CN107812590A - Selective dissociation strengthening separation method for fine particles difficult to separate - Google Patents
Selective dissociation strengthening separation method for fine particles difficult to separate Download PDFInfo
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- CN107812590A CN107812590A CN201610823194.4A CN201610823194A CN107812590A CN 107812590 A CN107812590 A CN 107812590A CN 201610823194 A CN201610823194 A CN 201610823194A CN 107812590 A CN107812590 A CN 107812590A
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- selective dissociation
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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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
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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
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
Abstract
The invention relates to a selective dissociation strengthening separation method for fine-grained refractory ore dressing, which comprises the following steps: 1) carrying out coarse grinding on the raw ore by using a ball mill or a rod mill; 2) pre-classifying products with the granularity of-0.15 mm, and performing sanding operation; 3) sanding by a sand mill to obtain a product with the grain size of-0.074 mm and the content of more than 90 percent; the mass ratio of the particle size of each medium in the sand mill is 2.0mm to 2.5mm to 3.0mm to 4.0mm to 5.0mm, namely 2-3: 1-2: 0-1.5; 4) and (4) sorting the products after sanding treatment to obtain concentrate. The beneficiation method of the invention achieves the effect of selective dissociation, realizes the narrow-level distribution of the ground ore products, is beneficial to improving the monomer dissociation degree of useful minerals, strengthens the separation effect of the minerals and greatly reduces the energy consumption.
Description
Technical field
The invention belongs to technical field of beneficiation, and in particular to a kind of beneficiation method of selective dissociation intensified sorting, especially
Suitable for the method for the selective dissociation intensified sorting of particulate difficulty ore dressing.
Background technology
Traditional beneficiation method carries out fine grinding using conventional bead mill and Vertical Mill technology to tcrude ore mostly, then again to thin
Product after mill selects row flotation, so as to obtain required concentrate.Ground by carrying out a large amount of fine grindings to conventional bead mill and Vertical Mill technology
Study carefully work, as a result find, using ball mill and Vertical Mill technology to reach corresponding mog power consumption and steel ball consumption it is non-
Chang Gao, and the degree of dissociation of ore milling product is low, grain class distribution is wide, in follow-up flotation operation often difficulty it is very big, it is necessary to using
Multistage flotation operation and the substantial amounts of floating agent of use, cause economic benefit very low.Moreover, traditional ball mill or vertical mill are all
It is that medium is done using steel ball, but iron caused by the consumption of steel ball can pollute mineral surfaces, make so as to deteriorate the flotation after fine grinding
Industry, influence of the iron caused by multistage fine grinding to flotation generally can all offset benefit caused by the increase of liberation degree of minerals, special
It is not that caused energy consumption and flotation cost can greatly increase when mog is less than 0.045mm.Because ore grinding produces
The size distribution of product is uneven, to obtain preferable concentrate product, generally require fine grinding repeatedly and multistage flotation；In addition, irony
Medium ore grinding easily makes mineral particle surface form precipitated metal and iron hydroxide film, so as to influence the floatability of mineral and choosing
Selecting property, the suitable rate of recovery is such as obtained, then the increase that floating agent will be caused to consume, further increase production cost.
In the prior art in order to reduce to raw ore carry out fine grinding power consumption and steel ball consumption caused by iron to flotation not
Profit influences, and most of particle diameter to ore grinding is only to be milled to regular particle size, and tends to rely on flotation separation operation, is floated by multistage
Technological process is selected so as to obtain qualified concentrate.But this ore-dressing technique flotation efficiency is low, ore product into flotation flowsheet
Low, the mineral product wider distribution in position, can not ensure the thorough dissociation of ore body；And the tediously long complexity of flotation flowsheet, cause floating agent
Dosage is big, and production cost is high, difficult management.Such as a kind of difficultly-selected copper zinc sulphur ore deposit referred in patent CN 101585017A
Beneficiation method, after exactly accounting for 60%-70% product less than 0.074mm to raw ore ore grinding to fineness, floated by the mixing of complexity
Technique is selected, adds substantial amounts of flotation agent, is then scanned by one roughing, triple cleaning and three times, then carry out ore grinding and obtain
Qualified concentrate product.Although this method can reduce energy consumption to a certain extent, enter the mineral granularity distribution width of flotation,
The liberation degree of minerals of mineral is low, and the separating effect of mineral is poor.
Agitator mill is as a kind of efficient, energy-conservation fine grinding and the scattered machinery of superfine grinding, because it possesses the unit interval
Interior material handling capacity is big, is a kind of efficient, energy-conservation fine grinding and ultra-fine pulverizing equipment, compared with traditional horizontal ball mill, has
Grinding efficiency is high, technique is simple, product granularity is thin and is evenly distributed, low power consumption and other advantages, has at present in ultra-fine grinding industry
Irreplaceable position, is widely applied in ore dressing field.Agitator mill is mainly by cylinder, agitating device, biography
Dynamic device and frame are formed, and by the rotation of agitating shaft, the milling medium (conventional steel ball) and material that are filled in agitation cylinder, are made
It makees multidimensional shuttling movement and spinning motion in cylinder.Its operation principle is to utilize to expect that pump will pass through the pre-dispersed wetting of mixer
In solid-liquid phase mixed material input grinding cylinder after processing, disperser rotation and abrasive media at a high speed are driven using agitating shaft
Relative motion occurs with material, the disperser agitation that the abrasive media in material and grinding cylinder is rotated at a high speed together, so as to
The solia particle in material and abrasive media is produced stronger collision, friction, shear action each other, reach quickening mill
The purpose of fine particles and disperse agglomerations, the filtered circle of material after grinding distribution is separated by filtration abrasive media, from discharging opening stream
Go out.
In recent years, with the continuous consumption of free-milling ore resource, mineral resources generally tend to be poor, thin, miscellaneous, how effectively real
The problem of now utilization of difficult ore dressing are increasingly paid attention to as ore dressing field.The agitator mill that can be suitably used for ore grinding field is big
Use Horizontal stirring grinding machine more, its on Mining Market due to use common circular millstone, and media separation system only with
Simple mesh structure, cause generally existing inner cylinder serious wear, mineral grain in the grinding process to complicated difficult ore dressing industry
The very low many defects of separator, grinding efficiency are easily blocked with spherical medium, and because most of agitator mills are all to use steel
Ball does medium, can pollute mineral surfaces because the consumption of steel ball produces Fe in grinding operation, easily form mineral particle surface
Precipitated metal and Fe (OH)3Film, so as to influence the flotation operation and selectivity of mineral after fine grinding, therefore it is difficult in ore grinding field
It is widely applied, most of ore-dressing practice is also intended to carry out ore dressing using ball mill or rod mill.
At present, there is an urgent need to propose it is a kind of can effectively using agitator mill to the ore dressing of particulate difficulty carry out ore grinding sorting it is new
Method, the narrow rank distribution of ore milling product to particulate refractory ore can be efficiently realized, improve the liberation degree of minerals of refractory minerals,
The effect of intensified sorting is played, while and can is greatly lowered what conventional bead mill or rod mill were brought when handling refractory minerals
Huge ore grinding energy consumption.
The content of the invention
The purpose of the present invention is exactly in order to solve the above-mentioned technical problem, and to provide a kind of selective dissociation of particulate difficulty ore dressing
The beneficiation method of intensified sorting, this method realize the selective dissociation to particulate refractory minerals, the ore grinding production of acquisition well
The narrow particle size distribution of product, the selective dissociation degree of mineral is high, enters separation operation by the product after fine grinding of the present invention, can
Strengthen the separating effect of mineral, while ore grinding energy consumption caused by fine grinding sorting is greatly lowered in and can.
In order to achieve the above object, the technical solution adopted by the present invention is that a kind of selective dissociation of particulate difficulty ore dressing is strong
Change the beneficiation method of sorting, comprise the following steps：
(1) roughly grind：Including being roughly ground to tcrude ore, it is -0.074mm to obtain granularity, and weight percentage accounts for tcrude ore
Gross weight 50%-70% product；
(2) pre-classification：Including carrying out pre-classification to step (1) gains, the product that granularity is -0.15mm is classified out
Sanding operation is carried out, granularity is the roughing operations of+0.15mm product return to step (1)；
(3) it is sanded：Use sand mill that the granularity that step (2) is classified out is sanded for -0.15mm product, contained
The grade measured up to more than 90% is -0.074mm product；The media particle size of the sand mill is 2.0mm~5.0mm, various grains
The mass of medium accounting of level is 2.0mm:2.5mm:3.0mm:4.0mm:5.0mm=2~3:2~3:1~2:1~2:0~1.5；
(4) sort：Step (3) products obtained therefrom is carried out to follow-up sorting mineral operation, obtains concentrate；The separation operation
Magnetic separation, gravity treatment and flotation including routine etc..
The present invention uses stage beneficiation method, and by selecting the grade of sand mill medium, the particle diameter of medium is 2.0mm
, as shown in the embodiment of the invention, can be well by selecting the different quality accounting of each grade in medium between~5.0mm
The fine grinding sorting to tcrude ore is realized, serves the effect of selective dissociation, realizes the narrow rank distribution of mineral grade, and is carried
The high liberation degree of minerals of mineral.The accounting of different size mediums can be selected according to the embedding cloth characteristic of different ores, so as to
Corresponding mineral grain narrow ditribution is realized, improves degree of dissociation of mineral monomer.
Sand mill (i.e. agitator mill) is widely used in the chemical industry such as titanium dioxide, coating field at home at present, is used for
Do Ultrafine Grinding and prepare micro-, nano level industrial chemicals.Inventor is applied on Mining Market, makes full use of ore Minerals
Structural property difference between interface and different minerals, by being matched to the selectivity of each grade quality of medium, realize well
The selective dissociation of mineral grain, the production for being -0.074mm by the grade of the content that obtains to sanding operation up to more than 90%
Product are detected, it is found that the grain class distribution of ore milling product is narrow, and distribution is mostly focused between -0.074mm~+0.019mm, very well
Ground realizes the narrow rank distribution of ore milling product, and improves the liberation degree of minerals of mineral, and reinforcing can be played to separation operation
Effect, reduces follow-up sorting mineral difficulty and the usage amount of floatation process Chinese medicine.
In addition, using the beneficiation method of the present invention, the energy consumption in grinding process substantially reduces, with traditional ball milling or rod milling
Technology is compared, and energy consumption is reduced up to more than 30%.
The beneficiation method of the present invention, by carrying out pre-classification to corase grind product, the purpose of pre-classification be with " it is early to receive,
Early lose " academic thought for instruct, traditional Continuous Grinding is replaced using Stage grinding separation technology.Through production practices table for many years
It is bright, in, during poor value exploitation utilization, using Stage grinding separation technology, ensure mineral compared with coarse fraction condition as far as possible
Under sorted, can effectively reduce ore grinding inventory, reduce ore grinding energy consumption, reach the purpose for increasing income, increasing economic efficiency.
Further, the pre-classification of the step (2), in addition to：The product for being -0.15mm to the granularity being classified out enters
Pre-sorting of row, the enriched substance after Pre-sorting is obtained, then gained enriched substance is carried out to the sanding operation of step (3).Carry out pre-
The purpose of sorting is to try to ensure that mineral are sorted under the conditions of compared with coarse fraction, can be according to different mineral using corresponding
Pre-sorting technique, gravity separation technology is such as taken in advance to certain gold ore, obtain the enriched substance after gravity treatment, then enter back into sand milling behaviour
Make, can effectively reduce ore grinding inventory in sand grinding process, further reduce energy consumption, reach the mesh for increasing income, increasing economic efficiency
's.
Further, the step (1) also include to after corase grind the product carry out step low intensity magnetic separation, obtain mine tailing and
After rough concentrate, the pre-classification described in step (2) is carried out to the rough concentrate and is operated.
Further, the corase grind in the step (1) is to carry out one section or two sections corase grind using ball mill or rod mill.
Further, the sand mill in the step (3) is Horizontal stirring grinding machine, and the medium of the Horizontal stirring grinding machine is
Inert ball medium, the inert ball medium are included in zirconium silicate, carborundum, stainless shot, bead, ceramic bead or quartz sand
It is a kind of.The mineral particle surface of steel ball institute band can be avoided using well using inertia milling medium using Horizontal stirring grinding machine
The defects of forming precipitated metal and iron hydroxide film, the floatability and selectivity of mineral are not interfered with, be more beneficial for follow-up floating
It is elected to be industry.
Further, the mesh size of the Horizontal stirring grinding machine is 0.2mm-1.0mm, suitable for being required on Mining Market
Discharging-material size.
Further, the abrasive disk of the Horizontal stirring grinding machine is circular millstone or knuckle-tooth mill, preferably knuckle-tooth mill.
The advantages of circular millstone possesses grinding efficiency height, and grinding effect is good；Knuckle-tooth mill is itself to be radially arranged U in circular millstone
Type grooving, U-shaped grooving can be multiple, and the grinding efficiency of ore can be at utmost improved using the knuckle-tooth mill, lifts useful ore deposit
The liberation degree of minerals of thing.
By the design to U-shaped grooving on abrasive disk, be advantageous to the scattered of sand grinding process chats composition granule, and during because rotating
The motion effect of abrasive disk so that slurry can produce very big direction of advance (tangentially side when leaving the U-shaped flank of tooth of mill
To) speed, this speed will synthesize oblique speed with slurry in the axial velocity that the U-shaped grooving of mill is reflected again,
This oblique speed arrives at after the working face of mill the back rotation in groove, switchs to axial direction again after the non-working surface of through mill
Into in the U-shaped grooving of mill, so circulate and produce defibrination repeatedly, so as to lift the liberation degree of minerals of mineral grain, carry
High grinding efficiency.Such a effect is confirmed by largely practice.When U-shaped grooving size design is moderate, its effect is especially aobvious
Write, because Radial Flow of the slurry in groove is made slurry in teeth groove by certain resistance, resistance after increasing in the case
Interior radial flow speed reduces, therefore the circulating pulp grinding number between dynamic and static mill can accordingly increase, and is advantageous to improve mineral grain
Liberation degree of minerals.The design of other U-shaped grooving is also advantageous to the beating degree for improving slurry.
Further, the discharging opening of the Horizontal stirring grinding machine is downward, due to the present invention mineral grade be mostly focused on-
Between 0.074mm~+0.019mm, therefore the upward design of Horizontal stirring grinding machine discharging opening is changed to that downwards, material can be avoided
Block, be advantageous to the discharging of ore pulp.
The beneficial effects of the present invention are：Present invention utilizes structural between ore Minerals interface and different minerals
Matter difference, by distributing the selectivity of each grade quality of sand mill medium, and traditional company is substituted using stage grinding technique
Continuous grinding process, has reached the effect of selective dissociation, realizes the narrow rank distribution of ore milling product, is advantageous to improve useful ore deposit
The liberation degree of minerals of thing, it is convenient to carry out follow-up separation operation, and considerably reduce energy consumption.The beneficiation method of the present invention is special
It is adapted to particulate difficulty ore dressing of the mineral disseminated grain size below 50 μm, such as Pb-Zn deposits, flaky graphite ore deposit and vanadium titano-magnetite are thin
The ore grinding sorting of the difficult ore dressing of grain.
Brief description of the drawings
Fig. 1 is the process chart one of the present invention；
Fig. 2 is the process chart two of the present invention；
Fig. 3 is the knuckle-tooth mill structural representation of the present invention；
Wherein, 1 marked in Fig. 3 is circular millstone, and 2 be U-shaped grooving.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments to the present invention
It is specifically described, it is necessary to, it is noted that following examples are used only for that the present invention is explained and illustrated, be not used to
Limit the present invention.Some nonessential modifications and adaptations that those skilled in the art are made according to foregoing invention content, still belong to
In protection scope of the present invention.
Following embodiment Minerals contents are weight percentage, i.e., the mineral of corresponding grade account for the weight hundred of total mineral
Divide ratio, -0.15mm is the ore milling product that granularity is less than or equal to 0.15mm, and+0.15mm is the ore grinding that granularity is more than 0.15mm
Product, remaining granularity is by this division.
Embodiment 1
For certain primary lead-zinc sulfide ore, its mineral disseminated grain size is fine, and the disseminated grain size of galena and zincblende all exists
45 μm or so, for Fig. 1, specific ore-dressing technique is as follows for the technological process used：
(1) roughly grind：One section of corase grind is carried out to tcrude ore using ball mill, it is -0.074mm to obtain granularity, content 50%
Product；
(2) pre-classification：Pre-classification is carried out to step (1) gains, the product that granularity is -0.15mm is classified out and carries out
Sanding operation, granularity are the roughing operations of+0.15mm product return to step (1)；
(3) it is sanded：Step (2) gains are sanded using Horizontal stirring grinding machine, obtain content up to 90% grade
For -0.074mm product；
(4) sort：Step (3) products obtained therefrom is subjected to follow-up sorting mineral operation, separation operation according to common process,
Obtain concentrate.
Wherein, the medium of Horizontal stirring grinding machine is zirconium silicate in step (3), and media particle size is 2.0mm~5.0mm, various
The mass of medium accounting of grade is 2.0mm:2.5mm:3.0mm:4.0mm:5.0mm=2:2:1:1:1, mesh size 0.2mm,
Abrasive disk uses circular millstone, and the discharging opening of Horizontal stirring grinding machine is downward.
Embodiment 2
For certain graphite ore, its mineral disseminated grain size is fine, and the disseminated grain size of flaky graphite ore deposit is adopted all at 20 μm or so
Technological process is Fig. 1, and specific ore-dressing technique is as follows：
(1) roughly grind：Two sections of corase grind are carried out to tcrude ore using rod mill, it is -0.074mm to obtain granularity, content 70%
Product；
(2) pre-classification：Pre-classification is carried out to step (1) gains, the product that granularity is -0.15mm is classified out and carries out
Sanding operation, granularity are the roughing operations of+0.15mm product return to step (1)；
(3) it is sanded：Step (2) gains are sanded using Horizontal stirring grinding machine, obtain content up to 93% grade
For -0.074mm product；
(4) sort：Step (3) products obtained therefrom is subjected to follow-up sorting mineral operation, separation operation according to common process,
Obtain concentrate.
Wherein, the medium of Horizontal stirring grinding machine is carborundum in step (3), and media particle size is 2.0mm~4.0mm, various
The mass of medium accounting of grade is 2.0mm:2.5mm:3.0mm:4.0mm=2.5:2:1.5:1.5, mesh size 0.6mm, grind
Mill uses circular millstone, and the discharging opening of Horizontal stirring grinding machine is downward.
Embodiment 3
For the Panxi Diqu v-ti magnetite ore that raw ore TFe grades are 22.85%, its mineral disseminated grain size is 40
μm or so, for Fig. 2, specific ore-dressing technique is as follows for the technological process used：
(1) roughly grind：Two sections of corase grind are carried out to tcrude ore using rod mill, it is -0.074mm to obtain granularity, content 60%
Product；Into products obtained therefrom plus water is sized mixing, and obtains ore pulp, then carries out step low intensity magnetic separation to gained ore pulp, and magnetic field intensity is
119KA/m, obtain mine tailing and rough concentrate；
(2) pre-classification：Pre-classification is carried out to the rough concentrate of step (1), the product that granularity is -0.15mm is classified out and enters
Row Pre-sorting operates, and granularity is the roughing operations of+0.15mm product return to step (1)；
(3) Pre-sorting：The product that the granularity being classified out in step (2) is -0.15mm is subjected to a Pre-sorting, obtained pre-
Enriched substance after sorting；
(4) it is sanded：Step (3) gains are sanded using Horizontal stirring grinding machine, obtain content up to 95% grade
For -0.074mm product；
(5) sort：Step (4) products obtained therefrom is subjected to follow-up sorting mineral operation, separation operation according to common process,
Obtain concentrate.
Wherein, the medium of Horizontal stirring grinding machine is quartz sand in step (4), and media particle size is 2.0mm~5.0mm, various
The mass of medium accounting of grade is 2.0mm:2.5mm:3.0mm:4.0mm:5.0mm=3:3:2:2:1.5, mesh size is
1.0mm, abrasive disk use circular millstone, and the discharging opening of Horizontal stirring grinding machine is downward.
The yield of final gained iron ore concentrate is that 68.06%, TFe grades are that 53.56%, the TFe rate of recovery reaches after after testing
87.60%.
Embodiment 4
For certain primary lead-zinc sulfide ore, its mineral disseminated grain size is fine, and the disseminated grain size of galena and zincblende all exists
30 μm or so, grinding process uses knuckle-tooth mill according to embodiment 1, the simply abrasive disk of the Horizontal stirring grinding machine in step (3),
Knuckle-tooth mill itself has been radially arranged U-shaped grooving in circular millstone.
Embodiment 5
For certain graphite ore, its mineral disseminated grain size is fine, and the disseminated grain size of flaky graphite ore deposit is all at 25 μm or so, mill
Miner's skill simply increases a Pre-sorting, the operation of Pre-sorting is according to embodiment 2 between step (2) and step (3)：Will step
Suddenly the product that the granularity that (2) are classified out is -0.15mm carries out a Pre-sorting, obtains the enriched substance after Pre-sorting, then by gained
Enriched substance carries out the sanding operation of step (3).
Wherein, the medium of Horizontal stirring grinding machine is ceramic bead, and media particle size is 2.0mm~5.0mm, the medium of various grades
Quality accounting is 2.0mm:2.5mm:3.0mm:4.0mm:5.0mm=3:2.5:2:1.5:1, mesh size 0.8mm, abrasive disk
Using circular millstone, the discharging opening of Horizontal stirring grinding machine is downward.
Comparative example 1
According to the method for embodiment 1, reached except ore grinding to product content is carried out using traditional ball mill in step (3)
90%, grade is -0.074mm, and the medium of ball mill uses steel ball, and ore grinding spherical medium quality proportioning is according to optimal proportioning：
Φ20mm:Φ10mm:Φ 5mm=20%:30%:50%, remaining step is consistent with embodiment 1.
Comparative example 2
According to the method for embodiment 1, reached except ore grinding to product content is carried out using traditional rod mill in step (3)
92%, grade is -0.074mm, and rod mill media particle size is used uniformly 3.0mm, and remaining step is consistent with embodiment 1.
Comparative example 3
According to the method for embodiment 2, reached except ore grinding to product content is carried out using traditional ball mill in step (3)
93%, grade is -0.074mm, and the medium of ball mill uses steel ball, and ore grinding spherical medium quality is according to optimal proportioning：Proportioning
For Φ 20mm:Φ10mm:Φ 5mm=20%:50%:30%, abrasive disk is common circular millstone, remaining step and embodiment
1 is consistent.
Test case 1
To grain class distribution (%), the liberation degree of minerals of products obtained therefrom after being sanded in embodiment 1-5 and comparative example 1-3
(%) is measured, and measurement result is as shown in table 1：
Table 1
As it can be seen from table 1 the grain of mineral mineral compared with traditional ball milling or rod milling obtained by 1-5 of the embodiment of the present invention
Level narrowly distributing, more than 80% is distributed in -0.074mm~+0.019mm scopes, and sanding operation effectively increases the monomer of mineral
Degree of dissociation, grinding efficiency are higher.Using traditional ball milling, the grain class distribution of mineral is wide, and liberation degree of minerals is low.
Test case 2
Ore grinding power consumption in embodiment 1-5 and comparative example 1-3 is measured, acquired results are as shown in table 2：
Table 2
From table 2 it can be seen that the ore-dressing technique of the present invention, reduces the energy consumption during ball milling or rod milling, energy well
Consumption decreases by more than 30%.
Claims (10)
1. a kind of beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing, it is characterised in that methods described is included such as
Lower step：
(1) roughly grind：Including being roughly ground to tcrude ore, it is -0.074mm to obtain granularity, and weight percentage accounts for tcrude ore gross weight
The product of amount 50%~70%；
(2) pre-classification：Including carrying out pre-classification to step (1) gains, it is classified out the product that granularity is -0.15mm and carries out
Sanding operation, granularity are the roughing operations of+0.15mm product return to step (1)；
(3) it is sanded：Use sand mill that the granularity that step (2) is classified out is sanded for -0.15mm product, obtain content and reach
More than 90% grade is -0.074mm product；The media particle size of the sand mill is 2.0mm~5.0mm, various grades
Mass of medium accounting is 2.0mm:2.5mm:3.0mm:4.0mm:5.0mm=2~3:2~3:1~2:1~2:0~1.5；
(4) sort：Step (3) products obtained therefrom is carried out to follow-up sorting mineral operation, obtains concentrate.
2. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 1, it is characterised in that
The pre-classification of the step (2), in addition to：The product for being -0.15mm to the granularity being classified out carries out a Pre-sorting, obtains
Enriched substance after Pre-sorting, then the sanding operation by gained enriched substance progress step (3).
3. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 1, it is characterised in that
The step (1) also includes carrying out step low intensity magnetic separation to the product after corase grind, after obtaining mine tailing and rough concentrate, to described thick
Concentrate carries out the pre-classification described in step (2).
4. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 1, it is characterised in that
Corase grind in the step (1) is to carry out one section or two sections corase grind using ball mill or rod mill.
5. the beneficiation method of the selective dissociation intensified sorting of the particulate difficulty ore dressing according to claim any one of 1-4, its
It is characterised by, the sand mill in the step (3) is Horizontal stirring grinding machine.
6. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 5, it is characterised in that
The medium of the Horizontal stirring grinding machine is inert ball medium, the inert ball medium include zirconium silicate, carborundum, stainless shot,
One kind in bead, ceramic bead or quartz sand.
7. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 5, it is characterised in that
The mesh size of the Horizontal stirring grinding machine is 0.2mm-1.0mm.
8. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 5, it is characterised in that
The abrasive disk of the Horizontal stirring grinding machine is circular millstone or knuckle-tooth mill.
9. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 8, it is characterised in that
The abrasive disk of the Horizontal stirring grinding machine is knuckle-tooth mill.
10. the beneficiation method of the selective dissociation intensified sorting of particulate difficulty ore dressing according to claim 5, its feature exist
In the discharging opening of the Horizontal stirring grinding machine is downward.
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