Method for preparing ultra-slender stone powder through ball milling method

Abstract

The invention relates to the technical field of feldspar powder preparation, and discloses a method for preparing ultra-slender stone powder by a ball milling method, which comprises the following steps: mixing feldspar particles with a grinding medium, carrying out ball milling treatment under the protection of inert gas, adding a dispersing agent, and carrying out stage treatment and surface modification to optimize the performance of the powder. According to the method, zirconium oxide balls are selected as a grinding medium, technological parameters are controlled, and a protective atmosphere is introduced, so that the phenomena of equipment abrasion and powder agglomeration are effectively reduced, and meanwhile, the purity and dispersity of the powder are improved. The method can accurately control the particle size range, remarkably improves the quality and application performance of the ultra-slender stone powder, has the advantages of being easy and convenient to operate, high in production efficiency and remarkable in economic benefit, and provides an innovative solution for preparation of the ultra-slender stone powder.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of feldspar powder preparation, in particular to a method for preparing superfine feldspar powder by a ball milling method. BACKGROUND

[0002] Feldspar powder is an important industrial raw material and is widely used in the fields of ceramics, glass, coatings and the like. Superfine feldspar powder has a small particle size and a large specific surface area and exhibits more excellent physical and chemical properties, so that the quality and performance of products can be significantly improved. There are many methods for preparing superfine feldspar powder, and the ball milling method is concerned due to simple operation, low cost and easy scale production. The ball milling method can refine feldspar particles to micron or even nanometer level through mechanical force, and the particle size distribution and morphology characteristics of the powder can be controlled by adjusting process parameters.

[0003] However, the existing ball milling method for preparing superfine feldspar powder still has certain limitations in actual application. For example, during a long grinding process, the wear of equipment can introduce impurities, affecting the purity of feldspar powder; in addition, the selection and ratio of grinding media have a great influence on the performance of the powder, and if not properly selected, it can lead to increased energy consumption or aggravated powder agglomeration. To solve these problems, some manufacturers use high-precision separation equipment or special surface treatment technology, but these methods often come with high equipment investment and operating costs, which form a certain economic pressure on enterprises. SUMMARY

[0004] The purpose of the application is to provide a method for preparing superfine feldspar powder by a ball milling method, aiming to solve the problems of impurities introduced by equipment wear during the ball milling process, high energy consumption and serious powder agglomeration in the prior art.

[0005] The technical scheme adopted by the application is to provide a method for preparing superfine feldspar powder by a ball milling method, comprising the following steps: S100, mixing original feldspar particles and grinding media according to a preset ratio and loading them into a ball mill tank; S200, injecting inert gas into the ball mill tank to form a protective atmosphere, and sealing the ball mill tank through a sealing device; S300, starting the ball mill, adjusting the ball milling speed to a first preset value and running for a first preset time to preliminarily refine the feldspar particles; S400, adding an appropriate amount of dispersant during the ball milling process, adjusting the ball milling speed to a second preset value and continuing to run for a second preset time; S500, stopping the ball mill, taking out the mixture in the ball mill tank and separating the coarse particles and grinding media through a screening device; S600, classifying the separated feldspar powder to obtain superfine feldspar powder with a target particle size range; S700, surface modification treatment is performed on the classified superfine feldspar powder to reduce the agglomeration tendency of the powder.

[0006] In a possible implementation, the S100 specifically includes: S110, selecting a zirconia ball with a diameter of 5-10 mm as the grinding medium, and the density of the zirconia ball is 6.0 g / cm3; S120, mixing the original feldspar particles and the grinding medium at a mass ratio of 1:3; S130, loading the mixed material into the ball mill tank, and ensuring that the filling rate is less than 60% of the volume of the ball mill tank.

[0007] In a possible implementation, the S120 specifically includes: S121, weighing the mass of the original feldspar particles as 1 kg; S122, calculating the mass of the required grinding medium as 3 kg according to the mass ratio; S123, loading the original feldspar particles and the grinding medium into the ball mill tank in layers, and the thickness of each layer is controlled to be between 2 cm and 3 cm.

[0008] In a possible implementation, the S200 specifically includes: S210, injecting nitrogen into the ball mill tank at a flow rate of 10 L / min for a duration of 5 minutes; S220, detecting the pressure in the ball mill tank by using a pressure sensor, and stopping the gas injection when the pressure reaches 0.2 MPa; S230, sealing the opening of the ball mill tank by using a sealing ring, and applying a torque of 5 N·m by using a torque wrench to ensure the sealing effect.

[0009] In a possible implementation, the S300 specifically includes: S310, starting the ball mill, and setting the initial rotating speed as 100 rpm, and gradually increasing the rotating speed to a first preset value of 300 rpm; S320, maintaining the first preset rotating speed for a first preset time of 2 hours; S330, monitoring the vibration frequency of the ball mill tank by using a vibration sensor, and ensuring that the vibration frequency is stabilized in a range of 50 Hz-60 Hz.

[0010] In a possible implementation, the S400 specifically includes: S410, adding a dispersant during the ball milling process, and the dispersant is sodium polyacrylate, and the addition amount of the dispersant is 0.5% of the mass of the original feldspar particles; S420, adjusting the rotating speed of the ball mill to a second preset value of 400 rpm; S430, maintaining the second preset rotating speed for a second preset time of 1 hour.

[0011] In a possible implementation, the S500 specifically includes: S510, after stopping the ball mill, open the sealing device of the ball mill tank to release the pressure in the tank; S520, pour the mixture into a screening device, and the mesh size of the screen is 0.1 mm; S530, separate coarse particles and grinding media by vibrating the screening device, and the screening time is 10 minutes.

[0012] In a possible implementation, the S600 specifically includes: S610, send the separated feldspar powder into an air flow classifier for classification treatment; S620, set the air inlet pressure of the classifier to 0.5 MPa, and the rotating speed of the classification wheel to 3000 rpm; S630, collect the superfine feldspar powder with a particle size range of 1-10 μm.

[0013] In a possible implementation, the S700 specifically includes: S710, put the classified superfine feldspar powder into a stirring container; S720, add silane coupling agent KH-570, and the amount of the silane coupling agent is 1% of the mass of the feldspar powder; S730, stir in the stirring container at a rotating speed of 500 rpm for 30 minutes to complete the surface modification treatment.

[0014] In a possible implementation, the S720 specifically includes: S721, dissolve the silane coupling agent KH-570 in anhydrous ethanol to prepare a solution with a concentration of 5%; S722, uniformly spray the prepared solution on the surface of the superfine feldspar powder; S723, dry the modified feldspar powder by using an infrared drying device, and the temperature is set to 80 ℃, and the time is 2 hours.

[0015] The method for preparing superfine feldspar powder by the ball milling method has the beneficial effects that, compared with the prior art, the method optimizes the selection and proportioning of the grinding medium, reduces the influence of equipment wear on the purity of the feldspar powder, introduces a dispersant in the ball milling process, effectively reduces the agglomeration of the powder, and accurately controls the particle size distribution of the powder through grading treatment. In addition, the surface modification treatment further improves the dispersibility and stability of the superfine feldspar powder, significantly improves the application performance of the superfine feldspar powder in the fields of ceramics, glass and the like, and the like. The method also avoids the oxidation or other chemical reactions of the powder in the ball milling process through the setting of a protective atmosphere, thereby ensuring the quality consistency of the product. The overall process design is reasonable, the operation is simple, and the method has high production efficiency and economic benefits, and provides an innovative and practical solution for the preparation of superfine feldspar powder. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall process flowchart of the present application; Figure 2 is the detailed flowchart of the ball milling process of the present application; Figure 3 is the working flowchart of the air flow classifier of the present application; Figure 4 is the flowchart of the surface modification treatment of the present application. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] The present application provides a method for preparing superfine feldspar powder by ball milling, and the specific embodiments are combined with the drawings of the present application Figure 1 to the drawings Figure 4 are described in detail.

[0019] In the implementation of the present application, first of all, the original feldspar particles and grinding medium need to be prepared and mixed in a certain proportion before being loaded into the ball mill tank. A sealing ring is provided at the opening of the ball mill tank to ensure the sealing effect during the ball milling process. The sealing ring is tightened by a torque wrench to apply a torque of 5 N·m to ensure a reliable sealing environment inside the ball mill tank. In addition, a pressure sensor is installed on the ball mill tank to monitor the pressure change in the tank in real time. In the S100 step, zirconia balls with a diameter of 5-10 mm are selected as the grinding medium, with a density of 6.0 g / cm³. The original feldspar particles are mixed with the grinding medium in a mass ratio of 1:3, for example, 1 kg of original feldspar particles are mixed with 3 kg of zirconia balls. The mixed material is layered and loaded into the ball mill tank, with a thickness control of 2-3 cm, and the filling rate of the ball mill tank is ensured to be less than 60% of its volume. This operation aims to optimize the movement trajectory of the material in the ball milling process and avoid the reduction of grinding efficiency due to excessive filling.

[0020] After completing the material loading, the S200 step is entered, that is, inert gas is injected into the ball mill tank to form a protective atmosphere. The specific operation is to inject nitrogen into the ball mill tank, with a flow rate of 10 L / min and a duration of 5 minutes. The pressure in the ball mill tank is detected by the pressure sensor, and the gas injection is stopped when the pressure reaches 0.2 MPa. At this time, the sealing ring has been tightened in place by the torque wrench, ensuring that a stable protective atmosphere is formed inside the ball mill tank. This protective atmosphere can effectively prevent the oxidation or other chemical reactions of feldspar powder during the ball milling process, thereby ensuring the purity and quality consistency of the product.

[0021] Then enter the S300 step, start the ball mill and adjust the ball milling speed. The initial speed is set to 100 rpm, gradually increased to the first preset value of 300 rpm, and maintained at this speed for 2 hours. In this process, the vibration frequency of the ball mill tank is monitored by the vibration sensor to ensure that it is stable within the range of 50-60 Hz. This operation can ensure that the material is subjected to uniform impact and grinding during the ball milling process, thereby preliminarily refining the original feldspar particles. During the ball milling process, the zirconia balls act as grinding media, with high density and moderate diameter design, which can generate sufficient impact force in the ball mill tank, while reducing the impact of equipment wear on the purity of feldspar powder.

[0022] In step S400, the ball milling process is further optimized to reduce the powder agglomeration phenomenon. The specific operation is to add a dispersing agent during the ball milling process. The dispersing agent is sodium polyacrylate, and the addition amount is 0.5% of the mass of the original feldspar particles. After adding the dispersing agent, the ball milling speed is adjusted to a second preset value of 400 rpm, and the speed is maintained for 1 hour. The role of the dispersing agent is to reduce the van der Waals force between the powder particles, thereby effectively reducing the occurrence of agglomeration. At the same time, a higher ball milling speed helps to further refine the feldspar particles and improve the uniformity of the powder.

[0023] After the ball milling is completed, step S500 is entered, that is, the ball mill is stopped and the mixture in the ball mill tank is taken out. First, the pressure in the ball mill tank is released, and then the mixture is poured into a screening device for separation. The screening device uses a screen with a pore size of 0.1 mm, and the coarse particles and grinding media are separated by vibrating the screening device for 10 minutes. This operation ensures that the coarse particles and grinding media are effectively separated, thereby obtaining the initially refined feldspar powder.

[0024] Next, step S600 is entered, and the separated feldspar powder is subjected to classification treatment. The feldspar powder is fed into an air classifier for particle size classification. The air classifier is provided with a classification wheel, and the particle size of the powder is accurately controlled by adjusting the air inlet pressure and the classification wheel speed. The specific operation is to set the air inlet pressure of the air classifier to 0.5 MPa, the classification wheel speed to 3000 rpm, and collect the ultra-fine feldspar powder with a particle size range of 1 μm-10 μm. During the classification process, the air classifier uses the centrifugal field generated by the high-speed rotating classification wheel to separate powders of different particle sizes, thereby achieving accurate control of the target particle size range.

[0025] Finally, step S700 is entered, and the classified ultra-fine feldspar powder is subjected to surface modification treatment. The ultra-fine feldspar powder is placed in a stirring container and modified with silane coupling agent KH-570. The amount of silane coupling agent KH-570 is 1% of the mass of the feldspar powder, and the specific operation is to dissolve KH-570 in anhydrous ethanol to prepare a solution with a concentration of 5%. The prepared solution is uniformly sprayed on the surface of the ultra-fine feldspar powder through a spraying device, and then stirred in the stirring container at a speed of 500 rpm for 30 minutes to make the silane coupling agent fully coat the surface of the powder. After modification, the feldspar powder is dried by an infrared drying device, with a temperature setting of 80°C and a time of 2 hours. The infrared drying device quickly removes the solvent on the surface of the powder by radiation heating, thereby completing the surface modification treatment.

[0026] The connection relationship and position relationship between each part in the whole process are carefully designed. For example, the sealing ring of the ball mill tank cooperates with the pressure sensor to ensure the sealing and pressure stability during the ball milling process. The classification wheel of the air flow classifier cooperates with the air inlet system to realize accurate control of the particle size of the powder. The stirring container, the spraying device and the infrared drying device jointly constitute the core device of the surface modification treatment, and through reasonable arrangement and operation sequence, the uniformity and stability of the modification effect are ensured.

[0027] As can be seen from the above specific embodiments, the present application reduces the influence of equipment wear on the purity of feldspar powder by optimizing the selection and proportioning of grinding media. At the same time, a dispersing agent is introduced during the ball milling process, effectively reducing the agglomeration of the powder, and the particle size distribution of the powder is accurately controlled through classification processing. In addition, the surface modification treatment further improves the dispersibility and stability of the ultra-fine feldspar powder, significantly improving its application performance in the fields of ceramics, glass and the like. The overall process design is reasonable, the operation is simple, and it has high production efficiency and economic benefits, providing an innovative and practical solution for the preparation of ultra-fine feldspar powder.

[0028] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing ultrafine feldspar powder by ball milling, characterized in that: The following steps are involved: S100, mixing the original feldspar particles and the grinding media in a mass ratio of 1:3 and then loading the mixture into a ball mill, with the filling rate not exceeding 60% of the volume of the ball mill; S200, injecting nitrogen into the ball mill at a flow rate of 10 L / min for 5 minutes, detecting the pressure in the ball mill by a pressure sensor, stopping the gas injection when the pressure reaches 0.2 MPa, and sealing the ball mill with a sealing ring; S300, starting the ball mill, setting the initial speed to 100 rpm, gradually increasing it to a first preset value of 300 rpm and running it for a first preset time of 2 hours; S400, adding a dispersant during the ball milling process, wherein the dispersant is sodium polyacrylate, and the added amount is 0.5% of the mass of the original feldspar particles, adjusting the ball mill speed to a second preset value of 400 rpm and continuing to run for a second preset time of 1 hour; S500, stop the ball mill, take out the mixture in the ball mill jar and separate the coarse particles and grinding media through a screening device, the sieve aperture is 0.1 mm, and the screening time is 10 minutes; S600, sending the separated feldspar powder to an air classifier for classification treatment, setting the air inlet pressure of the classifier to 0.5 MPa, the classifying wheel speed to 3000 rpm, and collecting ultrafine feldspar powder with a particle size range of 1 μm-10 μm; S700: Surface modification treatment was performed on the classified ultrafine feldspar powder. A silane coupling agent KH-570 was added in an amount of 1% of the mass of the feldspar powder. The mixture was stirred in a stirring container at a speed of 500 rpm for 30 minutes.

2. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The S100 specifically includes: S110, select zirconia balls with a diameter of 5mm-10mm as grinding media, with a density of 6.0g / cm³; S120, weighing the mass of the original feldspar particles to be 1 kg, and calculating the mass of the required grinding medium to be 3 kg based on the mass ratio; S130, the original feldspar particles and the grinding media are loaded into the ball mill in layers, and the thickness of each layer is controlled between 2 cm and 3 cm.

3. The method for preparing ultrafine feldspar powder by ball milling according to claim 2, characterized in that: The S120 specifically includes: S121. Weigh the mass of the original feldspar particles to be 1 kg; S122. The mass of the grinding medium required is calculated to be 3 kg based on the mass ratio; S123. The original feldspar particles and the grinding media are loaded into the ball mill in layers, and the thickness of each layer is controlled between 2 cm and 3 cm.

4. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The S200 specifically includes: S210, injecting nitrogen into the ball mill jar at a flow rate of 10 L / min for 5 minutes; S220, detecting the pressure in the ball mill tank through a pressure sensor, and stopping gas injection when the pressure reaches 0.2 MPa; S230. Use a sealing ring to seal the opening of the ball mill jar, and apply a torque of 5 N·m using a torque wrench.

5. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The S300 specifically includes: S310, start the ball mill, set the initial speed to 100 rpm, and gradually increase it to a first preset value of 300 rpm; S320, maintaining the first preset speed for a first preset time of 2 hours; S330, monitor the vibration frequency of the ball mill jar through a vibration sensor to ensure that it is stable within the range of 50Hz-60Hz.

6. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The S400 specifically includes: S410, adding a dispersant during the ball milling process, wherein the dispersant is sodium polyacrylate, and the amount added is 0.5% of the mass of the original feldspar particles; S420, adjusting the ball milling speed to a second preset value of 400 rpm; S430: Maintain the second preset speed for a second preset time of 1 hour.

7. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The S700 specifically includes: S710, placing the classified ultrafine feldspar powder into a mixing container; S720, dissolve the silane coupling agent KH-570 in anhydrous ethanol to prepare a 5% solution, and evenly spray it on the surface of the ultrafine feldspar powder; S730, drying the modified feldspar powder by an infrared drying device, with the temperature set at 80° C. and the time being 2 hours.

8. The method for preparing ultrafine feldspar powder by ball milling according to claim 7, characterized in that: The S720 specifically includes: S721, dissolving silane coupling agent KH-570 in anhydrous ethanol to prepare a solution with a concentration of 5%; S722, spraying the prepared solution evenly on the surface of the ultrafine feldspar powder; S723. Dry the modified feldspar powder using an infrared drying device at a temperature of 80° C. for 2 hours.

9. The method for preparing ultrafine feldspar powder by ball milling according to claim 1, characterized in that: The ball mill jar is provided with a sealing ring and a pressure sensor, which are used for sealing and pressure detection respectively.

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