CN108144742A - A kind of closed circuit grinding method using combined and staged mode - Google Patents
A kind of closed circuit grinding method using combined and staged mode Download PDFInfo
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- CN108144742A CN108144742A CN201611101058.0A CN201611101058A CN108144742A CN 108144742 A CN108144742 A CN 108144742A CN 201611101058 A CN201611101058 A CN 201611101058A CN 108144742 A CN108144742 A CN 108144742A
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- grinding
- ore
- closed circuit
- combined
- pulp
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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
-
- 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
-
- 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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
Abstract
The present invention relates to mineral processing technique field, specifically a kind of closed circuit grinding method using combined and staged mode, enters ore grinding slurry and directly feeds hydrocyclone and be classified (1)；2), the hydrocyclone fine fraction overflow pulp of step (1) is transported in vibrating screen, screen size 0.23mm；3) step (2), is met into the pulp conveyings of granularity requirements to next process by vibrating screen, coarse granule returns to grinding machine with cyclone underflow and carries out ore grinding jointly on sieve；(4), the product after ore grinding feeds hydroclone classification again jointly with entering to grind raw ore, forms one section of combined and staged closed circuit grinding.The present invention improves the level of comprehensive utilization of low-grade uranium ferro-boron associated minerals while ore dressing processing cost is reduced.
Description
Technical field
The present invention relates to mineral processing technique field, specifically a kind of low-grade uranium ferro-boron using high-pressure roller mill
Associated minerals ore-dressing technique.
Background technology
Boron, the boron deposit of iron symbiosis, main ore mineral is magnetic iron ore, ludwigite, is secondly ascharite, pacifies then
Stone, ulrichile.Iron, boron, uranium are the important source materials of steel, chemical industry, the energy, but primary ore, and valuable mineral disseminated grain size is thin,
Adhesion feature is complicated, and many difficulties are caused to the comprehensive utilization of ore.
Existing ore-dressing technique is mainly using two stage grinding classification-two stages of magnetic separation technique recycling iron ore concentrate, two stages of magnetic separation synthesis
Tailing screening recycles uranium concentrate for gravity treatment after two grades, and gravity tailings utilizes hydroclone classification boron concentrate.This technique is dashed forward
Go out the problem is that ore grinding power consumption is high, beneficiation flowsheet treating capacity is low, and iron, boron monomer dissociation are insufficient, especially when raising ore dressing
During flow processing amount, grinding particle size, which is put, slightly causes magnetic tailing coarse size, and the dissociation condition of uranium is not achieved, and uranium concentrate quality is unstable
It is fixed, simultaneously because the reason of ore dilution, enter to grind raw ore boron grade and there was only 4-5%, one section of weakly magnetic tailings boron grade only has 5-
6%, it influences boron concentrate grade after being integrated with two sections of weak magnetic tails and is abandoned, cause the waste of resource.
Invention content
The purpose of the present invention is to provide a kind of low-grade uranium ferro-boron associated minerals ore-dressing technique using high-pressure roller mill, profits
With mining area ore valuable mineral iron, boron, the uranium densification symbiosis, gangue mineral and the far characteristic of the embedding company of valuable mineral,
Realize the anury ore dressing after " high pressure roller mill ultrafine grinding-discarding coarse tailing ", the intergrowth mineral for improving this type produces the comprehensive of resource
It closes using horizontal：Particle size after cracking is reduced to, while ore grindability is changed by 5-0mm by 12-0mm using high-pressure roller mill
Kind to improve grinding efficiency, most of gangue including discarding coarse tailing is abandoned containing country rock in advance is reduced into mill amount, one section of closed circuit mill
Ore mining cyclone and the stringent Control granularity of the combined and staged mode of screening machine, in conventional grinding condition next stage ore milling product
Iron, boron more preferably detach, and the boron grade of one section of weakly magnetic tailings is increased to 8-9% by 5-6% and no longer abandons, and are mixed with two sections of weakly magnetic tailings
After conjunction, the rate of recovery of final boron concentrate is improved to 47.36% to be increased substantially, while simplify gravity treatment than the 35% of the prior art
Flow without being sieved again directly using the difference of two sections of weakly magnetic tailings granularities, carries out re-selection process and can obtain uranium concentrate respectively.
The purpose of the present invention is achieved through the following technical solutions：
A kind of closed circuit grinding method using combined and staged mode, it is characterised in that：
(1), enter ore grinding slurry directly to feed hydrocyclone and be classified；It is described enter ore grinding slurry preparation method be：It will
The raw ore material of broken 12-0mm is sent into high-pressure roller mill and carries out roll-in, and the discharge of high-pressure roller mill becomes after being mixed with water
Ore pulp, the ore pulp are admitted to wet screening machine, and coarse granule is mixed with raw material on sieve is sent to the high-pressure roller mill again
Roll-in, sieving ore pulp enter ore grinding slurry for ultrafine grinding；
2), the hydrocyclone fine fraction overflow pulp of step (1) is transported in vibrating screen, screen size 0.23mm；
3) step (2), is met into the pulp conveyings of granularity requirements to next process by vibrating screen, on sieve coarse granule with
Cyclone underflow returns to grinding machine and carries out ore grinding jointly；
(4), the product after ore grinding feeds hydroclone classification again jointly with entering to grind raw ore, is formed combined and staged
One section of closed circuit grinding.
Enter ore grinding slurry mass concentration 58% described in step (1), the hydrocyclone is the cyclone group of φ 500mm × 3；
Vibrating screen described in step (2) be five highly efficient stacked screen(ing) machines, screen size 0.23mm；
Grinding machine described in step (3) is 3600 × 6000 overflowball mills.
Advantages of the present invention is with good effect：
(1), reduction ratio is moved forward and fully realizes the ore dressing principle of " much broken and lessmill " by high pressure roller mill ultrafine grinding of the invention, and
And raw material grindability after high pressure roll-in is improved, and improves the handling capacity of ore-sorting system, it is energy-saving；
(2), the most of country rock and gangue of conventional size reduction technique are avoided using ore characteristic discarding coarse tailing in the present invention
Into grinding system, meet the ore dressing principle of " early throwing can be thrown ", further reduce energy consumption, meet Green Development requirement；
(3), the present invention in one section of closed circuit grinding strictly controlled in a manner that cyclone and screening machine are combined and staged it is closed circuit
Ore milling product granularity reaches the beneficiation flowsheet of two stage grinding classification-two stages of magnetic separation iron, boron under the conditions of conventional grinding particle size and obtains
To more preferable separation；
(4), technological process of the present invention, associated resources liberation degree of minerals is high altogether, and the diboron trioxide of boron concentrate returns
It is high to receive utilization rate height, grade；
(5), technological process of the present invention, one section of weak magnetic tail and two sections of weak magnetic tail granularmetric compositions reach recycling uranium essence
The condition of ore deposit, re-selection procedure cancel sieving technology, simplify re-selection procedure, and the uranium concentrate stable quality rate of recovery improves；
(6), technological process of the present invention, mineral resources comprehensive utilization rate is high, the iron recovery of Iron concentrate
83.65%, the diboron trioxide rate of recovery reaches 47.36% in boron concentrate, and the uranium rate of recovery of uranium concentrate reaches 38.01%.
Description of the drawings
Fig. 1 is the process flow chart of invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the present invention includes the following steps：
(1), by 25.14% diboron trioxide grade of Iron grade, the 4.14% uranium grade 0.0052% of broken 12-0mm
Raw ore material be sent into high-pressure roller mill and carry out roll-in, high-pressure roller mill discharge becomes ore pulp after adding the water mixing of 2-3 times of volume,
Ore pulp is sent into wet screening machine, and coarse granule is mixed with raw material on sieve is sent to the high-pressure roller mill roll-in again, sieving ore deposit
It starches and is sent for ultrafine grinding product to subsequent processing；
(2), the ore pulp of step (1) is subjected to discarding coarse tailing magnetic separation, wherein the gangue mineral containing country rock 27.85% is as tail
Ore deposit I, the remaining magnetic concentrate I to select, magnetic concentrate I Iron grade 5.86%, loss late 6.49%；Diboron trioxide grade
1.39%, loss late 9.35%；Uranium grade 0.0033%, loss late 17.68%；The magnetic concentrate I selected enters subsequent processing；
(3), the magnetic concentrate I that step (2) is selected is subjected to an ore grinding, control output production by one section of closed circuit grinding system
- 74 μm of the granularity of product, content 50-55% (by weight, similarly hereinafter)；
(4), step (3) products obtained therefrom is subjected to a low intensity magnetic separation, obtains magnetic concentrate II and tailing II, the magnetic concentrate II
Into two sections of closed circuit grinding flows, the tailing II is recycled into fine sand re-selection procedure, and it is 0.1082% to obtain uranium grade, the rate of recovery
23.92% uranium concentrate I；
(5), it is magnetic concentrate II obtained by step (4) is levigate by two sections of closed circuit grinding systems, control the granularities of output products-
74 μm of contents 90%；
(6), it is step (5) products obtained therefrom progress weak magnetic is selected, magnetic concentrate III and tailing III are obtained, the magnetic concentrate III passes through
Filter output boracic Iron concentrate, Iron grade 58-60%, more than 83% rate of recovery；
(7), the tailing III is 0.1109% into thin mud re-selection procedure recycling uranium grade, and the rate of recovery is 17.74% uranium essence
Ore deposit II, uranium concentrate I and uranium concentrate II merge into uranium concentrate III to Mill, 0.1092% overall recovery of uranium grade
38.01%,；
(8), by the tailing II and tailing III of step (4) and step (6) respectively through gravity treatment recycle uranium concentrate after, gravity tailings
Merge be sent into next procedure cyclone take off it is thick after, then high gradient vertical-ring magnetic separator is except iron is boron concentrate, diboron trioxide
11.47% rate of recovery 47.36% of grade.
In the present embodiment：
High-pressure roller mill unit type used is GM160-140 in step (1), particle size after cracking is reduced to by-10mm to 0-
5mm to 0, the screening machine I be five highly efficient stacked screen(ing) machines, the ore pulp mass concentration 40-45%；
Ore pulp carries out discarding coarse tailing magnetic separation, the Wet-type permanent magnet drum type using Wet-type permanent magnet drum type magnetic separator in step (2)
Magnetic separator uses downstream-type trough, magnetic induction intensity 0.5T；
One section of closed circuit grinding system described in step (3) includes grinding machine I, and hydraulic cyclone is utilized after material input grinding machine ore grinding
Device is classified, and the hydraulic classiciation is known in the art technology, and cyclone overflow fine fraction product feeds five highly efficient stacked screen(ing) machines II,
Coarse granule returns to grinding machine with cyclone underflow coarse granule and regrinds on sieve, meets particle under the sieve of output products requirement and is directly entered step
Suddenly one section of low intensity magnetic separation process of (4), the grinding machine I are overflowball mill.
One section of low intensity magnetic separation in step (4) using Wet-type permanent magnet drum type magnetic separator, adopt by the Wet-type permanent magnet drum type magnetic separator
With half adverse current type trough, magnetic induction intensity 0.13T；
Two sections of closed circuit grinding systems described in step (5) include grinding machine II and screening machine III, wherein sieving meets output production
The particle of product requirement enters step two sections of low intensity magnetic separation processes in (6), and unsifted remainder particulate is sent to the grinding machine II and regrinded,
The grinding machine II is overflowball mill, and the screening machine III is four layers of electromagnetic high frequency vibrating screen.
Two sections of low intensity magnetic separations are using double roller Wet-type permanent magnet drum type magnetic separator, the double roller Wet-type permanent magnet drum type magnetic in step (6)
Selecting machine, magnetic induction intensity is respectively 0.115T and 0.165T using half adverse current type trough；
For tailing in step (4) and (6) using reselection modes, this is known in the art technology；
Boron concentrate iron removal step in step (8) uses high gradient vertical-ring magnetic separator, improves boron concentrate grade 1%, described
High gradient vertical-ring magnetic separator is diameter 2.5m, background lectromagnetism field 0.6T；
Cyclone, which takes off, in step (8) is slightly known in the art technology.
In the present embodiment, the ore pulp is transmitted by quarrel stock pump and pipeline.
The present invention is in R＆D process, and by carrying out high pressure roller mill ultrafine grinding experiment, ultrafine grinding product is tried with respect to grindability
It tests, discarding coarse tailing magnetic separation experiment, magnetic concentrate stage grinding and stage separation one, Secondary grinding mill ability match test etc. are to above-mentioned step after discarding coarse tailing
Rapid effect is verified.
Compliance test result is carried out to above-mentioned steps below by way of experiment.
1st, fractional analysis before and after high pressure roller mill：
2nd, opposite grindability contrast test before and after high pressure roller mill：
Under equal ore grinding experimental condition, in newborn -74 μm of grain size contents 95%, the time used in ultrafine grinding product is than super
Preceding raw ore fine crushing is short, and opposite to be easier to grind, ratio is：
K=9.7/12.1=0.802
3rd, discarding coarse tailing magnetic separation index is as shown in the table：
4th, one, two section of closed circuit grinding system capability match test of stage grinding and stage separation.
In the prior art, single series ore-dressing technique raw ore processing capacity 140t/h, primary grinding Grading Overflow pass through magnetic
After choosing, -74 μm of contents of material 33.63% of two sections of closed circuit grindings, final -74 μm of contents of iron ore concentrate 81.25% are fed.The present invention
By carrying out discarding coarse tailing, ore grinding experiment etc. to high pressure roller mill superfine-material, finally one, secondary grinding load is matched such as again
Under：Single series ore-dressing technique processing capacity is increased to 181.51t/h, one section of closed circuit grinding product -74 μm of content after magnetic separation
45.71%, final -74 μm of contents of iron ore concentrate 90.89%.
Claims (4)
- A kind of 1. closed circuit grinding method using combined and staged mode, it is characterised in that：(1), enter ore grinding slurry directly to feed hydrocyclone and be classified；It is described enter ore grinding slurry preparation method be：It will be broken The raw ore material of 12-0mm afterwards is sent into high-pressure roller mill and carries out roll-in, the discharge of high-pressure roller mill mixed with water after as ore deposit Slurry, the ore pulp are admitted to wet screening machine, and coarse granule is mixed with raw material on sieve is sent to the high-pressure roller mill roller again Pressure, sieving ore pulp enter ore grinding slurry for ultrafine grinding；2), the hydrocyclone fine fraction overflow pulp of step (1) is transported in vibrating screen, screen size 0.23mm；3) step (2), is met into the pulp conveyings of granularity requirements to next process by vibrating screen, coarse granule and eddy flow on sieve Device underflow returns to grinding machine and carries out ore grinding jointly；(4), the product after ore grinding feeds hydroclone classification again jointly with entering to grind raw ore, forms combined and staged one section Closed circuit grinding.
- 2. the closed circuit grinding method according to claim 1 using combined and staged mode, it is characterised in that：In step (1) It is described enter ore grinding slurry mass concentration 58%, the hydrocyclone is the cyclone group of φ 500mm × 3.
- 3. the closed circuit grinding method according to claim 1 using combined and staged mode, it is characterised in that：In step (2) The vibrating screen be five highly efficient stacked screen(ing) machines, screen size 0.23mm.
- 4. the closed circuit grinding method according to claim 1 using combined and staged mode, it is characterised in that：In step (3) The grinding machine is 3600 × 6000 overflowball mills.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101058.0A CN108144742B (en) | 2016-12-05 | 2016-12-05 | Beneficiation process method for low-grade uranium, boron and iron associated ore by adopting high-pressure roller mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101058.0A CN108144742B (en) | 2016-12-05 | 2016-12-05 | Beneficiation process method for low-grade uranium, boron and iron associated ore by adopting high-pressure roller mill |
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| CN108144742A true CN108144742A (en) | 2018-06-12 |
| CN108144742B CN108144742B (en) | 2020-08-14 |
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| CN201611101058.0A Active CN108144742B (en) | 2016-12-05 | 2016-12-05 | Beneficiation process method for low-grade uranium, boron and iron associated ore by adopting high-pressure roller mill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109201286A (en) * | 2018-11-19 | 2019-01-15 | 洛阳栾川钼业集团股份有限公司 | A kind of grind grading method improving molybdenum ore treating capacity |
| CN109550566A (en) * | 2018-10-29 | 2019-04-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | It is a kind of to reduce ore grinding energy consumption, reducing the grinding process crushed |
| CN111437972A (en) * | 2020-04-15 | 2020-07-24 | 首钢京唐钢铁联合有限责任公司 | Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109550566A (en) * | 2018-10-29 | 2019-04-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | It is a kind of to reduce ore grinding energy consumption, reducing the grinding process crushed |
| CN109201286A (en) * | 2018-11-19 | 2019-01-15 | 洛阳栾川钼业集团股份有限公司 | A kind of grind grading method improving molybdenum ore treating capacity |
| CN111437972A (en) * | 2020-04-15 | 2020-07-24 | 首钢京唐钢铁联合有限责任公司 | Ore dressing and fine grinding process and system for oxidized ore and fine ground ore powder |
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