Internal heating rotary kiln heating device and low-grade valuable metal recovery equipment
Patent Information
- Application Number
- CN202521458697.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-07-11
AI Technical Summary
现有技术中的回转窑，回转窑内的温度不均匀，靠近明火的地方温度较高，容易结焦
Smart Images
Figure CN224731042U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotary kiln technology, and in particular to an internally heated rotary kiln heating device and a low-grade valuable metal recycling equipment. Background Technology
[0002] Antimony oxide is an important raw material widely used in chemical, metallurgical, and electronics industries. Low-antimony ore contains antimony oxide, and high-purity solid antimony oxide can be recovered from it. Generally, low-antimony ore and carbon powder are heated in a rotary kiln with an internal open flame, while air is continuously blown in. The carbon powder reduces the antimony oxide in the low-antimony ore to antimony, which then reacts with oxygen to produce gaseous antimony oxide. The antimony-containing gas and solid impurities are separated by discharging them through different outlets, and then recovered through other devices to obtain high-purity solid antimony oxide. However, in existing rotary kilns, the temperature is uneven, with higher temperatures near the open flame, leading to coking. To ensure combustion, a large amount of air needs to be blown in, and excess oxygen reacts with the carbon powder, resulting in high carbon powder consumption. The same problems exist in existing technologies for refining zinc oxide and lead oxide from crude ore.
[0003] Therefore, it is necessary to provide an internally heated rotary kiln heating device and a low-grade valuable metal recycling equipment to solve the above-mentioned technical problems. Utility Model Content
[0004] This utility model provides an internal heating rotary kiln heating device and a low-grade valuable metal recovery equipment, which features a more uniform temperature inside the kiln, can prevent coking inside the kiln, does not require the injection of a large amount of air, saves carbon powder and reduces the pressure of exhaust gas purification.
[0005] The technical solution of this utility model is as follows:
[0006] An internally heated rotary kiln heating device, comprising:
[0007] The kiln body has a kiln head and a kiln tail at its two ends. The kiln head is equipped with a kiln material inlet and a kiln gas outlet, while the kiln tail is equipped with a kiln material outlet and a pipe inlet. The kiln material inlet is used to input low-grade valuable metal materials and carbon powder. The kiln gas outlet is used to output valuable metal gases and dust. The kiln material outlet is used to output residue. The pipe inlet is used for corresponding flue gas conveying pipes to pass through the kiln body.
[0008] The combustion chamber, which is used for combustion to produce high-temperature flue gas; and,
[0009] A flue gas conveying pipe passes through the pipe inlet, one end of the flue gas conveying pipe is connected to the outlet of the combustion chamber, and the other end extends into the interior of the kiln body.
[0010] In the internal heating rotary kiln heating device of this utility model, the length of the flue gas conveying pipe extending into the kiln body is 0-1 / 2 of the length of the kiln body.
[0011] In the internal heating rotary kiln heating device of this utility model, the length of the flue gas conveying pipe extending into the kiln body is 0-1 / 3 of the length of the kiln body.
[0012] In the internal heating rotary kiln heating device of this utility model, a first regulating valve is provided on the flue gas conveying pipeline to regulate the amount of high-temperature flue gas input into the kiln body.
[0013] In the internal heating rotary kiln heating device of this utility model, a kiln gas inlet is provided at the kiln tail for inputting air.
[0014] In the internal heating rotary kiln heating device of this utility model, a second regulating valve is provided at the kiln gas inlet for adjusting the gas volume.
[0015] In the internal heating rotary kiln heating device of this utility model, a temperature detector is installed inside the kiln body.
[0016] In the internal heating rotary kiln heating device of this utility model, when recovering antimony oxide, the temperature inside the kiln is 950℃-1050℃, and when recovering zinc oxide and lead oxide, the temperature inside the kiln is 1000℃-1200℃.
[0017] In the internal heating rotary kiln heating device of this utility model, the heating time of the kiln body is set to 1-4 hours.
[0018] Another technical solution of this utility model is:
[0019] A low-grade valuable metal recycling device, comprising:
[0020] The aforementioned internal heating rotary kiln heating device;
[0021] A settling chamber, the inlet of which is connected to the kiln gas outlet, is used to filter out dust from the valuable metal gas.
[0022] A surface cooler, its inlet connected to the outlet of the settling chamber, is used to cool the valuable metal gas; and,
[0023] A bag collector, whose inlet is connected to the outlet of the surface cooler, is used to collect solid target elements.
[0024] Compared with the prior art, the advantages of this utility model are as follows: In operation, the internally heated rotary kiln heating device and low-grade valuable metal recovery equipment of this utility model introduce low-grade valuable metal materials and carbon powder into the kiln body through the kiln material inlet. The flue gas conveying pipe transports the high-temperature flue gas generated in the combustion chamber to the kiln body, providing the required temperature and a certain amount of oxygen for the reaction. Valuable metal gas and dust are output from the kiln gas outlet, while other solid residues are output from the kiln material outlet. In this internally heated rotary kiln heating device and low-grade valuable metal recovery equipment, the combustion chamber and kiln body are separated, and the flue gas generated in the combustion chamber is transported to the kiln body through the flue gas conveying pipe. Therefore, the uniform temperature of the flue gas ensures a more uniform temperature within the kiln, preventing coking within the kiln body. Furthermore, it eliminates the need for large amounts of air injection, reducing carbon powder consumption and alleviating the pressure on tail gas purification. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.
[0026] Figure 1 A schematic diagram of the structure of a low-grade valuable metal recycling device provided in a preferred embodiment of this utility model.
[0027] in,
[0028] 11. Internal heating rotary kiln heating device,
[0029] 111. Kiln body; 1111. Kiln head; 1112. Kiln tail; 1113. Kiln material inlet; 1114. Kiln material outlet; 1115. Pipeline inlet; 1116. Kiln gas outlet.
[0030] 112. Combustion chamber,
[0031] 113. Flue gas conveying pipeline,
[0032] 12. Settling chamber
[0033] 13. Surface cooler,
[0034] 14. Bag collector.
[0035] In the diagram, units with similar structures are represented by the same labels. Detailed Implementation
[0036] 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 some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0037] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.
[0038] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.
[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0040] In existing rotary kilns, the temperature is uneven, with higher temperatures near the open flame, making it easy for antimony oxide to coke. To ensure combustion, a large amount of air needs to be blown in; however, excessive oxygen reacts with the carbon powder, resulting in high carbon powder consumption.
[0041] The following is a preferred embodiment of an internally heated rotary kiln heating device and a low-grade valuable metal recycling device provided by this utility model, which can solve the above technical problems.
[0042] A preferred embodiment of this utility model provides a low-grade valuable metal recycling device. Please refer to... Figure 1 The low-grade valuable metal recovery equipment includes an internally heated rotary kiln heating unit 11, a settling chamber 12, a surface cooler 13, and a bag filter 14. The inlet of the settling chamber 12 is connected to the kiln gas outlet 1116 to filter out dust from the valuable metal gas. The inlet of the surface cooler 13 is connected to the outlet of the settling chamber 12 to cool the valuable metal gas. The inlet of the bag filter 14 is connected to the outlet of the surface cooler 13 to collect solid target elements.
[0043] The internally heated rotary kiln heating device 11 includes a kiln body 111, a combustion chamber 112, and a flue gas conveying pipe 113. The kiln body 111 has a kiln head 1111 and a kiln tail 1112 at its two ends. The kiln head 1111 is equipped with a kiln material inlet 1113 and a kiln gas outlet 1116, while the kiln tail 1112 is equipped with a kiln material outlet 1114 and a pipe inlet 1115. The kiln material inlet 1113 is used to input low-grade valuable metal materials and carbon powder. The kiln gas outlet 1116 is used to output valuable metal gases and dust. The kiln material outlet 1114 is used to output residue. The pipe inlet 1115 allows the corresponding flue gas conveying pipe 113 to pass into the kiln body 111. The combustion chamber 112 is used to generate high-temperature flue gas through combustion. The flue gas conveying pipe 113 passes through the pipe inlet 1115, with one end connected to the outlet of the combustion chamber 112 and the other end extending into the interior of the kiln body 111.
[0044] This invention relates to an internally heated rotary kiln heating device 11 and a low-grade valuable metal recovery device. During operation, low-grade valuable metal materials and carbon powder are added to the kiln body 111 through the kiln material inlet 1113. The flue gas conveying pipe 113 transports the high-temperature flue gas generated in the combustion chamber 112 to the kiln body 111, providing the necessary temperature and a certain amount of oxygen for the reaction. Valuable metal gases and dust are output from the kiln gas outlet 1116, while other solid residues are output from the kiln material outlet 1114. In this internally heated rotary kiln heating device 11 and low-grade valuable metal recovery device, the combustion chamber 112 and the kiln body 111 are separately arranged, and the flue gas generated in the combustion chamber 112 is transported to the kiln body 111 through the flue gas conveying pipe 113. Therefore, the uniform temperature of the flue gas ensures a relatively uniform temperature within the kiln body 111, preventing coking within the kiln body. Furthermore, it eliminates the need for large amounts of air injection, reducing carbon powder consumption and alleviating the pressure on exhaust gas purification.
[0045] The length of the flue gas conveying pipe 113 extending into the kiln body 111 is 0-1 / 2 of the length of the kiln body 111. High-temperature flue gas can be directly sent to the main reaction zone inside the kiln body 111, which not only improves the utilization efficiency of the heat of the high-temperature flue gas, but also facilitates the cooling and discharge of the material after the reaction.
[0046] The length of the flue gas conveying pipe 113 extending into the kiln body 111 is 1 / 3 of the length of the kiln body 111, which can maximize the utilization rate of high-temperature flue gas.
[0047] A first regulating valve is installed on the flue gas conveying pipe 113 to regulate the amount of high-temperature flue gas input into the kiln body 111. By regulating the amount of high-temperature flue gas input into the kiln body 111 through the first regulating valve, the temperature of the kiln body 111 is controlled.
[0048] The kiln tail 1112 is equipped with a kiln gas inlet for introducing air. When there is a large amount of material inside the kiln body 111, the oxygen in the high-temperature flue gas is insufficient, so air can be introduced through the kiln gas inlet.
[0049] A second regulating valve is installed at the kiln gas inlet to adjust the gas flow rate. The amount of oxygen input can be adjusted according to the amount of material.
[0050] A temperature detector is installed inside the kiln body 111. The temperature inside the kiln body 111 can be monitored in real time in order to adjust the input of high-temperature flue gas.
[0051] When recovering antimony oxide, the temperature inside kiln 111 is 950℃-1050℃, and when recovering zinc oxide and lead oxide, the temperature inside kiln 111 is 1000℃-1200℃, which allows the materials to react fully.
[0052] The heating time of kiln body 111 is set to 1-4 hours to allow the materials to react fully.
[0053] The working principle of the low-grade valuable metal recycling equipment of the preferred embodiment of this utility model:
[0054] When the low-grade valuable metal material is low-antimony ore:
[0055] Low-antimony ore needs to be mixed with 15%-30% pulverized coal, mainly to provide the C and CO required for carbon reduction. The low-antimony ore contains approximately 2%-5% antimony, primarily in the form of Sb₂O₃. The low-antimony ore and pulverized coal are added to the kiln body 111 through the kiln material inlet 1113. The high-temperature flue gas generated in the combustion chamber 112 is transported to the kiln body 111 through the flue gas conveying pipe 113, providing the necessary temperature and a certain amount of oxygen for the reaction. When there is a large amount of material in the kiln body 111, a certain amount of oxygen is introduced into the kiln body 111 through the kiln gas inlet. The temperature is controlled at 950℃-1050℃, and the residence time is 1-4 hours. The oxygen content is <3% to ensure that C is converted into CO as much as possible, preventing complete combustion of C from causing the kiln body 111 to overheat and easily slag. The material slowly moves from the kiln head 1111 to the kiln tail 1112.
[0056] Antimony oxide in low-antimony ore is first reduced to elemental antimony, and the specific reaction formula can be:
[0057] Sb₂O₃ + 3C → 2Sb + 3CO;
[0058] Sb₂O₃ + 3CO → 2Sb + 3CO₂;
[0059] CO2 + C → 2CO.
[0060] Elemental antimony then reacts with oxygen to form antimony oxide. The antimony-containing gas exits from the kiln gas outlet 1116, while other solid residues exit from the kiln material outlet 1114. The antimony-containing gas enters the settling chamber 12, where dust is filtered out. The dust-free antimony-containing gas then enters the surface cooler 13, where the antimony oxide in the gas is converted into a solid powder. The powdered antimony oxide enters the bag filter 14, where high-purity solid antimony oxide can be collected.
[0061] When the low-grade valuable metal material is a low-zinc, low-lead ore:
[0062] Low-zinc, low-lead ore and carbon powder are added into the kiln body 111 through the kiln material inlet 1113. The high-temperature flue gas generated in the combustion chamber 112 is transported to the kiln body 111 through the flue gas conveying pipe 113, providing the necessary temperature and a certain amount of oxygen for the reaction. When there is a large amount of material in the kiln body 111, a certain amount of oxygen is introduced into the kiln body 111 through the kiln gas inlet. The temperature is controlled at 1000℃-1200℃, and the residence time is 1-4 hours. The oxygen content is <3% to ensure that C is converted into CO as much as possible, preventing complete combustion of C from causing the kiln body 111 to overheat and easily slag. The material slowly moves from the kiln head 1111 to the kiln tail 1112.
[0063] Lead oxide and zinc oxide in low-lead-zinc ore are first reduced to elemental lead and zinc, as shown in the following reaction formula:
[0064] PbO + C = Pb + CO;
[0065] ZnO + C = Zn + CO;
[0066] PbO + CO = Pb + CO2;
[0067] ZnO + CO = Zn + CO2.
[0068] Subsequently, elemental zinc and lead react with oxygen to form smaller particles of zinc oxide and lead oxide. The zinc-lead-containing gas exits from kiln gas outlet 1116, while other solid residues exit from kiln material outlet 1114. The zinc-lead-containing gas enters settling chamber 12, where dust is filtered out. The dust-free lead-zinc-containing gas then enters surface cooler 13 for cooling and de-dusting. Finally, the dust-free lead-zinc-containing gas enters bag filter 14, where high-purity solid zinc oxide and lead oxide are collected.
[0069] This is the working principle of the low-grade valuable metal recycling equipment in this preferred embodiment.
[0070] This utility model discloses an internally heated rotary kiln heating device and a low-grade valuable metal recovery equipment. During operation, low-grade valuable metal materials and carbon powder are added to the kiln body through the kiln material inlet. A flue gas conveying pipe transports the high-temperature flue gas generated in the combustion chamber to the kiln body, providing the necessary temperature and a certain amount of oxygen for the reaction. Valuable metal gases and dust are output from the kiln gas outlet, while other solid residues are output from the kiln material outlet. In this internally heated rotary kiln heating device and low-grade valuable metal recovery equipment, the combustion chamber and kiln body are separated, and the flue gas generated in the combustion chamber is transported to the kiln body through a flue gas conveying pipe. Therefore, the uniform temperature of the flue gas ensures a relatively uniform temperature within the kiln, preventing coking within the kiln body. Furthermore, it eliminates the need for large amounts of air injection, reducing carbon powder consumption and alleviating the pressure on exhaust gas purification.
[0071] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the concept of the technical solution of the present invention, should be included within the scope of protection of the present invention.
Claims
1. An internally heated rotary kiln heating device, characterized in that, include: The kiln body has a kiln head and a kiln tail at its two ends. The kiln head is equipped with a kiln material inlet and a kiln gas outlet, while the kiln tail is equipped with a kiln material outlet and a pipe inlet. The kiln material inlet is used to input low-grade valuable metal materials and carbon powder. The kiln gas outlet is used to output valuable metal gases and dust. The kiln material outlet is used to output residue. The pipe inlet is used for corresponding flue gas conveying pipes to pass through the kiln body. The combustion chamber, which is used for combustion to produce high-temperature flue gas; and, A flue gas conveying pipe passes through the pipe inlet, one end of the flue gas conveying pipe is connected to the outlet of the combustion chamber, and the other end extends into the interior of the kiln body.
2. The internal heating rotary kiln heating device according to claim 1, characterized in that, The length of the flue gas conveying pipe extending into the kiln body is 0-1 / 2 of the length of the kiln body.
3. The internally heated rotary kiln heating device according to claim 1, characterized in that, The length of the flue gas conveying pipe extending into the kiln body is 1 / 3 of the length of the kiln body.
4. The internally heated rotary kiln heating device according to claim 1, characterized in that, The flue gas conveying pipeline is equipped with a first regulating valve, which is used to regulate the amount of high-temperature flue gas input into the kiln.
5. The internally heated rotary kiln heating device according to claim 1, characterized in that, The kiln tail is equipped with a kiln gas inlet for introducing air.
6. The internally heated rotary kiln heating device according to claim 5, characterized in that, A second regulating valve is installed at the gas inlet of the kiln to adjust the gas volume.
7. The internally heated rotary kiln heating device according to claim 1, characterized in that, A temperature detector is installed inside the kiln.
8. The internally heated rotary kiln heating device according to claim 1, characterized in that, When recovering antimony oxide, the temperature inside the kiln is 950℃-1050℃; when recovering zinc oxide and lead oxide, the temperature inside the kiln is 1000℃-1200℃.
9. The internally heated rotary kiln heating device according to claim 1, characterized in that, The heating time for the kiln body is set to 1-4 hours.
10. A low-grade valuable metal recycling device, characterized in that, include: The internal heating rotary kiln heating device according to any one of claims 1-9; A settling chamber, the inlet of which is connected to the kiln gas outlet, is used to filter out dust from the valuable metal gas. A surface cooler, its inlet connected to the outlet of the settling chamber, is used to cool the valuable metal gas; and, A bag collector, whose inlet is connected to the outlet of the surface cooler, is used to collect solid target elements.