CN112658244A - Zinc-aluminum alloy flake powder and preparation method thereof - Google Patents
Zinc-aluminum alloy flake powder and preparation method thereof Download PDFInfo
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Abstract
The invention relates to zinc-aluminum alloy flake powder and a preparation method thereof, wherein the zinc-aluminum alloy flake powder comprises the following components in percentage by weight: zn: 70% -97%, Al: 3% -30% of coating agent: 2-4%, wherein the lead and cadmium contents are both less than 50ppm, the total impurity content is not more than 0.01%, the average sheet diameter of the zinc-aluminum alloy sheet powder is 5-20 μm, the sheet thickness is 0.1-0.3 μm, and the ratio of the diameter to the thickness is 50-200; the product is used for preparing environment-friendly chromium-free zinc-aluminum coating liquid, the coating liquid does not generate gas, the viscosity change is small, the stability is good, the diameter and the thickness ratio of the product sheet are large, and the preparation of a compact and fine coating is facilitated, so that the corrosion resistance of the coating is facilitated to be improved, and the smooth and moist workpiece surface is obtained; the binary alloy has simple components, the salt spray resistance time of the coating can reach more than 1000 hours without adding other elements and expensive rare earth elements, the process is simple, intermediate alloy preparation and vacuum melting atomization are not required, the surface modifier is reasonably selected, the product is easily dispersed in the coating, the suspension property is good, the coating is not easy to generate gas, the stability of the coating is good, the raw material cost and the processing cost are low, and the market competitiveness of the product is strong.
Description
Technical Field
The invention relates to the field of metal powder deep processing, in particular to zinc-aluminum alloy flake powder and a preparation method thereof.
Background
The zinc-aluminum coating technology is a novel steel surface high-efficiency anticorrosion technology developed in China in the last two decades, and comprises a zinc-aluminum coating liquid (Dacromet coating liquid) preparation technology and a coating technology. The Dacromet coating liquid mainly comprises pure zinc flake powder, pure aluminum flake powder, an emulsifier dispersant and a passivating agent which takes chromic acid as a raw material. The corrosion resistance is good, and the salt spray resistance time can reach more than 1000 h. Pure zinc flake powder and pure aluminum flake powder are produced ordinary dacromet (containing Cr)+6Ions) as the primary starting material. In recent years, Dacromet coating liquid contains a large amount of toxic Cr+6Ions are restricted from use and instead a Cr-free one+6Ionic, chromium-free Dacromet coating solutions.
Meanwhile, the chinese invention patent CN103357867B provides a scaly multi-element zinc-aluminum alloy powder and a preparation method thereof, wherein the thickness of the scaly multi-element zinc-aluminum alloy powder is 0.1-1 μm, the average flake diameter is 5-35 μm, and the specific composition of the particle size is as follows: the flake diameter is less than 5 mu m and less than or equal to 20 percent, the flake diameter is 5-33 mu m and more than or equal to 70 percent, the flake diameter is more than 33 mu m and less than or equal to 10 percent, and the ratio of the average flake diameter to the thickness of the flake thickness of the flaky multi-element zinc-aluminum alloy powder is 35-200. The flaky metal powder and the preparation method thereof provided by the invention are particularly suitable for the fields of producing chromium-free Dacromet coating liquid, inorganic zinc-rich paint, heavy-duty anticorrosive paint and the like.
However, the patent needs to add other elements and expensive rare earth elements, has high price and complex production process, needs to prepare intermediate alloy, and needs vacuum melting and vacuum atomization.
Meanwhile, the pure zinc flake powder is used for producing the chromium-free environment-friendly Dacromet anticorrosive coating liquid, so that the stability is poor, the gas is easy to generate, the viscosity change is quick, and the quality guarantee period of the coating is short; the corrosion resistance is relatively poor, the salt spray resistance time is only 300-400 h, and the corrosion resistance time is only 1/3 of Dacromet containing chromium.
Therefore, the technical problems which need to be solved in the field are solved by providing the novel zinc-aluminum alloy flake powder and the preparation method thereof to take into account the advantages of the raw material cost and the processing cost of the chromium-free Dacromet coating liquid and the performance advantage of the product.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the chromium-free zinc-aluminum alloy flake powder meeting the price advantage and the performance advantage and the preparation method thereof so as to reduce the production cost of the chromium-free zinc-aluminum coating liquid and improve the stability and the corrosion resistance of the product.
The technical scheme adopted by the invention is as follows:
the zinc-aluminum alloy flake powder comprises the following components in percentage by weight: zn: 70% -97%, Al: 3% -30% of coating agent: 2-4%, wherein the total amount of impurities is not more than 0.01%, the average sheet diameter of the zinc-aluminum alloy sheet powder is 5-20 μm, the sheet thickness is 0.1-0.3 μm, and the ratio of the sheet diameter to the sheet thickness is 50-200.
Preferably, the bulk density of the zinc-aluminum alloy flake powder is 0.2-0.6g/cm3。
On the other hand, the invention also provides a preparation method of the zinc-aluminum alloy flake powder, which comprises the following steps:
(1) preparation of prealloyed superfine powder raw material
Adding a zinc ingot and an aluminum ingot into a smelting furnace according to the proportion of claim 1, smelting into molten alloy, introducing the molten alloy into a preheated tundish with a flow-limiting hole at the bottom, allowing the molten alloy to enter an atomizer at the top of an atomizing tank through the flow-limiting hole, atomizing the molten alloy in the atomizer by high-pressure inert gas of 3-5 MPa into spherical or spheroidal granular alloy powder, and classifying by an airflow classifier to obtain the granular alloy powder with the D50 of 3-10 mu m.
(2) Sheeting and surface modification
Taking granular alloy powder with the thickness of 3-10 mu m of D50 as a raw material, adding a grinding aid and a modification aid into a grinding machine, and grinding the granular alloy powder into sheet alloy powder with the thickness of 0.1-0.3 mu m of D50 by a dry grinding or wet grinding method; the grinding medium can be single specification or multiple specifications for compounding, a wet grinding mode is adopted for processing, the product uniformity is better, the modifier coating performance is better, solvent oil is required to be used as the wet grinding medium for wet grinding, the solvent oil can be reused, the oil-material ratio is usually 5-10L: 3-6 kg, a pasty product can be obtained by solid-liquid separation with a centrifuge or a filter press after wet grinding, dry powder can be obtained by drying and other processes of the pasty product, and the sheet-shaped alloy powder with the sheet thickness of 0.1-0.3 mu m and the surface coated with the modification aid can be obtained by the process.
(3) Dry powder post-treatment
Quantitatively adding the semi-finished flaky alloy powder into an airflow classifier protected by inert gas for classification, selecting a product with qualified granularity, and quantitatively sealing and packaging.
Preferably, the grinding aid and the modification aid comprise one or more of dispersing agent, stearic acid, stearate, stearic amide, glyceryl stearate, isopropyl palmitate and coupling agent.
Preferably, the addition amount of the grinding aid and the modification aid is 1-4% of the weight of the alloy powder.
Preferably, the grinding medium ball is zirconia, stainless steel or steel balls made of other materials, and the diameter of the grinding medium ball is 2-12 mm.
As a further scheme of the preparation method of the invention, the dry grinding method in the step (2) comprises the following steps:
(1) flaking grinding
2-6 m is selected3A horizontal roller ball mill, wherein the outer wall of the ball mill is provided with a jacket, the ground slurry is indirectly cooled by circulating cooling water, and the water temperature of a cooling water inlet is controlled to be 4-8 ℃; selecting a steel ball with the diameter of 8-20 mm as a grinding medium, wherein the ball loading amount is 4-10T; the granularity of the raw materials is controlled to be 10-20 mu m, and the adding amount of the raw materials is 500-1000 kg; the addition amount of the auxiliary agent is 2-5% of the amount of the metal; before grinding, vacuumizing and refilling nitrogen, ensuring that the pressure of the nitrogen in the ball mill is slightly higher than the environmental pressure, and controlling the pressure to be between 0.01 and 0.03 MPa; the working frequency of the ball mill is 15-45 Hz; the grinding time depends on the particle size of the raw material and the product specification and is usually 8-16 hours.
(2) Shaping of
In order to ensure the flatness of the sheet shape of the product, the product needs to be shaped after grinding; selecting 1-2 m3The polishing machine of (1); selecting a stainless steel ball with the thickness of 1-4 mm as a polishing ball, wherein the addition amount of the polishing ball is 1-3T; the treatment capacity of the flaky zinc-aluminum alloy powder of the semi-finished product is 200-500 kg; before polishing, vacuumizing and refilling nitrogen to ensure that the nitrogen pressure in the polishing mill is slightly higher than the environmental pressure, and generally controlling the nitrogen pressure to be between 0.01 and 0.03 MPa; the polishing frequency is 20-40 Hz, and the polishing time is 1-4 h.
(3) Grading
Grading the polished product by using an airflow grader, wherein the grading is protected by nitrogen; the grading feeding amount is controlled to be 60-100 kg; the working frequency of the first-stage grading impeller is 10-30 Hz, and the working frequency of the second-stage grading impeller is 25-40 Hz.
As a further embodiment of the preparation method of the present invention, the wet milling method in step (2) is:
(1) flaking grinding
Selecting 1-2 m3The method comprises the following steps that (1) a horizontal roller ball mill is adopted, a jacket is arranged on the outer wall of the ball mill, ground slurry can be indirectly cooled by circulating cooling water, and the water temperature of a cooling water inlet is controlled to be 4-8 ℃ generally; selecting a steel ball with the diameter of 2-8 mm as a grinding medium, wherein the ball loading amount is 1.5-3T; solvent oil is used as grinding fluid, cold welding and oxidation of alloy powder in the grinding process can be prevented, and the addition amount of the solvent oil is 500-1500L; the granularity of the raw materials is controlled to be 3-10 mu m, and the addition amount of the raw materials is 300-500 kg generally; the addition amount of the auxiliary agent is 2-5% of the amount of the metal; the working frequency of the ball mill is 20-45 Hz; in the grinding process, slurry is always pumped into a heat exchanger filled with cooling water through a slurry pump, the cooled slurry returns to the ball mill, and the slurry circulates in such a way, so that the temperature of the slurry can be effectively reduced, and the uniformity of a product is improved; the grinding time depends on the particle size of the raw material and the product specification and is usually 8-16 hours.
(2) Filter pressing solid-liquid separation
Pumping the ground slurry into a filter press for filter pressing; the filtrate can be used as grinding fluid for repeated use, and the obtained filter cake is a raw material for preparing a paste product.
(3) Kneading compound paste
Adding the filter cake into a kneader, and preparing a paste product by adding a proper amount of the kneader according to the requirements of users.
(4) Drying to obtain powder
If a powdery product is needed, putting the filter cake obtained in the step (3) into a vacuum drier for drying; the drying temperature is usually controlled to be between 60 and 200 ℃; the drying constant temperature time is usually 6-15 hours;
and (4) carrying out the same shaping and grading procedures as the dry grinding method on the dry powder obtained after drying to obtain finished products with various specifications.
Compared with the prior art, the invention has the following beneficial effects:
1. the product is used for preparing environment-friendly chromium-free zinc-aluminum coating liquid, and the coating liquid has the advantages of no gas generation, small viscosity change and good stability.
2. The product has small sheet diameter and large diameter-thickness ratio, and is beneficial to preparing compact and fine coatings, thereby being beneficial to improving the corrosion resistance of the coatings and obtaining smooth and moist workpiece surfaces;
3. the binary alloy is selected, the alloy components are simple, and the salt spray resistance time of the coating can reach more than 1000 hours without adding other elements and expensive rare earth elements;
4. the production process is simple in process, intermediate alloy does not need to be prepared, zinc ingots and aluminum ingots can be directly smelted into liquid alloy and then atomized into alloy powder by using nitrogen under normal pressure, and vacuum smelting and vacuum atomization are not needed;
5. the surface modifier is reasonably selected, the product is easy to disperse in the coating, the suspension property is good, the coating is not easy to generate gas, and the stability of the coating is good;
6. the raw material cost and the processing cost are low, and the market competitiveness of the product is strong.
Drawings
FIG. 1 is an external view of a powdery product of the present invention
FIG. 2 is an external view of a paste product of the present invention
FIG. 3 is a scanning electron microscope image of the powder product of the present invention
FIG. 4 is a scanning electron microscope image of the paste product of the present invention
FIG. 5 is a comparison of the front and back of a workpiece subjected to a salt spray corrosion resistance test.
Detailed Description
The specific preparation method of the zinc-aluminum alloy flake powder in the embodiment comprises the following steps:
preparation of prealloyed superfine powder raw material
Adding zinc ingots and aluminum ingots into a smelting furnace in proportion, smelting into molten alloy, introducing the molten alloy into a preheated tundish with a flow limiting hole at the bottom, allowing the molten alloy to enter an atomizer at the top of an atomizing tank through the flow limiting hole, atomizing the molten alloy in the atomizer by high-pressure inert gas of 3-5 MPa into spherical or spheroidal granular alloy powder, and grading by an airflow classifier to obtain D50Is granular alloy powder with the particle size of 3-10 mu m.
Second, sheeting and surface modification
With D50Taking 3-10 mu m granular alloy powder as a raw material, adding a grinding aid and a modification aid, wherein the grinding aid and the modification aid comprise one or more of dispersing agent, stearic acid, stearate, stearic amide, glyceryl stearate, isopropyl palmitate and coupling agent, and can be compounded, the addition amount of the aid is 2 percent of the weight of the alloy powder, and grinding the granular alloy powder into D in a horizontal drum-type ball mill by adopting a dry grinding or wet grinding mode50A flake alloy powder having a thickness of 8 to 15 μm and a thickness of 0.1 to 0.3 μm. The grinding medium balls are stainless steel balls, and the diameter of each grinding medium ball is 2-12 mm.
The wet grinding mode is adopted for processing, the uniformity of the product is better, the coating property of the modifier is better, the solvent oil is used as a wet grinding medium, and the solvent oil can be reused; the oil-to-material ratio is 7: 4. Wet grinding, performing solid-liquid separation by a centrifuge or a filter press to obtain a paste product, drying the paste product and the like to obtain dry powder, and obtaining the sheet alloy powder with the sheet thickness of 0.1-0.3 mu m and the surface coated with the modification additive by the process.
Third, dry powder post-treatment
Quantitatively adding the semi-finished flaky alloy powder into an airflow classifier protected by inert gas for classification, selecting a product with qualified granularity, and quantitatively sealing and packaging.
Wherein the wet grinding method in the second step comprises
(1) And flaked polishing
2m is selected3A horizontal roller ball mill, wherein the outer wall of the ball mill is provided with a jacket, the ground slurry is indirectly cooled by circulating cooling water, and the water temperature of a cooling water inlet is controlled to be 4-8 ℃; selecting a steel ball with the diameter of 5mm as a grinding medium, wherein the ball loading amount is 2.5T; solvent oil is used as grinding fluid, cold welding and oxidation of alloy powder in the grinding process can be prevented, and the addition amount of the solvent is 1000L; the granularity of the raw materials is controlled to be 3-10 mu m, and the adding amount of the raw materials is 400 kg; the addition amount of the auxiliary agent is 2-5% of the amount of the metal; the working frequency of the ball mill is 20-45 Hz; in the grinding process, slurry is always pumped into a heat exchanger filled with cooling water through a slurry pump, the cooled slurry returns to the ball mill, and the slurry circulates in such a way, so that the temperature of the slurry can be effectively reduced, and the uniformity of a product is improved; the milling time was 12 hours.
(2) Filter pressing solid-liquid separation
Pumping the ground slurry into a filter press for filter pressing; the filtrate can be used as grinding fluid for repeated use, and the obtained filter cake is a raw material for preparing a cream product.
(3) Kneading compound paste
Adding the filter cake into a kneader, and preparing a paste product by adding a proper amount of the kneader according to the requirements of users.
(4) Drying to obtain powder
If a powdery product is needed, putting the filter cake obtained in the step (3) into a vacuum drier for drying; the drying temperature is controlled to be between 60 and 200 ℃; and the drying constant temperature time is 6-15 hours.
(5) Shaping of
In order to ensure the flatness of the sheet shape of the product, the product needs to be shaped after grinding; 2m is selected3The polishing machine of (1); selecting a stainless steel ball with the thickness of 3mm as a polishing ball, wherein the addition amount of the polishing ball is 2T; the treatment capacity of the semi-finished product sheet-shaped zinc-aluminum alloy powder is 300 kg; before polishing, vacuumizing and refilling nitrogen to ensure that the nitrogen pressure in the polishing mill is slightly higher than the environmental pressure, and generally controlling the nitrogen pressure to be between 0.01 and 0.03 MPa; the polishing frequency is 20-40 Hz, and the polishing time is 1-4 h.
(3) Grading
Selecting airflow classification and classifying the polished product, wherein the classification adopts nitrogen protection; the graded feeding amount is controlled to be 80 kg; the working frequency of the first-stage grading impeller is 10-30 Hz, and the working frequency of the second-stage grading impeller is 25-40 Hz, so that finished products with various specifications can be obtained.
The zinc-aluminum alloy flake powder of the present invention is composed of Al, Si and trace impurity elements, and some preferred embodiments of the present invention are listed in table 1, but the contents of the components of the present invention are not limited to the specific values listed in tables 1-3, and can be reasonably summarized and deduced by those skilled in the art based on the specific values listed in table 1.
The parameters such as bulk density mentioned in table 2 are not essential technical features for solving the present invention, but are merely better technical solutions obtained by the present invention compared with the prior art. For the invention, the key content lies in the setting of zinc-aluminum alloy flake powder components, particularly the setting of the specific composition of the thickness, the flake diameter and the granularity and the setting of the ratio of the thickness and the diameter to the thickness of the powder flake and the preparation method of the zinc-aluminum flake powder, thereby achieving the aim of the invention suitable for producing the chromium-free zinc-aluminum coating liquid.
On the basis, the technical effect is more prominent and superior through further improvement of the production process. Therefore, the bulk density performance parameters are shown in table 2 below in the specification only for the purpose of more detailed and convenient description of the technical solution of the present invention, and are not described as essential features for solving the technical problems of the present invention.
Similarly, tables 2-3 further illustrate specific chemical compositions, physical characteristics, and levels of specific chemical components of the invention, which are also described as preferred embodiments, and those skilled in the art should be able to ascertain that the technical problems are not necessarily required to be solved using the technical characteristics illustrated in tables 1-3, i.e., they are not described as necessary.
Wherein, fig. 1 is an appearance diagram of the powdery product of the invention, fig. 2 is an appearance diagram of the pasty product, fig. 3 is a scanning electron microscope diagram of the powdery product of the invention, and fig. 4 is a scanning electron microscope diagram of the pasty product of the invention.
The front and back comparison photographs of the workpiece in the salt spray corrosion resistance test in FIG. 5 are specific customer feedback, the model of the workpiece is SIWA-200218B, and the thickness of the dry film before the test is 10.56 μm; the thickness of the dry film after 2880 hours of the salt spray test is still 10.56 mu m and is intact. Meanwhile, data provided by a plurality of users show that the workpieces coated by the zinc-aluminum coating liquid produced by the product have the salt spray corrosion resistance time of more than 1000 hours, and the longest time of the individual workpieces can reach more than 5000 hours.
TABLE 1 common specification raw materials and main technical indexes of Zn-Al alloy flake powder
TABLE 2 product specification and physical index of Zn-Al alloy flake powder
TABLE 3 chemical composition of Zn-Al alloy flakes
Claims (9)
1. The zinc-aluminum alloy flake powder is characterized by comprising the following components in percentage by weight: zn: 70% -97%, Al: 3% -30% of coating agent: 2-4%, wherein the lead and cadmium contents are both less than 50ppm, and the total impurity content is not more than 0.01%.
The average sheet diameter of the zinc-aluminum alloy sheet powder is 5-20 mu m, the sheet thickness is 0.1-0.3 mu m, and the ratio of the diameter to the thickness is 50-200.
2. The zinc-aluminum alloy flake powder according to claim 1, wherein the bulk density of the zinc-aluminum alloy flake powder is from 0.2 to 0.6g/cm3。
3. A method for preparing the zinc-aluminum alloy flake powder of claim 1, comprising the steps of:
(1) preparation of prealloyed superfine powder raw material
Adding a zinc ingot and an aluminum ingot into a smelting furnace according to the proportion of claim 1, smelting into molten alloy, introducing the molten alloy into a preheated tundish with a flow-limiting hole at the bottom, allowing the molten alloy to enter an atomizer at the top of an atomizing tank through the flow-limiting hole, atomizing the molten alloy in the atomizer by high-pressure inert gas of 3-5 MPa into spherical or spheroidal granular alloy powder, and classifying by an airflow classifier to obtain the granular alloy powder with the D50 of 5-20 microns.
(2) Sheeting and surface modification
Taking granular alloy powder with the diameter of 5-20 microns of D50 as a raw material, adding a grinding aid and a modification aid into a grinding machine, grinding the granular alloy powder into sheet alloy powder with the diameter of 0.1-0.3 microns of D50 by a dry grinding or wet grinding method, wherein the sheet alloy powder needs to use solvent oil as a wet grinding medium, the solvent oil can be reused, and a pasty product can be obtained by performing solid-liquid separation by using a centrifuge or a filter press after wet grinding; drying the pasty product to obtain dry powder; through the process, the flaky alloy powder with the sheet thickness of 0.1-0.3 mu m and the surface coated with the modification additive can be obtained.
(3) Dry powder post-treatment
Quantitatively adding the semi-finished flaky alloy powder into an airflow classifier protected by inert gas for classification, selecting a product with qualified granularity, and quantitatively sealing and packaging.
4. The method of claim 3, wherein the oil-to-material ratio in the step (2) is 5-10L: 3-6 kg.
5. The method according to claim 3, wherein the grinding aid and the modification aid comprise one or more of a dispersant, stearic acid, a stearate, stearic acid amide, glyceryl stearate, isopropyl palmitate and a coupling agent.
6. The method according to claim 3, wherein the grinding aid and the modification aid are added in an amount of 1-4 wt% based on the weight of the alloy powder.
7. The method of claim 3, wherein the grinding media balls are zirconia, stainless steel or steel balls made of other materials, and the diameter of the grinding media balls is 2-12 mm.
8. The method of claim 3, wherein the dry milling method in the step (2) is:
(1) flaking grinding
2-6 m is selected3A horizontal roller ball mill, wherein the outer wall of the ball mill is provided with a jacket, the ground slurry is indirectly cooled by circulating cooling water, and the water temperature of a cooling water inlet is controlled to be 4-8 ℃; selecting a steel ball with the diameter of 8-20 mm as a grinding medium, wherein the ball loading amount is 4-10T; the granularity of the raw materials is controlled to be 10-20 mu m, and the adding amount of the raw materials is 500-1000 kg; the addition amount of the auxiliary agent is 2-5% of the amount of the metal; before grinding, vacuumizing and filling nitrogen, and controlling the pressure to be between 0.01 and 0.03 MPa; the working frequency of the ball mill is 15-45 Hz; the grinding time depends on the particle size of the raw material and the product specification and is usually 8-16 hours.
(2) Shaping of
Selecting 1-2 m3The polishing machine selects a stainless steel ball with the thickness of 1-4 mm as a polishing ball, and the addition amount of the polishing ball is 1-3T; the treatment capacity of the flaky zinc-aluminum alloy powder of the semi-finished product is 200-500 kg; before polishing, vacuumizing and refilling nitrogen gas to ensure that the nitrogen gas pressure in the polishing mill is slightly higher than the environmental pressure, and is usually controlled to be 0.01-0.03 MPa; the polishing frequency is 20-40 Hz, and the polishing time is 1-4 h.
(3) Grading
Selecting airflow classification and classifying the polished product, wherein the classification adopts nitrogen protection; the grading feeding amount is controlled to be 60-100 kg; the working frequency of the first-stage grading impeller is 10-30 Hz, and the working frequency of the second-stage grading impeller is 25-40 Hz.
9. The method of claim 4, wherein the wet milling method in step (2) is:
(1) flaking grinding
Selecting 1-2 m3The outer wall of the horizontal roller ball mill is provided with a jacket, the grinding slurry can be indirectly cooled by circulating cooling water, and the water temperature of a cooling water inlet is controlled to be 4-8 ℃ generally; selecting a steel ball with the diameter of 2-8 mm as a grinding medium, wherein the ball loading amount is 1.5-3T; solvent oil is used as grinding fluid, cold welding and oxidation of alloy powder in the grinding process can be prevented, and the addition amount of the solvent oil is 500-1500L; the granularity of the raw materials is controlled to be 3-10 mu m, and the addition amount of the raw materials is 300-500 kg generally; the addition amount of the auxiliary agent is 2-5% of the amount of the metal; the working frequency of the ball mill is 20-45 Hz; and in the grinding process, the slurry is always pumped into a heat exchanger filled with cooling water through a slurry pump, the cooled slurry returns to the ball mill, and the grinding time is usually 8-16 hours.
(2) Filter pressing solid-liquid separation
Pumping the ground slurry into a filter press for filter pressing; the filtrate can be used as grinding fluid for repeated use, and the obtained filter cake is a raw material for preparing a cream product.
(3) Kneading compound paste
Adding the filter cake into a kneader, and preparing a paste product by adding a proper amount of the kneader according to the requirements of users.
(4) Drying to obtain powder
If a powdery product is needed, putting the filter cake obtained in the step (3) into a vacuum drier for drying; the drying temperature is usually controlled to be between 60 and 200 ℃; the drying constant temperature time is usually 6-15 hours;
the dried powder obtained after drying is subjected to the same shaping and grading procedures as the dry grinding method of claim 8 to obtain finished products with various specifications.
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| CN113510244A (en) * | 2021-04-28 | 2021-10-19 | 湖南新威凌金属新材料科技股份有限公司 | Method and device for producing flaky metal pigment |
| CN114316799A (en) * | 2022-01-05 | 2022-04-12 | 深圳市元亨高新科技高分子材料开发有限公司 | Multi-metal aqueous low-film-thickness environment-friendly high-salt-spray antirust material based on surface passivation |
| CN117655343A (en) * | 2024-01-31 | 2024-03-08 | 中铝科学技术研究院有限公司 | Flaky zinc powder, preparation method and application thereof |
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| CN114316799B (en) * | 2022-01-05 | 2022-08-26 | 深圳市元亨高新科技高分子材料开发有限公司 | Multi-metal aqueous low-film-thickness environment-friendly high-salt-spray antirust material based on surface passivation |
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