Four-section two-closed-circuit crushing system for magnetite

Abstract

The utility model discloses a four-section two-closed-circuit crushing system for magnetite, belongs to the technical field of crushing of ore dressing plants, and solves the problems of unstable product granularity and higher ore grinding energy consumption of the conventional crushing system. The device comprises coarse crushing equipment, intermediate crushing equipment and a vibrating screen which are connected in sequence, and further comprises a surge bin, a high-pressure roller mill, a flip-flow screen and a raw fine ore bin which are connected in sequence, a screen underflow discharging port of the vibrating screen is connected with the feeding end of the surge bin, and the discharging end of the surge bin is connected with the feeding end of the high-pressure roller mill through a first conveyor; the discharging end of the high-pressure roller mill is connected with the feeding end of the flip-flow screen through a second conveyor, an undersize product discharging port of the flip-flow screen is connected with the raw fine ore bin through a third conveyor, and an oversize product discharging port of the flip-flow screen is connected to the first conveyor through a fourth conveyor. The utility model meets the energy-saving process requirement of more crushing and less grinding, the granularity of the product is stable, the power consumption and steel consumption of the grinding machine are reduced, and the purposes of reducing cost and improving efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the crushing technical field of ore dressing plant, specifically relates to a magnetite four-stage two-closed circuit crushing system. BACKGROUND

[0002] Generally speaking, the energy consumption of ore grinding accounts for more than 50% of the entire plant, and how to reduce the energy consumption of ore grinding is the key to reducing costs and increasing efficiency of the plant.

[0003] At present, the iron ore dressing plant mainly adopts a three-stage one-closed circuit crushing system, which has the problems of unstable product particle size, large circulating load, and excessive equipment load, and the subsequent ore grinding system has high energy consumption. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a magnetite four-stage two-closed circuit crushing system to solve the problems of unstable product particle size, large circulating load, excessive equipment load, and high ore grinding energy consumption of the existing crushing system.

[0005] The technical scheme of the utility model is: a magnetite four-stage two-closed circuit crushing system, which comprises coarse crushing equipment, medium crushing equipment and a vibrating screen connected in sequence, a first conveyor is connected between the discharge end of the coarse crushing equipment and the feeding end of the medium crushing equipment, a second conveyor is connected between the medium crushing equipment and the vibrating screen, the oversize material discharge port of the vibrating screen is connected to fine crushing equipment through a return material conveyor, and the discharge end of the fine crushing equipment is connected to the second conveyor; further comprising a buffer bin, a high-pressure roller mill, a tension screen and a raw ore bin connected in sequence, the undersize material discharge port of the vibrating screen is connected to the feeding end of the buffer bin through a third conveyor and a feeding conveyor, the discharge end of the buffer bin is connected to the feeding end of the high-pressure roller mill through a first conveyor, the discharge end of the high-pressure roller mill is connected to the feeding end of the tension screen through a second conveyor, the undersize material discharge port of the tension screen is connected to the raw ore bin through a third conveyor, and the oversize material discharge port of the tension screen is connected to the first conveyor through a fourth conveyor.

[0006] As a further improvement of the utility model, a vibrating feeder is arranged at the discharge end of the buffer bin.

[0007] High-pressure roller mill technology is an advanced crushing and grinding process that grinds and compacts materials between two symmetrical rollers by using high pressure. Its principle is based on two main factors: high pressure and roller gap adjustment. In the high-pressure roller mill process, the material is compacted into the roller gap between the rollers, and then subjected to high pressure for grinding. High pressure can enhance the cohesion between material particles, thereby improving the ore grinding effect.

[0008] The utility model discloses a beneficial effect is: the utility model discloses the perfect link of high pressure roller mill to the original crushing system, change the original three section one closed circuit crushing process into four section two closed circuit crushing process, increase high pressure roller mill superfine crushing operation, meet the energy -conserving process requirement of more crushing less grinding, and the final crushing product granularity reduces to 3mm from 12mm, and product granularity is stable, obviously reduces the back end ball mill grinding granularity, increases the powder amount in feeding, reduces the ore hardness, thereby reduces the ore grinding system energy consumption, and the ore grinding feeding granularity of 3mm makes the mill power consumption, steel consumption all obtain the reduction, reduces the circulation load and equipment load, reaches the purpose of reducing cost and increasing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the structural schematic diagram of the utility model;

[0010] Figure 2 It is the work flow chart of the utility model.

[0011] In the drawing: 1 - buffer bin;2 - feeding conveyor;3 - vibrating feeder;4 - first conveyor;5 - high pressure roller mill;6 - second conveyor;7 - apron screen;8 - fourth conveyor;9 - third conveyor;10 - original fine ore bin;11 - coarse crushing equipment;12 - medium crushing equipment;13 - vibrating screen;14 - three section conveyor;15 - return material conveyor;16 - fine crushing equipment;17 - one section conveyor;18 - two section conveyor. DETAILED DESCRIPTION

[0012] The utility model is in brief described below in combination with the drawings.

[0013] As Figure 1 The utility model discloses a magnetite four section two closed circuit crushing system, including coarse crushing equipment 11, medium crushing equipment 12 and vibrating screen 13 that connect gradually, and the lower end of coarse crushing equipment 11 is connected with the upper end of medium crushing equipment 12 through one section conveyor 17, and medium crushing equipment 12 is connected with vibrating screen 13 through two section conveyor 18, and the screen upper material discharge port of vibrating screen 13 is connected to fine crushing equipment 16 through return material conveyor 15, and the lower end of fine crushing equipment 16 is connected to two section conveyor 18;Its characterized in that: still including buffer bin 1, high pressure roller mill 5, apron screen 7 and original fine ore bin 10 that connect gradually, and the screen lower material discharge port of vibrating screen 13 is connected with the feeding end of buffer bin 1 through three section conveyor 14 and feeding conveyor 2, and the lower end of buffer bin 1 is connected with the upper end of high pressure roller mill 5 through first conveyor 4, and the lower end of high pressure roller mill 5 is connected with the upper end of apron screen 7 through second conveyor 6, and the screen lower material discharge port of apron screen 7 is connected with original fine ore bin 10 through third conveyor 9, and the screen upper material discharge port of apron screen 7 is connected to first conveyor 4 through fourth conveyor 8.

[0014] Vibrating feeder 3 is equipped at the lower end of buffer bin 1.

[0015] Embodiment 1,

[0016] The iron ore processing scale of an iron ore dressing plant in Xinjiang is 3 million tons per year, the original design of the crushing system is three-stage one-closed-circuit crushing, two-magnetic pulley dry separation, and the used equipment is as follows:

[0017] The coarse crushing equipment 11 is one Metso C140 jaw crusher;

[0018] The medium crushing equipment 12 is one Metso HP400 cone crusher;

[0019] The fine crushing equipment 16 is one Metso HP400 cone crusher;

[0020] The dry separation equipment is one B=1600 φ1250 permanent magnetic pulley and one B=1400 φ1250 permanent magnetic pulley.

[0021] The present reconstruction is the four-stage two-closed-circuit crushing system of the utility model, the working process is as shown in Figure 2 The raw ore is coarsely crushed by the coarse crushing equipment 11, medium crushed by the medium crushing equipment 12, and then screened by the vibrating screen 13, the undersize material is given to the buffer bin 1 through the three-stage conveyor 14 and the feeding conveyor 2, the bottom of the buffer bin 1 feeds the material to the first conveyor (B=1200) 4 through the vibrating feeder 3, the material enters the high-pressure roller mill (GM160120) 5, the center material and the edge material of the high-pressure roller mill are unloaded to the second conveyor (B=1200) 6, and then given to the flip-flow screen 7 (the screen surface is 3.5m wide and 12m long), the oversize material of the flip-flow screen 7 is given to the first conveyor 4 through the fourth conveyor (B=1000) 8 and returned to the high-pressure roller mill 5, and the undersize material of the flip-flow screen 7 is sent to the raw ore bin 10 through the third conveyor (B=1000) 9. The oversize material after screening by the vibrating screen 13 is sent to the fine crushing equipment 16 through the return conveyor 15, and after fine crushing, it is given to the vibrating screen 13 through the two-stage conveyor 18. Thus, the four-stage two-closed-circuit crushing process is formed.

[0022] The feeding conveyor 2, the first conveyor 4, the high-pressure roller mill 5, the third conveyor 9 and the fourth conveyor 8 all adopt belt conveyors.

[0023] The storage time of the buffer bin 1 is at least 2h.

[0024] The screen hole of the flip-flow screen 7 is 4×20mm, so as to maximize the crushing effect of the high-pressure roller mill. The processing capacity of the flip-flow screen 7 with the same area is about 30% higher than that of the traditional circular vibrating screen, which is the key equipment of the four-stage two-closed-circuit crushing process.

[0025] After the high-pressure roller mill is introduced, the original coarse crushing equipment, medium crushing equipment and fine crushing equipment remain unchanged, and the operation parameters are adjusted as follows:

[0026] The CSS of the jaw crusher of the coarse crushing device is enlarged to 150 mm, and the maximum discharge size is adjusted from 110 mm to 200 mm;

[0027] The operation time of the cone crusher of the medium crushing device is increased, the CSS of the discharge port is adjusted to 50 mm, and the maximum discharge size is adjusted to 100 mm;

[0028] The operation time of the cone crusher of the fine crushing device is increased, the CSS of the discharge port is adjusted to 25 mm, the maximum discharge size is adjusted to 30 mm, and the back-end vibrating screen 13 is replaced with a vibrating screen with a mesh size of 30 mm, so as to achieve the optimal feed size of 30 mm of the high-pressure roller mill 5.

[0029] After the above equipment modification, the work load is obviously reduced, the circulating load is reduced, and then the energy consumption and the steel consumption are reduced.

[0030] After the modification, due to the reduction of the feed size of the back-end ball mill, the production capacity of the original mill is increased from 500 t / h to 600 t / h, the total power consumption of the crushing device and the ball mill is reduced by about 5%, the overall lining steel consumption of the coarse crushing device, the medium crushing device and the fine crushing device is reduced by about 6%, and the steel ball and lining steel consumption of the ball mill is reduced by about 20%.

[0031] In addition, after the introduction of the high-pressure roller mill 5, the grinding fineness of the mill is increased from 55% of -200 mesh to 60% of -200 mesh, at this time, not only the concentrate quality is improved, but also the grade of the concentrate is increased by at least 1%, and the concentrate reaches the fineness requirement of long-distance pipeline transportation, further reducing the enterprise cost.

Claims

1. A magnetite four-stage two-closed-circuit crushing system, comprising coarse crushing equipment (11), medium crushing equipment (12) and a vibrating screen (13) connected in sequence, the lower discharging end of the coarse crushing equipment (11) and the upper feeding end of the medium crushing equipment (12) are connected through a first-stage conveyor (17), the medium crushing equipment (12) and the vibrating screen (13) are connected through a second-stage conveyor (18), the screen discharge port of the vibrating screen (13) is connected to fine crushing equipment (16) through a return material conveyor (15), and the lower discharging end of the fine crushing equipment (16) is connected to the second-stage conveyor (18); characterized in that: Also include the buffer bin (1) connected in turn, high pressure roller mill (5), the tension screen (7) and the raw ore bin (10), the underflow of the vibrating screen (13) is connected with the buffer bin (1) feed end through three section conveyor (14), the feeding conveyor (2), the buffer bin (1) is connected between the discharge end and the high pressure roller mill (5) feeding end through the first conveyor (4), the high pressure roller mill (5) is connected between the discharge end and the tension screen (7) feeding end through the second conveyor (6), the underflow of the tension screen (7) is connected between the discharge end and the raw ore bin (10) through the third conveyor (9), the overflow of the tension screen (7) is connected to the first conveyor (4) through the fourth conveyor (8).

2. A four-stage two-closed-circuit magnetic iron ore crushing system as claimed in claim 1, wherein: Vibration feeder (3) is arranged at the discharge end of the buffer bin (1).

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