Large-granularity return mine screening and recycling system

Abstract

The utility model discloses a large-granularity return mine screening and recycling system which comprises a return mine main belt conveyor, a return mine bin, a first vibrating screen, a bucket elevator and a second vibrating screen, an inlet of the first vibrating screen is communicated with the discharging end of the return mine main belt conveyor, and an oversize product outlet of the first vibrating screen is communicated with a bottom inlet of the bucket elevator. An undersize product outlet of the first vibrating screen is communicated with an inlet of the ore return bin, a top outlet of the bucket elevator is communicated with an inlet of the second vibrating screen, an oversize product outlet of the second vibrating screen is communicated with an inlet of the blast furnace top, and an undersize product outlet of the second vibrating screen is communicated with an inlet of the ore return bin. The device has the advantages that the two groups of vibrating screens are arranged, so that the undersize materials smaller than 3mm in the return mine and the materials smaller than 3mm generated after crushing is inevitably generated in the belt running and unloading process can be recycled, and the materials with small granularity in the large-granularity screened return mine are reduced, so that the gas utilization rate of the blast furnace is improved, the fuel consumption of the blast furnace is reduced, and the energy consumption of the blast furnace is reduced. The cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace return ore, in particular to a large-size return ore screening and recovery system. Background Art

[0002] Blast furnace return ore is the screened material after screening before entering the blast furnace raw material trough. Due to its small particle size, about 40-60% of it is less than 3mm. If it enters the material batch, it will cause the porosity of the material column to decrease, seriously affecting the permeability of the blast furnace and cannot be used. It can only be returned to the sintering process as a sintering raw material. Since about 6-15% of the return ore has a particle size ≥5mm, this part can be directly used in blast furnace production. If it is used as a sintering raw material, it will cause a waste of this part of the raw material. The existing technology usually does not screen the above-mentioned blast furnace return ore. Utility Model Content

[0003] The utility model aims to provide a large-particle return ore screening and recovery system, which can respectively recover large-particle and small-particle return ore for blast furnace production or as sintering raw materials, thereby reducing waste.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A large-particle return ore screening and recovery system, characterized in that it includes a return ore main belt conveyor, a return ore bin, a first vibrating screen, a bucket elevator and a second vibrating screen, the inlet of the first vibrating screen is connected to the discharge end of the return ore main belt conveyor, the overscreen outlet of the first vibrating screen is connected to the bottom inlet of the bucket elevator, the underscreen outlet of the first vibrating screen is connected to the inlet of the return ore bin, the top outlet of the bucket elevator is connected to the inlet of the second vibrating screen, the overscreen outlet of the second vibrating screen is connected to the inlet of the blast furnace top, and the underscreen outlet of the second vibrating screen is connected to the inlet of the return ore bin.

[0006] Preferably, a three-way distributor is also arranged between the return ore main belt conveyor and the entrance of the first vibrating screen, the entrance of the three-way distributor is connected to the discharge end of the return ore main belt conveyor, one of the discharge ports of the three-way distributor is connected to the entrance of the first vibrating screen, and the other discharge port of the three-way distributor is connected to the entrance of the return ore bin.

[0007] Preferably, a recovery belt conveyor is provided at the entrance of the return ore bin, and the other discharge port of the three-way distributor and the undersize material outlet of the first vibrating screen are both connected to the feed end of the recovery belt conveyor.

[0008] Preferably, an intermediate belt conveyor is provided at the bottom entrance of the bucket elevator, the feeding end of the intermediate belt conveyor is connected to the screen material outlet of the first vibrating screen, and the discharging end of the intermediate belt conveyor is connected to the bottom entrance of the bucket elevator.

[0009] Preferably, a large-particle return ore bin is provided between the top outlet of the bucket elevator and the second vibrating screen, the inlet of the large-particle return ore bin is connected to the top outlet of the bucket elevator, and the outlet of the large-particle return ore bin is connected to the inlet of the second vibrating screen.

[0010] Preferably, the outlet of the screened material of the second vibrating screen is also connected to a weighing hopper, and a main ore belt is provided at the discharge port below the weighing hopper, and the discharge port of the main ore belt is connected to the entrance of the blast furnace roof.

[0011] Preferably, the outlet of the undersize material of the second vibrating screen is also connected to a secondary belt conveyor for returning ore, and the outlet end of the secondary belt conveyor for returning ore is connected to the inlet of a three-way distributor.

[0012] Preferably, the first vibrating screen and the second vibrating screen are both polyurethane vibrating screens with a mesh size of 3 mm.

[0013] To sum up, the beneficial effects of the utility model are as follows: the utility model can recover the undersize materials smaller than 3 mm in the returned ore and the materials smaller than 3 mm that are inevitably crushed during the belt operation and unloading process by arranging two groups of vibrating screens, and use them as sintering raw materials, thereby reducing the materials with smaller particle sizes in the returned ore after large-particle screening, and reducing the impact on the subsequent blast furnace permeability, thereby improving the utilization rate of blast furnace gas, reducing blast furnace fuel consumption, and effectively reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] In the figure, 1 is the main belt conveyor for return ore, 2 is the first vibrating screen, 3 is the intermediate belt conveyor, 4 is the bucket elevator, 5 is the large-particle return ore material, 6 is the second vibrating screen, 7 is the weighing bucket, 8 is the main ore belt, 9 is the recovery belt conveyor, 10 is the return ore bin, 11 is the three-way distributor, and 12 is the return ore auxiliary belt conveyor. DETAILED DESCRIPTION

[0016] In order to elaborate on the technical scheme adopted by the utility model to achieve the predetermined technical purpose, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a partial embodiment of the utility model, not all of the embodiments, and the technical means or technical features in the embodiment of the utility model can be replaced without paying creative labor. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0017] like Figure 1A large-particle return ore screening and recovery system shown in the figure includes a return ore main belt conveyor 1, a return ore bin 10, a first vibrating screen 2, a bucket elevator 4 and a second vibrating screen 6, the inlet of the first vibrating screen 2 is connected to the discharge end of the return ore main belt conveyor 1, the overscreen outlet of the first vibrating screen 2 is connected to the bottom inlet of the bucket elevator 4, the underscreen outlet of the first vibrating screen 2 is connected to the inlet of the return ore bin 10, the top outlet of the bucket elevator 4 is connected to the inlet of the second vibrating screen 6, the overscreen outlet of the second vibrating screen 6 is connected to the inlet of the blast furnace top, and the underscreen outlet of the second vibrating screen 6 is connected to the inlet of the return ore bin 10.

[0018] A three-way distributor 11 is also arranged between the return ore main belt conveyor 1 and the entrance of the first vibrating screen 2. The entrance of the three-way distributor 11 is connected to the discharge end of the return ore main belt conveyor 1, one of the discharge ports of the three-way distributor 11 is connected to the entrance of the first vibrating screen 2, and the other discharge port of the three-way distributor 11 is connected to the entrance of the return ore bin 10.

[0019] A recovery belt conveyor 9 is provided at the entrance of the return ore bin 10 , and the other discharge port of the three-way distributor 11 and the undersize outlet of the first vibrating screen 2 are both connected to the feed end of the recovery belt conveyor 9 .

[0020] An intermediate belt conveyor 3 is provided at the bottom entrance of the bucket elevator 4 , the feeding end of the intermediate belt conveyor 3 is connected to the screen material outlet of the first vibrating screen 2 , and the discharging end of the intermediate belt conveyor 3 is connected to the bottom entrance of the bucket elevator 4 .

[0021] A large-particle return ore bin 5 is arranged between the top outlet of the bucket elevator 4 and the second vibrating screen 6 , the inlet of the large-particle return ore bin 5 is connected to the top outlet of the bucket elevator 4 , and the outlet of the large-particle return ore bin 5 is connected to the inlet of the second vibrating screen 6 .

[0022] The outlet of the second vibrating screen 6 for the screened material is also connected to a weighing bucket 7, and a main ore belt 8 is provided at the outlet below the weighing bucket 7, and the outlet of the main ore belt 8 is connected to the entrance of the blast furnace roof.

[0023] The outlet of the undersize material of the second vibrating screen 6 is also connected to a secondary belt conveyor 12 for returning ore, and the outlet end of the secondary belt conveyor 12 is connected to the inlet of the three-way distributor 11.

[0024] The first vibrating screen 2 and the second vibrating screen 6 are both polyurethane vibrating screens with a mesh size of 3 mm.

[0025] The working process of the utility model is as follows: a three-way distributor 11 and a first vibrating screen 2 are added behind the main belt conveyor 1 for the return ore; the return ore passes through the three-way distributor 11 and enters the first vibrating screen 2 for primary screening; the large-particle return ore on the screen enters the bucket elevator 4 via the intermediate belt conveyor 3, and then enters the large-particle return ore bin 5 for storage; the large-particle return ore bin 5 is screened for the second time by the second vibrating screen 6, and then is weighed by the weighing bucket 7 and discharged to the main ore belt 8, and finally enters the blast furnace top through the material car or the main feeding belt; the small-particle return ore under the first vibrating screen 2 and the second vibrating screen 6 is transported to the return ore bin 10 for sintering via the recovery belt conveyor 9.

[0026] The utility model can recover the undersize materials smaller than 3mm in the returned ore and the materials smaller than 3mm that are inevitably broken during the belt operation and unloading process by arranging two groups of vibrating screens as sintering raw materials, reduce the materials with smaller particle sizes in the returned ore after large-size screening, reduce the influence on the subsequent blast furnace permeability, thereby improving the utilization rate of blast furnace gas, reducing blast furnace fuel consumption, and effectively reducing costs.

[0027] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A large-size ore return screening and recovery system, characterized in that: It includes a main belt conveyor for returning ore, a returning ore bin, a first vibrating screen, a bucket elevator and a second vibrating screen, wherein the inlet of the first vibrating screen is connected to the discharging end of the main belt conveyor for returning ore, the outlet for screened material of the first vibrating screen is connected to the bottom inlet of the bucket elevator, the outlet for screened material of the first vibrating screen is connected to the inlet of the returning ore bin, the top outlet of the bucket elevator is connected to the inlet of the second vibrating screen, the outlet for screened material of the second vibrating screen is connected to the inlet of the blast furnace top, and the outlet for screened material of the second vibrating screen is connected to the inlet of the returning ore bin.

2. A large-size ore screening and recovery system according to claim 1, characterized in that: A three-way distributor is also arranged between the return ore main belt conveyor and the entrance of the first vibrating screen, the entrance of the three-way distributor is connected to the discharge end of the return ore main belt conveyor, one of the discharge ports of the three-way distributor is connected to the entrance of the first vibrating screen, and the other discharge port of the three-way distributor is connected to the entrance of the return ore bin.

3. A large-size ore screening and recovery system according to claim 2, characterized in that: A recovery belt conveyor is arranged at the entrance of the return ore bin, and the other discharge port of the three-way distributor and the undersize outlet of the first vibrating screen are both connected to the feed end of the recovery belt conveyor.

4. A large-size ore screening and recovery system according to claim 1, characterized in that: An intermediate belt conveyor is arranged at the bottom entrance of the bucket elevator, the feeding end of the intermediate belt conveyor is connected with the screen material outlet of the first vibrating screen, and the discharging end of the intermediate belt conveyor is connected with the bottom entrance of the bucket elevator.

5. A large-size ore screening and recovery system according to claim 1, characterized in that: A large-particle return ore bin is arranged between the top outlet of the bucket elevator and the second vibrating screen, the inlet of the large-particle return ore bin is connected to the top outlet of the bucket elevator, and the outlet of the large-particle return ore bin is connected to the inlet of the second vibrating screen.

6. A large-size ore screening and recovery system according to claim 1, characterized in that: The outlet of the screened material of the second vibrating screen is also connected to a weighing hopper, and a main ore belt is arranged at the discharge port below the weighing hopper, and the discharge port of the main ore belt is connected to the entrance of the blast furnace roof.

7. A large-size ore screening and recovery system according to claim 2, characterized in that: The outlet of the undersize material of the second vibrating screen is also connected to a secondary belt conveyor for returning ore, and the outlet end of the secondary belt conveyor for returning ore is connected to the inlet of the three-way distributor.

8. A large-size ore screening and recovery system according to claim 1, characterized in that: The first vibrating screen and the second vibrating screen are both polyurethane vibrating screens with a mesh size of 3 mm.

Images