Overall-process dust-free closed-loop treatment system for ash of Ausmelt smelting furnace

Abstract

The utility model discloses an Ausmelt smelting furnace ash whole-process dust-free closed cycle treatment system which comprises an Ausmelt furnace body, a boiler flue is arranged on the top of the Ausmelt furnace body, a first electric field, a second electric field, a third electric field and a fourth electric field are sequentially arranged on one side of the boiler flue, and the lower ends of the third electric field and the fourth electric field are connected with a first bag-type dust collector through an ash conveying flue. The bag-type dust collector I is used for collecting smoke dust of the electric field III and the electric field IV; the lower ends of the electric field I and the electric field II are connected with a soot circulating treatment mechanism through a soot conveying flue; cigarette ash of the first electric field and the second electric field is recycled and collected by the cloth bag dust collector and then directly conveyed to the concentrate warehouse through the spiral, the cigarette ash is made into particles through the cigarette ash granulator, flying dust generated in the transportation process of the cigarette ash is greatly reduced, the cigarette ash is conveyed back to the austenite furnace through the closed conveying equipment for secondary utilization, and the production cost is reduced. And a bag-type dust collector III is additionally arranged at the closed conveying equipment and the soot granulator, so that the dust collection efficiency can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas recycling treatment technology for copper pyrometallurgical furnaces, specifically a dust-free closed-loop recycling system for flue gas from an Ausmelt furnace throughout the entire process. Background Technology

[0002] The Austro-Met furnace (AMS) smelting method is one of the main methods for copper smelting. The Austro-Met furnace uses a charging system to add a mixture of copper concentrate, flux, and lump coal from the top. Oxygen, air, and pulverized coal, necessary for copper concentrate smelting, are blown into the molten pool from the top through a lance. Near the lance nozzle, the concentrate reacts violently with the smelt, providing heat and continuously agitating the pool. The concentrate rapidly completes the melting, oxidation, and desulfurization processes, producing matte, slag, and high-temperature flue gas. The high-temperature flue gas rises through the flue into the boiler for cooling, then enters an electrostatic precipitator for further cooling and dust collection, and is finally transported to the acid production system for acid production. The high-temperature flue gas from the Australian furnace rises from the furnace, while the copper concentrate and other materials fed into the furnace fall from the top. The materials and flue gas move towards each other, resulting in the flue gas being mixed with a large number of concentrate particles, copper matte, and high-temperature melt particles of slag. This high-dust-content flue gas is cooled and settled by the boiler, with large dust particles settling at the boiler end. The relatively clean high-temperature flue gas enters the electrostatic precipitator and high-efficiency dust collector to further remove the dust from the flue gas, reducing the dust concentration in the flue gas to 350 mg / Nm³.

[0003] In traditional processes, electrostatic precipitators (ESPs) consist of four electric fields. With a designed concentrate processing capacity of 180 t / h at the auger furnace, the ESPs collect approximately 50 tons of flue dust daily from these four fields. Fields #1 and #2 collect about 30 tons daily, while fields #3 and #4 collect about 20 tons daily. This flue dust is transported by compressed air to different baghouse dust collectors. Flue dust from fields #3 and #4 is sold directly, while flue dust from fields #1 and #2 is conveyed by screw conveyors to the concentrate silo for recycling. After entering the concentrate silo, the flue dust is mixed with other copper concentrates using a trolley and then transported back to the auger furnace via belt conveyor. The process of directly conveying the flue dust from fields #1 and #2 to the concentrate silo after collection by baghouse dust collectors and screw conveyors generates significant dust pollution due to the dryness and small particle size of the flue dust, severely deteriorating the concentrate silo environment. The mixing of the returned flue dust with the concentrate also generates substantial dust pollution, further worsening the environment and causing metal loss. To address the aforementioned issues, a closed-loop, dust-free recycling system for the entire process of flue gas from the Ausmelt smelting furnace is proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the above problems by providing a dust-free closed-loop circulation treatment system for flue gas from the Ausmelt smelting furnace throughout the entire process.

[0005] The specific solution of this utility model is: a closed-loop dust-free recycling system for the entire process of flue gas from an Ausmelt smelting furnace, comprising: an Ausmelt furnace body, a boiler flue at the top of the furnace body, and electric fields one, two, three, and four arranged sequentially on one side of the boiler flue. The lower ends of electric fields three and four are connected to a bag filter one via an ash conveying flue, the bag filter one being used to collect the flue gas from electric fields three and four; the lower ends of electric fields one and two are connected to an ash recycling mechanism via the ash conveying flue, the ash recycling mechanism comprising:

[0006] Baghouse dust collector 2, wherein the baghouse dust collector 2 is connected to the lower ends of electric field 1 and electric field 2 through a ash conveying flue;

[0007] A screw conveyor, one end of which is connected to the bottom of a bag filter and the other end of which is connected to a flue dust granulator. The flue dust granulator is used to process the flue dust conveyed by the screw conveyor into granules.

[0008] A closed conveying device, one end of which is connected to a fly ash granulator, and the other end of which is connected to the furnace body via a hopper.

[0009] Furthermore, the enclosed conveyor equipment includes: a belt conveyor, the belt conveyor being equipped with a sealing cover, the sealing cover being used to cover the belt conveyor.

[0010] Furthermore, it also includes: a bag filter dust collector three, one side of which is connected to the sealing cover through a dust collection pipe for collecting the dust generated by the belt conveyor during transportation; the other side of the bag filter dust collector three is also provided with a dust collection pipe, and the other end of the dust collection pipe is provided with a dust collection cover, which is located above the ash granulator for collecting the dust generated when the ash granulator is working.

[0011] Furthermore, the boiler flue includes: an ascending flue, one side of which is connected to a descending flue, and the lower end of which is connected to a horizontal flue.

[0012] Furthermore, the particles produced by the ash pelletizer are 5 to 10 millimeters in size.

[0013] Furthermore, the feeding hopper is a conical hopper.

[0014] This utility model has the following beneficial effects: The utility model has a simple structure and is easy to operate. The flue dust from the No. 1 and No. 2 electric fields is collected by a bag dust collector and then directly conveyed to the concentrate silo using a screw conveyor. In this process, the flue dust is granulated by the flue dust granulator, which greatly reduces the dust generated during the transportation of the flue dust. The flue dust is then transported back to the furnace for secondary utilization through a closed conveying device. The addition of a bag dust collector at the closed conveying device and the flue dust granulator can greatly improve the dust removal efficiency, extend the service life of the equipment, make the equipment less prone to damage, and protect the working environment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the structural principle of this utility model;

[0016] In the diagram: 1. Boiler body; 2. Electric field one; 3. Electric field two; 4. Electric field three; 5. Electric field four; 6. Boiler flue; 601. Rising flue; 602. Falling flue; 603. Horizontal flue; 7. Baghouse dust collector one; 8. Baghouse dust collector two; 9. Screw conveyor; 10. Ash granulator; 11. Belt conveyor; 12. Sealing cover; 13. Baghouse dust collector three; 14. Dust collection pipe; 15. Dust collection hood; 16. Feed hopper; 17. Ash conveying flue. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Please refer to Figure 1 A closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace includes: an Ausmelt furnace body 1, a boiler flue 6 at the top of the furnace body 1, and electric fields 2, 3, 4, and 5 sequentially arranged on one side of the boiler flue 6. The lower ends of electric fields 4 and 5 are connected to a bag filter 7 via an ash conveying flue 17, which collects the flue gas from electric fields 4 and 5. The lower ends of electric fields 2 and 3 are connected to an ash recycling mechanism via the ash conveying flue 17, which includes:

[0021] Baghouse dust collector 2 8 is connected to the lower ends of electric field 1 2 and electric field 2 3 through ash conveying flue 17;

[0022] The screw conveyor 9 has one end connected to the bottom of the bag filter 8 and the other end connected to the flue dust granulator 10. The flue dust granulator 10 is used to process the flue dust conveyed by the screw conveyor 9 into granules.

[0023] A closed conveying device, one end of which is connected to the ash granulator 10, and the other end of which is connected to the furnace body 1 via the hopper 16.

[0024] In this embodiment, the enclosed conveyor equipment includes: a belt conveyor 11, and a sealing cover 12 is provided on the belt conveyor 11, which is used to cover the belt conveyor 11.

[0025] In this embodiment, it also includes: a bag dust collector 13, one side of which is connected to the sealing cover 12 via a dust collection pipe 14, for collecting the dust generated by the belt conveyor 11 during transportation; the other side of the bag dust collector 13 is also provided with a dust collection pipe 14, and the other end of the dust collection pipe 14 is provided with a dust collection cover 15, which is located above the ash granulator 10 and is used to collect the dust generated by the ash granulator 10 during operation.

[0026] In this embodiment, the boiler flue 6 includes: an ascending flue, a descending flue connected to one side of the ascending flue, and a horizontal flue 603 connected to the lower end of the descending flue.

[0027] In this embodiment, the particles produced by the ash pelletizer 10 are 5 to 10 millimeters in size.

[0028] In this embodiment, the feeding hopper 16 is a conical hopper.

[0029] This utility model has the following beneficial effects: The utility model has a simple structure and is easy to operate. The flue dust from the No. 1 and No. 2 electric fields is collected by a bag dust collector and then directly conveyed to the concentrate silo using a screw conveyor. In this process, the flue dust granulator 10 makes the flue dust into granules, which greatly reduces the dust generated during the transportation of the flue dust. The flue dust is then transported back to the furnace for secondary use through a closed conveying device. A bag dust collector 3 13 is added to the closed conveying device and the flue dust granulator 10, which can greatly improve the dust removal efficiency, extend the service life of the equipment, make the equipment less prone to damage, and protect the working environment.

Claims

1. A closed-loop, dust-free recycling system for the entire process of flue gas treatment in an Ausmelt smelting furnace, comprising: The furnace body has a boiler flue at its top, and electric fields one, two, three, and four are sequentially arranged on one side of the boiler flue. The furnace body is characterized in that: the lower ends of electric fields three and four are connected to a bag filter dust collector one via an ash conveying flue, the bag filter dust collector one being used to collect the flue dust from electric fields three and four; the lower ends of electric fields one and two are connected to an ash recycling mechanism via the ash conveying flue, the ash recycling mechanism comprising: Baghouse dust collector 2, wherein the baghouse dust collector 2 is connected to the lower ends of electric field 1 and electric field 2 through a ash conveying flue; A screw conveyor, one end of which is connected to the bottom of a bag filter and the other end of which is connected to a flue dust granulator. The flue dust granulator is used to process the flue dust conveyed by the screw conveyor into granules. A closed conveying device, one end of which is connected to a fly ash granulator, and the other end of which is connected to the furnace body via a hopper.

2. The closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace according to claim 1, characterized in that: The enclosed conveyor equipment includes: a belt conveyor, the belt conveyor being equipped with a sealing cover, the sealing cover being used to cover the belt conveyor.

3. The closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace according to claim 2, characterized in that: it also... include: The third bag filter has a dust collection pipe on one side connected to the sealing cover for collecting dust generated during the conveyor belt transportation process; the other side of the third bag filter also has a dust collection pipe, and the other end of the dust collection pipe has a dust collection cover. The dust collection cover is located above the ash granulator for collecting dust generated during the operation of the ash granulator.

4. The closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace according to claim 1, characterized in that: The boiler flue includes: an ascending flue, a descending flue connected to one side of the ascending flue, and a horizontal flue connected to the lower end of the descending flue.

5. The closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace according to claim 1, characterized in that: The particles produced by the ash pelletizer are 5 to 10 millimeters in size.

6. The closed-loop dust-free recycling system for flue gas from an Ausmelt smelting furnace according to claim 1, characterized in that: The feeding hopper is a conical hopper.

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