CN104148159A - Method for controlling primary powder apparent density accurately by utilizing ball mill - Google Patents
Method for controlling primary powder apparent density accurately by utilizing ball mill Download PDFInfo
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- CN104148159A CN104148159A CN201410376099.5A CN201410376099A CN104148159A CN 104148159 A CN104148159 A CN 104148159A CN 201410376099 A CN201410376099 A CN 201410376099A CN 104148159 A CN104148159 A CN 104148159A
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Abstract
The invention discloses a method for controlling the primary powder apparent density accurately by utilizing a ball mill. The method comprises the following steps: (1) feeding, namely, carrying out flushing, crush breaking, hammer breaking or jaw breaking on qualified sponge iron, lifting powder with the particle size being 10-15mm to a ball milling front stock bin, conveying the powder into the ball mill by a vibration feeder, and grinding; (2) carrying out parameter control, namely adjusting the current of the vibration feeder arranged at the feeding end of the ball mill so as to control the feeding quantity, adjusting the current of the ball mill so as to control the rotation speed of the ball mill, thus controlling the grinding speed, adjusting dedusting air suction capacity so as to control the fine powder feeding quantity; (3) discharging through three parts; and (4) screening, namely after screen underflow conforming to the granularity need enters a magnetic separator at the lower part of a drum screen, carrying out magnetic separation, lifting the screen underflow to a storage bin, conveying oversized products not conforming to the granularity need to the ball milling front material feedback storage bin by a material returning belt, adding the oversized products into the ball mill quantitatively according the need of primary powder ingredients, and grinding. According to the method, the apparent density and the particle constitution can be effectively controlled, the production cost is lowered, and the yield is increased.
Description
Technical field
The present invention relates to a kind of method of utilizing ball mill accurately to control a powder apparent density.
Background technology
Powder metallurgy is emerging high-tech industry of China's nineteen sixties, belongs to the high-tech project of country's 12 encourage growths, enters after 21st century, and powder industry develops rapidly, technical merit improves constantly.The current broken sponge iron of China is produced a powder and is generally adopted vibrating mill milling process, yield poorly, noise is high, environment is severe, and the process performance index such as apparent density are difficult to accurate adjustment control, along with improving constantly of numerous goods producer technical merit, product structure, the process performance index such as apparent density are required more and more strict, the technique that adopts vibrating mill abrasive dust to produce a powder seriously restricts the development of iron-based powder industry.Therefore, research substitutes vibrating mill abrasive dust and produces the new technology of a powder, realizes the precision control of the process performance index such as apparent density, and increasing work efficiency, reducing production costs has become powder metallurgy powder process industry and need badly the problem of solution.
Summary of the invention
The object of the invention is for overcoming the deficiency that existing vibrating mill yields poorly, cost is high, a kind of method of utilizing ball mill accurately to control a powder apparent density is provided, can effectively control apparent density and particle composition, reduce production costs, improve output.
For achieving the above object, the present invention adopts following technical proposals:
Utilize ball mill accurately to control a method for a powder apparent density, comprising:
1) charging: qualified sponge iron through clean with water, rack, hammer into shape broken or Hubei Province broken after, the powder of particle diameter 10～15mm is promoted to feed bin before ball milling, sends into ball mill grinding by oscillating feeder, oscillating feeder electric current adjustable range is 0～30A;
2) parameter control: adjust the oscillating feeder electric current that is arranged at feeding of ball mill end realize inlet amount control, adjust ball mill Current Control drum's speed of rotation change realize grinding rate adjustment, (dedusting suction air volume is by Hand-operated butterfly valve control to adjust dedusting suction air volume size, aperture 0～90o) realize the adjustment of the fine powder amount of allocating into, by aforementioned three organic cooperations of technological parameter, reach apparent density index parameter at 2.0～3.0 g/cm
3the object that scope is accurately controlled;
When daily production, the control of apparent density index parameter mainly divides following three kinds:
(1) produce 2.6～3.0 g/cm
3powder of high apparent density: ball mill Current Control is 83%～87% of rated current, and oscillating feeder Current Control is at 12A～15A, and dedusting air quantity butterfly valve opening is controlled at 42o～47o, regulated through 2～3 hours, and one time powder pine dress can be adjusted to 2.6 g/cm
3above.
(2) produce 2.3～2.6 g/cm
3powder of middle apparent density: ball mill Current Control is 68%～81% of rated current, oscillating feeder Current Control is at 7A～10A, dedusting air quantity butterfly valve opening is controlled at 47o～60o, regulates through 2～3 hours, and one time powder pine dress can be adjusted to 2.35～2.55g/cm
3.
3) produce 2.0～2.3 g/cm
3powder of low-apparent-density: ball mill Current Control is 60%～64% of rated current, oscillating feeder Current Control is at 4A～6A, dedusting air quantity butterfly valve opening is controlled at 60o～70o, regulates through 2～3 hours, and one time powder pine dress can be adjusted to 2.1～2.25 g/cm
3.
4) discharging: discharging is divided into three parts: the bulky grain powder of granularity > 5mm is screened out by the monitoring that is arranged at grinding machine discharging opening, granularity is that the powder of 5mm～150 μ m directly enters elevator, the powder of granularity < 150 μ m sinks and collects at cyclone separator after powder being extracted out by the dust arrester that is arranged at grinding machine discharging opening, the powder of the utmost point of granularity < 45 μ m is evacuated to deduster, then the powder of described granularity < 150 μ m is discharged through cyclone dust collectors discharging opening and is promoted to rotary screen by elevator together with the powder that is 5mm～150 μ m with described granularity and screens,
5) screening: the screenings that meets granularity requirements is promoted to storage silo after entering the magnetic separator magnetic separation that is arranged at rotary screen bottom, do not meet oversize feed back warehouse before feed back belt is delivered to ball milling of granularity requirements, need to quantitatively add ball mill to carry out grinding operation according to a meal component.
Process monitoring: often detect described magnetic separator discharging opening material powder apparent density, contrast with technological requirement, adjust in time while there is deviation, a powder apparent density is consistent in batches in realization.
The invention has the beneficial effects as follows:
Compared with the technique of producing a powder with current employing vibrating mill abrasive dust, because milling apparatus no longer adopts the vibrating mill yielding poorly, but adopt output high, keep in repair ball mill easily, so, reduced production cost; Owing to having adopted oscillating feeder at feeding of ball mill end, so changed the inlet amount large difficult problem that fluctuates, make ball mill input and output material stable, be easy to effective control of each parameter; Owing to adopting RHVC, make drum's speed of rotation control accurate; Due to the electronic control dedusting air quantity regulating butterfly valve that employing shows with scale, make air quantity regulate precise control.The reduced iron powder that a powder of producing by this method makes in powder metallurgy secondary reduction, after testing, apparent density index all reaches standard-required, and not only apparent density control accuracy is high, and-325 the control of equigranular index good, also have production cost can reduce by 10～25%.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
Produce 2.6～3.0 g/cm
3powder of high apparent density, produce by following steps:
1, charging: qualified sponge iron is through cleaning with water, racking, the broken or Hubei Province of hammer is broken into the powder of particle diameter 10～15mm, is promoted to feed bin before ball milling, sends into ball mill grind by oscillating feeder, and oscillating feeder electric current adjustable range is 0～30A;
2, device parameter: ball mill adopts Φ 1830 × 7000 lattice type rolling grinding machines, and drive motors is YJR138-8-245KW; Oscillating feeder is GZ-3 type, feed ability 20T/h; PPS32-5 air box impulse bag-type dust remover is processed air quantity 11160m
3/ h, suction air volume size is realized by the control of DN350 Hand-operated butterfly valve.
3, parameter control: dedusting suction air volume is adjusted to 45o, oscillating feeder electric current is adjusted to 12A, open inlet scoop plate, ball mill running current is adjusted to 390A～410A, after 30 minutes, get magnetic separator discharging opening material powder and do apparent density chemical examination, pine fills time on the low side, strengthen oscillating feeder electric current to 15A, pine fills when higher, and dedusting suction air volume is adjusted to 47o, each adjustment sample analysis apparent density after 30 minutes, then finely tune until reach 2.6～3.0 g/cm
3pine reload request scope;
4, discharging: the bulky grain powder of granularity > 5mm is screened out by the monitoring that is arranged at grinding machine discharging opening, the powder of 5mm～150 μ m directly enters elevator, and the powder of < 150 μ m is evacuated to deduster at the heavy collection of cyclone separator, the superfine powder of < 45 μ m granularity after powder being extracted out by the dust arrester that is arranged at grinding machine discharging opening.The powder of described < 150 μ m is discharged with together with the powder of described granularity 5mm～150 μ m and is promoted to rotary screen screening by elevator through cyclone dust collectors discharging opening;
5, screening: the screenings that meets granularity requirements is promoted to storage silo after entering the magnetic separator magnetic separation that is arranged at rotary screen bottom, do not meet oversize feed back warehouse before feed back belt is delivered to ball milling of granularity requirements, need to quantitatively add ball mill to carry out grinding operation according to a meal component.
6, process monitoring: detect described magnetic separator discharging opening material powder apparent density per half an hour, contrasts with technological requirement, adjusts when deviation > 0.05 in time, realizes a powder apparent density of batch consistent.
When parameter adjustment, it should be noted that occur ball milling electric current lower than 390A, batcher electric current lower than 12A, dedusting suction air volume butterfly valve opening be greater than 47o any one time, the apparent density of a powder does not all reach 2.6 g/cm
3.
The powder of high apparent density that adopts this production method to produce, after testing, apparent density index all reaches standard-required, and production cost has reduced by 22%.
Embodiment 2
Produce 2.3～2.6 g/cm
3powder of middle apparent density, produce by following steps:
1, charging: qualified sponge iron is through cleaning with water, racking, the broken or Hubei Province of hammer is broken into the powder of particle diameter 10～15mm, is promoted to feed bin before ball milling, sends into ball mill grind by oscillating feeder, and oscillating feeder electric current adjustable range is 0～30A;
2, device parameter: ball mill adopts Φ 1830 × 7000 lattice type rolling grinding machines, and drive motors is YJR138-8-245KW; Oscillating feeder is GZ-3 type, feed ability 20T/h; PPS32-5 air box impulse bag-type dust remover is processed air quantity 11160m
3/ h, suction air volume size is realized by the control of DN350 Hand-operated butterfly valve.
3, parameter control: by dedusting suction air volume Hand-operated butterfly valve regulation to 55o, oscillating feeder electric current is adjusted to 8A, open inlet scoop plate, ball mill running current is adjusted to 350A, after 30 minutes, get magnetic separator discharging opening material powder and do apparent density chemical examination, pine fills time on the low side, ball mill running current is strengthened to 5～30A, the butterfly valve opening of air draught flow is adjusted to 72%～75%, strengthen oscillating feeder electric current to 10A, pine fills when higher, ball mill running current is reduced to 5～30A, dedusting suction air volume Hand-operated butterfly valve regulation is to 47o～50o, each adjustment sample analysis apparent density after 30 minutes, finely tune again until reach 2.3～2.6 g/cm
3pine reload request scope.
4, discharging: the bulky grain powder of granularity > 5mm is screened out by the monitoring that is arranged at grinding machine discharging opening, the powder of 5mm～150 μ m directly enters elevator, and the powder of < 150 μ m is evacuated to deduster at the heavy collection of cyclone separator, the superfine powder of < 45 μ m granularity after powder being extracted out by the dust arrester that is arranged at grinding machine discharging opening.The powder of described < 150 μ m is discharged with together with the powder of described granularity 5mm～150 μ m and is promoted to rotary screen screening by elevator through cyclone dust collectors discharging opening;
5, screening: the screenings that meets granularity requirements is promoted to storage silo after entering the magnetic separator magnetic separation that is arranged at rotary screen bottom, do not meet oversize feed back warehouse before feed back belt is delivered to ball milling of granularity requirements, need to quantitatively add ball mill to carry out grinding operation according to a meal component.
6, process monitoring: detect described magnetic separator discharging opening material powder apparent density per half an hour, contrasts with technological requirement, adjusts when deviation > 0.05 in time, realizes a powder apparent density of batch consistent.
When parameter adjustment, it should be noted that and occur that ball milling electric current is less than 40o or is greater than 60o lower than 7A, dedusting suction air volume butterfly valve opening lower than 320A, batcher electric current, the apparent density of a powder all exceeds 2.3～2.6 g/cm
3scope.
The powder of middle apparent density that adopts this production method to produce, after testing, apparent density index all reaches standard-required, and production cost has reduced by 25%.
Embodiment 3
Produce 2.0～2.3 low-apparent-density powder, produce by following steps:
1, charging: qualified sponge iron is through cleaning with water, racking, the broken or Hubei Province of hammer is broken into the powder of particle diameter 10～15mm, is promoted to feed bin before ball milling, sends into ball mill grind by oscillating feeder, and oscillating feeder electric current adjustable range is 0～30A;
2, device parameter: ball mill adopts Φ 1830 × 7000 lattice type rolling grinding machines, and drive motors is YJR138-8-245KW; Oscillating feeder is GZ-3 type, feed ability 20T/h; PPS32-5 air box impulse bag-type dust remover is processed air quantity 11160m
3/ h, aspiration size is realized by the control of DN350 Hand-operated butterfly valve.
3, parameter control: ball mill running current is adjusted between 280A～300A, dedusting suction air volume butterfly valve opening is adjusted to 65o, oscillating feeder electric current is adjusted to 4.5A, open inlet scoop plate, ball mill running current is adjusted to 290A, gets magnetic separator discharging opening material powder and do apparent density chemical examination after 30 minutes, pine fills time on the low side, ball mill running current is strengthened to 5～10A, dedusting air draught flow butterfly valve opening is adjusted to 65o～67.5o, strengthen oscillating feeder electric current 0.5～1A; Pine fills when higher, and ball mill running current is reduced to 5～10A, dedusting air draught flow butterfly valve opening is adjusted to 60o～63.5o, adjust 30 minutes at every turn after sample analysis apparent density, then finely tune until reach 2.0～2.3 g/cm
3pine reload request scope;
4, discharging: the bulky grain powder of granularity > 5mm is screened out by the monitoring that is arranged at grinding machine discharging opening, the powder of 5mm～150 μ m directly enters elevator, and the powder of < 150 μ m is evacuated to deduster at the heavy collection of cyclone separator, the superfine powder of < 45 μ m granularity after powder being extracted out by the dust arrester that is arranged at grinding machine discharging opening.The powder of described < 150 μ m is discharged with together with the powder of described granularity 5mm～150 μ m and is promoted to rotary screen screening by elevator through cyclone dust collectors discharging opening.
5, screening: the screenings that meets granularity requirements is promoted to storage silo after entering the magnetic separator magnetic separation that is arranged at rotary screen bottom, do not meet oversize feed back warehouse before feed back belt is delivered to ball milling of granularity requirements, need to quantitatively add ball mill to carry out grinding operation according to a meal component.
6, process monitoring: detect described magnetic separator discharging opening material powder apparent density per half an hour, contrasts with technological requirement, adjusts when deviation > 0.05 in time, realizes a powder apparent density of batch consistent.
When parameter adjustment, it should be noted that occur ball milling electric current higher than 310A, oscillating feeder electric current higher than 6A, dedusting air quantity butterfly valve opening be less than 70% any one time, the apparent density of a powder is all higher than 2.25.
The powder of low-apparent-density that adopts this production method to produce, after testing, apparent density index all reaches standard-required, and production cost has reduced by 10%.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (4)
1. utilize ball mill accurately to control the method for a powder apparent density, it is characterized in that, comprising:
1) charging: qualified sponge iron through clean with water, rack, hammer into shape broken or Hubei Province broken after, the powder of particle diameter 10～15mm is promoted to feed bin before ball milling, sends into ball mill grinding by oscillating feeder, oscillating feeder electric current adjustable range is 0～30A;
2) parameter control: the whole oscillating feeder electric current that is arranged at feeding of ball mill end is realized inlet amount control, the variation of adjustment ball mill Current Control drum's speed of rotation realizes grinding rate control and adjusts dedusting suction air volume size and realize the control of the fine powder amount of allocating into, by aforementioned three organic cooperations of technological parameter, reach apparent density index parameter at 2.0～3.0 g/cm
3the object that scope is accurately controlled;
3) discharging: discharging is divided into three parts: the bulky grain powder of granularity > 5mm is screened out by the monitoring that is arranged at grinding machine discharging opening, granularity is that the powder of 5mm～150 μ m directly enters elevator, the powder of granularity < 150 μ m sinks and collects at cyclone separator after powder being extracted out by the dust arrester that is arranged at grinding machine discharging opening, the powder of the utmost point of granularity < 45 μ m is evacuated to deduster, then the powder of described granularity < 150 μ m is discharged through cyclone dust collectors discharging opening and is promoted to rotary screen by elevator together with the powder that is 5mm～150 μ m with described granularity and screens,
4), screening: the screenings that meets granularity requirements is promoted to storage silo after entering the magnetic separator magnetic separation that is arranged at rotary screen bottom, do not meet oversize feed back warehouse before feed back belt is delivered to ball milling of granularity requirements, need to quantitatively add ball mill to carry out grinding operation according to a meal component.
2. the method for utilizing ball mill accurately to control a powder apparent density as claimed in claim 1, is characterized in that: described step 2) in parameter control be to produce 2.6～3.0 g/cm
3powder of high apparent density: ball mill Current Control is 83%～87% of rated current, and oscillating feeder Current Control is at 12A～15A, and dedusting air quantity butterfly valve opening is controlled at 42o～47o, regulated through 2～3 hours, and one time powder pine dress can be adjusted to 2.6 g/cm
3above.
3. the method for utilizing ball mill accurately to control a powder apparent density as claimed in claim 1, is characterized in that: described step 2) in parameter control be to produce 2.3～2.6 g/cm
3powder of middle apparent density: ball mill Current Control is 68%～81% of rated current, oscillating feeder Current Control is at 7A～10A, dedusting air quantity butterfly valve opening is controlled at 47o～60o, regulates through 2～3 hours, and one time powder pine dress can be adjusted to 2.35～2.55g/cm
3.
4. the method for utilizing ball mill accurately to control a powder apparent density as claimed in claim 1, it is characterized in that: described step 2) in parameter control be, produce powder of 2.0～2.3 low-apparent-density: ball mill Current Control is 60%～64% of rated current, oscillating feeder Current Control is at 4A～6A, dedusting air quantity butterfly valve opening is controlled at 60o～70o, regulated through 2～3 hours, one time powder pine dress can be adjusted to 2.1～2.25 g/cm
3.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550985A (en) * | 2014-12-22 | 2015-04-29 | 昆山德泰新材料科技有限公司 | Low-apparent-density copper zinc alloy brass powder and preparing method thereof |
| CN106824404A (en) * | 2016-12-20 | 2017-06-13 | 西北稀有金属材料研究院 | The method of raising ito powder apparent density and the tap density of being sieved by dry ball milling |
| CN108745605A (en) * | 2018-06-26 | 2018-11-06 | 湖南泰通能源管理股份有限公司 | A kind of intelligence grinding system control method |
| CN108788165A (en) * | 2018-06-15 | 2018-11-13 | 莱芜市泰东粉末科技有限公司 | A method of control low-apparent-density iron powder apparent density |
| CN112536886A (en) * | 2020-12-15 | 2021-03-23 | 山田研磨材料有限公司 | Process for improving apparent density of non-pressure granulation powder |
| CN114985747A (en) * | 2022-06-14 | 2022-09-02 | 山东泰山钢铁集团有限公司 | Method for quickly adjusting bulk density of primary powder |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550985A (en) * | 2014-12-22 | 2015-04-29 | 昆山德泰新材料科技有限公司 | Low-apparent-density copper zinc alloy brass powder and preparing method thereof |
| CN106824404A (en) * | 2016-12-20 | 2017-06-13 | 西北稀有金属材料研究院 | The method of raising ito powder apparent density and the tap density of being sieved by dry ball milling |
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| CN108788165A (en) * | 2018-06-15 | 2018-11-13 | 莱芜市泰东粉末科技有限公司 | A method of control low-apparent-density iron powder apparent density |
| CN108788165B (en) * | 2018-06-15 | 2021-10-12 | 莱芜市泰东粉末科技有限公司 | Method for controlling apparent density of low apparent density iron powder |
| CN108745605A (en) * | 2018-06-26 | 2018-11-06 | 湖南泰通能源管理股份有限公司 | A kind of intelligence grinding system control method |
| CN112536886A (en) * | 2020-12-15 | 2021-03-23 | 山田研磨材料有限公司 | Process for improving apparent density of non-pressure granulation powder |
| CN114985747A (en) * | 2022-06-14 | 2022-09-02 | 山东泰山钢铁集团有限公司 | Method for quickly adjusting bulk density of primary powder |
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Application publication date: 20141119 |