CN110479467A - A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone - Google Patents
A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone Download PDFInfo
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- CN110479467A CN110479467A CN201910801582.6A CN201910801582A CN110479467A CN 110479467 A CN110479467 A CN 110479467A CN 201910801582 A CN201910801582 A CN 201910801582A CN 110479467 A CN110479467 A CN 110479467A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention discloses a kind of high pressure roller mill dry screening wet type pre-selecting techniques of chromium depleted zone stone, belong to technical field of beneficiation.It includes the following steps, one, broken: chromium depleted zone stone raw ore being crushed, crushed product size -30mm；Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation tailing of dishing out obtains dry type magnetic separation concentrate；Three, roller mill screening: after dry type magnetic separation concentrate carries out high pressure roller mill, the miberal powder that dry screen separates granularity -3mm enters next step；Four, midfield high intensity magnetic separation: ore pulp is formed after miberal powder is mixed with water and enters midfield intensity magnetic separator wet magnetic separation, the concentrate after magnetic separation enters next step, and tailing is dished out；Five, grading ball milling: the concentrate after wet magnetic separation carries out grading ball milling in milling system.The present invention is greatly saved water consumption and energy consumption, reduces equipment construction investment, thereby reduced production cost, and preselect high-efficient using dry type primary election+high pressure roller mill dry screening+wet magnetic separation+classification processing technique.
Description
Technical field
The invention belongs to magnetic iron ore technical field of beneficiation, more specifically to a kind of high pressure roller of chromium depleted zone stone
Grind dry screening wet type pre-selecting technique.
Background technique
With the quickening year by year of domestic mine resources exploitation rate, it is few that the mine resources in China have tended to rich ore day, lean ore
More, ore properties are poor, and grain size number is low, sort difficult situation, face this " poor, thin, miscellaneous " actual state of ore, tradition
Ore-dressing technique be also gradually substituted instead the high efficiency of ore-dressing technique, it is intelligent and to different ore properties
Targeted design.With the variation year by year of ore properties, the reduction year by year of mining grade is brought to the operation cost in dressing plant
Large effect.It since the grade of ore is low, causes ore to enter to grind grade low, enters that mill amount is big, and ore grinding is at high cost, low efficiency, needle
To this situation, indispensable a part in dressing plant's ore-dressing technique is become for the pre-selecting before grinding technique of lean ore.
High-pressure roller mill is a kind of ore ultrafine grinding equipment of novel energy-conserving, to reinforcing crushing operation efficiency, improves ore grinding
Efficiency, reduction beneficiation cost have significant economic significance, and with the development of high-pressure roller mill, more and more dressing plants are introduced
High-pressure roller mill is as an important step in pre-selection technique, due to, sieve pore blockade etc. low by dry screening screening efficiency
Problem, the high pressure roller mill technique of country's chromium depleted zone is mainly the fully closed road of wet screening, undersize wet magnetic separation technique at present.
I.e. high-pressure roller mill product feeds straight line shaker and carries out wet screening, and undersize carries out wet magnetic separation, and magnetic separation rough concentrate passes through slag
Stock pump is delivered to one section of ball grinder graded system and carries out subsequent mill ore magnetic selection operation, due to high pressure roller mill under this process conditions
Screening magnetic separation workshop and ball milling main building have a certain distance, it is difficult to which gravity flow feeds one section of ball grinder graded system, generallys use slag
Stock pump is delivered to ball grinder graded system, and since magnetic iron ore rough concentrate is after high pressure roller mill, concentrate grain corner is clearly demarcated, to slurry
The flow passage part abrasion of pump is big, and transportation cost is high, affects the implementation of the technique, furthermore uses high pressure to north cold area
Roller grinds wet screening scheme, and the conveying of wet type material needs to increase heating facility, and investment and operation cost is caused to increase.
Through retrieving, China Patent Publication No.: CN102198425A, publication date: on September 28th, 2011 is disclosed a kind of super
Chromium depleted zone dry type tailings discarding by preconcentration technique, process flow are as follows: by partial size≤70mm it is thick in broken product through one section closed circuit fine crushing, grain
Degree reaches 10~15mm, the magnetic separator dry type weak magnetic roughing for being 1800~2000Oe through magnetic field strength, ahead of time a large amount of big grain of jettisoning
Diameter tailing, then through one section of closed circuit high-pressure roller mill ultrafine grinding, granularity reaches 3~5mm, is 1600~1800Oe's through magnetic field strength
Magnetic separator dry type weak magnetic is selected, then a large amount of tailings of jettisoning, finally obtains pre- concentrate selection.This application technique using with high pressure
The equipment that roller mill forms closed circuit screening is traditional 1500 × 3000 self-fixed centre shale shaker of SZZ type, the equipment screening efficiency
Very low, circulating load is very big, and industrial application cannot effectively be implemented；Furthermore the undersize after high pressure roller mill uses dry type magnetic separation,
Low efficiency, the Amplitude Ratio wet type low 50% or more that iron concentrate grade improves are sorted, and brings dust (needing dust removal installation)
Problem, metal mine cannot promote and apply at home.
Through retrieving, China Patent Publication No.: publication date: CN105855020B is disclosed and a kind of on November 28th, 2017
High pressure roller mill-dry type preselects chromium depleted zone technique, it is characterised in that includes the following steps: that a) chromium depleted zone raw ore is by rough and torn
Product after broken, middle crushing operation feeds high pressure roller mill-dry separation magnetic separator and is sorted, b) by grade be 54%~55% it is dry
Concentrate selection feeds grinding machine again and regrinds, c) the machine granularity of regrinding is reached into the product of -200 95% or more mesh contents by one section of low intensity magnetic separation
Machine carries out sorting operation, obtains a stage magnetic separator concentrate；D) the stage magnetic separator concentrate and two sections of magnetic for being 60%-61% by grade
Vibration machine is sorted, and the final concentrate of grade 67.5%-68% is obtained, although the technique of this application can also save water consume,
Water supply consumption is reduced, and more high-grade concentrate can be obtained, but compared with high pressure roller mill sieves full closed circuit technique, this application
High pressure roller mill be open circuit roller grinding process, roller mill after granularity it is thicker, dry type throw tail low yield, dry type throw tail improve amplitude compared with
It is low, reduce the production efficiency of high-pressure roller mill.
Summary of the invention
1, it to solve the problems, such as
It is big for water consumption in high pressure roller mill chromium depleted zone stone wet type pre-selecting technique in the prior art, energy consumption is high, dry type is pre-
Susceptible to plugging problem is sieved in choosing, and the present invention provides a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone, adopts
With dry type primary election+high pressure roller mill dry screening+wet magnetic separation+classification processing technique, water consumption and energy consumption is greatly saved, and
It is good to preselect effect.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone, steps are as follows:
One, it is crushed: chromium depleted zone stone raw ore being crushed, crushed product size -30mm；
Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation tailing of dishing out obtains dry type magnetic separation essence
Mine；
Three, roller mill screening: after dry type magnetic separation concentrate carries out high pressure roller mill, under the miberal powder that dry screen separates granularity -3mm enters
One step；
Four, midfield high intensity magnetic separation: ore pulp is formed after miberal powder is mixed with water and enters midfield intensity magnetic separator wet magnetic separation, after magnetic separation
Concentrate enter next step, tailing is dished out；
Five, grading ball milling: the concentrate after wet magnetic separation carries out grading ball milling in milling system.
In traditional pre-selection technique, since the matching used wet screening water consumption of high pressure roller mill is big, and the mine after screening
Slurry can only be transported by Pulp pump, and ore pulp particle wears very big, transfer pipeline under cold climate to Pulp pump in Pulp pump
Easy freezing again, therefore the disadvantage that traditional handicraft water consumption is big, energy consumption is high is caused, and use high pressure roller mill and dry screening mating
In use, exist again, screening efficiency is low, susceptible to plugging defect, and in view of the foregoing drawbacks, this programme improves pre-selection technique:
The raw iron ores that this programme is 68~80% for occupation rate of the TFe grade less than 30%, Armco magnetic iron Zhan Quantie
It is preselected, first passes through destruction step, be crushed raw ore using conventional Three stage crushing with single closed circuit stage technique, by screening,
Undersize degree is sent in the ore of -30mm to next step, and controlling undersize degree is the effect in order to guarantee subsequent magnetic separation in -30mm
Granularity is sent in the ore of+30mm and is easy to cause tailings grade excessively high to subsequent magnetic separation step or magnetic concentrate grade is too low by fruit
The case where occur；
Ore of the granularity in -30mm carries out the strong dry type magnetic separation in midfield, the ore for granularity in -30mm, the field strength in
Dry-type magnetic extractor, which can effectively sort out magnetic iron ore, to be come, the primary election step of this programme, by the strong dry type magnetic separation in midfield, by ore
In obvious useless tailing skim, tentatively select concentrate and be sent into subsequent step, the processing difficulty of subsequent step is alleviated, to raising
The grade for entering ore grinding stone is beneficial, and dry type magnetic separation controls water consumption without consuming water resource；
Concentrate after the strong dry type magnetic separation in midfield is subjected to high pressure roller mill, concentrate is levigate, screen out the mine that granularity is -3mm
Powder, primary election and roller mill screening are all made of dry process, and the mineral after the broken of the application, primary election process are being done
It is low that dry screening screening efficiency is overcome when the mill screening of formula roller, the susceptible to plugging problem of sieve pore, and water resource is not consumed, it avoids and draws
Enter water resource bring equipment and energy consumption, and the progress of ore transmission device can be used in the mineral aggregate after primary election and roller mill screening
Transmission has saved production cost without equipment investments such as Pulp pump, pipelines, applicants have found that, in this step, concentrate
That grinds is thinner, and the grade for entering concentrate before grinding is higher, and mining tailing rate is lower, the pre-selection that comprehensive production cost and subsequent technique cooperate
Effect considers that the powder particle size that control roller mill screens out is -3mm；
Concentrate powder after roller mill screening forms ore pulp and feeds midfield intensity magnetic separator progress wet magnetic separation, magnetic after mixing with water
Concentrate gravity flow after choosing is fed in subsequent milling system, and tailing is dished out, this step is ensured by wet magnetic separation feeds concentrate
Grade, compared to existing dry type Primary Election Law, it is more preferable that this programme preselects effect, compared to traditional wet type pre-selecting method, this
Scheme obtains concentrate powder by preposition dry process step, water need to be only added in the high intensity magnetic separation step of midfield, and final ore pulp is also
It can flow automatically and feed Ball Mill System, it is entirely avoided the drawbacks of traditional wet Primary Election Law；
After concentrate slurry gravity flow after wet magnetic separation feeds milling system, it is classified, the iron for avoiding part dissociated
Ore carry out ball milling after cause it is overground, to further increase the rate of recovery.
Further, the milling system is that one section of ball mill and hydrocyclone form closed circuit grinding system, wet type
Concentrate slurry gravity flow after magnetic separation feeds cyclone in mine pump pond.
One section of ball mill and hydrocyclone form closed circuit grinding system, and the sand setting of hydrocyclone feeds one section of ball milling
Machine, the ore discharge of one section of ball mill feed pumping in pond to mine for one section of cyclone, and the overflow of hydrocyclone carries out subsequent ore grinding
Operation, the closed circuit grinding system being made up of water conservancy cyclone and one section of ball mill, to the concentrate of wet magnetic separation before ball milling
Slurry is classified, after avoiding the iron ore that has dissociated of part from entering ball milling caused by it is overground, improve the rate of recovery, further decrease
Ore grinding cost.
Further, the magnetic field strength of the strong dry type magnetic separation in midfield is 280~350kA/m in step 2.
The strong dry type magnetic separation in midfield is carried out using magnetic pulley equipment in this programme, control magnetic field strength in 280~350kA/m,
Applicants have found that the ore grain size and magnetic field strength when primary election affect the grade of pre- concentrate selection, the increase of ore grain size
And the increase of magnetic field strength will lead to the grade reduction of pre- concentrate selection, but reduction magnetic field strength simply can be such that concentrate recycles
Rate decline, it is therefore desirable to comprehensively consider the scope of application to determine ore grain size and magnetic field strength, when primary election ore grain size be+
When 30mm, to guarantee to reach rate of recovery index, higher magnetic field strength is needed, but higher magnetic field strength can recycle a part
With the weak magnetic gangue mineral of strongly magnetic mineral adhesion, so that concentrate grade accordingly reduces, pre-selection effect is affected, and works as primary election
Ore grain size be -30mm when, with the increase of magnetic field strength, the grade of first concentrate selection is gradually decreased, and the rate of recovery gradually increases,
Being analyzed final determining magnetic field strength is 280~350kA/m, is lower than 280kA/m, though the just high rate of recovery of the grade of concentrate selection
Index can be not achieved, be higher than 350kA/m, the rate of recovery it is up to standard but just concentrate selection grade it is low be unfavorable for subsequent technique processing, from
And final pre-selection effect is influenced, in addition, the roller attrition speed of high pressure roller mill obviously increases, roll surface when granularity is greater than 30mm
Service life reduces, and increases the operating cost of high pressure roller mill.
Further, the closed circuit dry screening system that the roller mill screening of step 3 is formed in high-pressure roller mill and high frequency micro powder screen
It is carried out in system, oversize returns to high-pressure roller mill and regrinds, and undersize enters next step.
In this programme granularity be -30mm dry type magnetic separation concentrate enter high-pressure roller mill formed with high frequency micro powder screen it is closed circuit
In dry screening system, roller mill screening is carried out, has on the one hand saved the working space of roller mill screening, closed-circuit system, which decreases, raises
Dustiness dye, and oversize can be returned in high pressure roller mill and be regrinded, and improved concentrate utilization rate, reduced capacity consumption, increase
Production efficiency.
Further, the equipment of dry screening is SELM high frequency micro powder screen.
Dry screening equipment screening frequency is high, amplitude is small, screening efficiency is high, applies under this process conditions, without using
Flushing water rinses the high efficiency that can guarantee screening function, therefore fullys meet the purpose of dry screening, so that this technique is removed
Outside wet magnetic separation, previous step accomplishes dry process and treatment effect is guaranteed.
Further, the SELM high frequency micro powder screen vibration frequency is 700~1200rpm.
This programme control SELM high frequency micro powder screen vibration frequency be 700~1200rpm, can be to this programme previous step after
Granularity reaches 90% or more in the screening efficiency of the miberal powder of -3mm after roller mill, and vibration frequency is lower than 700rpm, SELM high frequency micro mist
It is easy buildup influence production on sieve sieve to carry out, vibration frequency is higher than 1200rpm, influences little on screening efficiency and increases energy
Consumption.
Further, the midfield intensity magnetic separator is downflow type magnetic separator.
This programme carries out the wet magnetic separation of ore using downflow type magnetic separator, and downflow type magnetic separator processing capacity is big, equipment
It is at low cost, facilitate the low cost operation of this technique.
Further, the magnetic field strength of the downflow type magnetic separator is 238.85~318.47kA/m.
The concentrate slurry for being -3mm for granularity, this programme design the magnetic field strength of downflow type magnetic separator 238.85~
318.47kA/m, when magnetic field strength is lower than 238.85kA/m, the rate of recovery for tailing of dishing out is not achieved index, increase tailings glass at
Originally it results in waste of resources, magnetic field strength is higher than 318.47kA/m, and concentrate grade is lower in the concentrate slurry after magnetic separation, influences pre-selection effect
Fruit.
Concentrate slurry concentration after downflow type magnetic separator magnetic separation is not high, and the application uses the technique of grading ball milling, alleviates
The working load of ball mill, improves production efficiency.
Further, the magnetic system drift angle setting of the strong dry-type magnetic selection apparatus in midfield are as follows: 11 °~15 °；Middle field strength wet magnetic separation is set
Standby magnetic system drift angle setting are as follows: 20 °~25 °.
Applicants have found that the setting of the magnetic system drift angle of magnetic plant has different influences to the mineral grade sorted,
It being counted from practical condition, the setting of magnetic system drift angle is bigger, and the concentrate quality sorted is higher, but the rate of recovery can reduce, according to
This rule, applicant combine the process conditions of the application, to the magnetic system drift angle parameter of magnetic plant at two used in technique into
Row adaptive improvement；11 °~15 ° are set by the magnetic system drift angle of the strong dry-type magnetic selection apparatus in midfield, when the strong dry type magnetic separation in midfield
Mineral are granularity in the ore of -30mm, and particle is larger, is arranged by lesser system's magnetic declination, keep magnetic lesser particle organic
It can sort up, and barren rock mine to no avail is skimmed, the tailings grade after the strong dry type magnetic separation step in midfield is low, the rate of recovery
Height can overcome this defect by the application subsequent technique, when field strength wet magnetic separation in progress though concentrate grade at this time is lower
When, this programme control fair current magnet separator magnetic system drift angle is set as 20 °~25 °, and under this magnetic system drift angle, the concentrate quality sorted is very
Height, advantageous to final pre-selection effect, the magnetic mineral aggregate for overcoming downstream-type magnetic separator generally existing is easily lost in the defect of tailing,
And primary election step has been skimmed a part of tailing, the load difficulty of wet type fair current magnetic separation is also reduced, although through wet type fair current magnetic separation
Mining tailing rate of dishing out is lower, but up to standard when recycled in its entirety rate in the application pre-selection technique, and finally feeds one section of ball mill
Concentrate grade it is higher, the whole effect that preselects greatly promotes.
The high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the invention throws tail+high pressure roller by primary election
Wet magnetic separation throws tail+grading ball milling before grinding dry screening+mill, can throw 30% or more tail before iron ore concentrate is ground, enter to grind raw ore product
Position improves 20 percentage points or more, realizes " much broken and lessmill can throw early throwing ", is ground by the laggard horizontal high voltage roller of muck product primary election
Ultrafine grinding reduces ore grinding energy consumption；And screening is implemented using high frequency micro powder screen to the product of ultrafine grinding, fine powder mine is implemented wet under sieving
Tail is thrown in formula magnetic separation, is improved the grade into mill iron ore concentrate, is reduced subsequent ore grinding amount, then by ball milling after classification, into one
Step reduces ore grinding cost, and further simplifies process flow and operation cost, has reached energy saving, reduction is produced into
This, increases the purpose of production efficiency, and 20% or more power consumption is saved compared with conventional high pressure roller mill wet screening technique；Using this
Pre-selection technique is implemented in invention, using mine conveying facility is given under former ore grinding storehouse and ore grinding storehouse, reduces equipment investment；With the prior art
Compared to the ring water that can reduce screening operation, the Pulp pump conveying job step of rough concentrate is omitted, field strength wet magnetic separation in lower is sieved
Before operation may be arranged at one section of ball mill of main building, reduce the factory investment and production cost of pre-selection operation.This technique is special
Suitable for the old dressing plant of chromium depleted zone using the pre- ore dressing of high-pressure roller mill or the pre- ore-dressing technique of high pressure roller mill of north cold area.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, by broken, primary election throw tail,
The screening of roller mill, wet magnetic separation throw tail, grading ball milling, complete the pre-selection of chromium depleted zone stone, the step before wet magnetic separation step is equal
For dry type, saved water consumption and energy consumption, final step ensure that pre-selection effect using wet magnetic separation, and by preposition dry type at
Step is managed, concentrate slurry can flow automatically and feed in milling system after final magnetic separation, and the transmission of preposition dry process step Mineral Material can make
With the ore transmission device of plant area, the investment of plant and equipment is greatly saved, by grading ball milling, reduces ore grinding cost；
(2) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, milling system are one section of ball milling
Machine and hydrocyclone form closed circuit grinding system, and by cyclone classification, the iron ore for avoiding part from dissociating enters ball milling
It is overground caused by afterwards, the rate of recovery is improved, ore grinding cost is reduced；
(3) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, the capable and experienced formula in midfield in step 2
The magnetic field strength of magnetic separation is 280~350kA/m, and the pre-selection effect of pre-selection technique can be improved and keep recovery rate of concentrate up to standard；
(4) the roller mill screening of the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, step 3 exists
It is carried out in the closed circuit dry screening system that high-pressure roller mill is formed with high frequency micro powder screen, has on the one hand saved the work of roller mill screening
Space, closed-circuit system decreases dust pollution, and oversize can be returned in high pressure roller mill and be regrinded, and improves concentrate use
Rate reduces capacity consumption, increases production efficiency；
(5) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, the equipment of dry screening are
SELM high frequency micro powder screen, is applied under this process conditions, rinses i.e. certifiable sieve without carrying out discharging to it with discharging flushing water
Divide the high efficiency of function, therefore fullys meet the purpose of dry screening, so that this technique goes out outside middle field strength wet magnetic separation, it is preposition
Step accomplishes dry process and treatment effect is guaranteed；
(6) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention controls SELM high frequency micro powder screen
Vibration frequency is 700~1200rpm, can reach 90% or more in the screening efficiency of the miberal powder of -3mm with granularity after roller-crushing mill；
(7) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, wet magnetic separator use fair current
Formula magnetic separator, processing capacity is big, and equipment cost is low, facilitates the low cost operation of this technique；
(8) the high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone of the present invention, design downflow type magnetic separator
Concentrate grade and the rate of recovery of the magnetic field strength in 238.85~318.47kA/m, after guaranteeing magnetic separation.
Detailed description of the invention
Fig. 1 is the high pressure roller mill dry screening wet type pre-selecting process flow chart of chromium depleted zone stone of the present invention.
Specific embodiment
The present invention is further described below with attached drawing combined with specific embodiments below.
Embodiment 1
As shown in Figure 1, the chromium depleted zone stone of the present embodiment, the TFe grade of raw ore is 29.59%, Armco magnetic iron in ore
Occupation rate 68.57%, pre-selection technique are as follows:
One, it is crushed: raw ore being crushed using Three stage crushing with single closed circuit stage technique, crushed product size -30mm；
Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation is carried out using magnetic pulley equipment, magnetic field
Intensity is 280kA/m, dry type magnetic separation tailing of dishing out, and obtains dry type magnetic separation concentrate；
Three, roller mill screening: granularity carries out high-pressure roller mill in the dry type magnetic separation concentrate of -30mm and carries out ultrafine grinding, high pressure roller
The wide 1200mm of mill diameter 1900mm, roller, the closed circuit dry screening system that roll-in products application SELM43120 high frequency micro powder screen is formed
System, vibration frequency 1200rpm, screen size 3mm are sieved, and screening efficiency 93%, oversize passes through sealing-tape machine
It returns to high pressure roller mill to regrind, undersize enters wet type fair current magnetic separator；
Four, midfield high intensity magnetic separation: ore pulp is formed after -3mm miberal powder is mixed with water and is sent into field strength fair current magnetic separation in CTS-1560
Field strength wet magnetic separation in machine progress, magnetic field strength 318.47kA/m, concentrate slurry gravity flow feeds milling system after magnetic separation, and tailing is thrown
Out；
Five, grading ball milling: concentrate slurry feeds water conservancy cyclone, and the sand setting of hydrocyclone feeds one section of ball mill, and one
The ore discharge of section ball mill feeds pumping in pond to mine for one section of cyclone, and the overflow of hydrocyclone carries out subsequent grinding operation.
Wherein the magnetic system drift angle of magnetic pulley equipment is 11 °, and the magnetic system drift angle of fair current magnetic separator is 20 °.
In the present embodiment the primary election stage dish out dry type magnetic separation tailing yield be 17.34%, obtain dry type magnetic separation concentrate TFe product
Position is 33.29%, and it is 30.50% that middle field strength wet magnetic separation, which throws tail yield, concentrate grade 53.16%.
The technique of the present embodiment tailings discarding by preconcentration 47.84% before ore grinding, it is final to preselect concentrate grade 53.16%, enter mill
The grade of ore improves 23.57 percentage points, has achieved the purpose that reduce increased costs efficiency.
Embodiment 2
As shown in Figure 1, the chromium depleted zone stone of the present embodiment, the TFe grade of raw ore is 20.76%, Armco magnetic iron in ore
Occupation rate 71%, pre-selection technique are as follows:
One, it is crushed: raw ore being crushed using Three stage crushing with single closed circuit stage technique, crushed product size -30mm；
Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation is carried out using magnetic pulley equipment, magnetic field
Intensity is 280kA/m, dry type magnetic separation tailing of dishing out, and obtains dry type magnetic separation concentrate；
Three, roller mill screening: granularity carries out high-pressure roller mill in the dry type magnetic separation concentrate of -30mm and carries out ultrafine grinding, high pressure roller
The wide 1200mm of mill diameter 1500mm, roller, the closed circuit dry screening system that roll-in products application SELM3680 high frequency micro powder screen is formed
System, vibration frequency 700rpm, screen size 3mm are sieved, and screening efficiency 92%, oversize passes through sealing-tape machine
It returns to high pressure roller mill to regrind, undersize enters wet type fair current magnetic separator；
Four, midfield high intensity magnetic separation: ore pulp is formed after -3mm miberal powder is mixed with water and is sent into field strength fair current magnetic separation in CTS-1560
Field strength wet magnetic separation in machine progress, magnetic field strength 238.85kA/m, concentrate slurry gravity flow feeds milling system after magnetic separation, and tailing is thrown
Out；
Five, grading ball milling: concentrate slurry feeds water conservancy cyclone, and the sand setting of hydrocyclone feeds one section of ball mill, and one
The ore discharge of section ball mill feeds pumping in pond to mine for one section of cyclone, and the overflow of hydrocyclone carries out subsequent grinding operation.
Wherein the magnetic system drift angle of magnetic pulley equipment is 13 °, and the magnetic system drift angle of fair current magnetic separator is 22 °.
In the present embodiment the primary election stage dish out dry type magnetic separation tailing yield be 15.55%, obtain dry type magnetic separation concentrate TFe product
Position is 22.85%, and it is 32.61% that middle field strength wet magnetic separation, which throws tail yield, concentrate grade 54.26%.
The technique of the present embodiment tailings discarding by preconcentration 48.16% before ore grinding, it is final to preselect concentrate grade 54.26%, enter mill
The grade of ore improves 33.5 percentage points, has achieved the purpose that reduce increased costs efficiency.
Embodiment 3
As shown in Figure 1, the chromium depleted zone stone of the present embodiment, the TFe grade of raw ore is 20.70%, Armco magnetic iron in ore
Occupation rate 79.53%, pre-selection technique are as follows:
One, it is crushed: raw ore being crushed using Three stage crushing with single closed circuit stage technique, crushed product size -30mm；
Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation is carried out using magnetic pulley equipment, magnetic field
Intensity is 310kA/m, dry type magnetic separation tailing of dishing out, and obtains dry type magnetic separation concentrate；
Three, roller mill screening: granularity carries out high-pressure roller mill in the dry type magnetic separation concentrate of -30mm and carries out ultrafine grinding, high pressure roller
The wide 1200mm of mill diameter 1500mm, roller, the closed circuit dry screening system that roll-in products application SELM3680 high frequency micro powder screen is formed
System, vibration frequency 980rpm, screen size 3mm are sieved, and screening efficiency 92%, oversize passes through sealing-tape machine
It returns to high pressure roller mill to regrind, undersize enters wet type fair current magnetic separator；
Four, midfield high intensity magnetic separation: ore pulp is formed after -3mm miberal powder is mixed with water and is sent into field strength fair current magnetic separation in CTS-1560
Field strength wet magnetic separation in machine progress, magnetic field strength 287.39kA/m, concentrate slurry gravity flow feeds milling system after magnetic separation, and tailing is thrown
Out；
Five, grading ball milling: concentrate slurry feeds water conservancy cyclone, and the sand setting of hydrocyclone feeds one section of ball mill, and one
The ore discharge of section ball mill feeds pumping in pond to mine for one section of cyclone, and the overflow of hydrocyclone carries out subsequent grinding operation.
Wherein the magnetic system drift angle of magnetic pulley equipment is 15 °, and the magnetic system drift angle of fair current magnetic separator is 25 °.
In the present embodiment the primary election stage dish out dry type magnetic separation tailing yield be 12.37%, obtain dry type magnetic separation concentrate TFe product
Position is 25.72%, and it is 30.73% that middle field strength wet magnetic separation, which throws tail yield, concentrate grade 57.94%.
The technique of the present embodiment tailings discarding by preconcentration 43.1% before ore grinding, it is final to preselect concentrate grade 55.94%, enter mill
The grade of ore improves 35.24 percentage points, has achieved the purpose that reduce increased costs efficiency.
Embodiment 4
After the chromium depleted zone stone pre-selection technique of embodiment 1 is gone into operation, under the work condition environment of Zhang village iron ore beneficiating factory, it is contemplated that year
Economize on electricity 4,200,000 kW, year cost reduce by 4,600,000 yuan.
Example of the present invention is only that preferred embodiments of the present invention will be described, not to present inventive concept and
Range is defined, and under the premise of not departing from design philosophy of the present invention, this field engineers and technicians are to technology of the invention
The various changes and improvements that scheme is made should all fall into protection scope of the present invention.
Claims (8)
1. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone, which is characterized in that steps are as follows:
One, it is crushed: chromium depleted zone stone raw ore being crushed, crushed product size -30mm；
Two, primary election: the strong dry type magnetic separation in midfield is carried out to lower ore is sieved, dry type magnetic separation tailing of dishing out obtains dry type magnetic separation concentrate；
Three, roller mill screening: after dry type magnetic separation concentrate carries out high pressure roller mill, the miberal powder that dry screen separates granularity -3mm enters in next step
Suddenly；
Four, midfield high intensity magnetic separation: ore pulp is formed after miberal powder is mixed with water and enters midfield intensity magnetic separator wet magnetic separation, the essence after magnetic separation
Mine enters next step, and tailing is dished out；
Five, grading ball milling: the concentrate after wet magnetic separation carries out grading ball milling in milling system.
2. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 1, feature
Be: the milling system is one section of ball mill and hydrocyclone forms closed circuit grinding system, the concentrate after wet magnetic separation
Slurry gravity flow feeds cyclone in mine pump pond.
3. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 2, feature
Be: the magnetic field strength of the strong dry type magnetic separation in midfield is 280~350kA/m in step 2.
4. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 2, feature
Be: the roller mill screening of step 3 carries out in the closed circuit dry screening system that high-pressure roller mill is formed with high frequency micro powder screen, sieves
Upper product returns to high-pressure roller mill and regrinds, and undersize enters next step.
5. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 4, feature
Be: the equipment of dry screening is SELM high frequency micro powder screen.
6. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 5, feature
Be: the SELM high frequency micro powder screen vibration frequency is 700~1200rpm.
7. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 1, feature
Be: the midfield intensity magnetic separator is downflow type magnetic separator.
8. a kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone according to claim 7, feature
Be: the magnetic field strength of the downflow type magnetic separator is 238.85~318.47kA/m.
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