Production line for reduction leaching of zinc-containing materials

Abstract

The zinc-containing material reduction leaching production line comprises a reaction kettle and a solid-liquid separation device, the interior of the reaction kettle is suitable for containing a zinc-containing material mixture, and the reaction kettle is further provided with a first air inlet, a first air outlet, a first feeding port and a first discharging port which communicate with a containing cavity; the first gas inlet is suitable for introducing reducing gas, and the reducing gas and the zinc-containing material mixture are subjected to a reduction leaching reaction; the solid-liquid separation device is arranged at the downstream of the reaction kettle, is connected with the first discharge hole and is used for carrying out solid-liquid separation on a product of the reaction kettle. Therefore, the reaction kettle and the solid-liquid separation device are matched, sulfur dioxide is adopted as a reducing gas in the process, and leaching can be completed at relatively low temperature and pressure, so that harsh reaction conditions such as high temperature and high pressure are avoided, production energy consumption and equipment investment can be saved, meanwhile, the reaction time can be shortened, and the leaching effect can be enhanced; and valuable elements are efficiently leached and enriched.

Description

Technical Field

[0001] The present application relates to the field of metallurgy technology, and in particular to a production line for reduction leaching of zinc-containing materials. Background Art

[0002] With the increasing depletion of high-grade zinc ore resources worldwide, the development and utilization of secondary zinc resources has become increasingly important. These secondary resources primarily originate from zinc-containing waste products generated during industrial production, such as zinc-containing fly ash. Zinc-containing fly ash is typically concentrated by pyrometallurgy before being recovered using hydrometallurgical processes to recover valuable metals. These processes primarily include acid leaching and alkaline leaching. However, both methods suffer from the high production of zinc-containing materials, such as leached residue, and the difficulty in achieving complete recovery of valuable metals. Currently, pyrometallurgical processes such as rotary kiln, top-blowing, oxygen-enriched side-blowing, and fuming are commonly used in the industry to treat zinc-containing materials. These processes include rotary kiln, top-blowing, oxygen-enriched side-blowing, and fuming. While the rotary kiln is the most mature, it suffers from difficulties in cleaning kiln agglomerates, low metal recovery rates, and high energy consumption and costs. While the top-blowing process offers a higher metal recovery rate, its complex supporting equipment and significant investment hinder widespread adoption. The fuming process, on the other hand, suffers from high coal consumption and low hearth capacity. Furthermore, the flue dust produced by these three processes contains high levels of impurities, making back-end processing technically challenging and costly. Furthermore, low concentrations of sulfur dioxide in flue gas are unstable and extremely difficult to handle, posing significant environmental challenges. Related methods for handling zinc-containing materials suffer from varying degrees of deficiencies, hindering efficient utilization of zinc-containing materials and maximizing resource recovery. Efficient leaching of zinc-containing materials, such as leaching residue from secondary zinc resources, as well as addressing zinc-iron separation and efficient recovery of valuable metals, remain pressing challenges for the industry. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a production line for reduction leaching of zinc-containing materials. The production line for reduction leaching of zinc-containing materials, through the coordination of a reactor and a solid-liquid separation device, and the use of sulfur dioxide as a reducing gas during the process, can complete leaching at relatively low temperatures and pressures, thereby avoiding the use of harsh reaction conditions such as high temperature and high pressure, saving production energy consumption and equipment investment, while also shortening the reaction time and enhancing the leaching effect, thereby achieving efficient leaching and enrichment of valuable elements.

[0004] According to some embodiments of the present application, a production line for reduction leaching of zinc-containing materials includes: a reactor and a solid-liquid separation device, wherein the reactor is suitable for accommodating a zinc-containing material mixture, and the reactor also has a first air inlet, a first air outlet, a first feed port and a first discharge port connected to the accommodating chamber, the first air inlet is suitable for introducing a reducing gas and performing a reduction leaching reaction with the zinc-containing material mixture; the solid-liquid separation device is arranged downstream of the reactor and connected to the first discharge port, and the solid-liquid separation device is used to perform solid-liquid separation on the product of the reactor.

[0005] According to the production line for reduction leaching of zinc-containing materials of the present application, a production process of reduction leaching in the reactor and solid-liquid separation in the solid-liquid separation device can be formed by cooperating with a reactor and a solid-liquid separation device. In the process, sulfur dioxide gas is used as a reducing gas, and the leaching reaction can be completed at a relatively low temperature and pressure, thereby avoiding the use of harsh reaction conditions such as high temperature and high pressure, saving production energy consumption and equipment investment. At the same time, it can also reduce the time required for the reaction and enhance the leaching effect, so that valuable elements can be efficiently leached and enriched, thereby improving production efficiency and providing high-quality raw materials for subsequent process flows, thereby realizing the high value and resource utilization of valuable metals.

[0006] According to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: a pretreatment device, which is suitable for storing zinc-containing materials and obtaining a zinc-containing material mixture by mixing with zinc-containing acid electrolysis waste liquid, and the pretreatment device is located upstream of the reactor and is connected to the first feed port of the reactor.

[0007] In some embodiments, the first air inlet, the first air outlet, and the first feed inlet of the reactor are all disposed on the top of the reactor.

[0008] According to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: a gas storage tank, which is located upstream of the reactor, the gas storage tank is suitable for storing reducing gas, the gas storage tank has a second gas outlet, and the second gas outlet is connected to the first gas inlet of the reactor.

[0009] Furthermore, the production line for reduction leaching of zinc-containing materials further comprises: a pressure reducing valve, which is arranged between the second air outlet and the first air inlet.

[0010] According to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: an exhaust gas treatment device, which is located downstream of the reactor and is connected to the first gas outlet of the reactor. The exhaust gas treatment device is suitable for purifying the exhaust gas flowing into it and then discharging it.

[0011] In some embodiments, the zinc-containing material reduction leaching production line further includes: a heat exchange unit, which is suitable for exchanging heat with the reactor.

[0012] Furthermore, the heat exchange unit includes: a water tank and a heat exchange tube, the heat exchange tube has a heat exchange channel, both ends of the heat exchange tube are respectively connected to the water tank, at least part of the heat exchange tube is arranged at the bottom and periphery of the reactor, and is suitable for heat exchange with the reactor.

[0013] According to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials further includes: a pressure detection component, which is arranged in the reactor and is suitable for detecting the pressure of the gas in the reactor.

[0014] Furthermore, the production line for reduction leaching of zinc-containing materials further comprises: a temperature detecting component, which is arranged in the reactor and is suitable for detecting the temperature inside the reactor.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a diagram of a production line device for reduction leaching of zinc-containing materials according to some embodiments of the present application;

[0018] Figure 2 This is a process flow chart of a production line for reduction leaching of zinc-containing materials according to some embodiments of the present application.

[0019] Reference numerals:

[0020] 1. Reactor; 1a. First gas outlet; 11. Drive motor;

[0021] 2. Solid-liquid separation device;

[0022] 3. Pretreatment device;

[0023] 4. Gas storage tank; 4a. Second gas outlet;

[0024] 5. Pressure reducing valve;

[0025] 6. Exhaust gas treatment device;

[0026] 71a, first water tank; 71b, second water tank; 72, heat exchange tube;

[0027] 81. Pressure detection component; 82. Temperature detection component;

[0028] 91. First pipeline; 92. Second pipeline; 93. Third pipeline; 94. Fourth pipeline. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0031] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0033] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0034] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0037] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0038] The term "plurality" used in this application refers to two or more (including two).

[0039] Reference below Figure 1 and Figure 2 The present invention describes a production line for reduction leaching of zinc-containing materials according to an embodiment of the present application.

[0040] like Figure 1 As shown, according to some embodiments of the present application, a production line for reduction leaching of zinc-containing materials includes: a reactor 1 and a solid-liquid separation device 2.

[0041] Among them, the reactor 1 is suitable for accommodating a zinc-containing material mixture. The reactor 1 has a first air inlet, a first air outlet 1a, a first feed port and a first discharge port. The first air inlet is suitable for introducing a reducing gas and performing a reduction leaching reaction with the zinc-containing material mixture; the solid-liquid separation device 2 is arranged downstream of the reactor 1 and connected to the first discharge port. The solid-liquid separation device 2 is used to perform solid-liquid separation on the product of the reactor 1.

[0042] Specifically, a accommodating chamber can be formed in the reactor 1, and materials such as a zinc-containing material mixture can be accommodated in the accommodating chamber and undergo chemical reactions in the accommodating chamber. The reactor 1 isolates the materials in the accommodating chamber from the external environment and can provide the environment required for the chemical reaction of the materials to ensure that the chemical reaction of the materials in the accommodating chamber is safe, efficient, and accurate. The first air inlet and the first air outlet 1a of the reactor 1 can be arranged at intervals in the circumference of the reactor 1. The first air inlet and the first air outlet 1a can connect the accommodating chamber with the outside world or other cavities. The first air inlet is used to introduce a reducing gas (such as sulfur dioxide gas) into the accommodating chamber. The reducing gas and the zinc-containing material mixture undergo a chemical reaction under preset reaction temperature, pressure, etc., to generate solid reducing leaching residue and liquid reducing leaching solution, thereby achieving efficient leaching of zinc elements and enrichment of other valuable metals. The first air outlet 1a can be used to discharge the exhaust gas after the reaction for centralized treatment and environmentally friendly discharge of the exhaust gas. The reactor 1 is further provided with a first feed port and a first discharge port. The first feed port can be used to add a zinc-containing material mixture into the reactor 1. By precisely controlling the feeding amount and feeding speed, the stability and efficiency of the reaction can be ensured. The first discharge port can be used to discharge the product after the reaction, that is, a mixture of reduced leaching liquid and reduced leaching residue. The solid-liquid separation device 2 is arranged downstream of the reactor 1 and connected to the first discharge port of the reactor 1. The solid-liquid separation device 2 can perform solid-liquid separation on the product of the reactor 1, thereby obtaining pure reduced leaching liquid and reduced leaching residue.

[0043] The solid-liquid separation device 2 can adopt separation technology such as sedimentation separation and centrifugal separation to ensure the optimization of the separation effect. The reduced leaching liquid after separation can be directly sent to the valuable metal recovery workshop for further processing, and the reduced leaching residue can be subjected to high acid leaching or other appropriate subsequent treatments. For example, Figure 2 As shown in the figure, the iron element in the reduced leaching residue can be used to produce high-quality iron concentrate through the hematite method, thereby realizing the resource utilization of iron, while valuable metals such as lead in the reduced leaching residue can be enriched to varying degrees.

[0044] It should be noted that the aforementioned zinc-containing material mixture refers to a mixture formed by mixing a zinc-containing material with electrolytic waste liquid. The zinc-containing material is obtained by reprocessing industrial zinc-containing dust (mud) (including but not limited to secondary zinc oxide powder, rotary hearth furnace ash, electric furnace ash, etc.), and the filter residue obtained by solid-liquid separation after neutral leaching or low-acid leaching of the zinc-containing dust is the zinc-containing material. Typically, the zinc-containing material contains zinc, iron, and lead. In some embodiments, the zinc-containing material has a zinc content of 5% to 18%, an iron content of 3% to 15%, and a lead content of 5% to 10%.

[0045] In addition, the above-mentioned reducing gas is constructed as sulfur dioxide gas. Under relatively low temperature and relatively low pressure conditions, sulfur dioxide can chemically react with the zinc-containing material mixture to reduce the valuable metal elements in the zinc-containing material mixture to the reduced leaching residue and the reduced leaching liquid. The addition of sulfur dioxide gas enables the entire leaching process to react at a relatively low temperature and relatively low pressure, and the reaction is fast and efficient.

[0046] According to the production line for reduction leaching of zinc-containing materials of the present application, the reactor 1 and the solid-liquid separation device 2 can be used in conjunction to form a production process in which reduction leaching is performed in the reactor 1 and solid-liquid separation is performed in the solid-liquid separation device 2. In addition, sulfur dioxide gas is used as the reducing gas in the process, so that the leaching reaction can be completed at a relatively low temperature and pressure, thereby avoiding the use of harsh reaction conditions such as high temperature and high pressure, saving production energy consumption and equipment investment, and at the same time, reducing the time required for the reaction and enhancing the leaching effect, so that valuable elements can be efficiently leached and enriched, thereby improving production efficiency and providing high-quality raw materials for subsequent process flows, thereby realizing the high value and resource utilization of valuable metals.

[0047] In addition, in some specific embodiments of the present application, an agitator is provided within the reactor 1, and a drive motor 11 is provided at the top of the reactor 1. The output shaft of the drive motor 11 is connected to the agitator. The drive motor 11 can selectively drive the agitator to rotate to stir the materials within the reactor 1, thereby ensuring sufficient contact and uniform mixing of the materials, which is conducive to improving reaction efficiency and effect. In some embodiments, the reactor 1 can be constructed as a magnetic stirring autoclave, which drives the agitator to rotate via a magnetic coupling to achieve mixing and reaction of the materials, which can improve leakage resistance and improve reaction reliability and safety.

[0048] like Figure 1 As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: a pretreatment device 3, which is suitable for storing zinc-containing materials and obtaining a zinc-containing material mixture by mixing with zinc-containing acid electrolysis waste liquid. The pretreatment device 3 is located upstream of the reactor 1 and is connected to the first feed port of the reactor 1.

[0049] Specifically, pretreatment device 3 is located upstream of reactor 1. Within pretreatment device 3, the zinc-containing material can be mixed with zinc-containing acid electrolysis wastewater at a predetermined solid-liquid ratio to produce the zinc-containing material mixture required for the reaction. The zinc-containing acid electrolysis wastewater has a relatively high acidity and a certain zinc content. By mixing with the zinc-containing material, it provides the necessary acidity and zinc source for reduction leaching of the zinc-containing material. Therefore, the provision of pretreatment device 3 ensures that the zinc-containing material and zinc-containing acid electrolysis wastewater are thoroughly mixed, creating favorable conditions for subsequent reaction processes. Pretreatment device 3 can be connected to the first feed port of reactor 1, and the resulting zinc-containing material mixture can be delivered to reactor 1 for subsequent reaction and processing.

[0050] It should be noted that the preset solid-liquid ratio of the above-mentioned zinc-containing material to the zinc-containing acid electrolytic waste liquid is set in the range of 4 to 6. For example, the solid-liquid ratio of the zinc-containing material to the zinc-containing acid electrolytic waste liquid can be constructed as 4, 5 or 6, etc.; the above-mentioned zinc-containing acid electrolytic waste liquid refers to an electrolytic waste liquid with relatively high acidity and a certain zinc content. The acidity of the zinc-containing acid electrolytic waste liquid is set in the range of 140 to 170 g / L, and the zinc content in the zinc-containing acid electrolytic waste liquid is set in the range of 40 to 50 g / L. For example, in some embodiments, the zinc-containing acid electrolytic waste liquid can be constructed to contain 45 g / L zinc and 157 g / L acid. In other embodiments, the zinc-containing acid electrolytic waste liquid can also be constructed to contain 50 g / L zinc and 160 g / L acid. In some other embodiments, the zinc-containing acid electrolytic waste liquid can also be constructed to contain 48 g / L zinc and 162 g / L acid, etc.

[0051] like Figure 1 As shown, according to some embodiments of the present application, the first air inlet, the first air outlet 1a and the first feed inlet of the reactor 1 are all arranged at the top of the reactor 1.

[0052] Specifically, the first air inlet and the first air outlet 1a of the reactor 1 are both arranged at the top of the reactor 1 to facilitate the introduction of reducing gas (sulfur dioxide gas) and the discharge of exhaust gas after the reaction. The first feed port of the reactor 1 is used for feeding. The first feed port is also arranged at the top of the reactor 1, and its projection in the height direction of the reactor 1 is located between the first air inlet and the first air outlet 1a. In this way, the material can smoothly enter the reactor 1 from the top of the reactor 1, and fully contact and react with the introduced reducing gas during the reaction process, which can improve the reaction efficiency and product quality.

[0053] It is understandable that the first air inlet, the first air outlet 1a and the first feed port are all spaced apart to ensure that the feeding, air intake and air outlet do not interfere with each other, so as to ensure the accurate progress of the chemical reaction in the reactor 1.

[0054] like Figure 1As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: a gas storage tank 4, the gas storage tank 4 is located upstream of the reactor 1, the gas storage tank 4 is suitable for storing reducing gas, the gas storage tank 4 has a second gas outlet 4a, and the second gas outlet is connected to the first gas inlet of the reactor 1.

[0055] Specifically, the gas tank 4 is located upstream of the reactor 1. The gas tank 4 may have a gas storage cavity therein, which can store reducing gas (sulfur dioxide gas). The gas tank 4 has a second gas inlet. In some embodiments, the second gas inlet is provided at the top of the gas tank 4. The second gas outlet 4a may be in communication with the gas storage cavity, and the second gas outlet is in communication with the first gas inlet of the reactor 1. Thus, the gas tank 4 can stably and continuously supply gas for the reduction leaching reaction process in the reactor 1. By providing the gas tank 4, effective management and control of the reducing gas can be achieved, such as adjustment of gas flow rate, pressure and other parameters. This helps ensure that the reduction leaching reaction in the reactor 1 can be carried out under optimal conditions, thereby improving reaction efficiency and product quality.

[0056] like Figure 1 As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials further includes: a pressure reducing valve 5, which is arranged between the second air outlet and the first air inlet.

[0057] Specifically, the pressure reducing valve 5 can be provided on the pipeline between the second gas outlet of the gas storage tank 4 and the first gas inlet of the reactor 1. The pressure reducing valve 5 has the function of reducing the gas pressure, and can adjust the pressure of the reducing gas so that the reducing gas can enter the reactor 1 at an appropriate pressure to meet the preset pressure conditions of the chemical reaction in the reactor 1, thereby ensuring good reaction efficiency and product quality. In some embodiments, the pressure reducing valve 5 can include components such as a valve body, a valve core, a spring, and a pressure gauge. The pressure reducing effect of the pressure reducing valve 5 can be achieved based on the balance between the spring force and the gas pressure. When the gas flows from the high-pressure end (such as the second gas outlet of the gas storage tank 4) to the low-pressure end (such as the first gas inlet of the reactor 1), the valve core of the pressure reducing valve 5 is subjected to the pressure of the gas. At this time, the spring force and the gas pressure interact. By adjusting the preload of the spring or the opening size of the valve core, the gas pressure after passing through the pressure reducing valve 5 can be controlled to be stable within a preset value range. By introducing the pressure reducing valve 5, precise control of the pressure of the reducing gas can be achieved, further improving the reaction efficiency and product quality. In addition, the introduction of the pressure reducing valve 5 is also conducive to enhancing the safety and stability of the production line.

[0058] like Figure 1As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials also includes: an exhaust gas treatment device 6, which is located downstream of the reactor 1 and is connected to the first gas outlet 1a of the reactor 1. The exhaust gas treatment device 6 is suitable for purifying the exhaust gas flowing into it and then discharging it.

[0059] Specifically, the tail gas treatment device 6 is located downstream of the reactor 1 and is connected to the first gas outlet 1a of the reactor 1, so that the tail gas after the reaction in the reactor 1 can flow into the tail gas treatment device 6 through the first gas outlet 1a. During the reduction leaching process of the zinc-containing material mixture, the tail gas generated in the reactor 1 may contain harmful substances, such as incompletely reacted sulfur dioxide gas, byproduct gases generated by the reaction, and other possible pollutants. The tail gas treatment device 6 can convert the harmful substances in the tail gas into harmless substances or separate the harmful substances from the tail gas through physical, chemical, or biological methods, thereby achieving the purpose of purifying the tail gas. By introducing the tail gas treatment device 6 to purify the tail gas and properly discharge it, the environmental protection and sustainability of the production line can be improved.

[0060] It should be pointed out that the exhaust gas treatment device 6 in the embodiment of the present application is constructed to purify the exhaust gas by chemical methods. For example, the exhaust gas treatment device 6 can contain a sodium hydroxide solution. When the exhaust gas passes through the exhaust gas treatment device 6 filled with sodium hydroxide solution, the acidic gas in the exhaust gas (such as sulfur dioxide gas and by-product gas generated by the reaction) can react chemically with the sodium hydroxide to generate harmless salts and water, thereby achieving purification treatment.

[0061] In addition, in some specific embodiments of the present application, a first pipe 91 is provided between the solid-liquid separation device 2 and the first discharge port of the reactor 1, a second pipe 92 is provided between the pretreatment device 3 and the first feed port of the reactor 1, a third pipe 93 is provided between the second gas outlet 4a of the gas storage tank 4 and the first gas inlet of the reactor 1, and a fourth pipe 94 is provided between the tail gas treatment device 6 and the first gas outlet 1a of the reactor 1, so as to form a continuous production process of material mixing pretreatment, reduction leaching, product solid-liquid separation and tail gas purification and emission, so as to improve the continuity and efficiency of the production line.

[0062] like Figure 1 As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials further includes: a heat exchange unit, which is suitable for exchanging heat with the reactor 1.

[0063] Specifically, the heat exchange unit can be constructed as a structure directly or indirectly connected to the reactor 1. For example, for a direct connection, the heat exchange unit can be constructed to be directly embedded in the wall of the reactor 1 to form a jacketed heat exchanger. For an indirect connection, the heat exchange unit can be connected to the reactor 1 through a pipeline to form an independent heat exchange system. The heat exchange unit can transfer the heat generated by the reactor 1 to a cooling medium (such as cooling water, air, etc.) through heat exchange to achieve heat dissipation and cooling of the reactor 1 and precise control of the temperature of the reactor 1. In this way, it can be ensured that the reaction process is carried out under appropriate process conditions, improve the quality and output of the product, and recover the heat generated by the reactor 1, which can be used for other process steps or preheating raw materials, thereby improving energy utilization efficiency. At the same time, timely heat dissipation and cooling are conducive to extending the life of the reactor 1 and saving maintenance costs.

[0064] like Figure 1 As shown, according to some embodiments of the present application, the heat exchange unit includes: a water tank and a heat exchange tube 72, wherein the heat exchange tube 72 has a heat exchange flow channel, and both ends of the heat exchange tube 72 are respectively connected to the water tank, and at least a portion of the heat exchange tube 72 is arranged at the bottom and periphery of the reactor 1, and is suitable for heat exchange with the reactor 1.

[0065] Specifically, the water tank can be constructed as one or more, and the water tank can be used to store and circulate a cooling medium (such as water, etc.); the heat exchange tube 72 has a certain length, and the heat exchange tube 72 is connected to the water tank. The cooling medium can circulate between the water tank and the heat exchange channel. At least a portion of the heat exchange tube 72 is in contact with the reactor 1. The heat exchange tube 72 can guide and transport the cooling medium in the water tank to the reactor 1 area and perform heat exchange with the reactor 1. Moreover, after the heat exchange, the heat exchange tube 72 can guide the heat-exchanged cooling medium into the water tank for circulating cooling. Among them, at least a portion of the heat exchange tube 72 is arranged at the bottom and periphery of the reactor 1. In this way, the heat exchange area between the heat exchange channel and the reactor 1 can be expanded, and the heat exchange efficiency and effect can be improved. At the same time, this layout can also reduce the pressure gradient inside the reactor 1, which is conducive to the uniform mixing and reaction of the materials.

[0066] It is understandable that the heat exchange tube 72 can be constructed in a curved shape, a straight shape, or a combination of a curved and a straight shape to improve the shape compatibility of the heat exchange tube 72 and the reactor 1 and ensure the heat exchange efficiency and effect.

[0067] In addition, in some specific embodiments of the present application, the water tank includes a first water tank 71a and a second water tank 71b, and the heat exchange flow channel includes a first flow channel section, a second flow channel section and a third flow channel section connected in sequence, wherein the end of the first flow channel section away from the second flow channel section is connected to the first water tank 71a, the second flow channel section is arranged at the bottom and periphery of the reactor 1, and the end of the third flow channel section away from the second flow channel section is connected to the second water tank 71b. By setting the first water tank 71a, the second water tank 71b, the first flow channel section, the second flow channel section and the third flow channel section, a heat exchange unit is formed that combines a double water tank (the first water tank 71a and the second water tank 71b) with a three-section heat exchange flow channel (the first flow channel section, the second flow channel section and the third flow channel section). During the heat exchange process, the cooling medium can flow from the first water tank 71a into the first flow channel section, and enter the second flow channel section after pre-cooling treatment. In the second flow channel section, the cooling medium exchanges heat with the reactor 1, absorbs and takes away the heat of the reactor 1, and then, the cooling medium enters the third flow channel section and finally flows into the second water tank 71b. In this way, the heat exchange unit can achieve precise control of the temperature of the reactor 1 while ensuring a stable supply and recycling of the medium.

[0068] like Figure 1 As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials further includes: a pressure detection component 81, which is arranged in the reactor 1 and is suitable for detecting the pressure of the gas in the reactor 1.

[0069] Specifically, the pressure sensing element 81 can be disposed in the top region of the reactor 1. The pressure sensing element 81 can sense and measure changes in the pressure of the gas (sulfur dioxide) within the reactor 1. The pressure sensing element 81 can convert the pressure signal into an electrical signal and transmit it to the control system for real-time monitoring and adjustment. This allows precise control of the pressure of the gas within the reactor 1, ensuring that the reaction proceeds under optimal conditions, thereby improving product quality and yield. For example, the partial pressure of the sulfur dioxide gas within the reactor 1 is controlled within the range of 0.1 to 0.15 MPa to ensure a good reduction leaching effect.

[0070] like Figure 1 As shown, according to some embodiments of the present application, the production line for reduction leaching of zinc-containing materials further includes: a temperature detection component 82, which is disposed in the reactor 1 and is suitable for detecting the temperature inside the reactor 1.

[0071] Specifically, the temperature detection element 82 can be set in the top area of ​​the reactor 1. The temperature detection element 82 can be a high-precision temperature measuring element such as a thermistor, a thermocouple or an infrared temperature sensor. The temperature detection element 82 can sense and measure the change in the temperature of the reactor 1, and convert the temperature signal into an electrical signal and transmit it to the control system for real-time monitoring and adjustment. In this way, the temperature in the reactor 1 can be controlled to ensure that the reduction leaching reaction is carried out within a preset temperature range, thereby improving production efficiency and product quality. For example, when the reaction temperature is controlled to be 75°C to 95°C, sulfur dioxide gas is introduced into the reactor 1 to carry out the reduction leaching reaction. The reduction leaching reaction time is controlled to be within the range of 2 to 3 hours. The reduction leaching liquid and the reduction leaching residue are obtained by solid-liquid separation in the solid-liquid separation device 2. The reduction leaching residue contains less than 2% zinc, 1% to 10% iron, and 10% to 35% lead. The initial acidity of sulfur dioxide reduction leaching is controlled within the range of 80 to 110 g / L, and the end point acidity is controlled within the range of 10 to 25 g / L to ensure a good reduction leaching effect.

[0072] By introducing the pressure detection element 81 and the temperature detection element 82, the production line for reduction leaching of zinc-containing materials can achieve real-time monitoring and control of the pressure and temperature inside the reactor 1, which helps to ensure that the reaction is carried out under optimal conditions and improve the quality and output of the product. At the same time, it can also promptly detect and handle potential faults or abnormal situations, thereby improving the stability and safety of the production line.

[0073] In addition, in some specific embodiments of the present application, the zinc-containing material is a leaching residue containing 18% zinc, 10% iron, and 8% lead obtained by leaching secondary zinc oxide powder. The leaching residue (i.e., the zinc-containing material) is mixed with zinc-containing acid electrolysis waste liquid containing 45 g / L zinc and 157 g / L acid at a liquid-solid ratio of 5:1 and added to the reactor 1. The initial acidity is 110 g / L. When the reaction temperature reaches 75°C, sulfur dioxide gas is introduced and the pressure of the sulfur dioxide gas is controlled to 0.1 MPa. After reacting for 3 hours, the solid and liquid are separated to obtain a reduction leaching residue and a reduction leaching liquid. The reduction leaching residue contains 1.12% zinc, 1.05% iron, and 20.05% lead; the reduction leaching liquid contains 75.97 g / L zinc, 18.22 g / L iron, 0.2 g / L trivalent iron, and 18.78 g / L acid. It can achieve a zinc leaching rate of 93.79%, an iron leaching rate of 90.95%, and a lead enrichment of 2.5 times.

[0074] In other specific embodiments of the present application, the zinc-containing material is a leaching residue containing 11.72% zinc, 13.55% iron, and 8.58% lead obtained by leaching rotary hearth furnace ash. The leaching residue (i.e., the zinc-containing material) is mixed with zinc-containing acid electrolysis waste liquid containing 50 g / L zinc and 160 g / L acid at a liquid-solid ratio of 6:1 and added to the reactor 1. The initial acidity is 95 g / L. When the reaction temperature reaches 95°C, sulfur dioxide gas is introduced and the pressure of the sulfur dioxide gas is controlled to 0.12 MPa. After reacting for 2.5 hours, the solid and liquid are separated to obtain a reduction leaching residue and a reduction leaching liquid. The reduction leaching residue contains 1.03% zinc, 1.26% iron, and 33.82% lead; the reduction leaching liquid contains 69.53 g / L zinc, 20.15 g / L iron, 1.8 g / L trivalent iron, and 22.06 g / L acid. The zinc leaching rate can reach 91.21%, the iron leaching rate can reach 90.56%, and the lead enrichment can reach 3.9 times.

[0075] In some other specific embodiments of the present application, the zinc-containing material is a leaching residue containing 14.42% zinc, 17.5% iron, and 1.22% lead obtained by leaching electric furnace ash. The leaching residue (i.e., the zinc-containing material) is mixed with zinc-containing acid electrolysis waste liquid containing 48 g / L zinc and 162 g / L acid at a liquid-solid ratio of 4:1 and added to the reactor 1. The initial acidity is 85 g / L. When the reaction temperature reaches 90°C, sulfur dioxide gas is introduced and the pressure of the sulfur dioxide gas is controlled to be 0.15 MPa. After reacting for 2 hours, the solid and liquid are separated to obtain a reduction leaching residue and a reduction leaching liquid. The reduction leaching residue contains 1.13% zinc, 1.90% iron, and 3.82% lead; the reduction leaching liquid contains 84.05 g / L zinc, 39 g / L iron, 1.3 g / L trivalent iron, and 25.06 g / L acid. The zinc leaching rate can reach 91.21%, the iron leaching rate can reach 89.14%, and the lead enrichment can be 3 times.

[0076] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A production line for reduction leaching of zinc-containing materials, characterized in that: include: A reactor (1), wherein the reactor (1) is suitable for accommodating a zinc-containing material mixture, wherein a accommodating cavity is formed in the reactor (1), and the reactor (1) further comprises a first air inlet, a first air outlet (1a), a first feed port, and a first discharge port, which are communicated with the accommodating cavity, wherein the first air inlet is suitable for introducing a reducing gas and performing a reduction leaching reaction with the zinc-containing material mixture; A solid-liquid separation device (2) is provided downstream of the reactor (1) and connected to the first discharge port. The solid-liquid separation device (2) is used for performing solid-liquid separation on the product of the reactor (1).

2. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: Also includes: A pretreatment device (3) is provided, wherein the pretreatment device (3) is suitable for storing zinc-containing materials and obtaining a zinc-containing material mixture by mixing with zinc-containing acid electrolysis waste liquid. The pretreatment device (3) is located upstream of the reactor (1) and is connected to the first feed port of the reactor (1).

3. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: The first air inlet, the first air outlet (1a) and the first feed inlet of the reactor (1) are all arranged at the top of the reactor (1).

4. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: Also includes: A gas storage tank (4), the gas storage tank (4) is located upstream of the reactor (1), the gas storage tank (4) is suitable for storing reducing gas, the gas storage tank (4) has a second gas outlet (4a), and the second gas outlet (4a) is connected to the first gas inlet of the reactor (1).

5. The production line for reduction leaching of zinc-containing materials according to claim 4, characterized in that: Also includes: A pressure reducing valve (5), the pressure reducing valve (5) is arranged between the second air outlet and the first air inlet.

6. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: Also includes: An exhaust gas treatment device (6) is located downstream of the reactor (1) and is connected to the first gas outlet (1a) of the reactor (1). The exhaust gas treatment device (6) is suitable for purifying the exhaust gas flowing into it and then discharging it.

7. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: Also includes: A heat exchange unit, wherein the heat exchange unit is suitable for exchanging heat with the reactor (1).

8. The production line for reduction leaching of zinc-containing materials according to claim 7, characterized in that: The heat exchange unit comprises: a water tank and a heat exchange tube (72), wherein the heat exchange tube (72) has a heat exchange flow channel, and both ends of the heat exchange tube (72) are respectively connected to the water tank. At least a portion of the heat exchange tube (72) is arranged at the bottom and periphery of the reactor (1) and is suitable for heat exchange with the reactor (1).

9. The production line for reduction leaching of zinc-containing materials according to claim 1, characterized in that: Also includes: A pressure detection component (81), the pressure detection component (81) is arranged on the reactor (1) and is suitable for detecting the pressure of the gas in the reactor (1).

10. The production line for reduction leaching of zinc-containing materials according to claim 9, characterized in that: Also includes: A temperature detecting component (82) is provided in the reactor (1) and is suitable for detecting the temperature in the reactor (1).

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