the artificially synthesized mica in percentage by weight, and stirring and mixing; wherein the materials comprise fused magnesite, potassium fluosilicate, potassium feldspar and calcined kaolin; a temperature measuring device is arranged in the high-temperature kiln, and material temperature data at a temperature measuring point in the melting process are collected; filling the mixed material into a high-temperature kiln; melting the mixed material in the furnace body; in the melting process, the height of the graphite electrode is adjusted according to the material temperature change condition; stopping power supply after melting is completed, so that materials in the furnace body are naturally cooled and crystallized; and opening the furnace and discharging to obtain the artificially synthesized mica. According to the invention, temperature measurement at different heights is carried out on the melting process in the process of artificially synthesizing mica, and the characteristics of temperature change are analyzed to adjust the up-down movement of the graphite electrode, so that uniform heating of materials is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of artificial synthetic mica, and in particular to a production and preparation process of artificial synthetic mica. Background Art

[0002] Mica is a general term for layered silicate minerals containing a variety of metal elements. From the perspective of structure and composition, it is mainly aluminosilicates of alkaline earth metals and alkali metals with a monoclinic complex network layered structure. Mica is widely used in aerospace, electrical appliances, machinery, pearlescent effect materials and other fields due to its good elasticity, transparency, high-frequency insulation and chemical stability. However, the demand for high-quality natural mica in my country has been rising year by year, and imported natural mica is far from meeting the domestic market demand. Compared with natural mica, synthetic mica is less restricted by natural conditions, and its structure is similar to that of natural mica. Its purity, transparency, insulation and high temperature resistance are better than natural mica. Therefore, it can completely replace or even surpass natural mica in some industrial applications.

[0003] The synthesis process of mica can be mainly divided into the crucible descending seed method and the internal heat method. Among them, although the crucible descending seed method can prepare large book-shaped crystals, it has high production costs due to its high energy consumption, long cycle and the need for expensive platinum crucibles, so it is less used in large-scale industrial production. The internal heat method has the advantages of low energy consumption, high yield, low fluoride volatilization, and does not require a crucible. Therefore, this method has been widely studied as the main method for large-scale synthesis and production of mica. The Chinese patent "CN102951654B Production process of artificial synthetic mica" mentioned that the existing internal heat method can basically meet the product requirements, but the heat conduction method used in the process of synthesizing mica is tip discharge, using the method of pre-buried graphite electrodes. After power is turned on, the uppermost position of the material first melts, and then the heat is conducted from the furnace through the material to the radial and vertical directions of the plane. Therefore, the overall thermal balance of the furnace temperature is very slow, and the material at the bottom of the furnace melts slowly because it is heated slowly, and the overall material is heated unevenly, which leads to a decrease in the production quality of the product.

[0004] To address the above problems, traditional methods usually use a liftable graphite electrode to make the concentrated heat-generating part of the graphite electrode closer to the unmelted material and improve the heat utilization rate. However, this method still cannot better guarantee the uniform heating of the material at different heights and the heating and insulation time, which in turn affects the production quality of artificial synthetic mica. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a production and preparation process of artificial synthetic mica to solve the existing problems.

[0006] The production and preparation process of an artificial synthetic mica of the present application adopts the following technical scheme: An embodiment of the present application provides a production process for artificial synthetic mica, which process includes the following steps: S1: mixing materials for preparing synthetic mica according to weight percentage, and stirring and mixing; wherein the materials include: fused magnesia, potassium fluorosilicate, potassium feldspar and calcined kaolin; S2: A temperature measuring device is installed in the high-temperature kiln to collect material temperature data at the temperature measuring points during the melting process; S3: Filling the mixed material into a high temperature kiln; S4: Melting the mixed material in the furnace body; S5: During the melting process, adjust the height of the graphite electrode according to the temperature change of the material according to the following steps: (1) The temperature data collected at each temperature measurement point is used to predict the temperature at N future moments. The edit distance between the predicted temperatures of any two temperature measurement points at the same height is used as the difference measure. The mean of all difference measure results at the same height is used as the temperature trend anomaly. (2) Analyze the temperature rise trend of the temperature data collected at each temperature measurement point, calculate the average temperature rise trend of all temperature measurement points at the same height; sum the differences between the average temperature rise trends at different heights as the temperature rise anomaly; (3) The reciprocal of the sum of the above-mentioned temperature trend abnormal value and the temperature rise abnormal value is taken as the uniform value of the material temperature at the corresponding height; (4) Determine the heat average value at the corresponding height by combining the mean difference of the temperature change rate between all temperature measurement points at the same height and the mean difference of the first temperature rise time; (5) Use the temperature uniformity value and heat uniformity value to adjust the position height of the graphite electrode; S6: After melting is completed, the power supply is stopped to allow the material inside the furnace to cool and crystallize naturally; S7: Open the furnace and discharge the material to obtain artificial synthetic mica.

[0007] Preferably, in step S1, the weight percentages of the materials are: 30% to 32% fused magnesia, 20% to 21% potassium fluorosilicate, 16% to 20% potassium feldspar, and 27% to 30% calcined kaolin.

[0008] Preferably, in step S2, temperature measuring points are set at different preset lengths in the horizontal and vertical directions on the inner side of the high-temperature kiln, an S-type thermocouple is set at each temperature measuring point, and the temperature in the kiln is measured once at a preset time interval T; wherein the number of temperature measuring points at the same height is not less than 4, and there are more than two different heights.

[0009] Preferably, in step S3, before the mixed material is charged into the high-temperature kiln, a layer of recycled material is preliminarily charged into the inner side of the high-temperature kiln.

[0010] Preferably, in step S4, the mixed material in the furnace body is heated by the graphite electrode plate during the melting process.

[0011] Preferably, in step (4) of step S5, the heat uniformity value at the corresponding height is determined by the reciprocal of the sum of two difference means calculated at the corresponding height.

[0012] Preferably, in step (4) of step S5, the temperature change rate of the temperature measuring point is determined by the ratio of the temperature difference between the current moment and the previous moment and the acquisition time interval.

[0013] Preferably, in step (4) of step S5, the first temperature rise moment of the temperature measuring point is the previous collection moment with the largest temperature rise between collection moments among all collection moments of the temperature measuring point.

[0014] Preferably, the method for adjusting the position height of the graphite electrode by using the temperature uniformity value and the heat uniformity value includes: The sum of the temperature uniformity value and the heat uniformity value at each height is calculated as the movable parameter of the graphite electrode at the corresponding height, and the threshold value of the movable parameters of the graphite electrode at all heights is obtained by combining the cross-validation method; When the motor movable parameter is greater than or equal to the above threshold, the graphite electrode drive motor control system issues a graphite electrode movement instruction; On the contrary, the height of the graphite electrode is maintained to continue heating.

[0015] Preferably, in step S6, when the material inside the furnace body is naturally cooled and crystallized, a layer of recycled material with uniform thickness is added to the furnace surface; when the surface temperature of the furnace body is lower than 50° C., the furnace is opened and the material is discharged.

[0016] Beneficial effect: In the above scheme, the present application measures the temperature at different heights during the melting process of artificial synthetic mica, analyzes the characteristics of temperature changes, obtains evaluation parameters for the heating conditions of the materials inside the furnace, and thus solves the problem of deviation in the judgment of the uniform heating of the materials due to the difference in heat transfer speed and the delay in temperature measurement during the melting process of artificial synthetic mica. The present application accurately judges the uniform heating of the materials in the furnace, and adjusts and controls the height of the graphite electrode using a drive motor control system according to the judgment result, thereby solving the problem that when the current lifting graphite electrode is used for melting artificial synthetic mica, the adjustment of the height of the graphite electrode does not take into account the heating conditions of the mica material, resulting in uneven heating of the mica material in the furnace, thereby improving the production quality of artificial synthetic mica. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A production process flow chart of artificial synthetic mica provided in this application; Figure 2 A flow chart of a method for adjusting the height of a graphite electrode according to changes in material temperature provided in this application. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the production and preparation process of an artificial synthetic mica proposed in the present application, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0020] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0021] In order to solve the problem of uneven heating of mica materials during the melting process, it is necessary to measure and monitor the temperature of the materials in the high-temperature kiln. During the heating process, since the heat source is the discharge at the tip of the graphite electrode, the first heated position of the material in the furnace is the center of the top of the material, and as the heating proceeds, the heat diffuses from the middle to the surroundings and from the top to the bottom. Since the material is a mixture, the heat transfer speed may vary to a certain extent, so there will be a certain delay in measuring the temperature of the material, that is, when the heat is transferred to the surroundings, the heat in the middle is already far greater than the heat around. If the temperature of the material at the center of the furnace is judged based on the actual measured temperature, the actual temperature of the material may be judged due to the delay in measurement, which will ultimately affect the production quality of artificial synthetic mica.

[0022] Accordingly, the production process flow chart of a synthetic mica provided in this application is as shown in the attached Figure 1 As shown, the specific preparation process is as follows: S1: Materials for preparing synthetic mica are prepared in a weight percentage ratio and stirred and mixed; the materials include: fused magnesia, potassium fluorosilicate, potassium feldspar and calcined kaolin.

[0023] The following weight percentages of materials are used to prepare synthetic mica: 30% to 32% fused magnesia, 20% to 21% potassium fluorosilicate, 16% to 20% potassium feldspar, and 27% to 30% calcined kaolin. The prepared materials are put into a mixer and stirred for 15 to 45 minutes.

[0024] Among them, in this embodiment 1, the materials and their weight percentages for preparing artificial synthetic mica are: 30% fused magnesia, 20% potassium fluorosilicate, 19% potassium feldspar, and 30% calcined kaolin.

[0025] In Example 2, the materials used to prepare the synthetic mica and their weight percentages are: 31% fused magnesia, 21% potassium fluorosilicate, 17% potassium feldspar, and 28% calcined kaolin.

[0026] In Example 3, the materials used to prepare the synthetic mica and their weight percentages are: 32% fused magnesia, 20% potassium fluorosilicate, 16% potassium feldspar, and 27% calcined kaolin.

[0027] It should be noted that, generally, bulk potassium feldspar needs to be sorted and crushed to obtain potassium feldspar particles with a particle size of less than 40 mesh, which are used as the material in this embodiment. , , And other ingredients.

[0028] In addition, the calcined kaolin is obtained by calcining kaolin at a temperature of 950-1150°C for 0.5 hours, and then crushing to obtain calcined kaolin particles with a particle size of less than 40 mesh, which are used as the material of this application. The purpose of introducing calcined kaolin is to remove the crystal water and organic impurities in kaolin. The calcined kaolin is mainly introduced , and a small amount .

[0029] S2: A temperature measuring device is installed in the high-temperature kiln to collect material temperature data at the temperature measuring points during the melting process.

[0030] In the above-mentioned high-temperature kiln, temperature measuring points are arranged at different preset lengths in the horizontal and vertical directions around the inner side of the kiln, and each temperature measuring point is provided with an S-type thermocouple, and the temperature in the kiln is measured once every preset time T. In this embodiment, a temperature measuring point is arranged at every 80 cm in the horizontal direction and 50 cm in the vertical direction, and the temperature in the kiln is measured once every 5 minutes.

[0031] It should be noted that the setting interval and the temperature measurement interval time of the temperature measurement points are not unique. The implementer can consider factors such as the size of the high-temperature kiln used in the actual artificial synthesis of mica and the total amount of synthetic mica materials, and ensure that there are more than or equal to 4 temperature measurement points at the same height, as well as temperature measurement points at different heights, to ensure the comprehensiveness of the material temperature measurement. That is, the material temperature at at least two heights needs to be measured, and there are at least 4 temperature measurement points at each height.

[0032] S3: Fill the mixed material into the high temperature kiln.

[0033] A layer of recycled materials is pre-filled on the inner side of the high-temperature kiln, wherein the recycled materials are formed by heating and melting the materials near the furnace wall, or are composed of materials that have not reacted completely before, and then the mixed materials prepared in step S1 are filled into the high-temperature kiln.

[0034] S4: Melting the mixed material in the furnace body.

[0035] The melting process is powered by a 10KV power supply, which is connected to the circuit breaker and transformer in sequence. The output power range of the transformer used is 400~600KVA. The transformer outputs three groups of AC power supplies, namely 380V, 220V, and 110V. The three groups of power supplies output by the transformer are connected to three switch cabinets one by one. The three switch cabinets are then connected to the control cabinet. The power output from the control cabinet is connected to three graphite electrode plates to heat the mixed material in the furnace body.

[0036] The melting process includes: Arc starting: Connect the electrode to a 380V AC power supply and adjust the input power from zero to 120KW gradually. The duration is 40 to 60 minutes.

[0037] After arcing, the electrode is disconnected from the 380V AC power supply and connected to the 220V AC power supply, and the input power is adjusted to gradually increase from 120KW to 260KW.

[0038] When the input power reaches 260KW, the electrode is disconnected from the 220V A-type power supply and connected to the 110V AC power supply, and the input power is adjusted to gradually increase from 260KW to 400KW.

[0039] During the melting process when the electrodes are connected to 220V AC power and 110V AC power, each time the furnace surface sinks, mixed materials are added to the furnace surface and the melt temperature is controlled between 1400°C and 1600°C.

[0040] Insulation: When all the added mixed materials are melted, add a layer of recycled materials with uniform thickness to the furnace surface and enter the insulation stage. At this time, when the electrode is connected to a 110V AC power supply, adjust the input power from 400KW to 80KW gradually.

[0041] S5: During the melting process, adjust the height of the graphite electrode according to the temperature change of the material according to the following steps.

[0042] Under normal circumstances, when the material at the same height in the furnace reaches its melting temperature, there is no need to continue heating it. Instead, it is kept warm until it is completely melted. At this time, the graphite electrode can be moved downward, so that the lower material can receive more heat for melting. However, due to the delay in temperature measurement, when the temperature measurement values ​​of the surrounding materials reach the melting temperature, the temperature of the material in the central area may have far exceeded the melting temperature due to continuous heating, which may cause serious overheating of the melt and high loss of fluoride. Therefore, it is necessary to predict and analyze the temperature of the material, and then move the graphite electrode downward in advance while ensuring that the material at the current height can reach the melting temperature and keep warm.

[0043] For materials at the same height, as heating proceeds, the temperature diffusion rate and temperature rise data are relatively similar. Therefore, the data collected by the thermocouples at the same height on the inner side of the high-temperature kiln will normally increase gradually first and then gradually stabilize. If the temperature change difference of the materials at the same height is small, and the temperature change trend is consistent with the temperature change of the normal melting process, it means that the material is heated normally and will reach the melting temperature within the expected time; on the contrary, if the temperature change difference of the materials at different locations is large, and the temperature change trend is greatly different from the temperature change of the normal melting process, it means that the material may be heated unevenly at this time, and a certain degree of heating is required.

[0044] Accordingly, during the melting process of step S4, the method for adjusting the height of the graphite electrode according to the change in material temperature is shown in the attached flow chart. Figure 2 As shown, specifically including: (1) The temperature data collected at each temperature measurement point is used to predict the temperature at N future moments. The edit distance between the predicted temperatures of any two temperature measurement points at the same height is used as the difference measure. The mean of all difference measure results at the same height is used as the temperature trend anomaly. In order to characterize the temperature change of the above-mentioned materials, this application first takes the material temperature at a certain height as an example, and predicts the temperature value of each temperature measuring point in combination with the prediction algorithm. The prediction result is the temperature data of the N moments after the current temperature sampling moment. In this embodiment, the ARIMA model is used to predict the temperature data. In other embodiments, other suitable algorithms such as exponential smoothing can also be used. In this embodiment, N is 50. If sufficient data cannot be obtained, no processing is performed. In addition, the implementer can select other values ​​while ensuring that data contingency is avoided.

[0045] Then, the predicted temperatures of any two temperature measuring points at the same height are compared. In this application, the edit distance is used as a measure of the difference between the predicted temperatures of the temperature measuring points. The implementer can use other difference measures while ensuring the accuracy of the difference comparison, such as: Euclidean distance, the inverse of the Pearson correlation coefficient, etc.

[0046] Finally, the mean of all difference measurement results at this height is used to measure the approximate temperature trend of the temperature measuring point at this height at the current moment, and it is used as the temperature trend anomaly at this height at the current moment.

[0047] (2) Analyze the temperature rise trend of the temperature data collected at each temperature measurement point, calculate the average temperature rise trend of all temperature measurement points at the same height; sum the differences between the average temperature rise trends at different heights as the temperature rise anomaly; In addition, since the position of the graphite electrode is constantly moving downward, the heat transfer of the material at each height is transferred from the middle to the surrounding areas, so the temperature change trend of the material at each height is relatively similar.

[0048] Based on this, for the temperatures collected at each temperature measuring point at each altitude, a trend analysis algorithm is used to analyze the temperature rising trend of each temperature measuring point, and the mean temperature rising trend at all temperature measuring points at the same altitude is calculated. The differences between the mean temperature rising trends at different altitudes are summed up as the temperature rising anomaly value to measure the degree of abnormality of the temperature rising trend.

[0049] In this embodiment, the STL decomposition algorithm in the known technology is used to analyze the temperature trend, and the specific process is not repeated. At the same time, in this embodiment, the difference between the mean values ​​of the temperature increase trend at different heights is the absolute difference between the mean values ​​of the temperature increase trend at different heights.

[0050] (3) The reciprocal of the sum of the above-mentioned temperature trend abnormal value and the temperature rise abnormal value is taken as the uniform value of the material temperature at the corresponding height.

[0051] Furthermore, the inverse of the sum of the above-mentioned temperature trend abnormal value and the temperature rise abnormal value is used as the uniformity value of the material temperature at the current moment and the current height, which is used to measure whether there is any abnormality in the melting and heating of the material in the current furnace and whether the temperature of the material is uniform, and can be used as the control parameter of the graphite electrode height to provide parameter support for the adjustment of the graphite electrode height.

[0052] (4) Determine the heat uniformity value at the corresponding height by combining the mean difference in temperature change rate between all temperature measurement points at the same height and the mean difference in the time of the first temperature rise.

[0053] Generally, there are certain differences in the structure of the high-temperature kilns used for synthetic mica. Some high-temperature kilns have narrower tops and wider middle and lower parts, while others have narrower upper and lower parts and wider middle parts. These designs are all intended to improve the utilization and efficiency of heating heat. However, such designs also result in the narrower parts containing less material, so that less time is required for heat to be transferred from the middle to the surroundings during heating. Therefore, the overall material heating speed in the narrower area of ​​the kiln is faster, less heat is required, and the graphite electrode needs to stay for less time. At this time, the temperature rise trend of the material in the narrower part is significantly different from that of the material in the wider part. The uniformity value of the material temperature calculated only by analyzing step (3) is low, which may lead to deviations in the judgment of the uniformity of the material temperature, and thus further correction is required.

[0054] For materials at the same height, under the condition of normal heat transfer, the temperature rise rate of the materials at various locations is balanced and similar, and the time when the temperature rises is relatively close. After the normal heat transfer is completed, the materials at this height are heated more evenly.

[0055] According to the above analysis of the temperature rise, for each temperature measuring point at the same height, the temperature change rate of any temperature measuring point is obtained, and the calculation method is the ratio of the temperature difference between the current moment and the previous moment of the temperature measuring point and the acquisition time interval. And the first temperature rise moment of the temperature measuring point is obtained, and the calculation method is the previous acquisition moment with the largest temperature rise between the acquisition moments among all the acquisition moments of the temperature measuring point. For example: among all the acquisition moments of the temperature measuring point, when the temperature rise between the u-1 moment and the u-th moment is the largest, the u-1 moment is taken as the first temperature rise moment of the temperature measuring point.

[0056] Then calculate the difference in temperature change rates between any two temperature measuring points, as well as the difference in the first temperature rise time; finally, sum the mean differences in all temperature change rates and the mean differences in the first temperature rise time, and use the inverse of the summation result as an evaluation parameter to measure the uniform heating of materials at the same height, recorded as the heat uniformity value.

[0057] The difference in temperature change rate and the difference in the first temperature rise time are respectively the absolute difference in temperature change rate of the arbitrary two temperature measuring points and the absolute difference in the first temperature rise time of the arbitrary two temperature measuring points.

[0058] The above-mentioned heat uniformity value can be used to measure whether the material is heated uniformly at each current height, and can then be used as a height control parameter of the graphite electrode to provide parameter support for adjusting the height of the graphite electrode.

[0059] (5) Use the temperature uniformity value and heat uniformity value to adjust the position height of the graphite electrode.

[0060] In the graphite electrode drive motor control system, the temperature uniformity value and the heat uniformity value at each height are calculated based on the actual collected temperature conditions, and the sum of the two is used as the movable parameter of the graphite electrode at the current height. The movable parameters of the graphite electrode at all heights are combined with the cross-validation method to obtain their thresholds, wherein the cross-validation method is a well-known technology and will not be repeated in this application.

[0061] The more evenly the material at the current height in the furnace is heated, the larger the calculated movable parameter of the motor is, indicating that the material in the furnace is heated more evenly at this time. That is, when the movable parameter of the motor is greater than or equal to the above threshold, the graphite electrode drive motor control system issues a graphite electrode movement instruction. After receiving the movement instruction, the motor controller sends a control signal. The driver converts the control signal sent by the controller into the voltage and current signals required by the motor. Finally, the actuator controls the motor rotation according to the voltage and current signals, thereby realizing the downward movement of the graphite electrode.

[0062] On the contrary, when the movable parameter of the motor is less than the above threshold, it means that the heating of the material at the current height is not complete and the height of the graphite electrode needs to be maintained for continued heating; therefore, the motor is controlled to stop rotating and the current height of the graphite electrode is maintained to continue heating the material.

[0063] S6: After melting is completed, the power supply is stopped to allow the material inside the furnace to cool and crystallize naturally.

[0064] After the power outage, the input power drops to zero, the drive motor control system issues a motor withdrawal command, sets the graphite electrode's upward height to exceed the height of the high-temperature kiln, and the motor controller, driver, and actuator control the motor to reverse according to the control signal to withdraw the graphite electrode from the kiln. The material inside the furnace body begins to automatically cool and crystallize. During the natural cooling and crystallization process, adding a layer of recycled material with uniform thickness on the furnace surface can serve as an insulation layer to extend the cooling time of the material inside the furnace body.

[0065] S7: Open the furnace and discharge the material to obtain artificial synthetic mica.

[0066] When the furnace surface temperature is lower than 50°C, unsintered powder, recycled materials and other insulation materials are removed, and the synthetic mica is taken out by punching, pickaxing and other methods, and the mica is crushed, screened, packaged and stored, completing a production and preparation process of artificial synthetic mica.

[0067] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0068] It should be noted that, unless otherwise specified and limited, terms such as "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, an element defined by the sentence "including one..." does not exclude the existence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items.

[0069] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not invented by the present application.

[0070] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A production process for synthetic mica, characterized in that: The following steps are involved: S1: mixing materials for preparing synthetic mica according to weight percentage and stirring and mixing; in Materials include: fused magnesia, potassium fluorosilicate, potassium feldspar and calcined kaolin; S2: A temperature measuring device is installed in the high-temperature kiln to collect material temperature data at the temperature measuring points during the melting process; S3: Filling the mixed material into a high temperature kiln; S4: Melting the mixed material in the furnace body; S5: During the melting process, adjust the height of the graphite electrode according to the temperature change of the material according to the following steps: (1) The temperature data collected at each temperature measurement point is used to predict the temperature at N future moments. The edit distance between the predicted temperatures of any two temperature measurement points at the same height is used as the difference measure. The mean of all difference measure results at the same height is used as the temperature trend anomaly. (2) Analyze the temperature rise trend of the temperature data collected at each temperature measurement point, calculate the average temperature rise trend of all temperature measurement points at the same height; sum the differences between the average temperature rise trends at different heights as the temperature rise anomaly; (3) The reciprocal of the sum of the above-mentioned temperature trend abnormal value and the temperature rise abnormal value is taken as the uniform value of the material temperature at the corresponding height; (4) Determine the heat average value at the corresponding height by combining the mean difference of the temperature change rate between all temperature measurement points at the same height and the mean difference of the first temperature rise time; (5) Use the temperature uniformity value and heat uniformity value to adjust the position height of the graphite electrode; S6: After melting is completed, the power supply is stopped to allow the material inside the furnace to cool and crystallize naturally; S7: Open the furnace and discharge the material to obtain artificial synthetic mica.

2. The production process of artificial synthetic mica according to claim 1, characterized in that: In step S1, the weight percentages of the materials are: 30% to 32% of fused magnesia, 20% to 21% of potassium fluorosilicate, 16% to 20% of potassium feldspar, and 27% to 30% of calcined kaolin.

3. The production process of artificial synthetic mica according to claim 1, characterized in that: In step S2, temperature measuring points are set at different preset lengths in the horizontal and vertical directions on the inner side of the high-temperature kiln, an S-type thermocouple is set at each temperature measuring point, and the temperature in the kiln is measured once at a preset time interval T; wherein the number of temperature measuring points at the same height is not less than 4, and there are more than two different heights.

4. The process for producing artificial synthetic mica according to claim 1, characterized in that: In step S3, before the mixed material is charged into the high temperature kiln, a layer of recycled material is preliminarily charged into the inner side of the high temperature kiln.

5. The production process of artificial synthetic mica according to claim 1, characterized in that: In step S4, the mixed material in the furnace is heated by the graphite electrode plate during the melting process.

6. The process for producing artificial synthetic mica according to claim 1, characterized in that: In step (4) of step S5, the heat average value at the corresponding height is determined by the reciprocal of the sum of the two difference means calculated at the corresponding height.

7. The process for producing artificial synthetic mica according to claim 6, characterized in that: In step (4) of step S5, the temperature change rate of the temperature measuring point is determined by the ratio of the temperature difference between the current moment and the previous moment and the acquisition time interval.

8. The process for producing artificial synthetic mica according to claim 6, characterized in that: In step (4) of step S5, the first temperature rise moment of the temperature measuring point is the previous collection moment with the largest temperature rise between collection moments among all collection moments of the temperature measuring point.

9. The process for producing artificial synthetic mica according to claim 1, characterized in that: The method of adjusting the position height of the graphite electrode by using the temperature uniformity value and the heat uniformity value includes: The sum of the temperature uniformity value and the heat uniformity value at each height is calculated as the movable parameter of the graphite electrode at the corresponding height, and the threshold value of the movable parameters of the graphite electrode at all heights is obtained by combining the cross-validation method; When the motor movable parameter is greater than or equal to the above threshold, the graphite electrode drive motor control system issues a graphite electrode movement instruction; On the contrary, the height of the graphite electrode is maintained to continue heating.

10. The process for producing artificial synthetic mica according to claim 1, characterized in that: In step S6, when the material inside the furnace body is naturally cooled and crystallized, a layer of recycled material with uniform thickness is added to the furnace surface; when the surface temperature of the furnace body is lower than 50° C., the furnace is opened and the material is discharged.

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