CN102228860A - Novel magnetite beneficiation process - Google Patents
Novel magnetite beneficiation process Download PDFInfo
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Abstract
The invention belongs to the technical field of magnetite beneficiation, and particularly relates to a novel magnetite beneficiation process. The novel magnetite beneficiation process is performed by carrying out first-stage grinding, classification for the first time, magnetic separation for the first time, classification for the second time, second-stage grinding, magnetic separation for the second time, screening for the first time, permanent dewatering, third-stage grinding, magnetic separation for the third time, magnetic separation for the fourth time, screening for the second time and magnetic separation for the fifth time on raw ore to obtain concentrate and tailings, wherein the selected ore is divided into normal, poor and good three cases, the grade of the selected ore of each case is divided into normal, high and low three conditions, the control parameters of an electromagnetic vibration net fine sieve are reasonably set, and the start-up number of the electromagnetic vibration net fine sieve and the starting of other related equipment are adjusted, so as to control the screening efficiency at 45-55% and the fluctuation of the grade of the minus sieve ore less than 0.5%. According to the invention, a control model and a control strategy for realizing the fully automatic operation of the electromagnetic vibration net fine sieve are provided, and the energy is saved and the consumption is reduced while guaranteeing the final product quality stability.
Description
Technical field
The invention belongs to the magnetite separation technical field, particularly relate to a kind of novel magnetite separation technology.
Background technology
It is at the seventies in last century that Anshan type magnetite separation technology is used dusting cover the earliest, its application once increased substantially the magnetite separation concentrate grade, what adopted at that time is nylon sieve plate, minimum sieve aperture is 0.15mm, percent opening only is about 7%, mode of vibration is for to vibrate whole sieve nest by mechanical knocking device, and screening efficiency only is 15～20%; The nineties is beaten on the basis of dusting cover at original fixedly dusting cover or machinery and is applied with the high frequency vibrating fine screen of vibrating motor as vibrating device, although vibration frequency high vibrate remain whole sieve nest, screening efficiency is the highest can to reach 30%.Having occurred successively with the electromagnetic force since this century is the electric and magnetic oscillation vibrating dusting cover of the direct vibration screen of vibration source, characteristics are that screen cloth adopts metal knitted net, the sieve aperture minimum can reach 0.07mm, net hole rate of screen cloth is up to about 35%, and vibration parameters can be regulated by computer, and screening efficiency significantly improves, the highlyest can reach 55%, the effect of upgrading is obvious, compares with original dusting cover, and is all obviously progressive from operating index.At present national most magnetite separation factory has all used electric and magnetic oscillation vibrating dusting cover.Ore washability quality is that the height of concentrate grade was weighed after process magnetic separation pipe sorted under a certain grinding particle size condition before selected with ore in the magnetite separation technology, and what its reflected is the height of ore liberation degree of minerals.And the grade of milling ore own is also different, and what its reflected is the variation of flow process amount.But, because China's most of magnetic iron ore ore head grade is all on the low side, have that disseminated grain size is thin, skewness, head grade and washability change the characteristics that wait greatly, exist the screening efficiency fluctuation big with electric and magnetic oscillation vibrating dusting cover as upgrading device, cause the big defective of operation index fluctuation, also do not have at present a cover ripe, scientifically adjust electric and magnetic oscillation vibrating dusting cover operating parameter and guarantee the stable effective ways of operation index.
Summary of the invention
The purpose of this invention is to provide a kind of novel magnetite separation technology, rationally adjust electric and magnetic oscillation vibrating dusting cover operating parameter, make electric and magnetic oscillation vibrating dusting cover screening efficiency stable in the reasonable scope, come stable electrical magnetic vibration vibrating dusting cover to sort process quality by stable electrical magnetic vibration vibrating dusting cover screening efficiency, reach stable end product quality, energy saving purposes.
The objective of the invention is to realize by following technical proposals:
According to novel magnetite separation technology of the present invention, comprise that raw ore is through primary grinding, scalping, a magnetic separation, the secondary classification, secondary grinding, the secondary magnetic separation, once screening, a permanent magnetism dehydration, three sections ore grindings, three magnetic separation, the dehydration of secondary permanent magnetism, regrading, four magnetic separation, select concentrate and tailings, it is characterized in that getting scalping overflow sample, being milled to the particle of percent by volume more than 90% reaches and carries out laboratory magnetic separation pipe behind-200 orders and sort and assay, overflow sample grade is as head grade, concentrate grade height after the magnetic separation pipe sorts is as the foundation of judging ore washability quality, raw ore magnetic separation pipe concentrate grade is a standard ore washability during with design, with design head grade 30% is the standard head grade
The screening machine that described once screening, regrading are used is an electric and magnetic oscillation vibrating dusting cover, and the operating parameter of electric and magnetic oscillation vibrating dusting cover is:
(1) under the ore washability normal condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 60～62%,
A, when head grade just often, with 3～6 minutes blanking times of shaking in oscillation intensity 40～45%, wink, the intensity 70～75% of shaking in wink, the vibration frequency 3000 times/minute is canonical parameter control, the compass screen surface of assurance electric and magnetic oscillation vibrating dusting cover divides the ore deposit even,
B, when head grade is higher, what then increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, shaking in wink is adjusted into 2～3 minutes blanking time, and oscillation intensity is adjusted into 45-50%, other parameter remains unchanged
C, when head grade is on the low side, even for guaranteeing compass screen surface branch ore deposit, shaking in wink is adjusted into 6～7 minutes blanking time, other parameter remains unchanged, reduce the secondary grinding machine and start the platform number,
(2) under the ore washability poor condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 58～60%,
A, when head grade just often, parameter is set at oscillation intensity 35～40%, 3～6 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 65～70%, the vibration frequency 3000 times/minute, increase the secondary grinding machine and start the platform number, reduce separate unit secondary grinding machine treating capacity, improve the fineness of going into to sieve material
B, when head grade is higher, what increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, oscillation intensity is adjusted into 45-50%, shakes in wink to keep normal 3～6 minutes blanking time, and the intensity of shaking in wink is adjusted into 65～75%, other parameter remains unchanged, increase the secondary grinding machine and start the platform number, reduce separate unit secondary grinding machine treating capacity, treating capacity reduces 5～10% during the primary grinding board, improve the fineness of going into to sieve material
C, when head grade is on the low side, reduce electric and magnetic oscillation vibrating dusting cover and start the platform number, in the mine-supplying quantity allowed band, increase mine-supplying quantity, guarantee that compass screen surface branch ore deposit is even, the time of shaking in wink is adjusted into 6～7 minutes, and oscillation intensity is adjusted into 35～40%, and the intensity of shaking in wink is adjusted into 65～75%, other parameter remains unchanged
(3) under the condition that the ore washability is good, be that the particle of percent by volume more than 90% reaches-200 orders, magnetic separation pipe concentrate grade is more than 62%, no matter head grade is normal, higher or on the low side, all reduce electric and magnetic oscillation vibrating dusting cover mine-supplying quantity, oscillation intensity is adjusted into 50～55%, and the time interval of shaking in wink is adjusted into 1～2 minute, reduces the secondary grinding machine and starts the platform number.
The operating parameter of preferred electric and magnetic oscillation vibrating dusting cover is:
(1) when scalping overflow sample when grade is 60.5% after the magnetic separation pipe sorts,
A, when head grade is 30.5%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute,
B, when head grade is 28%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 6 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute reduces once screening, regrading, permanent magnetism dehydration, regrinds and start the platform number
C, when head grade is 33%, then once screening, the regrading operating parameter is set at oscillation intensity 47%, the 2 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increase once screening, regrading, permanent magnetism dehydration, secondary grinding starts the platform number, reduce once screening, regrading separate unit mine-supplying quantity
(2) when scalping overflow sample when grade is 58% after the magnetic separation pipe sorts,
A, when head grade is 30.5%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 70%, and the vibration frequency 3000 times/minute increases secondary grinding and starts the platform number, improve secondary classification overflow product fineness
B, when head grade is 28%, then once screening, regrading operating parameter are set at oscillation intensity and are adjusted into 35%, shake in wink 6 minutes blanking times, the intensity 65% of shaking in wink, the vibration frequency 3000 times/minute, minimizing once screening, regrading are started the platform number, increase its separate unit mine-supplying quantity, improve secondary classification overflow product fineness
C, when head grade is 33%, then once screening, the regrading operating parameter is set at oscillation intensity 47%, the 4 minutes blanking times of shaking in wink, the intensity 70% of shaking in wink, the vibration frequency 3000 times/minute, increase secondary grinding and start the platform number, the new mine-supplying quantity of primary grinding reduces 8%, improve scalping, secondary classification overflow product fineness
(3) when scalping overflow sample when grade is 63% after the magnetic separation pipe sorts, head grade height no matter, once screening, the regrading operating parameter all is set at oscillation intensity 52%, 1～2 minute blanking time of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increasing once, screening, regrading start the platform number, improve screening efficiency, increase saturating sieve effect, reduce secondary grinding and start the platform number.
Advantage of the present invention has: the present invention is directed to widespread usage electric and magnetic oscillation vibrating dusting cover in the magnetite separation technology as the state of art that improves iron concentrate grade, determine method according to the milling ore washability changes and the operation of head grade variation carrying out electric and magnetic oscillation vibrating dusting cover is adjusted, make screening efficiency stable in the reasonable scope, electric and magnetic oscillation vibrating dusting cover sieve grade fluctuation down is controlled in 0.5%, effectively fill up operation adjustment blank when using MVS electric and magnetic oscillation vibrating dusting cover in the magnetite separation technology, can make the operating dutyization of electric and magnetic oscillation vibrating dusting cover, sequencing, for realizing that Automatic Control provides control model and control strategy, make this critical process index of electric and magnetic oscillation vibrating dusting cover stable, be implemented in and guarantee energy-saving and cost-reducing target under the stable prerequisite of end product quality.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment.
As shown in Figure 1, according to novel magnetite separation technology of the present invention, comprise that raw ore 1 is through primary grinding 2, scalping 3, a magnetic separation 4, secondary classification 5, secondary magnetic separation 6, secondary grinding 7, once sieve 8, a permanent magnetism dehydration 9, three sections ore grindings 10, three magnetic separation 11, secondary permanent magnetism dehydration 12, regrading 13, four magnetic separation 14, select concentrate and tailings, it is characterized in that getting scalping 3 overflow samples, being milled to the particle of percent by volume more than 90% reaches and carries out laboratory magnetic separation pipe behind-200 orders and sort and assay, overflow sample grade is as head grade, concentrate grade height after the magnetic separation pipe sorts is as the foundation of judging ore washability quality, raw ore magnetic separation pipe concentrate grade is a standard ore washability during with design, with design head grade 30% is the standard head grade
Describedly once sieve 8, the screening machine of regrading 13 usefulness is electric and magnetic oscillation vibrating dusting cover, MVS electric and magnetic oscillation vibrating dusting cover for example, the operating parameter of electric and magnetic oscillation vibrating dusting cover is:
(1) under the raw ore 1 washability normal condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 60-62%,
A, when raw ore 1 grade just often, with the 4 minutes blanking times of shaking in oscillation intensity 40%, wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute is canonical parameter control, the compass screen surface of assurance electric and magnetic oscillation vibrating dusting cover divides the ore deposit even,
B, when raw ore 1 grade is higher, what then increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, shaking in wink is adjusted into 2～3 minutes blanking time, and oscillation intensity is adjusted into 45-50%, other parameter remains unchanged
C, when raw ore 1 grade is on the low side, even for guaranteeing compass screen surface branch ore deposit, shaking in wink is adjusted into 5～6 minutes blanking time, other parameter remains unchanged, reduce the secondary grinding machine and start the platform number,
(2) under the raw ore 1 washability poor condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 58-60%,
A, when raw ore 1 grade just often, parameter is set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 70%, the vibration frequency 3000 times/minute, increase the secondary grinding machine and start the platform number, reduce separate unit secondary grinding machine treating capacity, improve the fineness of going into to sieve material
B, when raw ore 1 grade is higher, what increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, oscillation intensity is adjusted into 45-50%, shakes in wink to keep normal 4 minutes blanking time, and the intensity of shaking in wink is adjusted into 70%, other parameter remains unchanged, increase secondary grinding machine 10 and start the platform number, reduce separate unit secondary grinding machine treating capacity, treating capacity reduces 5-10% during the primary grinding board, improve the fineness of going into to sieve material
C, when head grade is on the low side, reduce electric and magnetic oscillation vibrating dusting cover and start the platform number, in the mine-supplying quantity allowed band, increase mine-supplying quantity, guarantee that compass screen surface branch ore deposit is even, the time of shaking in wink is adjusted into 6 minutes, and oscillation intensity is adjusted into 35-40%, the intensity of shaking in wink is adjusted into 65%, and other parameter remains unchanged
(3) under the condition that raw ore 1 washability is good, be that the particle of percent by volume more than 90% reaches-200 orders, magnetic separation pipe concentrate grade is more than 62%, no matter head grade is normal, higher or on the low side, all reduce electric and magnetic oscillation vibrating dusting cover mine-supplying quantity, oscillation intensity is adjusted into 50-55%, and the time interval of shaking in wink is adjusted into 1～2 minute, reduces the secondary grinding machine and starts the platform number.
Embodiment
As shown in Figure 1, the operating parameter of described electric and magnetic oscillation vibrating dusting cover is:
(1) when scalping 3 overflow samples when grade is 60.5% after the magnetic separation pipe sorts,
A, when head grade is 30.5%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute,
B, when raw ore 1 grade is 28%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity 40%, the 6 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, reduce once sieve 8, regrading 13, dehydration permanent magnetism 9, secondary grinding 10 start the platform number
C, when head grade is 33%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity 47%, the 2 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increase once sieve 8, regrading 13, permanent magnetism dehydration 9, secondary grinding 10 start the platform number, reduce once sieve 8, regrading 13 separate unit mine-supplying quantities
(2) when scalping 3 overflow samples when grade is 58% after the magnetic separation pipe sorts,
A, when raw ore 1 grade is 30.5%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 70%, the vibration frequency 3000 times/minute, increase secondary grinding 10 and start the platform number, improve secondary classification 5 overflow product finenesses
B, when raw ore 1 grade is 28%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity and are adjusted into 35%, shake in wink 6 minutes blanking times, the intensity 65% of shaking in wink, the vibration frequency 3000 times/minute, reduce once sieve 8, regrading 13 starts the platform number, increases its separate unit mine-supplying quantity, improve secondary classification 5 overflow product finenesses
C, when head grade is 33%, then once sieve 8, regrading 13 operating parameters are set at oscillation intensity 47%, the 4 minutes blanking times of shaking in wink, the intensity 70% of shaking in wink, the vibration frequency 3000 times/minute, increase secondary grinding 10 and start the platform number, primary grinding 2 new mine-supplying quantities reduce 8%, improve scalping 3, secondary classification 5 overflow product finenesses
(3) when scalping 3 overflow samples when grade is 63% after the magnetic separation pipe sorts, head grade height no matter, once sieve 8, regrading 13 operating parameters all are set at oscillation intensity 52%, 1～2 minute blanking time of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increase once sieve 8, regrading 13 starts the platform number, improve screening efficiency, increase saturating sieve effect, reduce secondary grinding 10 and start the platform number.
The present invention is divided into normal, the relatively poor three kinds of situations of becoming reconciled with magnetite separation technology milling ore washability, be divided into selected normal, the high and low three kinds of conditions of head grade under three kinds of situations again, rationally set electric and magnetic oscillation vibrating dusting cover control parameter respectively, adjust electric and magnetic oscillation vibrating dusting cover and start starting of platform number and Other related equipment, guarantee that screening efficiency is controlled between the 45-55%, sieve concentrate grade fluctuation down is lower than 0.5%.According to the corresponding relation that between the oscillation intensity (amplitude) of sieve under the suitable situation of giving ore deposit condition (concentration, granularity, mine-supplying quantity, screen cloth are close service time) and screening efficiency, exists, with the 4 minutes blanking times of shaking in oscillation intensity 40%, wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute is controlled parameter for standard, is optimum target with screening efficiency 40-50%.
Technology of the present invention makes screening efficiency stable in the reasonable scope, electric and magnetic oscillation vibrating dusting cover sieve grade fluctuation down is controlled in 0.5%, effectively fill up operation adjustment blank when using MVS electric and magnetic oscillation vibrating dusting cover in the magnetite separation technology, can make operating dutyization, the sequencing of electric and magnetic oscillation vibrating dusting cover, for realizing that Automatic Control provides control model and control strategy, make this critical process index of electric and magnetic oscillation vibrating dusting cover stable, be implemented in and guarantee energy-saving and cost-reducing target under the stable prerequisite of end product quality.
Claims (2)
1. novel magnetite separation technology, comprise that raw ore is through primary grinding, scalping, a magnetic separation, the secondary classification, secondary grinding, the secondary magnetic separation, once screening, a permanent magnetism dehydration, three sections ore grindings, three magnetic separation, the dehydration of secondary permanent magnetism, regrading, four magnetic separation, select concentrate and tailings, it is characterized in that getting scalping overflow sample, being milled to the particle of percent by volume more than 90% reaches and carries out laboratory magnetic separation pipe behind-200 orders and sort and assay, overflow sample grade is as head grade, concentrate grade height after the magnetic separation pipe sorts is as the foundation of judging ore washability quality, raw ore magnetic separation pipe concentrate grade is a standard ore washability during with design, with design head grade 30% is the standard head grade
The screening machine that described once screening, regrading are used is an electric and magnetic oscillation vibrating dusting cover, and the operating parameter of electric and magnetic oscillation vibrating dusting cover is:
(1) under the ore washability normal condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 60～62%,
A, when head grade just often, with 3～6 minutes blanking times of shaking in oscillation intensity 40～45%, wink, the intensity 70～75% of shaking in wink, the vibration frequency 3000 times/minute is canonical parameter control, the compass screen surface of assurance electric and magnetic oscillation vibrating dusting cover divides the ore deposit even,
B, when head grade is higher, what then increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, shaking in wink is adjusted into 2～3 minutes blanking time, and oscillation intensity is adjusted into 45-50%, other parameter remains unchanged
C, when head grade is on the low side, even for guaranteeing compass screen surface branch ore deposit, shaking in wink is adjusted into 6～7 minutes blanking time, other parameter remains unchanged, reduce the secondary grinding machine and start the platform number,
(2) under the ore washability poor condition, promptly the particle of percent by volume more than 90% reaches-200 orders, and magnetic separation pipe concentrate grade is 58～60%,
A, when head grade just often, parameter is set at oscillation intensity 35～40%, 3～6 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 65～70%, the vibration frequency 3000 times/minute, increase the secondary grinding machine and start the platform number, reduce separate unit secondary grinding machine treating capacity, improve the fineness of going into to sieve material
B, when head grade is higher, what increase electric and magnetic oscillation vibrating dusting cover starts the platform number, reduces in the mine-supplying quantity allowed band and gives the ore deposit volume, guarantee that compass screen surface branch ore deposit is even, oscillation intensity is adjusted into 45-50%, shakes in wink to keep normal 3～6 minutes blanking time, and the intensity of shaking in wink is adjusted into 65～75%, other parameter remains unchanged, increase the secondary grinding machine and start the platform number, reduce separate unit secondary grinding machine treating capacity, treating capacity reduces 5～10% during the primary grinding board, improve the fineness of going into to sieve material
C, when head grade is on the low side, reduce electric and magnetic oscillation vibrating dusting cover and start the platform number, in the mine-supplying quantity allowed band, increase mine-supplying quantity, guarantee that compass screen surface branch ore deposit is even, the time of shaking in wink is adjusted into 6～7 minutes, and oscillation intensity is adjusted into 35～40%, and the intensity of shaking in wink is adjusted into 65～75%, other parameter remains unchanged
(3) under the condition that the ore washability is good, be that the particle of percent by volume more than 90% reaches-200 orders, magnetic separation pipe concentrate grade is more than 62%, no matter head grade is normal, higher or on the low side, all reduce electric and magnetic oscillation vibrating dusting cover mine-supplying quantity, oscillation intensity is adjusted into 50～55%, and the time interval of shaking in wink is adjusted into 1～2 minute, reduces the secondary grinding machine and starts the platform number.
2. novel magnetite separation technology according to claim 1 is characterized in that the operating parameter of described electric and magnetic oscillation vibrating dusting cover is:
(1) when scalping overflow sample when grade is 60.5% after the magnetic separation pipe sorts,
A, when head grade is 30.5%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute,
B, when head grade is 28%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 6 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute reduces once screening, regrading, permanent magnetism dehydration, regrinds and start the platform number
C, when head grade is 33%, then once screening, the regrading operating parameter is set at oscillation intensity 47%, the 2 minutes blanking times of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increase once screening, regrading, permanent magnetism dehydration, secondary grinding starts the platform number, reduce once screening, regrading separate unit mine-supplying quantity
(2) when scalping overflow sample when grade is 58% after the magnetic separation pipe sorts,
A, when head grade is 30.5%, then once screening, the regrading operating parameter is set at oscillation intensity 40%, the 4 minutes blanking times of shaking in wink, the intensity of shaking in wink be adjusted into 70%, and the vibration frequency 3000 times/minute increases secondary grinding and starts the platform number, improve secondary classification overflow product fineness
B, when head grade is 28%, then once screening, regrading operating parameter are set at oscillation intensity and are adjusted into 35%, shake in wink 6 minutes blanking times, the intensity 65% of shaking in wink, the vibration frequency 3000 times/minute, minimizing once screening, regrading are started the platform number, increase its separate unit mine-supplying quantity, improve secondary classification overflow product fineness
C, when head grade is 33%, then once screening, the regrading operating parameter is set at oscillation intensity 47%, the 4 minutes blanking times of shaking in wink, the intensity 70% of shaking in wink, the vibration frequency 3000 times/minute, increase secondary grinding and start the platform number, the new mine-supplying quantity of primary grinding reduces 8%, improve scalping, secondary classification overflow product fineness
(3) when scalping overflow sample when grade is 63% after the magnetic separation pipe sorts, head grade height no matter, once screening, the regrading operating parameter all is set at oscillation intensity 52%, 1～2 minute blanking time of shaking in wink, the intensity 75% of shaking in wink, the vibration frequency 3000 times/minute, increasing once, screening, regrading start the platform number, improve screening efficiency, increase saturating sieve effect, reduce secondary grinding and start the platform number.
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| CN102794226A (en) * | 2012-08-31 | 2012-11-28 | 本溪市平山区佳鑫铁选厂 | Mineral processing method of fine-particle magnetite |
| CN104128259A (en) * | 2014-07-28 | 2014-11-05 | 鞍钢集团矿业公司 | Simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore |
| CN106000597A (en) * | 2016-05-27 | 2016-10-12 | 鞍钢集团矿业公司 | Lean magnetite single magnetic separation-magnetic vibration machine separation process |
| CN107552203A (en) * | 2017-09-25 | 2018-01-09 | 安徽金安矿业有限公司 | A kind of method and device for improving ball mill grinding efficiency |
| CN110038713A (en) * | 2019-03-29 | 2019-07-23 | 中冶北方（大连）工程技术有限公司 | Apatite magnetite beneficiation process |
| CN110586246A (en) * | 2019-09-29 | 2019-12-20 | 陈琪 | Avoid mechanical grinding device of jam |
| CN111068897A (en) * | 2019-12-20 | 2020-04-28 | 辽宁科技学院 | Fine particle magnetite beneficiation process |
| CN112170000A (en) * | 2020-09-18 | 2021-01-05 | 滦平建龙矿业有限公司 | Pre-screening treatment system and process for magnetite high-pressure roller mill before grinding |
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| CN102794226A (en) * | 2012-08-31 | 2012-11-28 | 本溪市平山区佳鑫铁选厂 | Mineral processing method of fine-particle magnetite |
| CN104128259A (en) * | 2014-07-28 | 2014-11-05 | 鞍钢集团矿业公司 | Simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore |
| CN104128259B (en) * | 2014-07-28 | 2016-06-01 | 鞍钢集团矿业公司 | Anshan type is containing the iron carbonate single magnetic separation process of chromium depleted zone stone |
| CN106000597A (en) * | 2016-05-27 | 2016-10-12 | 鞍钢集团矿业公司 | Lean magnetite single magnetic separation-magnetic vibration machine separation process |
| CN107552203A (en) * | 2017-09-25 | 2018-01-09 | 安徽金安矿业有限公司 | A kind of method and device for improving ball mill grinding efficiency |
| CN110038713A (en) * | 2019-03-29 | 2019-07-23 | 中冶北方（大连）工程技术有限公司 | Apatite magnetite beneficiation process |
| CN110586246A (en) * | 2019-09-29 | 2019-12-20 | 陈琪 | Avoid mechanical grinding device of jam |
| CN111068897A (en) * | 2019-12-20 | 2020-04-28 | 辽宁科技学院 | Fine particle magnetite beneficiation process |
| CN112170000A (en) * | 2020-09-18 | 2021-01-05 | 滦平建龙矿业有限公司 | Pre-screening treatment system and process for magnetite high-pressure roller mill before grinding |
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| CN102228860B (en) | 2013-01-16 |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |