CN110882791A - Efficient selective fine grinding process method and device for schreyerite - Google Patents
Efficient selective fine grinding process method and device for schreyerite Download PDFInfo
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- CN110882791A CN110882791A CN201911164660.2A CN201911164660A CN110882791A CN 110882791 A CN110882791 A CN 110882791A CN 201911164660 A CN201911164660 A CN 201911164660A CN 110882791 A CN110882791 A CN 110882791A
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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
- 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
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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Abstract
The invention mainly relates to the field of ferrous metal dressing and smelting process and ore grinding equipment, in particular to a high-efficiency selective fine grinding process method and device for schreyerite. Aiming at the problems that in the fine grinding process of the Panxi red lattice vanadium-titanium iron ore in the prior art, the iron ore is finely ground by the ball milling process, the titanium ore is ground to be too fine, but the fineness of the iron ore is insufficient, the technical scheme of the invention is as follows: comprises the ore grinding technological parameters of a novel vertical mill, such as grinding medium material, size, type and proportion, ore grinding concentration and ore grinding fineness; mill operating parameters such as mill speed, operating frequency, agitator type; the ore grinding process flow refers to the step of closed circuit ore grinding by vertical grinding. The method is suitable for the fine grinding process of the vanadium-titanium-iron ore.
Description
Technical Field
The invention mainly relates to the field of ferrous metal dressing and smelting process and ore grinding equipment, in particular to a high-efficiency selective fine grinding process method and device for schreyerite.
Background
Panxi red lattice vanadium-titanium iron ore belongs to refractory ore due to low grade, associated multiple metals and complex interweaving of multiple minerals. In recent years, as mining gradually goes deep, gangue is also changed from pyroxene to pyroxene and pyroxene with similar properties to vanadium-titanium iron ore, and the difficulty in obtaining qualified iron ore concentrate is increased under the existing process technical conditions. If qualified iron ore concentrate is obtained, fine grinding is needed, but the difference of the embedded granularity of the titanium mineral and the iron mineral is large, the difference of hardness and brittleness is large, the titanium mineral is easy to be ground, and fine titanium is difficult to recover.
The existing ball milling process grinds iron minerals finely, and grinds titanium minerals too finely, thereby not only wasting ore grinding energy consumption, but also greatly reducing the recovery rate of titanium. In addition, the existing ball milling process has low efficiency and poor ore grinding effect, so that the iron ore grinding fineness is insufficient, the obtained iron ore concentrate has low grade, the energy consumption is high, and the operation cost is high.
Disclosure of Invention
The invention provides a high-efficiency selective fine grinding process method and a device for schreyerite, aiming at the problems that in the fine grinding process of the Panxi red lattice schreyerite, iron minerals are finely ground by a ball milling process, and titanium minerals are ground to be too fine while the fineness of the iron minerals is insufficient in the prior art, and the method and the device are characterized in that: the method has the advantages of uniform granularity of ore grinding products, high dissociation degree, strong selective ore grinding, low energy consumption, low operation cost and good ore grinding effect, and is favorable for a novel efficient selective ore grinding process for subsequent sorting.
The technical scheme adopted by the invention is as follows:
a high-efficiency selective fine grinding process method for schreyerite comprises the following steps:
step 1: preparing ilmenite powder into slurry, and stirring in a stirring device to obtain slurried ilmenite;
step 2: grading the slurried ilmenite obtained in the step (1) by using a grading device, wherein mineral particles with large particle size enter a grinding device, and mineral particles with small particle size flow out to perform the next process;
and step 3: and (2) grinding the mineral particles with large particle size in a grinding device to obtain ground slurry, adding the ground slurry into the stirring device in the step (1), and repeating the step (1) to form a closed-loop process.
The technical scheme aims at the contradiction that the grinding fineness of titanium minerals and iron minerals in the Panxi red lattice vanadium-titanium iron ore is difficult to unify, a closed process is formed through stirring, grading and grinding, once the grinding of the minerals reaches the particle size within the target range, the minerals are separated through the grading process, and the minerals with the particle size larger than the target range continue to circulate in the closed process. Finally, the particle size of harder iron minerals can be milled to be within a target range, and the titanium minerals are separated in time after being milled, so that the condition that milling is too fine due to long-time milling is avoided. By adopting the grinding process, after the materials to be ground are ground in a closed circuit by vertical grinding and grading, the contents of coarse and fine particle grades in the ground products are low, the contents of qualified particle grades and the metal distribution rate are high, the titanium minerals are less excessively ground, and the dissociation degree of iron minerals is high.
Preferably, the milling device employs a vertical spiral agitator mill with media balls sized to 10-30mm in diameter.
Preferably, the grinding device adopts a vertical spiral stirring mill, the frequency of the vertical spiral stirring mill is set to be 30-50HZ, and the linear velocity of the edge of the vertical spiral stirring mill is 3-5 m/s.
In the preferred scheme, the size and the proportion of the selected medium balls are moderate, and the frequency and the rotating speed of the vertical spiral stirring ore mill are moderate, so that the crushing energy of the medium balls is moderate, and the process is combined into the process of the application, and can be used for grinding iron minerals quickly and avoiding the titanium minerals from being quickly ground.
More preferably, the kind of the medium ball is any one of chrome steel ball, zirconium ball, ceramic ball, glass ball or natural sand.
Media balls of the above kind are effective in grinding iron and titanium minerals.
Preferably, the classifying means is a cyclone.
The application still provides a high-efficient selectivity fine grinding device of schreyerite for above-mentioned technology, including agitating unit, grading plant and milling device, be connected with conveyer pipe I between agitating unit's the discharge gate and the feed inlet of grading plant, be connected with conveyer pipe II between grading plant's the large granule discharge gate and the feed inlet of milling device, be connected with conveyer pipe III between milling device's discharge gate and the agitating unit.
Further preferably, the stirring device is a stirring barrel or a pump pool. The agitator or pump pond mainly play pulp ore pulp effect and cushioning effect, can also can be ordinary agitated vessel or mix earth pump pond for high-efficient agitator, can store and adjust the ore pulp liquid level effect, guarantee the stability of ore grinding system ore pulp liquid level, have and stabilize mill feed effect.
Further preferably, the classifying means is a cyclone. The cyclone can effectively separate qualified grain size in time, and the circulation of the cyclone in the ore grinding grading loop is reduced.
Further preferably, the milling device is a vertical spiral stirring ore mill. The vertical mill has the function of selective fine grinding, has stronger grinding effect on coarse-grained hard minerals, has weaker grinding effect on fine-grained brittle minerals, and has strong grinding pertinence and good uniformity of ground products.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. after the materials to be ground are ground in a closed circuit by vertical grinding and grading, the contents of coarse and fine particle grades in ground ore products are low, the contents of qualified particle grades and the metal distribution rate are high, the titanium minerals are less excessively ground, and the dissociation degree of iron minerals is high.
2. The size and proportion of the selected medium balls are moderate, and the frequency and the rotating speed of the vertical spiral stirring ore mill are controlled moderately, so that the crushing energy of the medium balls is moderate.
3. Agitating unit can store and adjust the ore pulp liquid level effect, guarantees the stability of ore grinding system ore pulp liquid level, has stable mill feed effect.
4. The vertical mill has the function of selective fine grinding, has stronger grinding effect on coarse-grained hard minerals, has weaker grinding effect on fine-grained brittle minerals, and has strong grinding pertinence and good uniformity of ground products.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a high-efficiency selective fine grinding device for schreyerite in the invention.
Wherein: 1-stirring device, 2-slurry mixing water pipe, 3-new ore feeding pipe, 4-slurry pump, 5-conveying pipe I, 6-grading device, 7-conveying pipe II, 8-grinding device, 9-accident slurry discharging pipe, 10-conveying pipe III, 11-discharging pipe.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1.
A high-efficiency selective fine grinding process method for schreyerite comprises the following steps:
step 1: preparing ilmenite powder into slurry, and stirring in a stirring device to obtain slurried ilmenite;
step 2: grading the slurried ilmenite obtained in the step (1) by using a grading device, wherein mineral particles with large particle size enter a grinding device, and mineral particles with small particle size flow out to perform the next process;
and step 3: and (2) grinding the mineral particles with large particle size in a grinding device to obtain ground slurry, adding the ground slurry into the stirring device in the step (1), and repeating the step (1) to form a closed-loop process.
Preferably, the grinding device adopts a vertical spiral stirring mill, the medium size of the vertical spiral stirring mill is set to be 10-30mm in diameter, the frequency of the vertical spiral stirring mill is set to be 30-50HZ, and the edge linear velocity of the vertical spiral stirring mill is 3-5 m/s.
More preferably, the kind of the medium ball is any one of chrome steel ball, zirconium ball, ceramic ball, glass ball or natural sand.
Preferably, the classifying means is a cyclone.
The application also provides a vanadium-titanium ore efficient selective fine grinding device for the process, which comprises a stirring device 1, a grading device 6 and a grinding device 8. The stirring device 1 is provided with a slurry mixing water pipe 2 and a new ore feeding pipe 3 for water inlet and minerals. Be connected with conveyer pipe I5 between agitating unit 1's the discharge gate and the feed inlet of grading plant 6, be connected with conveyer pipe II 7 between the large granule discharge gate of grading plant 6 and the feed inlet of milling device 8, the tiny particle discharge gate of grading plant 6 is provided with discharging pipe 11. A conveying pipe III 10 is connected between the discharge port of the grinding device 8 and the stirring device 1. The milling device 8 is also provided with an emergency discharge pipe 9 for discharging the pulp in the system in special situations.
Further preferably, the stirring device 1 is a stirring barrel or a pump pool. The agitator or pump pond mainly play pulp ore pulp effect and cushioning effect, can also can be ordinary agitated vessel or mix earth pump pond for high-efficient agitator, can store and adjust the ore pulp liquid level effect, guarantee the stability of ore grinding system ore pulp liquid level, have and stabilize mill feed effect.
Further preferably, the classifying means 6 is a cyclone. The cyclone mainly separates qualified fraction in time and effectively, reduces the circulation of the qualified fraction in an ore grinding grading loop, the inner diameter of a used grading section can be phi 350 mm-phi 650mm, the material can be any one of polyurethane, rubber and ceramic lining, the fineness of a graded product can be stabilized at 50-55% of minus 75 mu m, the content of a coarse fraction of plus 0.15mm is only 3.89%, and the content of a fine fraction of minus 0.015mm is only 11.82%. As a preferred mode, be provided with sediment stuff pump 4 on the conveyer pipe I5, adopt the hose pump to carry out the ore pulp and carry, through its can be even stable pressure carry the ore pulp to advance the swirler hierarchical, guarantee the stability of feed, can be any for hose pump, centrifugal pump, ceramic pump, sediment stuff pump.
Further preferably, the milling device 8 is a vertical spiral agitator mill. The stirrer of the vertical stirring mill can be in any one of a spiral type, a rod type, a disc type and a composite type. The vertical mill has the function of selective fine grinding, has stronger grinding effect on coarse-grained hard minerals, has weaker grinding effect on fine-grained brittle minerals, and has strong grinding pertinence and good uniformity of ground products. The diameter of the grinding medium ball is 10-30mm, the material can be any one of chrome steel ball, zirconium ball, ceramic ball, glass ball or natural sand, the spiral edge speed is 3-5m/s, the grinding fineness can be stabilized at 28-32% of minus 75 μm, the content of plus 0.15mm coarse fraction is only 22.15%, and the content of minus 0.015mm fine fraction is only 4.61%.
Examples
The feed particle size of this example was 75 μm at 14.47%, +0.15mm coarse fraction at up to 66.55%, and-0.015 mm fine fraction at 3.27%.
Under the condition of closed circuit grinding process, the grinding device 8 is a vertical spiral stirring ore grinding machine. The vertical spiral stirring ore mill uses medium balls with the diameters of 12mm, 15mm and 17mm, and is matched according to the ratio of 4:4:2, the size and the proportion of the medium balls are moderate, and the crushing energy is moderate. The medium ball is chromium steel ball. The frequency of the vertical spiral stirring ore mill is 30Hz, the linear velocity of the edge of the spiral stirrer is 3m/s, and the energy of ore grinding media is proper.
The grading device 6 is a cyclone, so that the fineness of the ground ore discharged after grading reaches D50-D55 which is 75 mu m, the content of the coarse fraction with 0.15mm is only 3.89%, the content of the fine fraction with 0.015mm is only 11.82%, and the monomer dissociation degrees of ilmenite and magnetite respectively reach 85.22% and 84.13%.
Compared with the existing ore grinding process of the ball mill and the vibrating screen, the content of the final ground product with the coarse fraction of 0.15mm and the fine fraction of 0.015mm is reduced by 3.11 percentage points, the content of the qualified fraction with the size of-0.15 mm to +0.015mm and the metal distribution rate are respectively increased by 6.97 percentage points and 6.23 percentage points; the dissociation degree of the titanium mineral is improved by 1.82 percentage points, the dissociation degree of the iron mineral is improved by 3.41 percentage points, and the recovery rates of the titanium mineral and the iron mineral are respectively improved by 2.11 percentage points and 1.15 percentage points under the same sorting condition. The ground ore product has uniform granularity, high qualified grade content, high dissociation degree, strong selective grinding, low energy consumption, low operation cost and high ground ore fineness, and is beneficial to subsequent sorting.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (9)
1. A high-efficiency selective fine grinding process method for schreyerite is characterized by comprising the following steps:
step 1: preparing ilmenite powder into slurry, and stirring in a stirring device to obtain slurried ilmenite;
step 2: grading the slurried ilmenite obtained in the step (1) by using a grading device, wherein mineral particles with large particle size enter a grinding device, and mineral particles with small particle size flow out to perform the next process;
and step 3: and (2) grinding the mineral particles with large particle size in a grinding device to obtain ground slurry, adding the ground slurry into the stirring device in the step (1), and repeating the step (1) to form a closed-loop process.
2. The high-efficiency selective fine grinding process method for schreyerite according to claim 1, which is characterized in that: the grinding device adopts a vertical spiral stirring ore mill, and the size of a medium ball of the vertical spiral stirring ore mill is set to be 10-30mm in diameter.
3. The high-efficiency selective fine grinding process method for schreyerite according to claim 1, which is characterized in that: the milling device adopts a vertical spiral stirring ore mill, the frequency of the vertical spiral stirring ore mill is set to be 30-50HZ, and the edge linear velocity of the vertical spiral stirring ore mill is 3-5 m/s.
4. A high-efficiency selective fine grinding process method for schreyerite according to any one of claims 1 to 3, which is characterized in that: the medium ball is any one of chrome steel balls, zirconium balls, ceramic balls, glass balls or natural sand.
5. The high-efficiency selective fine grinding process method for schreyerite according to claim 1, which is characterized in that: the grading device is a swirler.
6. An apparatus for the efficient selective fine grinding process of schreyerite according to claim 1, which is characterized in that: including agitating unit (1), grading plant (6) and milling device (8), be connected with conveyer pipe I (5) between the discharge gate of agitating unit (1) and the feed inlet of grading plant (6), be connected with conveyer pipe II (7) between the large granule discharge gate of grading plant (6) and the feed inlet of milling device (8), be connected with conveyer pipe III (10) between the discharge gate of milling device (8) and agitating unit (1).
7. The efficient selective fine grinding device for schreyerite according to claim 6, characterized in that: the stirring device (1) is a stirring barrel or a pump pool.
8. The efficient selective fine grinding device for schreyerite according to claim 6, characterized in that: the grading device (6) is a cyclone.
9. The efficient selective fine grinding device for schreyerite according to claim 6, characterized in that: the milling device (8) is a vertical spiral stirring ore mill.
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