CN113979755A - Process control method for improving powder apparent density ratio of MnZn ferrite powder - Google Patents
Process control method for improving powder apparent density ratio of MnZn ferrite powder Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 88
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004886 process control Methods 0.000 title claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 28
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000005469 granulation Methods 0.000 claims description 15
- 230000003179 granulation Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000007580 dry-mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000011343 solid material Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 7
- 238000011068 loading method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 5
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 5
- 230000005415 magnetization Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000012856 packing Methods 0.000 abstract description 14
- 239000007787 solid Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 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
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- 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
- C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites
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- 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
- C04B35/62695—Granulation or pelletising
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
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- Soft Magnetic Materials (AREA)
Abstract
The invention relates to the technical field of the loose packing ratio of MnZn ferrite powder, in particular to a process control method for improving the loose packing ratio of the MnZn ferrite powder, which controls the production cost by selecting iron oxide red with the loose packing ratio of 0.45g/cm < 3 > min as a raw material, and controls the solid content of slurry formed after a pre-sintering stage by controlling the temperature of an inlet inside a spray tower, thereby controlling the loose packing ratio of the powder and improving the loose packing ratio of the powder on the premise of not increasing the consumption of a dispersing agent.
Description
Technical Field
The invention relates to the technical field of MnZn ferrite powder loose loading ratio, in particular to a process control method for improving the powder loose loading ratio of MnZn ferrite powder.
Background
The MnZn ferrite magnetic core is an indispensable electronic material and widely used for various communication and electronic equipment, the requirement of powder for manufacturing the MnZn ferrite magnetic core is also improved along with the continuous improvement of the demand of the MnZn ferrite magnetic core, and the loose packing ratio of the powder is an important parameter for measuring the quality of the powder, so the control technology of the loose packing ratio of the powder is developed along with the development of the control technology of the loose packing ratio of the powder.
In the prior art, in order to improve the loose loading ratio of powder, the using amount of a dispersing agent is usually increased, but the increase of the using amount of the dispersing agent has some defects, so that the manufacturing cost is increased, hollow particles (hemispheres) of the powder are easily generated, and the practicability is reduced.
Disclosure of Invention
The invention aims to provide a process control method for improving powder apparent density ratio of MnZn ferrite powder, which aims to solve the problems in the background art that: the prior art increases the loose packing ratio by increasing the dosage of the dispersant, which leads to the rise of the cost and the generation of hollow particles (hemispheres) of powder.
In order to achieve the purpose, the invention provides the following technical scheme: the process control method for improving the powder apparent density ratio of MnZn ferrite powder comprises the steps of carrying out chemical reaction in multiple steps, taking iron oxide red (Fe2O3) as a raw material, and detecting and leaving a factory after the iron oxide red is taken as a dry mixing system, a presintering system, a sanding system and a spray granulation system, wherein the process control method comprises the following steps:
dry mixing: mixing raw material iron oxide red (Fe2O3) and some metal oxides according to a certain proportion, and carrying out vibromilling for 25 minutes by a vibromill;
(II) pre-burning: pre-burning the mixed ferrite in a rotary kiln in an electric heating mode for 4 hours;
and (III) sanding: adding pure water, a binder, a dispersant and a defoaming agent into the pre-sintered material in a sand mill, and finely grinding to convert the material powder into a slurry state;
(IV) spray granulation: firstly, adjusting the actual mixture ratio of the slurry, measuring the mixture ratio of each metal element in the slurry by using an X-fluorescence analyzer, supplementing materials according to the measurement result, and pumping the adjusted slurry into a spray tower by using a pressure pump for granulation;
(V) detection: and fourthly, screening the material powder size by using a vibrating screen at the outlet of the spray tower, pressing the material powder as a finished product material to form a magnetic core or selling the material powder as a finished product material, pre-burning and degumming the undesirable coarse and fine powder, and then re-entering the production process.
Preferably, the iron red (Fe2O3) as the raw material in the first step is selected to have a loose ratio of 0.45g/cm3 min.
Preferably, the degree of magnetization of the pre-sintering process in the second step is 8-14 Am 2/kg.
Preferably, in the third step, the sand is used for grinding the solid material/water/steel ball in a ratio of 400Kg of solid material/230 Kg of water/2T of steel ball.
Preferably, the vortex sheet in the fourth step has three thicknesses of 2.8mm and 1 vortex sheet with 2.0mm, and the aperture of the nozzle is 1.6 mm.
Preferably, the water content of the powder at the tower mouth in the fourth step is controlled to be between 0.15 and 0.20 percent, and the pressure of a material pump is controlled to be between 2.2 and 2.4; the particle distribution of the powder is 80-200 meshes and is more than or equal to 85 percent.
Preferably, in the second step, the pre-sintering is divided into four stages, namely a preheating stage, a temperature raising stage, a sintering stage and a cooling stage.
Preferably, in the fourth step: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 350 ℃.
The invention has the beneficial effects that:
1. according to the invention, the iron oxide red with the loose packing ratio of 0.45g/cm3min is selected as the raw material, so that the preparation of powder with high loose packing ratio is facilitated, the production cost can be controlled better, and the loose packing ratio of the powder can be improved on the premise of not increasing the consumption of the dispersing agent.
2. According to the invention, the solid content of the slurry formed after the pre-burning stage is controlled by controlling the temperature of the inlet in the spray tower, so that the loose packing ratio of the powder is controlled, and the loose packing ratio of the powder is improved on the premise of not increasing the consumption of the dispersing agent.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The process control method for improving the powder apparent density ratio of MnZn ferrite powder comprises the steps of carrying out chemical reaction in multiple steps, taking iron oxide red (Fe2O3) as a raw material, carrying out detection and delivery after a dry mixing system, a pre-sintering system, a sanding system and a spray granulation system are adopted, and is characterized by comprising the following steps:
dry mixing: mixing raw material iron oxide red (Fe2O3) and some metal oxides according to a certain proportion, and carrying out vibromilling for 25 minutes by a vibromill;
(II) pre-burning: pre-burning the mixed ferrite in a rotary kiln in an electric heating mode for 4 hours;
and (III) sanding: adding pure water, a binder, a dispersant and a defoaming agent into the pre-sintered material in a sand mill, and finely grinding to convert the material powder into a slurry state;
(IV) spray granulation: firstly, adjusting the actual mixture ratio of the slurry, measuring the mixture ratio of each metal element in the slurry by using an X-fluorescence analyzer, supplementing materials according to the measurement result, and pumping the adjusted slurry into a spray tower by using a pressure pump for granulation;
(V) detection: and fourthly, screening the material powder size by using a vibrating screen at the outlet of the spray tower, pressing the material powder as a finished product material to form a magnetic core or selling the material powder as a finished product material, pre-burning and degumming the undesirable coarse and fine powder, and then re-entering the production process.
In the first step, the iron red (Fe2O3) as the raw material is selected, wherein the loose loading ratio is 0.45g/cm3 min.
And in the second step, the degree of magnetization of the pre-sintering process is controlled to be between 8 and 14Am 2/kg.
In the third step, the proportion of the solid material/water/steel ball is sand-milled according to the solid material 400 Kg/water 230 Kg/steel ball 2T.
In the fourth step, the vortex sheet has three thicknesses of 2.8mm and 1 vortex sheet with 2.0mm, and the aperture of the nozzle is 1.6 mm.
In the fourth step, the water content of the powder at the tower mouth is controlled between 0.15 and 0.20 percent, and the pressure of a material pump is controlled between 2.2 and 2.4; the particle distribution of the powder is 80-200 meshes and is more than or equal to 85 percent.
In the second step, the pre-sintering is divided into four stages, namely a preheating stage, a temperature rising stage, a sintering stage and a cooling stage.
In the fourth step: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 350 ℃.
Example 2
The process control method for improving the powder apparent density ratio of MnZn ferrite powder comprises the steps of carrying out chemical reaction in multiple steps, taking iron oxide red (Fe2O3) as a raw material, carrying out detection and delivery after a dry mixing system, a pre-sintering system, a sanding system and a spray granulation system are adopted, and is characterized by comprising the following steps:
dry mixing: mixing raw material iron oxide red (Fe2O3) and some metal oxides according to a certain proportion, and carrying out vibromilling for 25 minutes by a vibromill;
(II) pre-burning: pre-burning the mixed ferrite in a rotary kiln in an electric heating mode for 4 hours;
and (III) sanding: adding pure water, a binder, a dispersant and a defoaming agent into the pre-sintered material in a sand mill, and finely grinding to convert the material powder into a slurry state;
(IV) spray granulation: firstly, adjusting the actual mixture ratio of the slurry, measuring the mixture ratio of each metal element in the slurry by using an X-fluorescence analyzer, supplementing materials according to the measurement result, and pumping the adjusted slurry into a spray tower by using a pressure pump for granulation;
(V) detection: and fourthly, screening the material powder size by using a vibrating screen at the outlet of the spray tower, pressing the material powder as a finished product material to form a magnetic core or selling the material powder as a finished product material, pre-burning and degumming the undesirable coarse and fine powder, and then re-entering the production process.
In the first step, the iron red (Fe2O3) as the raw material is selected, wherein the loose loading ratio is 0.45g/cm3 min.
And in the second step, the degree of magnetization of the pre-sintering process is controlled to be between 8 and 14Am 2/kg.
In the third step, the proportion of the solid material/water/steel ball is sand-milled according to the solid material 400 Kg/water 230 Kg/steel ball 2T.
In the fourth step, the vortex sheet has three thicknesses of 2.8mm and 1 vortex sheet with 2.0mm, and the aperture of the nozzle is 1.6 mm.
In the fourth step, the water content of the powder at the tower mouth is controlled between 0.15 and 0.20 percent, and the pressure of a material pump is controlled between 2.2 and 2.4; the particle distribution of the powder is 80-200 meshes and is more than or equal to 85 percent.
In the second step, the pre-sintering is divided into four stages, namely a preheating stage, a temperature rising stage, a sintering stage and a cooling stage.
In the fourth step: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 375 ℃.
Example 3
The process control method for improving the powder apparent density ratio of MnZn ferrite powder comprises the steps of carrying out chemical reaction in multiple steps, taking iron oxide red (Fe2O3) as a raw material, carrying out detection and delivery after a dry mixing system, a pre-sintering system, a sanding system and a spray granulation system are adopted, and is characterized by comprising the following steps:
dry mixing: mixing raw material iron oxide red (Fe2O3) and some metal oxides according to a certain proportion, and carrying out vibromilling for 25 minutes by a vibromill;
(II) pre-burning: pre-burning the mixed ferrite in a rotary kiln in an electric heating mode for 4 hours;
and (III) sanding: adding pure water, a binder, a dispersant and a defoaming agent into the pre-sintered material in a sand mill, and finely grinding to convert the material powder into a slurry state;
(IV) spray granulation: firstly, adjusting the actual mixture ratio of the slurry, measuring the mixture ratio of each metal element in the slurry by using an X-fluorescence analyzer, supplementing materials according to the measurement result, and pumping the adjusted slurry into a spray tower by using a pressure pump for granulation;
(V) detection: and fourthly, screening the material powder size by using a vibrating screen at the outlet of the spray tower, pressing the material powder as a finished product material to form a magnetic core or selling the material powder as a finished product material, pre-burning and degumming the undesirable coarse and fine powder, and then re-entering the production process.
In the first step, the iron red (Fe2O3) as the raw material is selected, wherein the loose loading ratio is 0.45g/cm3 min.
And in the second step, the degree of magnetization of the pre-sintering process is controlled to be between 8 and 14Am 2/kg.
In the third step, the proportion of the solid material/water/steel ball is sand-milled according to the solid material 400 Kg/water 230 Kg/steel ball 2T.
In the fourth step, the vortex sheet has three thicknesses of 2.8mm and 1 vortex sheet with 2.0mm, and the aperture of the nozzle is 1.6 mm.
In the fourth step, the water content of the powder at the tower mouth is controlled between 0.15 and 0.20 percent, and the pressure of a material pump is controlled between 2.2 and 2.4; the particle distribution of the powder is 80-200 meshes and is more than or equal to 85 percent.
In the second step, the pre-sintering is divided into four stages, namely a preheating stage, a temperature rising stage, a sintering stage and a cooling stage.
In the fourth step: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 400 ℃.
Control group: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 300 ℃.
The results are given in the following table:
| inlet temperature (. degree.C.) | Slurry solid content (%) | Bulk specific gravity of powder | |
| Control group | 325 | 61 | 1.47 |
| Example one | 350 | 62 | 1.48 |
| Example two | 375 | 63 | 1.49 |
| EXAMPLE III | 400 | 64 | 1.50 |
According to the table, the process control method for improving the powder apparent density ratio of the MnZn ferrite powder disclosed by the invention is realized through production practices, and the powder apparent density ratio is stabilized to be 1.47-1.50.
Claims (8)
- The process control method for improving the powder apparent density ratio of MnZn ferrite powder comprises the following steps of carrying out chemical reaction in multiple steps, taking iron oxide red (Fe2O3) as a raw material, carrying out detection and delivery after a dry mixing system, a pre-sintering system, a sanding system and a spray granulation system are adopted, and is characterized by comprising the following steps of:dry mixing: mixing raw material iron oxide red (Fe2O3) and some metal oxides according to a certain proportion, and carrying out vibromilling for 25 minutes by a vibromill;(II) pre-burning: pre-burning the mixed ferrite in a rotary kiln in an electric heating mode for 4 hours;and (III) sanding: adding pure water, a binder, a dispersant and a defoaming agent into the pre-sintered material in a sand mill, and finely grinding to convert the material powder into a slurry state;(IV) spray granulation: firstly, adjusting the actual mixture ratio of the slurry, measuring the mixture ratio of each metal element in the slurry by using an X-fluorescence analyzer, supplementing materials according to the measurement result, and pumping the adjusted slurry into a spray tower by using a pressure pump for granulation;(V) detection: and fourthly, screening the material powder size by using a vibrating screen at the outlet of the spray tower, pressing the material powder as a finished product material to form a magnetic core or selling the material powder as a finished product material, pre-burning and degumming the undesirable coarse and fine powder, and then re-entering the production process.
- 2. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the first step, the iron red (Fe2O3) as the raw material is selected to have a loose loading ratio of 0.45g/cm3 min.
- 3. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: and in the second step, the degree of magnetization of the pre-sintering process is controlled to be 8-14 Am 2/kg.
- 4. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the third step, the sand is used for grinding the solid material/water/steel ball according to the solid material ratio of 400 Kg/water 230 Kg/steel ball 2T.
- 5. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the fourth step, the vortex sheet has three thicknesses of 2.8mm and 1 vortex sheet with 2.0mm, and the aperture of the nozzle is 1.6 mm.
- 6. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the fourth step, the water content of the powder at the tower mouth is controlled to be 0.15-0.20%, and the pressure of a material pump is controlled to be 2.2-2.4; the particle distribution of the powder is 80-200 meshes and is more than or equal to 85 percent.
- 7. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the second step, the pre-sintering is divided into four stages, namely a preheating stage, a temperature rising stage, a sintering stage and a cooling stage.
- 8. The process control method for improving powder apparent density ratio of MnZn ferrite powder of claim 1, which is characterized in that: in the fourth step: the outlet temperature of the spray tower is controlled to be 150 ℃, and the inlet temperature is controlled to be 350 ℃.
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