CN109909065A - A kind of beneficiation method of low-grade building stones screenings - Google Patents
A kind of beneficiation method of low-grade building stones screenings Download PDFInfo
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Abstract
The invention discloses a kind of beneficiation methods of low-grade building stones screenings, the described method comprises the following steps: 1) be crushed: take low-grade building stones, respectively carry out coarse crushing, in it is broken and fine crushing；2) it primary screening: is sieved using vibrating screen to by the low-grade building stones in broken underground, obtains 55mm centimeters of stones, 35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；3) dry type magnetic separation: dry type magnetic separation is carried out to screenings mountain flour using dry-type magnetic extractor, obtains concentrate and tailings；4) Re-concentration of concentrate: dry type magnetic separation concentrate elder generation's ore grinding that step (3) obtains is selected again by magnetic separation tube.Method of the invention can skim the screenings of original low-grade building stones the ore high containing Armco magnetic iron by dry type magnetic separation, and the accurate ore dressing of abandoned piles object is realized using Re-concentration of concentrate, is not only turned waste into wealth, but also mitigates environmental pressure.
Description
Technical field
The invention belongs to technical field of beneficiation, and in particular to a kind of beneficiation method of low-grade building stones screenings.
Background technique
In actual mining activity, certain low-grade barren rocks do not meet production cement, mixed mud since its bulk density is big
The ingredient requirement of equal requirements, needs the raw material from the large quantities of low bulk density of other places of origin of raw materials automotives to be matched to reach bulk density and want
It asks, greatly increases its production cost so as to cause intermediate links such as transports.In addition to this, low-grade barren rock raw material is by broken
After the processing such as screening, oversize is sorted to obtain several building materials, but screenings therein deposited into mine pond after drainage heap
Product not only occupies a large amount of storage spaces, but also also result in immense pressure to environment in open storage ground, therefore, these screenings stones
Powder is urgently to be resolved.In addition usually also containing the metal with ore dressing value in these screenings mountain flours.
In view of the above problems, a kind of method for inventing low-grade building stones screenings reduction bulk density is very important.
Summary of the invention
The purpose of the present invention is to provide a kind of methods that low-grade building stones screenings reduces bulk density.
The object of the present invention is achieved like this, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；
2) primary screening: being sieved using vibrating screen to by the low-grade building stones in broken underground, obtain 55mm centimeters of stones,
35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: using magnetic field strength be 500-700mT RTGX0405 dry-type magnetic extractor to it is obtained in step (2)-
3mm screenings mountain flour carries out dry type magnetic separation, obtains dry type magnetic separation concentrate and dry type magnetic separation tailing；The dry type magnetic separation tailing is logical
After crossing the screening of standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic separation tube is selected again, is obtained concentrate selection again and is selected tailing again.
Compared with prior art, the present invention has following technical effect that
1, the present invention is targetedly using being crushed, by the way of primary screening, dry type magnetic separation, Re-concentration of concentrate, for low-grade stone
The serious, intractable -3mm screenings mountain flour of material heap product, first carries out dry type screening appropriate, then for the concentrate of dry type magnetic separation
The method for using mill ore magnetic selection Guan Zaixuan again, so that the purpose of waste material ore dressing is effectively realized, so that metal values are able to
It is selected；Tailing waste material therein reduces bulk density using regrading simultaneously, and material can be used by also becoming building.
2, method of the invention can skim the screenings of original low-grade building stones containing Armco magnetic iron by dry type magnetic separation
High ore realizes the accurate ore dressing of abandoned piles object using Re-concentration of concentrate, not only turns waste into wealth, but also mitigates environment
Pressure.
3, the present invention greatly solves the problems, such as the stockpiling of low-grade building stones screenings, creates economic benefit.Of the invention
Implement, operational effect is safe and reliable, meets safety and environmental protection requirement.
Specific embodiment
The present invention is further illustrated below, but the present invention is limited in any way, based on the present invention
It is any made by introduction to transform or replace, it all belongs to the scope of protection of the present invention.
The beneficiation method of low-grade building stones screenings of the present invention, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；
2) primary screening: being sieved using vibrating screen to by the low-grade building stones in broken underground, obtain 55mm centimeters of stones,
35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: using magnetic field strength be 500-700mT RTGX0405 dry-type magnetic extractor to it is obtained in step (2)-
3mm screenings mountain flour carries out dry type magnetic separation, obtains dry type magnetic separation concentrate and dry type magnetic separation tailing；The dry type magnetic separation tailing is logical
After crossing the screening of standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic separation tube is selected again, is obtained concentrate selection again and is selected tailing again.
Further, the TFe grade of low-grade building stones as described in step (1) is 9.50-10.50%, and mFe grade is
2.50-4.00%。
Further, the gape adjusting range of jaw crusher as described in step (1) is 6-38mm, and installed power is
4Kw。
Further, the broken gape adjusting range with to roller division crusher is 5-15mm in as described in step (1),
Installed power is 7.5 Kw；The gape adjusting range fine crushing with to roller division crusher is 5-15mm, installed power
For 18.5 Kw.
Further, 120 ° of the Guide canel of dry-type magnetic extractor described in step (3), 115 ° of magnetic system drift angle, cylinder turn
Fast 0-90r/min.
Further, the magnetic field strength of dry-type magnetic extractor described in step (3) is 600mT.
Further, the baffle spacing of dry-type magnetic extractor described in step (3) is 4cm, linear velocity 0.5-1.5m/s.
Further, the linear velocity is 0.75m/s.
Further, the magnetic field strength of magnetic separation tube described in step (4) is 120-200mT.
Further, the magnetic field strength of magnetic separation tube described in step (4) is 170mT.
Embodiment 1
The raw material of cloud Jian Toujiasa building stones factory are supplied by Yuxi Dahongshan Mining Industry Co., Ltd. completely, for the low-grade useless of mining
Stone, since its bulk density is about 1.7t/m3Left and right, even higher, the raw material bulk density for not meeting the requirements such as production cement, mixed mud is wanted
It asks.
One, feedstock property
Cloud Jian Toujiasa building stones factory send chemical examination after dividing screenings mountain flour (- 3mm) division, drying, sample preparation, and mountain flour property is shown in Table 1.
1 cloud Jian Toujiasa building stones factory mountain flour property of table
As shown in Table 1, it is somebody's turn to do -3mm mountain flour moisture 6.66%, water content reason bigger than normal is open storage ground for its stockpiling point, and before sampling
One it rains, therefore its moisture is bigger than normal, 12.11 % of TFe grade, mFe grade 3.42%, bulk density 1.6826t/m3, dry density
1.9894t/m3。
Two, bulk density test is reduced
1, capital equipment is tested
Table 2 tests capital equipment
2, dry type magnetic separation test result 1
Mountain flour original sample sample mixing is uniform, and heap cone method is average to be respectively divided into 4 parts, standby to make condition test sample, since former wet miberal powder is due to water
It is point bigger than normal, it can not be sorted with dry-type magnetic extractor, therefore the mountain flour original sample baking oven is dried, in the condition that magnetic field strength is 1000mT
Under, dry throw is carried out with RTGX0405 dry-type magnetic extractor and is tested, and linear velocity is adjusted to maximum value, can not still sort, mountain flour almost all
Into concentrate bucket, therefore the RTGX0405 dry-type magnetic extractor of 600mT, test result such as table 3 are used in test instead.
3 mountain flour of table (dry) original sample dry type magnetic separation result of laboratory test
As shown in Table 3, the mountain flour (dry) is after dry type magnetic separation, and dry type magnetic separation effect is most under conditions of on-line velocity is 1.49m/s
Well, concentrate yield 44.36%, concentrate TFe grade 16.09%, recovery rate of concentrate 58.93% are improved compared with raw ore TFe grade
3.98 percentage points, bulk density 2.0037t/m3；Tailing yield 55.64%, tailing TFe grade 8.94%, mining tailing rate 41.07%,
Bulk density 1.9519t/m3, compared with raw ore part (dry) bulk density 1.9894t/m3Reduce 0.0375t/m3, dry type magnetic separation pre-selection is can be one
Determine the bulk density that building materials raw material is reduced in degree, effect is not significant.
3, dry type magnetic separation experimental result 2
Lithotomy powder continues to reduce revolving speed for 2 parts of the sample RTGX0405 dry-type magnetic extractors with 600mT, to increase concentrate yield, reduces
Tailing yield and TFe grade, test result are shown in Table 4.
4 mountain flour of table (dry) original sample dry type magnetic separation result of laboratory test
As shown in Table 4, the mountain flour (dry) is after dry type magnetic separation, and dry type magnetic separation effect is most under conditions of on-line velocity is 0.75m/s
Well, concentrate yield 58.57%, concentrate TFe grade 15.24%, recovery rate of concentrate 73.71% are improved compared with raw ore TFe grade
3.13 percentage point；Tailing yield 41.13%, tailing TFe grade 7.68%, mining tailing rate 26.29%, bulk density 1.71t/m3。
4, concentrate and tailings processing experiment after dry type magnetic separation
1) dry type magnetic separation tailing drop bulk density experiment
Take above-mentioned dry type magnetic separation tailing for sample X4Portion, upper standard screen jacket sieve screening, is divided into the grade of different narrow, surveys its appearance respectively
Weight, result such as the following table 5.
5 dry type magnetic separation tailing of table is for sample X4 grain size analysis bulk density test result
As shown in Table 5, after dry type magnetic separation tailing is sieved into narrower grade through bushing screen for sample X4, the bulk density of size fractionated is
It reduces, minimum bulk density is down to 1.49t/m3.In view of actual production can not assign to so narrow grade, also it is combinable at+
Three 3mm ,+0.45~-3mm, -0.045mm grade products, bulk density is respectively 1.57t/m3、1.64t/m3、1.67t/m3, accordingly
Yield be 24.13%, 34.45%, 41.42%.If being merged into+0.9 and -0.9 two grade, bulk density is respectively 1.65t/m3、
1.68t/m3, corresponding yield is 45.77%, 54.23%.According to the above experiment it is found that though the bulk density after merging slightly increases,
Substantially it can satisfy the requirement of building stones factory mixed mud supplying base aggregate.
2) dry type magnetic separation Re-concentration of concentrate is tested
Take dry type magnetic separation concentrate for two parts of sample, TFe grade is 16.09% and 18.87%, is milled to -0.074mm content respectively and accounts for
90%, magnetic separation tube test is carried out to it under the magnetic field condition of 170mT, the result is shown in tables 6.
Magnetic separation tube test result after 6 dry type magnetic separation concentrate ore grinding of table
As shown in Table 6, dry type magnetic separation concentrate dissociates iron mineral and gangue further after ore grinding, and after magnetic separation tube, concentrate is produced
Rate 10.82%, concentrate grade 63.37%, recovery rate of concentrate 42.61%, tailings grade 10.35% can using method of the invention
Concentrate selection grade again is significantly improved, is the precious metals in low-grade building stones -3mm screenings mountain flour further using providing base
Plinth.
Embodiment 2
A kind of beneficiation method of low-grade building stones screenings, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；The TFe grade of the low-grade building stones is that 9.50%, mFe grade is 2.50%.The gape of the jaw crusher
Adjusting range is 6-38mm, installed power 4Kw.The broken gape adjusting range with to roller division crusher is 5- in described
15mm, installed power are 7.5 Kw；The gape adjusting range fine crushing with to roller division crusher is 5-15mm, installation
Power is 18.5 Kw.
2) it primary screening: is sieved using vibrating screen to by the low-grade building stones in broken underground, obtains 55mm public affairs
Divide stone, 35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: -3mm obtained in step (2) is sieved using the RTGX0405 dry-type magnetic extractor that magnetic field strength is 500mT
Lower object mountain flour carries out dry type magnetic separation, 115 ° of 120 ° of the Guide canel of the dry-type magnetic extractor, magnetic system drift angle, drum speed 30r/
min.The baffle spacing of the dry-type magnetic extractor is 4cm, linear velocity 0.5m/s；Obtain dry type magnetic separation concentrate and dry type magnetic separation
Tailing；After the dry type magnetic separation tailing is sieved into 2 grades by standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic field strength is that the magnetic separation tube of 120mT is selected again, obtains concentrate selection again and selects tailing again.
Embodiment 3
A kind of beneficiation method of low-grade building stones screenings, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；The TFe grade of the low-grade building stones is that 10.50%, mFe grade is 4.00%.The ore discharge of the jaw crusher
Mouth adjusting range is 6-38mm, installed power 4Kw.The broken gape adjusting range with to roller division crusher is in described
5-15mm, installed power are 7.5 Kw；The gape adjusting range fine crushing with to roller division crusher is 5-15mm, dress
Machine power is 18.5 Kw.
2) it primary screening: is sieved using vibrating screen to by the low-grade building stones in broken underground, obtains 55mm public affairs
Divide stone, 35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: -3mm obtained in step (2) is sieved using the RTGX0405 dry-type magnetic extractor that magnetic field strength is 700mT
Lower object mountain flour carries out dry type magnetic separation, 115 ° of 120 ° of the Guide canel of the dry-type magnetic extractor, magnetic system drift angle, drum speed 90r/
min.The baffle spacing of the dry-type magnetic extractor is 4cm, linear velocity 1.5m/s；Obtain dry type magnetic separation concentrate and dry type magnetic separation
Tailing；After the dry type magnetic separation tailing is sieved into 6 grades by standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic field strength is that the magnetic separation tube of 200mT is selected again, obtains concentrate selection again and selects tailing again.
Embodiment 4
A kind of beneficiation method of low-grade building stones screenings, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；The TFe grade of the low-grade building stones is that 10%, mFe grade is 3%.The gape of the jaw crusher adjusts
Range is 6-38mm, installed power 4Kw.The broken gape adjusting range with to roller division crusher is 5- in described
15mm, installed power are 7.5 Kw；The gape adjusting range fine crushing with to roller division crusher is 5-15mm, installation
Power is 18.5 Kw.
2) it primary screening: is sieved using vibrating screen to by the low-grade building stones in broken underground, obtains 55mm public affairs
Divide stone, 35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: -3mm obtained in step (2) is sieved using the RTGX0405 dry-type magnetic extractor that magnetic field strength is 600mT
Lower object mountain flour carries out dry type magnetic separation, 115 ° of 120 ° of the Guide canel of the dry-type magnetic extractor, magnetic system drift angle, drum speed 45r/
min.The baffle spacing of the dry-type magnetic extractor is 4cm, linear velocity 0.75m/s；Obtain dry type magnetic separation concentrate and dry type magnetic
Select tailing；After the dry type magnetic separation tailing is sieved into 4 grades by standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic field strength is that the magnetic separation tube of 170mT is selected again, obtains concentrate selection again and selects tailing again.
Embodiment 5
A kind of beneficiation method of low-grade building stones screenings, comprising the following steps:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；The TFe grade of the low-grade building stones is that 10.2%, mFe grade is 3.5%.The gape of the jaw crusher
Adjusting range is 6-38mm, installed power 4Kw.The broken gape adjusting range with to roller division crusher is 5- in described
15mm, installed power are 7.5 Kw；The gape adjusting range fine crushing with to roller division crusher is 5-15mm, installation
Power is 18.5 Kw.
2) it primary screening: is sieved using vibrating screen to by the low-grade building stones in broken underground, obtains 55mm public affairs
Divide stone, 35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: -3mm obtained in step (2) is sieved using the RTGX0405 dry-type magnetic extractor that magnetic field strength is 550mT
Lower object mountain flour carries out dry type magnetic separation, 115 ° of 120 ° of the Guide canel of the dry-type magnetic extractor, magnetic system drift angle, drum speed 60r/
min.The baffle spacing of the dry-type magnetic extractor is 4cm, linear velocity 0.6m/s；Obtain dry type magnetic separation concentrate and dry type magnetic separation
Tailing；After the dry type magnetic separation tailing is sieved into 5 grades by standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic field strength is that the magnetic separation tube of 150mT is selected again, obtains concentrate selection again and selects tailing again.
Claims (10)
1. a kind of beneficiation method of low-grade building stones screenings, it is characterised in that the following steps are included:
1) be crushed: taking low-grade building stones, carry out respectively coarse crushing, in it is broken and fine crushing, specially first carried out using jaw crusher thick
It is broken, it is then broken with broken in being carried out to roller division crusher in use, finally using fine crushing fine crushing with being carried out to roller division crusher,
It is spare；
2) primary screening: being sieved using vibrating screen to by the low-grade building stones in broken underground, obtain 55mm centimeters of stones,
35mm centimeters of stones, 15mm centimeters of stones, 3mm chicken girt and -3mm screenings mountain flour；
3) dry type magnetic separation: using magnetic field strength be 500-700mT RTGX0405 dry-type magnetic extractor to it is obtained in step (2)-
3mm screenings mountain flour carries out dry type magnetic separation, obtains dry type magnetic separation concentrate and dry type magnetic separation tailing；The dry type magnetic separation tailing is logical
After crossing the screening of standard screen bushing screen, used as construction material；
4) Re-concentration of concentrate: the dry type magnetic separation concentrate elder generation ore grinding to -0.074mm content that step (3) obtains is accounted for 90%, is then used
Magnetic separation tube is selected again, is obtained concentrate selection again and is selected tailing again.
2. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that as described in step (1)
The TFe grade of low-grade building stones is 9.50-10.50%, and mFe grade is 2.50-4.00%.
3. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that as described in step (1)
The gape adjusting range of jaw crusher is 6-38mm, installed power 4Kw.
4. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that as described in step (1)
In the broken gape adjusting range with to roller division crusher be 5-15mm, installed power is 7.5 Kw；The use pair fine crushing
The gape adjusting range of roller division crusher is 5-15mm, and installed power is 18.5 Kw.
5. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that described in step (3)
115 ° of 120 ° of the Guide canel of dry-type magnetic extractor, magnetic system drift angle, drum speed 0-90r/min.
6. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that described in step (3)
The magnetic field strength of dry-type magnetic extractor is 600mT.
7. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that described in step (3)
The baffle spacing of dry-type magnetic extractor is 4cm, linear velocity 0.5-1.5m/s.
8. the beneficiation method of low-grade building stones screenings according to claim 7, it is characterised in that the linear velocity is
0.75m/s。
9. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that described in step (4)
The magnetic field strength of magnetic separation tube is 120-200mT.
10. the beneficiation method of low-grade building stones screenings according to claim 1, it is characterised in that described in step (4)
Magnetic separation tube magnetic field strength be 170mT.
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