Environment-friendly kiln for lithium ore smelting

Abstract

The utility model relates to the technical field of metallurgical equipment, and discloses an environment-friendly kiln for lithium ore smelting, which comprises a kiln and a waste gas treatment mechanism, the side wall of the kiln is provided with a waste gas outlet, the inside of the kiln is provided with a feed port, and one side of the waste gas outlet far away from the kiln is provided with a heat exchange mechanism. A waste gas pipeline and a smoke outlet are arranged on the two sides of the waste gas treatment mechanism respectively, the heat exchange mechanism comprises a heat exchange cavity, a cold side outlet and a cold side inlet are formed in the two sides of the heat exchange cavity respectively, and a plurality of spoilers are installed in the side, close to the heat exchange mechanism, of the waste gas outlet. In the utility model, the spoiler is arranged in front of the heat exchanger to prolong the retention time of waste gas and improve the heat exchange efficiency. Meanwhile, an alkaline solution is sprayed to neutralize acidic components, generated solid byproducts such as sodium sulfate and calcium sulfate can be recycled for building materials or chemical engineering after being separated from liquid, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical equipment, in particular to an environmentally friendly kiln for lithium ore smelting. Background Art

[0002] With the world's increasing attention to environmental protection and sustainable development, various industries have turned to green production. As an important resource for the new energy industry, lithium ore often produces a large amount of waste gas and high energy consumption during its smelting process, including sulfur dioxide, nitrogen oxides, dust and a small amount of metal oxides. In order to meet increasingly stringent environmental regulations, the development of high-efficiency, low-emission environmentally friendly kilns has become key. An environmentally friendly kiln for lithium ore smelting not only reduces pollutant emissions but also significantly improves energy utilization efficiency by optimizing the furnace structure, using clean energy, integrating an exhaust gas treatment system and a heat recovery device. This equipment not only promotes the green development of lithium resources, but also provides important support for the sustainable development of the new energy industry chain.

[0003] The environmentally friendly kiln for lithium ore smelting boasts a scientific and efficient structural design. It primarily comprises a furnace, heating system, and exhaust gas treatment system, with the furnace and exhaust gas treatment system being the core components. Constructed from highly refractory and corrosion-resistant materials, the furnace is the core area for high-temperature calcination of the ore, capable of withstanding temperatures ranging from 700°C to 1200°C while ensuring high lithium extraction rates. The exhaust gas treatment system utilizes dust removal, desulfurization, and denitrification devices to effectively purify exhaust gases, ensuring compliance with environmental standards. The entire kiln not only enables efficient lithium ore smelting, but also significantly reduces pollution and energy waste, providing a solid foundation for green smelting.

[0004] The existing technology has certain deficiencies in waste gas heat recovery and treatment. In the waste gas heat recovery link, the heat exchanger design may not fully consider the flow characteristics of the waste gas, resulting in insufficient heat exchange efficiency and failure to fully recover the heat in the waste gas for use in the production link. In addition, the waste gas stays in the heat exchanger for a short time, and there is a lack of effective turbulence measures, which limits the time and effect of heat exchange and further reduces energy utilization. In the waste gas treatment link, the neutralization reaction efficiency in the existing spray system is low, the contact area or reaction time between the spray liquid and the waste gas is insufficient, and the acidic components in the waste gas cannot be effectively removed, resulting in residual harmful gases. At the same time, the solid products generated by neutralization, such as sodium sulfate and calcium sulfate, are not completely separated from the liquid products, which affects the recycling of by-products and increases the processing cost.

[0005] In view of the above problems, an environmentally friendly kiln for lithium ore smelting is proposed to solve the above problems. Utility Model Content

[0006] In order to make up for the above shortcomings, the utility model provides an environmentally friendly kiln for lithium ore smelting, which aims to solve the problems of low waste gas heat recovery efficiency, incomplete acid waste gas treatment and difficulty in separating and recovering neutralization by-products.

[0007] In order to achieve the above-mentioned object, the utility model adopts the following technical solution: an environmentally friendly kiln for lithium ore smelting, comprising a kiln and an exhaust gas treatment mechanism, wherein an exhaust gas outlet is installed on the side wall of the kiln, a feed port is installed inside the kiln, a heat exchange mechanism is installed on the side of the exhaust gas outlet away from the kiln, and exhaust gas pipes and smoke outlets are respectively provided on both sides of the exhaust gas treatment mechanism;

[0008] The heat exchange mechanism includes a heat exchange cavity, and a cold side outlet and a cold side inlet are respectively installed on both sides of the heat exchange cavity. A plurality of spoilers are installed inside the side of the exhaust gas outlet close to the heat exchange mechanism.

[0009] As a further description of the above technical solution:

[0010] The waste gas treatment mechanism comprises a treatment chamber, wherein a spray component and a precipitation component are arranged inside the treatment chamber.

[0011] As a further description of the above technical solution:

[0012] The spray assembly comprises a spray head, a spray chamber is provided below the spray head, a filler is provided inside the spray chamber, and a plurality of through holes are opened at the bottom of the spray chamber.

[0013] As a further description of the above technical solution:

[0014] The sedimentation assembly includes a sedimentation tank, a filter plate is installed inside the sedimentation tank, and a handle is fixedly connected to the outside of the sedimentation tank.

[0015] As a further description of the above technical solution:

[0016] The sedimentation tank is slidably connected to the interior of the treatment chamber, and the sedimentation tank is located below the spray chamber.

[0017] As a further description of the above technical solution:

[0018] The spray chamber is fixedly connected to the inner middle portion of the processing chamber, and the spray head is fixedly connected to the inner top portion of the processing chamber.

[0019] As a further description of the above technical solution:

[0020] The cold side outlet is connected to the interior of the kiln through a hose, and a control valve is installed inside the hose.

[0021] As a further description of the above technical solution:

[0022] The side of the heat exchange chamber away from the exhaust gas outlet is connected to the exhaust gas pipe through a flange.

[0023] The utility model has the following beneficial effects:

[0024] 1. In the present invention, the heat exchanger is used to better exchange the heat in the exhaust gas and return it to the kiln, and a spoiler is provided in the pipe before the heat exchanger to increase the time the exhaust gas stays in the heat exchanger as much as possible, thereby improving the heat exchange time.

[0025] 2. In the present invention, the exhaust gas is sent into the treatment chamber after being filtered for dust, and some alkaline solution is sprayed through the spray head, which can react with the acidic components in the exhaust gas to generate neutralization products, among which solid products such as sodium sulfate and calcium sulfate are separated from the remaining liquid products. The solid products can be recovered as by-products and used for building materials or other chemical purposes, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional schematic diagram of an environmentally friendly kiln for lithium ore smelting proposed in the utility model;

[0027] Figure 2 This is a schematic structural diagram of a heat exchange mechanism of an environmentally friendly kiln for lithium ore smelting proposed in the present invention;

[0028] Figure 3 This is a schematic structural diagram of a spoiler for an environmentally friendly kiln for lithium ore smelting proposed in the present invention;

[0029] Figure 4 This is a schematic structural diagram of a filler for an environmentally friendly kiln for lithium ore smelting proposed in the present invention;

[0030] Figure 5 This is a structural schematic diagram of a sedimentation tank of an environmentally friendly kiln for lithium ore smelting proposed in the utility model.

[0031] Legend:

[0032] 1. Kiln; 2. Exhaust gas outlet; 3. Feed inlet; 4. Heat exchange mechanism; 401. Heat exchange chamber; 402. Cold side outlet; 403. Cold side inlet; 5. Exhaust gas duct; 6. Exhaust gas treatment mechanism; 601. Treatment chamber; 602. Spray head; 603. Filler; 604. Spray chamber; 605. Handle; 606. Sedimentation tank; 607. Filter plate; 7. Smoke outlet; 8. Control valve; 9. Spoiler. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Figure 1 - Figure 3 The utility model provides an embodiment: an environmentally friendly kiln for lithium ore smelting, comprising a kiln 1 and an exhaust gas treatment mechanism 6, an exhaust gas outlet 2 is installed on the side wall of the kiln 1, a feed port 3 is installed inside the kiln 1, a heat exchange mechanism 4 is installed on the side of the exhaust gas outlet 2 away from the kiln 1, the heat exchange mechanism 4 includes a heat exchange chamber 401, a cold side outlet 402 and a cold side inlet 403 are respectively installed on both sides of the heat exchange chamber 401, the cold side outlet 402 is connected to the interior of the kiln 1 through a hose, a control valve 8 is installed inside the hose, a plurality of spoilers 9 are installed inside the side of the exhaust gas outlet 2 close to the heat exchange mechanism 4, and the side of the heat exchange chamber 401 away from the exhaust gas outlet 2 is connected to the exhaust gas pipe 5 through a flange.

[0035] Specifically, in this embodiment, the side wall of the kiln 1 is equipped with an exhaust gas outlet 2, and the exhaust gas generated during the lithium ore smelting is discharged from the kiln 1 through the exhaust gas outlet 2. A feed port 3 is installed inside the kiln 1. After the feed port 3 is opened, the lithium ore raw material can be fed into the kiln 1. The heat exchange mechanism 4 is connected to the exhaust gas outlet 2 through a flange. The heat exchange mechanism 4 can utilize the heat in the exhaust gas, and send air from the outside through the cold side inlet 403. The waste heat contained in the exhaust gas is exchanged with the outside air through the mechanism in the heat exchange chamber 401, and then the heated air is sent into the kiln 1 through the cold side inlet 403. This process can be freely controlled by using the control valve 8. In order to increase the residence time of the exhaust gas in the heat exchange chamber 401 to improve the heat exchange effect, a plurality of baffles 9 are arranged inside the exhaust gas outlet 2 on the side close to the heat exchange mechanism 4. After heat exchange, the exhaust gas is sent into the exhaust gas treatment mechanism 6 through the exhaust pipe 5.

[0036] Reference Figure 1 , Figure 4 , Figure 5, exhaust gas pipes 5 and smoke outlets 7 are respectively provided on both sides of the exhaust gas treatment mechanism 6, the exhaust gas treatment mechanism 6 includes a treatment chamber 601, a spray assembly and a sedimentation assembly are provided inside the treatment chamber 601, the spray assembly includes a spray head 602, a spray chamber 604 is provided below the spray head 602, a filler 603 is provided inside the spray chamber 604, and a plurality of through holes are provided at the bottom of the spray chamber 604, the sedimentation assembly includes a sedimentation tank 606, a filter plate 607 is installed inside the sedimentation tank 606, a handle 605 is fixedly connected to the outside of the sedimentation tank 606, the sedimentation tank 606 is slidably connected to the inside of the treatment chamber 601, the sedimentation tank 606 is located below the spray chamber 604, the spray chamber 604 is fixedly connected to the inner middle part of the treatment chamber 601, and the spray head 602 is fixedly connected to the inner top of the treatment chamber 601.

[0037] Specifically, after heat exchange, the exhaust gas enters the treatment chamber 601 through the exhaust gas pipe 5. After the spray head 602 is started, the alkaline solution is sprayed inside the treatment chamber 601, which can effectively neutralize the acidic substances in the exhaust gas. In order to improve the efficiency of the neutralization reaction, the interior of the spray chamber 604 is filled with fillers 603, aiming to reduce the flow rate of the exhaust gas and extend the residence time of the exhaust gas in the treatment chamber 601, thereby increasing the contact opportunity between the exhaust gas and the spray liquid and improving the neutralization or absorption efficiency. The exhaust gas can be discharged from the smoke outlet 7, and the solid precipitate and solution mixture produced after the reaction fall into the sedimentation tank 606, and the filter plate 607 separates the two, which is conducive to subsequent recycling.

[0038] Working Principle: Exhaust gas generated during lithium ore smelting is discharged from the sidewall exhaust outlet 2 of the kiln 1 and connected to the heat exchange mechanism 4 via a flange. Outside air is introduced into the heat exchange chamber 401 via the cold-side inlet 403. The exhaust gas's residence time within the chamber is extended by a baffle 9, allowing for sufficient heat exchange. The heated air is then returned to the kiln 1 via the cold-side outlet 402, improving heat utilization efficiency. The heat-exchanged exhaust gas enters the treatment chamber 601 through the exhaust pipe 5. The spray head 602 sprays an alkaline solution to fully react with the acidic components in the exhaust gas. The neutralized exhaust gas is then discharged from the smoke outlet 7. The packing 603 in the treatment chamber 601 reduces the exhaust gas flow rate, prolongs the reaction time, and improves neutralization efficiency. The solid precipitate and liquid mixture produced by the reaction enter the sedimentation tank 606 below the spray chamber 604. The solid-liquid separation is achieved by a filter plate 607, facilitating the recovery of the solid byproducts.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An environmentally friendly kiln for lithium ore smelting, comprising a kiln (1) and an exhaust gas treatment mechanism (6), characterized in that: The side wall of the kiln (1) is provided with an exhaust gas outlet (2), a feed port (3) is provided inside the kiln (1), a heat exchange mechanism (4) is provided on the side of the exhaust gas outlet (2) away from the kiln (1), and exhaust gas pipes (5) and smoke outlets (7) are provided on both sides of the exhaust gas treatment mechanism (6); The heat exchange mechanism (4) comprises a heat exchange chamber (401), a cold side outlet (402) and a cold side inlet (403) are respectively installed on both sides of the heat exchange chamber (401), and a plurality of spoilers (9) are installed inside a side of the exhaust gas outlet (2) close to the heat exchange mechanism (4).

2. The environmentally friendly kiln for lithium ore smelting according to claim 1, characterized in that: The waste gas treatment mechanism (6) comprises a treatment chamber (601), wherein a spray component and a precipitation component are arranged inside the treatment chamber (601).

3. The environmentally friendly kiln for lithium ore smelting according to claim 2, characterized in that: The spray assembly comprises a spray head (602), a spray chamber (604) is provided below the spray head (602), a filler (603) is provided inside the spray chamber (604), and a plurality of through holes are provided at the bottom of the spray chamber (604).

4. The environmentally friendly kiln for lithium ore smelting according to claim 3, characterized in that: The sedimentation assembly includes a sedimentation tank (606), a filter plate (607) is installed inside the sedimentation tank (606), and a handle (605) is fixedly connected to the outside of the sedimentation tank (606).

5. The environmentally friendly kiln for lithium ore smelting according to claim 4, characterized in that: The sedimentation tank (606) is slidably connected to the interior of the treatment chamber (601), and the sedimentation tank (606) is located below the spray chamber (604).

6. The environmentally friendly kiln for lithium ore smelting according to claim 3, characterized in that: The spray chamber (604) is fixedly connected to the inner middle portion of the processing chamber (601), and the spray head (602) is fixedly connected to the inner top portion of the processing chamber (601).

7. The environmentally friendly kiln for lithium ore smelting according to claim 1, characterized in that: The cold side outlet (402) is connected to the interior of the kiln (1) through a hose, and a control valve (8) is installed inside the hose.

8. The environmentally friendly kiln for lithium ore smelting according to claim 1, characterized in that: The side of the heat exchange chamber (401) away from the exhaust gas outlet (2) is connected to the exhaust gas pipe (5) via a flange.

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