CN112694337A - Method for controlling formability characteristic of permanent magnetic ferrite material slurry - Google Patents
Method for controlling formability characteristic of permanent magnetic ferrite material slurry Download PDFInfo
- Publication number
- CN112694337A CN112694337A CN202011435157.9A CN202011435157A CN112694337A CN 112694337 A CN112694337 A CN 112694337A CN 202011435157 A CN202011435157 A CN 202011435157A CN 112694337 A CN112694337 A CN 112694337A
- Authority
- CN
- China
- Prior art keywords
- slurry
- temperature
- value
- proportion
- ball mill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 79
- 239000000463 material Substances 0.000 title claims abstract description 68
- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 36
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- 239000006247 magnetic powder Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 8
- 230000008025 crystallization Effects 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims description 3
- 229910000018 strontium carbonate Inorganic materials 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 7
- 239000010959 steel Substances 0.000 claims 7
- 230000018044 dehydration Effects 0.000 claims 2
- 238000006297 dehydration reaction Methods 0.000 claims 2
- 239000012535 impurity Substances 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 229910000617 Mangalloy Inorganic materials 0.000 claims 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 239000011805 ball Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 claims 1
- 235000019219 chocolate Nutrition 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 239000011572 manganese Substances 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 230000000007 visual effect Effects 0.000 claims 1
- 229910052712 strontium Inorganic materials 0.000 abstract description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000001238 wet grinding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013068 supply chain management Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2683—Other ferrites containing alkaline earth metals or lead
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
- C04B35/62615—High energy or reactive ball milling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/442—Carbonates
Abstract
The invention relates to a permanent magnetic ferrite material slurry formability characteristic control method, which comprises the following steps: the first step is as follows: analyzing the pH value of the material; the second step is that: calibrating the primary sintering temperature; the third step: a method for reducing sticky substances; the fourth step: the proportion of the soft components is reduced; the fifth step: adding a regulating material; and a sixth step: grinding by a ball mill; the seventh step: slurry precipitation and filter cloth filtration; eighth step: and (5) wet pressing and forming the magnetic tile green body. The invention is based on the application of a control method for carrying out fine adjustment and targeted optimization of material proportion on the basis of a theoretical model of a strontium ferrite hexagonal crystal system mechanism, has simple process, does not need to add new process equipment, improves the forming speed of the slurry of the permanent magnetic ferrite material, and improves the production efficiency and the yield of customers who use the pre-sintered material powder.
Description
Technical Field
The invention relates to a production process of a permanent magnetic ferrite magnetic piece, in particular to a method for controlling the formability characteristic of slurry of a permanent magnetic ferrite material, belonging to the technical field of production processes of permanent magnetic ferrite magnetic pieces.
Background
The production process of the ferrite magnetic part comprises the following steps: ferrite magnetic powder, secondary proportioning, wet grinding, molding, secondary sintering, grinding and loading; at present, the permanent magnetic ferrite material is produced basically according to the process flow when being produced by a magnetic shoe manufacturer, wherein the efficiency of the forming process is an important relevant process of the production efficiency of the magnetic shoe manufacturer.
In order to increase the forming operation speed and yield of the process, magnetic shoe manufacturers continuously improve and innovate the raw material supply chain management, the forming feeding equipment technology, the slurry preparation and water content control, and the formed blank taking and stacking technology and equipment. In order to improve the productivity, equipment and technology such as automatic grouting, automatic molding and the like are continuously improved.
Factors influencing the forming efficiency of the magnetic part include the proportion of magnetic powder production, the reasonability of the temperature of primary magnetic powder sintering, oxygen content fluctuation of sintering atmosphere, the variety and quantity of additives of secondary batching, the fineness of wet grinding, the moisture content of wet grinding slurry and the like, the radian, thickness, area and the like of a wet-pressed formed product, the tonnage of a forming press, the material of a die, the path and mode of water absorption, the automatic grouting efficiency and compactness, the efficiency and softness of automatic blank taking and the like.
The viscosity, fineness and hardness of the secondary slurry, the material of the die, and the path and mode of water absorption are all common factors hindering the forming efficiency by improving the hardness of the material, including optimizing the primary temperature and the proportion of soft miscellaneous items in the magnetic powder. .
The invention aims to provide a pressability control method for wet-grinding slurry of a permanent magnet material, which mainly solves the problems that the existing ferrite magnetic powder has high soft miscellaneous item proportion, the temperature control standard is difficult to unify, and the forming efficiency of secondary slurry of a magnetic shoe is low due to temperature fluctuation in raw materials.
Disclosure of Invention
The invention provides a method for controlling the formability characteristic of permanent magnetic ferrite material slurry aiming at the problems in the prior art, and the technical scheme mainly solves the problem that the forming speed of a magnetic shoe is low due to poor controllability of the wet-pressing forming viscosity of the existing strontium ferrite secondary slurry. The invention is based on the application of a control method for carrying out fine adjustment and targeted optimization of material proportion on the basis of a theoretical model of a strontium ferrite hexagonal crystal system mechanism, has simple process, does not need to add new process equipment, improves the forming speed of the slurry of the permanent magnetic ferrite material, and improves the production efficiency and the yield of customers who use the pre-sintered material powder.
In order to achieve the above object, the technical solution of the present invention is a method for controlling formability characteristics of permanent ferrite material slurry, the method comprising the steps of:
the first step is as follows: analyzing the pH value of the material;
250g of coarse powder is taken, sieved by a 120-mesh sample sieve in a natural state, and screen residues are removed. If the sieve residue contains more than 3 percent of particles with the particle size of more than 2mm, a 100-mesh screen is required to be arranged at the outlet of the wet ball mill to ensure that the particles in the slurry are filtered. 100g of the powder was taken and 200mL of tap water or distilled water was added. Heating to 150g by using an electric heating plate or an electric furnace or other rapid heating equipment, and detecting the pH value accurately by using a standard pH meter when the temperature of the slurry is reduced to 50-80 ℃. And when the conditions are insufficient, B-wide test paper can be adopted for detection. And adjusting according to the comparison of the detection value and the range in the lower table. The pH measurement can usually be carried out within 30 minutes, while the measurement of the magnetic properties usually takes 48 to 72 hours. The method has good sensitivity and greatly improved efficiency,
the second step is that: calibrating the primary sintering temperature;
the coarse powder production temperature process is adjusted for a magnetic powder supplier with lower forming efficiency, and the adjusting method comprises the following steps:
continuously raising the temperature at the existing temperature, wherein the temperature amplitude is 5 ℃ every time, and observing the section crystallization sampling detection performance and the forming efficiency of the coarse powder particles after the temperature is raised. And guiding the forming efficiency to reach the target requirement. The highest amplitude is that when the temperature reaches a certain temperature, the crystallization suddenly increases. The temperature was then lowered by 10 ℃ as the continuous process temperature. In the actual production process, different temperature measuring instruments, different climatic conditions, different seasons, different induced air and different rotary kiln diameters can cause the absolute value of the temperature measurement of the rotary kiln to deviate. The method is used for determining the optimal temperature, and the deviation of the control reference caused by differences of instruments, links and equipment is avoided.
The third step: a method for reducing sticky substances;
adding the fine grinding iron scale with the granularity of less than or equal to 6 microns according to the pH value detected in the first step, wherein the specific addition amount is as follows:
| pH value | Addition amount of finely ground iron scale (kg/ton) |
| 11-13 | 9-15 |
| 10-11 | 4-9 |
| ≤9 | 0 |
When the pH value is less than or equal to 9, the material of the magnetic powder is not the main reason of low molding efficiency, and more improvement schemes should be found from the molding process.
The fourth step: the proportion of the soft components is reduced;
according to the pH value detected in the first step, calcium carbonate or strontium carbonate with the granularity less than or equal to 3 microns is added, and the specific addition amount is as follows:
| pH value | Carbonate addition (kg/t) |
| ≤6.5 | 1-2 |
| 6.5-9 | 0.5-1 |
| ≥9 | 0 |
When the pH value is greater than or equal to 9, the material of the magnetic powder is not the main reason of low molding efficiency, and an improvement scheme should be found from the molding process.
The fifth step: adding a regulating material; after the wet ball milling and grinding process is finished, sampling from an outlet of the ball mill to detect the viscosity of the product. The twisting and squeezing is carried out by hand, and if there is a significant stickiness, the conditioning material is added as appropriate. When the adhesive is extruded by hand twisting, the texture can be quickly judged, and the production process needs to be adjusted, so that the method is more convenient and easier to popularize than using instruments.
The adjusting materials are as follows: the magnetic shoe grinding material can be a material produced in a grinding process or a grinding recovery material purchased from a professional high-performance magnetic shoe magnetic part manufacturer from the same type of products in the factory. The addition proportion is 10-30% in the secondary burdening process. And (4) finding a balance proportion according to the change of the cost and the actual forming efficiency.
Compared with the prior art, the method has the advantages that 1) the technical scheme is based on the strontium ferrite hexagonal crystal system mechanism theoretical model, the material proportion is optimized in a targeted manner through fine adjustment, the control method is applied, the whole process is simple, no new process equipment is required, and no additional quality risk and cost pressure exist; 2) the invention discloses a control technology of pressability of permanent magnetic ferrite material slurry, which mainly solves the problem that the forming speed of a magnetic shoe is low due to poor viscosity controllability of the existing wet-pressing forming of strontium ferrite secondary slurry; 3) the invention improves the forming speed of the permanent magnetic ferrite material slurry and improves the production efficiency of the use client of the pre-sintering material powder; 4) as the viscosity of the slurry is reduced, water absorption is smoother in the forming process of the magnetic tile green body, the stress inside the green body is uniformly distributed, the proportion of mechanical cracks is reduced in the sintering process, and the yield of products is obviously improved.
The specific implementation mode is as follows:
in order to enhance the understanding of the present invention, the following detailed description of the present invention is given with reference to examples.
Example 1: a permanent magnetic ferrite material slurry formability characteristic control method comprises the following steps:
the first step is as follows: analyzing the pH value of the material;
250g of coarse powder is taken, sieved by a 120-mesh sample sieve in a natural state, and screen residues are removed. If the sieve residue contains more than 3 percent of particles with the particle size of more than 2mm, a 100-mesh screen is required to be arranged at the outlet of the wet ball mill to ensure that the particles in the slurry are filtered. 100g of the powder was taken and 200mL of tap water or distilled water was added. Heating to 150g by using an electric heating plate or an electric furnace or other rapid heating equipment, and detecting the pH value accurately by using a standard pH meter when the temperature of the slurry is reduced to 50-80 ℃. And when the conditions are insufficient, B-wide test paper can be adopted for detection. And adjusting according to the comparison of the detection value and the range in the lower table. The pH measurement can usually be carried out within 30 minutes, while the measurement of the magnetic properties usually takes 48 to 72 hours. The method has good sensitivity and greatly improved efficiency,
the second step is that: calibrating the primary sintering temperature;
the coarse powder production temperature process is adjusted for a magnetic powder supplier with lower forming efficiency, and the adjusting method comprises the following steps:
continuously raising the temperature at the existing temperature, wherein the temperature amplitude is 5 ℃ every time, and observing the section crystallization sampling detection performance and the forming efficiency of the coarse powder particles after the temperature is raised. And guiding the forming efficiency to reach the target requirement. The highest amplitude is that when the temperature reaches a certain temperature, the crystallization suddenly increases. The temperature was then lowered by 10 ℃ as the continuous process temperature. In the actual production process, different temperature measuring instruments, different climatic conditions, different seasons, different induced air and different rotary kiln diameters can cause the absolute value of the temperature measurement of the rotary kiln to deviate. The method is used for determining the optimal temperature, and the deviation of the control reference caused by differences of instruments, links and equipment is avoided.
The third step: a method for reducing sticky substances;
adding the fine grinding iron scale with the granularity of less than or equal to 6 microns according to the pH value detected in the first step, wherein the specific addition amount is as follows:
| pH value | Addition amount of finely ground iron scale (kg/ton) |
| 11-13 | 9-15 |
| 10-11 | 4-9 |
| ≤9 | 0 |
When the pH value is less than or equal to 9, the material of the magnetic powder is not the main reason of low molding efficiency, and more improvement schemes should be found from the molding process.
The fourth step: the proportion of the soft components is reduced;
according to the pH value detected in the first step, calcium carbonate or strontium carbonate with the granularity less than or equal to 3 microns is added, and the specific addition amount is as follows:
| pH value | Carbonate addition (kg/t) |
| ≤6.5 | 1-2 |
| 6.5-9 | 0.5-1 |
| ≥9 | 0 |
When the pH value is greater than or equal to 9, the material of the magnetic powder is not the main reason of low molding efficiency, and an improvement scheme should be found from the molding process.
The fifth step: adding a regulating material; after the wet ball milling and grinding process is finished, sampling from an outlet of the ball mill to detect the viscosity of the product. The twisting and squeezing is carried out by hand, and if there is a significant stickiness, the conditioning material is added as appropriate. When the adhesive is extruded by hand twisting, the texture can be quickly judged, and the production process needs to be adjusted, so that the method is more convenient and easier to popularize than using instruments.
The adjusting materials are as follows: the magnetic shoe grinding material can be a material produced in a grinding process or a grinding recovery material purchased from a professional high-performance magnetic shoe magnetic part manufacturer from the same type of products in the factory. The addition proportion is 10-30% in the secondary burdening process. And (4) finding a balance proportion according to the change of the cost and the actual forming efficiency.
And a sixth step: grinding by a ball mill;
the seventh step: slurry precipitation and filter cloth filtration;
eighth step: and (5) wet pressing and forming the magnetic tile green body.
By applying the method of example 1 to the present example,
the permanent magnetic ferrite material prepared by the method comprises the following steps:
the method is implemented on the basis of a dry-method iron scale process according to the following steps:
the first step is as follows: and analyzing the pH value of the material to obtain that the pH value of the material is 11.
The second step is that: calibrating the primary sintering temperature: the original sintering temperature infrared temperature measurement system has a set value of 1250 ℃, and the method is adopted to try step by step, and when the temperature reaches 1275 ℃, the material crystallization mutation occurs. The temperature was controlled from 1275-10 ℃ to 1265 ℃.
The third step: the addition amount of the fine-milled iron powder was set to 9 kg/t.
The fourth step: according to the table, no carbonate needs to be added.
The actual production verifies that the magnetic performance of the product completely falls within the range of the original magnetic performance mark, and meanwhile, slurry with the granularity of 0.8-1.1um is formed in the secondary wet-pressing ball milling process, and the forming speed is reduced from 14.8 seconds to 11 seconds.
In application example 2, the technique is applied to a wet process iron oxide red permanent magnetic ferrite production line,
the technology is adopted on the basis of a wet iron oxide red material process, and is implemented according to the following steps:
the first step is as follows: and analyzing the pH value of the material to obtain the pH value of the material to be 10.
The second step is that: calibrating the primary sintering temperature: the set value of the original sintering temperature infrared temperature measurement system is 1285 ℃, the method is adopted to try step by step, and when the temperature reaches 1300 ℃, the material crystallization mutation occurs. The controlled temperature of 1290 ℃ is obtained from 1300-10 ℃.
The third step: the addition amount of the fine-milled iron powder was set to 4.5 kg/t.
The fourth step: according to the table, no carbonate needs to be added.
The fifth step: grinding material is added into the mixture, and the adding amount is 15%.
The magnetic property grade of the obtained material is in the original magnetic property range, and the forming speed of 0.65-0.75um slurry formed in the secondary wet pressing process is reduced from 16.2 seconds to 13.8 seconds.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (6)
1. A permanent magnetic ferrite material slurry formability characteristic control method is characterized by comprising the following steps:
the first step is as follows: analyzing the pH value of the material;
the second step is that: calibrating the primary sintering temperature;
the third step: a method for reducing sticky substances;
the fourth step: the proportion of the soft components is reduced;
the fifth step: adding a regulating material;
and a sixth step: grinding by a ball mill;
the ball milling mode can be a roller ball mill, and the ball milling media are bearing steel balls and casting steel balls. The ball diameter of the steel ball is 5mm, 6mm, 8mm and 10mm, and the proportion is 2: 3: 4: 1. the ratio of the material powder to the steel ball is 1: n (n is 6-10, adjusted according to different equipment and products). Wherein the lining plate of the ball mill is made of high manganese steel, and the manganese content is 10-15%. The percentage content of chromium element is less than or equal to 3 percent. The Rockwell hardness of the steel ball is more than or equal to 58 and less than or equal to 65. The crushing load of the steel ball reaches 12000-40000 newton.
The seventh step: filtering and dehydrating the slurry;
the granularity of the slurry after ball milling is in the range of 0.70-1.1um, the slurry needs to be filtered by more than two filtering procedures after coming out of the ball mill, and the first filtering procedure is a mesh filter to filter broken steel balls, impurities, particles and the like with the diameter of more than 1mm in the ball milling. The second filtering step is filtering with a filter screen, and the particles and impurities in the slurry transportation process are filtered through the screen with 80-100 mesh openings.
The slurry dehydration can adopt two modes, namely a mode of naturally filtering water by using filter cloth to reduce the water content of the slurry from 50-60% to 30-40%, or a centrifugal dehydrator is used for dehydration to reduce the water content from 50-60% to 30-35%.
Eighth step: and wet pressing the magnetic tile green body to form.
The formed slurry is conveyed to a forming platform of a press manually or mechanically, and is formed under the forming pressure of 11.5-13.5 MPa by manual feeding and leveling. The forming process needs to add a magnetic field, and the magnetic field needs to be more than 600 kA/m. Meanwhile, the negative pressure of the drainage in the forming process is more than-0.9 MPa. The compression resistance of the formed green body needs to reach more than 28 MPa.
2. The permanent magnetic ferrite material slurry formability characteristic control method according to claim 1, characterized by comprising, in the first step: the pH value of the material is analyzed, and the method specifically comprises the following steps:
taking 250g of coarse powder, sieving the coarse powder in a natural state by using a 120-mesh sample sieve to remove screen residue, and if more than or equal to 3 percent of particles with the particle size of more than or equal to 0.5mm exist in the screen residue, installing a screen with the mesh number of more than 100 meshes at an outlet of the wet ball mill to ensure that the particles in the slurry are completely filtered;
100-500g of powder is taken, 200-1000mL of tap water or distilled water is added, an electric heating plate or an electric furnace or other rapid heating equipment is adopted to heat the weight to 150-750 g, when the temperature of the slurry is reduced to the range of 50-80 ℃, a standard pH meter is adopted to carry out accurate pH value detection, and B-wide test paper is adopted to carry out detection when the conditions are insufficient.
3. The permanent ferrite material slurry formability characteristic control method according to claim 2, characterized in that the second step: the primary sintering temperature is revised as follows:
the secondary wet pressing forming efficiency is low, the particle size of slurry is sticky, or the surface of slurry cleaning liquid is white and sticky to form a chocolate sheet shape, the supplier of the magnetic powder adopted by the magnetic tile production carries out coarse powder production temperature process adjustment, and the adjustment method comprises the following steps:
continuously raising the temperature at the existing temperature, wherein the temperature amplitude is 5 ℃ every time, the section crystallization sampling detection performance and the forming efficiency of the coarse powder particles are observed after the temperature is raised, the forming efficiency is guided to reach the target requirement, the highest raising amplitude is that after the temperature reaches the critical temperature T0, the crystallization is suddenly increased and is more than one time larger than that before the temperature is raised, the sudden increase is caused by that the crystal grains grow along with the rise of the sintering temperature of the material, and the range of T0 is 1230-1320 ℃. When the crystal grains are increased to a critical value, the crystal grains are adhered together, and the characteristic that the crystal grains are connected into a piece and the size of the crystal grains is mutated is shown by visual observation under the strong light of the light emitting diode. At this time, the mechanism of the material is not a perfect hexagonal structure, and the temperature is lowered by 10 ℃ as a stable optimal process temperature.
4. The permanent ferrite material slurry formability characteristic control method according to claim 3, characterized in that the third step: the method for reducing the sticky substances comprises the following specific steps:
adding the fine grinding iron scale with the granularity of less than or equal to 6 microns according to the pH value detected in the first step, wherein the specific addition amount is as follows:
5. The permanent magnetic ferrite material slurry formability characteristic control method according to claim 3 or 4, characterized by the fourth step of: the proportion of the soft components is reduced as follows:
according to the pH value detected in the first step, calcium carbonate or strontium carbonate with the granularity less than or equal to 3 microns is added, and the specific addition amount is as follows:
6. The permanent magnetic ferrite material slurry formability characteristic control method according to claim 5, characterized in that the fifth step: the specific addition of the adjusting materials is as follows: after the wet ball milling and grinding process is finished, sampling from an outlet of a ball mill to detect the viscosity of the ball mill, twisting and extruding by hands, and if the ball mill has obvious viscosity, adding an adjusting material according to the condition, wherein the adjusting material is divided into: grinding magnetic shoe into fine material, adding in the secondary burdening process, the adding proportion is 10-30%. And (4) finding a balance proportion according to the change of the cost and the actual forming efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435157.9A CN112694337A (en) | 2020-12-09 | 2020-12-09 | Method for controlling formability characteristic of permanent magnetic ferrite material slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435157.9A CN112694337A (en) | 2020-12-09 | 2020-12-09 | Method for controlling formability characteristic of permanent magnetic ferrite material slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112694337A true CN112694337A (en) | 2021-04-23 |
Family
ID=75505808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011435157.9A Pending CN112694337A (en) | 2020-12-09 | 2020-12-09 | Method for controlling formability characteristic of permanent magnetic ferrite material slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112694337A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5538657A (en) * | 1993-08-12 | 1996-07-23 | Hitachi Metals, Ltd. | Method of producing ferrite magnet |
| US20060145118A1 (en) * | 2004-12-24 | 2006-07-06 | Hengdian Group Dmegc Magnetics Co., Ltd | Sintered magnet and method for production thereof |
| CN104609843A (en) * | 2014-12-11 | 2015-05-13 | 南京梅山冶金发展有限公司 | Preparation method for non-rare-earth high-remanent-magnetism permanent-magnetism ferrite |
| CN107445605A (en) * | 2017-08-23 | 2017-12-08 | 横店集团东磁股份有限公司 | A kind of preparation method of high-performance permanent magnetic ferrite material |
| CN109111219A (en) * | 2017-06-26 | 2019-01-01 | 上海梅山钢铁股份有限公司 | A kind of preparation method of permanent-magnet ferrite material |
| CN110937887A (en) * | 2019-12-13 | 2020-03-31 | 横店集团东磁股份有限公司 | High-frequency low-loss MnZn ferrite material and preparation method thereof |
-
2020
- 2020-12-09 CN CN202011435157.9A patent/CN112694337A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5538657A (en) * | 1993-08-12 | 1996-07-23 | Hitachi Metals, Ltd. | Method of producing ferrite magnet |
| US20060145118A1 (en) * | 2004-12-24 | 2006-07-06 | Hengdian Group Dmegc Magnetics Co., Ltd | Sintered magnet and method for production thereof |
| CN104609843A (en) * | 2014-12-11 | 2015-05-13 | 南京梅山冶金发展有限公司 | Preparation method for non-rare-earth high-remanent-magnetism permanent-magnetism ferrite |
| CN109111219A (en) * | 2017-06-26 | 2019-01-01 | 上海梅山钢铁股份有限公司 | A kind of preparation method of permanent-magnet ferrite material |
| CN107445605A (en) * | 2017-08-23 | 2017-12-08 | 横店集团东磁股份有限公司 | A kind of preparation method of high-performance permanent magnetic ferrite material |
| CN110937887A (en) * | 2019-12-13 | 2020-03-31 | 横店集团东磁股份有限公司 | High-frequency low-loss MnZn ferrite material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张有纲等: "《磁性材料》", 31 October 1988, 成都：成都电讯工程学院出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105541316B (en) | A kind of anti-EMI filter MnZn ferrite material and preparation method thereof | |
| CN108129143B (en) | High-superposition-characteristic wide-temperature low-power-consumption manganese-zinc soft magnetic ferrite and preparation method thereof | |
| CN111517775B (en) | Heat-shock-resistant NiZn ferrite material and preparation method thereof | |
| CN110156449A (en) | A kind of high reliability Ferrite Material and preparation method thereof | |
| CN102241491A (en) | Fireproof artificial quartz stone and production process thereof | |
| CN112694337A (en) | Method for controlling formability characteristic of permanent magnetic ferrite material slurry | |
| CN106964271B (en) | Iron ore-containing powder composite batching system and method | |
| CN115894004B (en) | Preparation method of strontium ferrite magnetic powder and injection magnetic powder containing strontium ferrite magnetic powder | |
| CN112024109A (en) | Titanium dioxide particle size distribution control method | |
| CN114438313B (en) | Sintering material and material mixing method thereof | |
| CN103484663B (en) | Method for measuring adhesion coefficient of sintering grate | |
| CN113690007B (en) | Rolled permanent magnetic ferrite magnetic powder and rubber product thereof | |
| CN113555073B (en) | Comprehensive evaluation method for coke quality of blast furnace | |
| CN109855988A (en) | A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim | |
| CN110639684B (en) | Coordinated optimization control method of semi-final cement grinding system | |
| CN114920545A (en) | Plate-shaped corundum and production method thereof | |
| CN107651954A (en) | The processing method of permanent ferrite prefiring material | |
| CN108821623A (en) | A kind of analysis method using sand fineness measurement sand quality | |
| SU1389847A1 (en) | Method of controlling the process of grinding materials in the mill | |
| CN108950190A (en) | A kind of iron ore mixing powder dropping sheet, synergy using reduced iron powder | |
| Piffer et al. | Measures to prevent baked anode density drop when using high porosity cokes | |
| EP2829619A1 (en) | Method for adjusting precursor powder for sintering, and precursor powder for sintering | |
| JP7260786B2 (en) | Method for blending raw materials for sintering and method for producing sintered ore | |
| WO2018142331A1 (en) | System and method for maintaining optimum moisture content in granulated mix | |
| CN113816744B (en) | Method for determining adjustment direction and addition proportion of graphite electrode coal tar pitch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210423 |