Efficient grading system suitable for gold ore dressing

Abstract

The utility model relates to the technical field of efficient grading of gold ore dressing, and discloses an efficient grading system suitable for gold ore dressing, which comprises an ore mill, a mill ore discharge pump pool, a first slurry pump, an ore pulp distributor, a plurality of high-frequency vibrating screens, an oversize product pump pool and a second slurry pump, a discharging port of the ore mill is connected to a feeding port of the mill ore discharging pump pool through a pipeline, and the input end of the first slurry pump is connected with a discharging port of the mill ore discharging pump pool. By utilizing the characteristics of high vibration frequency and low amplitude of the high-frequency vibrating screen, the high-frequency vibrating screen is high in working efficiency, high in excitation frequency and high in screening efficiency by applying the resonance principle, is particularly suitable for grading fine-grain materials with high yield on the screen, and is high in grading efficiency due to the fact that the high-frequency vibrating screen is strictly graded according to the geometric dimension of the materials. By introducing the high-frequency fine screen in the grading process, accurate grading can be realized, so that size fraction mismatch caused by a dense medium effect in the grading process of the cyclone is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to gold ore dressing high -efficient classification technical field especially relates to a kind of high -efficient classification system suitable for gold ore dressing. BACKGROUND

[0002] The mainstream classification equipment used in current gold ore dressing plant is mainly cyclone and spiral classifier.The basic principle of cyclone classification is to realize the classification of material by using centrifugal force,when material enters rotating chamber through feed inlet,under the action of powerful centrifugal force,material with relatively coarse granularity moves to outer wall,while material with relatively fine granularity moves to center.Thus,material with different granularity is layered in rotating chamber,coarse material is intercepted by classification mechanism when moving to outer wall,while fine material continues to move to center region,then is discharged through discharge port.Because the density of gold ore is higher,leading to the large difference between gold-bearing mineral and gangue mineral,when using cyclone to classify,phenomenon of "heavy medium effect" occurs,leading to part of light gangue-containing intergrowth mineral passing through overflow of cyclone,while fine heavy gold-bearing mineral returns to mill for regrinding;In addition,restricted by cyclone structure,cyclone is difficult to realize accurate and efficient classification,its classification efficiency is generally about 45%-60%.

[0003] For gold ore dressing,low classification efficiency and heavy medium effect lead to the following three problems,which restricts ore dressing production.

[0004] I.Part of gold-containing intergrowth enters classification product,not only reduces the dissociation degree of gold-bearing mineral,also produces more coarse particles,which affects ore dressing recovery rate;

[0005] II.Already dissociated gold ore enters return sand,returns to mill for regrinding,leading to serious overgrinding-pulverization phenomenon,which affects gold ore recovery rate;

[0006] III.Lower classification efficiency leads to too large grinding-return sand ratio,which reduces ore dressing system ore processing capacity. UTILITY MODEL CONTENT

[0007] The utility model aims at solving the shortcomings in prior art,proposes a kind of high -efficient classification system suitable for gold ore dressing.

[0008] To achieve the above object, the utility model adopts the following technical scheme:

[0009] The utility model relates to a kind of high-efficiency classification system suitable for gold ore dressing, including ore mill, mill ore pump pool, first slurry pump, pulp distributor, several high-frequency vibration screens, screen product pump pool and second slurry pump, the discharge outlet of the ore mill is connected to the feed inlet of mill ore pump pool by pipeline, the input end of first slurry pump is connected to the discharge outlet of mill ore pump pool, and the output end is connected to the feed inlet of pulp distributor, the several discharge outlets of pulp distributor are respectively connected to the feed inlet of several high-frequency vibration screens, the screen product of high-frequency vibration screen is transported to the feed inlet of screen product pump pool by pipeline, the input end of second slurry pump is connected to the discharge outlet of screen product pump pool, and the output end is connected to the feed inlet of ore mill.

[0010] As a further scheme of the utility model, the high-efficiency classification system is also suitable for the scene that the height difference of site is large, can realize the efficient classification and cyclic treatment of ore, under the condition that the height difference of site is sufficient, the screen discharge outlet of high-frequency vibration screen is directly transported to the feed inlet of ore mill by pipeline through gravity, without setting screen product pump pool and second slurry pump.

[0011] As a further scheme of the utility model, the number of high-frequency vibration screen is 1-8, the number of screen mesh of high-frequency vibration screen is 1-8, the vibration frequency of high-frequency vibration screen is 1100-1800 times / min, and the screen hole size of screen mesh of high-frequency vibration screen is between 0.045mm-0.20mm according to actual demand.

[0012] As a further scheme of the utility model, when the number of high-frequency vibration screen is 1, pulp distributor does not need to be set, and the output pipe of first slurry pump is directly connected to the feed inlet of high-frequency vibration screen.

[0013] As a further scheme of the utility model, the ore mill can be overflow type ball mill, lattice type ball mill, rod mill, gravel mill or autogenous mill, and the mass of solid ore in ore mill accounts for 55%-85% of the total mass of ore and water, and the mass of water is the sum of water content in classified sand return and additional water.

[0014] As a further scheme of the utility model, the rotation speed of mill barrel of ore mill is 8r / min-55r / min, and when ore mill is autogenous mill, the preferred filling rate of grinding medium is 20%-35%.

[0015] Compared with prior art, the utility model has the beneficial effects that:

[0016] By using the high vibration frequency and low amplitude characteristics of the high frequency vibrating screen, the working efficiency is high, a higher exciting frequency is taken, the principle of resonance is applied, the screening efficiency is high, and the high frequency vibrating screen is particularly suitable for grading of fine particle materials with high yield on the screen. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A system block structure schematic diagram of the efficient grading system suitable for gold ore dressing is provided for the utility model;

[0018] Figure 2 A system block structure schematic diagram of the efficient grading system suitable for gold ore dressing is provided for the utility model;

[0019] Figure 3 A system block structure schematic diagram of the efficient grading system suitable for gold ore dressing is provided for the utility model;

[0020] Figure 4 A system block structure schematic diagram of the efficient grading system suitable for gold ore dressing is provided for the utility model;

[0021] In the drawings:

[0022] 1, ore mill; 2, mill ore pump pool; 3, first slurry pump; 4, ore slurry distributor; 5, high frequency vibrating screen; 6, screen product pump pool; 7, second slurry pump. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described in combination with specific embodiments.

[0024] In the description of the utility model, it should be pointed out that the directions or position relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "another end" and the like are the directions or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "is provided with", "connection" and the like, should do broad sense understanding, for example "connection", can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0026] As Figures 1-4 The utility model discloses a kind of high-efficiency classification systems suitable for gold ore dressing, including ore mill 1, mill ore pump pool 2, first slurry pump 3, ore pulp distributor 4, several high-frequency vibrating screen 5, screen product pump pool 6 and second slurry pump 7, the discharge outlet of the ore mill 1 is connected to the feed inlet of mill ore pump pool 2 by pipeline, the input end of first slurry pump 3 is connected with the discharge outlet of mill ore pump pool 2, and the output end is connected with the feed inlet of ore pulp distributor 4, and the several discharge outlets of ore pulp distributor 4 are respectively connected to the feed inlet of several high-frequency vibrating screen 5, and the screen product of high-frequency vibrating screen 5 is transported to the feed inlet of screen product pump pool 6 by pipeline, the input end of second slurry pump 7 is connected the discharge outlet of screen product pump pool 6, and the output end is connected the feed inlet of ore mill 1, by the way, the ore to be ground enters ore mill 1 through the feed inlet of ore mill 1 and is ground to a certain fineness, and then the ore pulp enters mill ore pump pool 2 through the discharge outlet of ore mill 1, the ore pulp in mill ore pump pool 2 is transported to ore pulp distributor 4 by first slurry pump 3, and the ore pulp is evenly distributed to 2-8 high-frequency vibrating screen 5 by entering ore pulp distributor 4, and the particles in the ore pulp are screened according to the screen size of high-frequency vibrating screen 5, and the coarse particles with excessive size cannot pass through the screen hole and remain on the screen, enter screen product pump pool 6 through the screen outlet of high-frequency vibrating screen 5, and the ore pulp in screen product pump pool 6 is transported to the feed inlet of ore mill 1 by second slurry pump 7, so that the ore pulp returns to ore mill 1 for regrinding, and the particles with qualified size pass through the screen hole of high-frequency vibrating screen 5 and enter the screen under, and are discharged through the screen outlet, and enter the next step of separation operation, by using the characteristics of high-frequency vibrating screen 5, such as high vibration frequency and low amplitude, high efficiency, high excitation frequency, and resonance principle, high screening efficiency, especially suitable for the classification of fine particle material with high screen yield, and because it is strictly classified according to the geometric size of the material, by introducing high-frequency fine screen in the classification process, accurate classification can be realized, so that the particle size mismatch caused by "heavy medium effect" in the classification process of cyclone is avoided.

[0027] As Figures 2-4As shown, in the embodiment, the high-efficiency grading system is also applicable to the scene with large height difference, and can realize efficient grading and recycling of the ore. When the site has sufficient height difference, the screen discharge port of the high-frequency vibrating screen 5 is directly conveyed to the feed port of the ore mill 1 through a pipeline by gravity, without the need to set the screen product pump pool 6 and the second slurry pump 7. By arranging the high-efficiency grading system in the scene with large height difference, the screen product pump pool 6 and the second slurry pump 7 can be omitted, the system structure is simplified, and the cost is reduced.

[0028] As shown in Figures 2-4 In the embodiment, the number of the high-frequency vibrating screen 5 is 1-8, the number of the screen mesh layer of the high-frequency vibrating screen 5 is 1-8, the vibration frequency of the high-frequency vibrating screen 5 is 1100-1800 times / min, and the screen hole size of the screen mesh of the high-frequency vibrating screen 5 is between 0.045 mm and 0.20 mm according to actual demand. By setting the number, the number of screen mesh layers, the vibration frequency and the screen hole of the high-frequency vibrating screen 5, the efficient grading system can be applied to the grading treatment of various ore particle sizes.

[0029] As shown in Figures 2-4 In the embodiment, when the number of the high-frequency vibrating screen 5 is 1, the ore slurry distributor 4 is not needed to be set, and the output pipe of the first slurry pump 3 is directly connected to the feed port of the high-frequency vibrating screen 5. By not setting the ore slurry distributor 4 when the number of the high-frequency vibrating screen 5 is 1, and directly connecting the output pipe of the first slurry pump 3 to the feed port of the high-frequency vibrating screen 5, the system structure can be further simplified, and the cost is reduced.

[0030] As shown in Figures 2-4As shown, in this embodiment, the ore mill 1 can be an overflow ball mill, a grate ball mill, a rod mill, a pebble mill, or an autogenous mill. The solid ore mass in the ore mill 1 accounts for 55%-85% of the total mass of ore and water. The mass of water is the sum of the water content in the graded return sand and the added water. The use of an overflow ball mill, grate ball mill, rod mill, pebble mill, or autogenous mill 1 increases the system's applicability. The 55%-85% solid ore mass in the ore mill 1 ensures the grinding effect of the ore mill 1. When the particle size of the ore to be ground is 13mm, the fineness after grinding by the ball mill 1 is 0.074mm, accounting for 23.15%. The number of high-frequency vibrating screens 5 is set to 3, the screen mesh of the high-frequency vibrating screens 5 is set to a 5-layer structure, and the screen aperture size is set to 0.18mm. After classification, the classification efficiency increased from 48.19% to 78.10% and the classification quality efficiency increased from 38.59% to 63.65%, while the circulating load decreased from 559.54% to 335.42%. When the particle size of the ore to be ground is 10mm, the fineness after grinding by ball mill 1 is 0.074mm, accounting for 17.81%. Two high-frequency vibrating screens 5 are set, with a 5-layer screen structure and a screen aperture size of 0.20mm. After classification, the classification efficiency increased from 63.61% to 78.90% and the classification quality efficiency increased from 49.42% to 61.90%, while the circulating load decreased from 330.08% to 256.87%. The improved classification efficiency and reduced circulating load significantly improved the system's processing capacity.

[0031] like Figures 2-4 As shown, in this embodiment, the mill cylinder rotation speed of the ore mill 1 is 8 r / min-55 r / min. When the ore mill 1 is an autogenous mill, the grinding media filling rate is preferably 20%-35%. By utilizing the high vibration frequency and low amplitude characteristics of the high-frequency vibrating screen 5, the working efficiency is high. By adopting a higher excitation frequency and applying the principle of resonance, the screening efficiency is high, which is particularly suitable for the classification of fine materials with high oversize yield. Furthermore, because it strictly classifies according to the geometric size of the material, by introducing a high-frequency fine screen in the classification process, accurate classification can be achieved, thereby avoiding particle size mismatch caused by the "heavy media effect" in the hydrocyclone classification process.

[0032] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: in use, the ore to be ground enters the ore mill 1 through the feed inlet of the ore mill 1 and is ground to a certain fineness, then the ore pulp enters the mill ore discharge pump pool 2 through the discharge outlet of the ore mill 1, the ore pulp in the mill ore discharge pump pool 2 is conveyed to the ore pulp distributor 4 through the first slag slurry pump 3, the ore pulp is evenly distributed to 2-8 high-frequency vibrating screens 5 after entering the ore pulp distributor 4, the particles in the ore pulp are screened according to the screen hole size of the high-frequency vibrating screen 5, the coarse particles with a particle size too large to pass through the screen hole remain on the screen, enter the screen product pump pool 6 through the screen discharge outlet of the high-frequency vibrating screen 5, the ore pulp in the screen product pump pool 6 is conveyed to the feed inlet of the ore mill 1 through the second slag slurry pump 7, so that the ore pulp returns to the ore mill 1 for regrinding, and the particles with a qualified particle size pass through the screen hole of the high-frequency vibrating screen 5 to enter the undersize, are discharged through the undersize discharge outlet and enter the next step of sorting operation.

[0033] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A high-efficiency classification system suitable for gold ore beneficiation, comprising an ore mill (1), a mill discharge pump pool (2), a first slurry pump (3), a slurry distributor (4), several high-frequency vibrating screens (5), an oversize product pump pool (6), and a second slurry pump (7), characterized in that, The discharge port of the ore mill (1) is connected to the inlet of the mill discharge pump pool (2) through a pipeline. The input end of the first slurry pump (3) is connected to the discharge port of the mill discharge pump pool (2), and the output end is connected to the inlet of the slurry distributor (4). Several discharge ports of the slurry distributor (4) are respectively connected to the inlets of several high-frequency vibrating screens (5). The oversize product of the high-frequency vibrating screen (5) is transported to the inlet of the oversize product pump pool (6) through a pipeline. The input end of the second slurry pump (7) is connected to the discharge port of the oversize product pump pool (6), and the output end is connected to the inlet of the ore mill (1).

2. The efficient classification system for gold ore beneficiation according to claim 1, characterized in that, The high-efficiency grading system is also suitable for scenarios with elevation differences, enabling efficient grading and recycling of ore. When the site has sufficient elevation differences, the discharge port of the high-frequency vibrating screen (5) is directly transported to the feed port of the ore mill (1) by gravity through a pipeline, without the need to set up an over-screen product pump pool (6) and a second slurry pump (7).

3. The efficient classification system for gold ore beneficiation according to claim 2, characterized in that, The number of high-frequency vibrating screens (5) is 1-8, the number of screen layers of the high-frequency vibrating screen (5) is 1-8, the vibration frequency of the high-frequency vibrating screen (5) is 1100-1800 times / minute, and the screen hole size of the high-frequency vibrating screen (5) is between 0.045mm and 0.20mm according to actual needs.

4. The efficient classification system for gold ore beneficiation according to claim 3, characterized in that, When the number of the high-frequency vibrating screen (5) is 1, the slurry distributor (4) does not need to be set up, and the output pipe of the first slurry pump (3) is directly connected to the feed port of the high-frequency vibrating screen (5).

5. A high-efficiency classification system suitable for gold ore beneficiation according to claim 4, characterized in that, The ore mill (1) is an overflow ball mill, a grate ball mill, a rod mill, a pebble mill, or an autogenous mill.

6. The efficient classification system for gold ore beneficiation according to claim 5, characterized in that, The mill cylinder rotation speed of the ore mill (1) is 8r / min-55r / min. When the ore mill (1) is an autogenous mill, the grinding media filling rate is 20%-35%.

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