Method for extracting sulfur from waste residue

Abstract

The application provides a waste residue sulfur extraction method, and belongs to the technical field of solid waste treatment. The method comprises the following steps: obtaining characteristic particle size information and initial sulfur content information of waste residue, and pretreating the waste residue; determining the proportion of leaching agent according to the characteristic particle size information and the initial sulfur content information, and preparing the leaching agent; putting the pretreated waste residue and the prepared leaching agent into a reaction kettle to perform leaching reaction; obtaining real-time potential information of the reaction system during the reaction, and dynamically adjusting the stirring speed and the reaction time length based on the real-time potential information; performing solid-liquid separation on the mixed system after leaching to obtain sulfur-containing liquid and leaching residue; extracting sulfur from the sulfur-containing liquid; and modifying the leaching residue. The method effectively solves the problem that only single sulfur extraction link parameter control is focused on in the prior art, improves the stability of the sulfur extraction efficiency, improves the modification effect of the residue, and makes the whole sulfur extraction process more coherent and more in line with the actual needs of waste residue resource disposal in industrial production.

Description

Technical Field

[0001] This invention belongs to the technical field of solid waste treatment, and more specifically, relates to a method for sulfur extraction from waste residue. Background Technology

[0002] Industrial production processes generate large amounts of sulfur-containing waste residues, such as metallurgical and chemical waste residues. Directly dumping or landfilling this waste not only wastes sulfur resources but also risks causing soil and water pollution due to rainwater leaching and sulfur migration. Furthermore, the resource-based disposal of sulfur-containing waste residues requires a balance between efficient sulfur recovery and the secondary utilization of the residues. Existing sulfur extraction methods often focus on parameter control at a single extraction stage, lacking coordinated control over the entire process, including leaching, separation, residue modification, and leaching agent regeneration. This results in problems such as unstable sulfur extraction efficiency, poor residue modification, high leaching agent consumption, and process logic breaks.

[0003] Existing sulfur extraction methods suffer from the following drawbacks: Traditional methods rely solely on empirically determined particle size and leaching agent ratios, failing to dynamically adjust based on the initial sulfur content and particle size distribution of the waste residue. This leads to incomplete leaching reactions. Sulfur-containing waste residues from different sources and batches exhibit significant variations in initial sulfur content and characteristic particle size. Determining the target particle size based solely on fixed empirical values ​​can result in problems such as insufficient specific surface area of ​​the waste residue and inadequate contact between the leaching agent and sulfur when the particle size is too large, or a surge in stirring energy consumption and increased difficulty in subsequent solid-liquid separation when the particle size is too small. This empirical parameter setting model makes the leaching stage the efficiency bottleneck of the entire sulfur extraction process. It not only directly leads to insufficient sulfur resource recovery but also, due to fluctuations in the sulfur concentration of the leachate and instability in the residual sulfur content, further affects the parameter compatibility of subsequent separation and residue modification processes, creating a chain of negative consequences. Summary of the Invention

[0004] The purpose of this invention is to provide a method for sulfur extraction from waste residue, which aims to solve the problem that in existing waste residue sulfur extraction methods, the crushing particle size and leaching agent ratio are set only based on experience and are not dynamically adjusted in conjunction with the initial sulfur content and particle size distribution of the waste residue.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a method for sulfur extraction from waste residue, comprising: Obtain characteristic particle size information and initial sulfur content information of the waste residue, and pretreat the waste residue; The leaching agent ratio is determined and the leaching agent is prepared based on the characteristic particle size information and the initial sulfur content information; The pretreated waste residue and the prepared leaching agent are put into the reaction vessel to carry out the leaching reaction; During the reaction process, real-time potential information of the reaction system is obtained, and the stirring rate and reaction time are dynamically adjusted based on the real-time potential information. The leaching mixture was subjected to solid-liquid separation to obtain a sulfur-containing solution and leaching residue. Extract sulfur from the sulfur-containing solution; The leaching residue is modified.

[0006] In one possible implementation, obtaining the characteristic particle size information and initial sulfur content information of the waste residue, and pretreating the waste residue, includes: The optimal crushing particle size is determined based on the characteristic particle size information and the initial sulfur content information; The waste residue is crushed according to the optimal crushing particle size to obtain pretreated waste residue.

[0007] In one possible implementation, the step of adding the pretreated waste residue and the prepared leaching agent into a reactor for leaching reaction includes: The initial stirring rate is determined based on the optimal crushing particle size. The pretreated waste residue is added to the reactor in proportion, and then the prepared leaching agent is slowly added. Stirring is started at the initial stirring rate to initiate the leaching reaction.

[0008] In one possible implementation, acquiring real-time potential information of the reaction system during the reaction process, and dynamically adjusting the stirring rate and reaction time based on the real-time potential information, includes: To obtain real-time potential information of the reaction system during the reaction process; Determine whether the real-time potential information deviates from the preset potential range, and decide whether to adjust the stirring rate based on the determination result.

[0009] In one possible implementation, determining whether to adjust the stirring rate based on the judgment result includes: If the real-time potential information deviates from the potential range, the stirring rate is re-determined based on the real-time potential information; if the real-time potential information does not deviate from the potential range, the stirring rate is not adjusted.

[0010] In one possible implementation, the extraction of sulfur from the sulfur-containing liquid includes: Obtain the initial sulfur concentration information in the sulfur-containing liquid; The initial flow rate of the ion exchange column is determined based on the initial sulfur concentration information, and sulfur in the sulfur-containing solution is enriched starting at the initial flow rate of the ion exchange column, thereby obtaining a sulfur-enriched solution and a sulfur-poor solution.

[0011] In one possible implementation, the extraction of sulfur from the sulfur-containing liquid further includes: Obtain real-time sulfur concentration information in the sulfur-containing liquid; The flow rate of the ion exchange column is adjusted based on the real-time sulfur concentration information.

[0012] In one possible implementation, the extraction of sulfur from the sulfur-containing liquid further includes: The concentration of the leaching agent in the sulfur-poor solution was determined; The amount of leaching agent to be added is calculated based on the leaching agent concentration information and the target leaching agent concentration information; The leaching agent is added to the sulfur-poor solution according to the specified amount of leaching agent to facilitate the preparation of a regenerated leaching agent.

[0013] In one possible implementation, the modification treatment of the leaching residue includes: The silica content and residual sulfur content in the leaching residue were determined. The mineral powder ratio and the cementitious material ratio are determined based on the silica content and the residual sulfur content. The leaching residue, mineral powder, and cementing materials are mixed in a specific ratio to form a slurry. The slurry is poured into a mold and placed in an aging chamber for aging.

[0014] In one possible implementation, pouring the slurry into a mold and placing it in an aging tank for aging includes: The aging temperature is determined based on the remaining sulfur content. The slurry is poured into a mold and placed in an aging chamber, and aged for 28 days at the aging temperature.

[0015] The beneficial effects of the waste residue sulfur extraction method provided by the present invention are as follows: Compared with the prior art, the waste residue sulfur extraction method of the present invention first obtains the characteristic particle size information and initial sulfur content information of the waste residue and performs pretreatment, so that the subsequent process can be carried out based on the actual characteristics of the waste residue, avoiding the problem that the parameter settings in the past were divorced from the actual situation of the waste residue.

[0016] Based on the characteristic particle size and initial sulfur content of the waste residue, the leaching agent ratio was determined and the leaching agent was prepared. This ensured that the composition of the leaching agent precisely matched the form and content of sulfur in the waste residue, improving the reactivity of the leaching agent with sulfur and reducing ineffective consumption of the leaching agent. The pretreated waste residue and the prepared leaching agent were then added to the reactor for leaching, providing a suitable reaction environment for the separation of sulfur from the waste residue and ensuring the smooth start of the leaching reaction.

[0017] Real-time potential information of the reaction system is acquired during the reaction process, and the stirring rate and reaction time are dynamically adjusted based on this information. This allows for real-time adaptation to changes in the reaction system, ensuring that the reaction is always in a state conducive to sulfur leaching and avoiding insufficient leaching or excessive energy consumption due to fixed reaction conditions. Solid-liquid separation is then performed on the leached mixture to obtain a sulfur-containing solution and leaching residue, achieving preliminary separation of sulfur from the solid waste component and laying the foundation for subsequent sulfur extraction and residue treatment.

[0018] Extracting sulfur from sulfur-containing solutions allows for the separation of sulfur resources from the liquid, enabling their recycling and improving resource utilization. Modifying the leaching residue alters its properties, making it suitable for secondary use and avoiding the environmental burden caused by direct disposal, thus achieving full-process resource-based disposal of waste.

[0019] The entire process, through the coordinated efforts of each stage, forms a complete system from waste residue pretreatment to sulfur extraction and residue modification. This effectively solves the problem of focusing only on parameter control of a single sulfur extraction stage in the past, improves the stability of sulfur extraction efficiency, enhances the residue modification effect, reduces the consumption of leaching agent, and makes the entire sulfur extraction process more logical and more in line with the actual needs of waste residue resource utilization in industrial production. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the main steps of the waste residue sulfur extraction method provided in the embodiments of the present invention; Figure 2 This is a schematic flowchart of the waste residue sulfur extraction method provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the process for extracting sulfur from sulfur-containing liquid according to an embodiment of the present invention. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0024] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0025] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0027] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," and "above" are used here to describe the spatial positional relationship between a device or feature and other devices or features, as shown in the figure. It should be understood that spatial relative terms are intended to... The invention includes different orientations of the device in use or operation, in addition to those described in the figures. For example, if a device in the figures is inverted, a device described as "above" or "on top of" other devices or structures will be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatial relative descriptions used herein are interpreted accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" means two or more, and "a number" means one or more, unless otherwise explicitly specified.

[0029] Reference Figures 1 to 3 The present invention will now describe the method for sulfur extraction from waste residue.

[0030] The method for sulfur removal from waste residue includes obtaining characteristic particle size information and initial sulfur content information of the waste residue, and pre-treating the waste residue; S100. Determine the leaching agent ratio and prepare the leaching agent based on the characteristic particle size information and the initial sulfur content information.

[0031] In one possible implementation, step S100 involves obtaining characteristic particle size information and initial sulfur content information of the waste residue, and pre-treating the waste residue, including: S110. Determine the optimal crushing particle size based on characteristic particle size information and initial sulfur content information.

[0032] First, 3-5 original waste residue samples were randomly selected from the waste residue, each weighing no less than 500g. The sulfur content of the samples was detected using a high-frequency infrared carbon-sulfur analyzer, and the average value was taken as the initial sulfur content information. The particle size distribution of the samples was detected using a laser particle size analyzer to obtain the proportion of particles in different size ranges and determine the characteristic particle size information.

[0033] The optimal crushing particle size is calculated using the following formula:

[0034] in, To achieve the optimal crushing particle size; For characteristic particle size information; This is the particle size correction factor; This is the initial sulfur content information.

[0035] in The value range is 1.2-1.8.

[0036] S120. The waste residue is crushed according to the optimal crushing particle size to obtain pretreated waste residue.

[0037] A combination of jaw crusher and ball mill is used to crush the raw waste to the optimal particle size. After crushing, a vibrating screen is used to remove particles that exceed the specified size. The range of particles ensures uniform particle size.

[0038] S200. The pretreated waste residue and the prepared leaching agent are put into the reactor for leaching reaction.

[0039] In one possible implementation, step S200 involves adding the pretreated waste residue and the prepared leaching agent into a reaction vessel to carry out a leaching reaction, including: S210. Determine the initial stirring rate based on the optimal crushed particle size.

[0040] Calculate the initial stirring rate using the following formula:

[0041] in, The mass ratio of leaching agent to pretreated waste residue; α This is a correction factor for the leaching agent ratio; M The molar mass of the leaching agent; This is the initial sulfur content information; The quality of the waste residue after pretreatment; Where is the molar mass of sulfur; This represents the theoretical utilization rate of the leachate.

[0042] in The value range is 1.05-1.2.

[0043] S220. The pretreated waste residue is added to the reactor in proportion, and then the prepared leaching agent is slowly added. Stirring is started at the initial stirring rate to facilitate the start of the leaching reaction.

[0044] The initial stirring rate is calculated using the following formula:

[0045] in, This is the initial stirring rate; 150 represents the optimal crushing particle size; 150 represents the rate coefficient.

[0046] S300. Acquire real-time potential information of the reaction system during the reaction process, and dynamically adjust the stirring rate and reaction time based on the real-time potential information.

[0047] In one possible implementation, S300. During the reaction process, real-time potential information of the reaction system is acquired, and the stirring rate and reaction time are dynamically adjusted based on the real-time potential information, including: S310. Obtain real-time potential information of the reaction system during the reaction process.

[0048] By using a potential monitor installed inside the reactor to detect the potential of the reaction system in real time, real-time potential information of the reaction system during the reaction process can be obtained.

[0049] S320. Determine whether the real-time potential information deviates from the preset potential range, and decide whether to adjust the stirring rate based on the determination result.

[0050] In one possible implementation, step S320, which involves determining whether to adjust the stirring rate based on the judgment result, includes: If the real-time potential information deviates from the potential range, the stirring rate is re-determined based on the real-time potential information; if the real-time potential information does not deviate from the potential range, the stirring rate is not adjusted.

[0051] Potential range is .in This is the critical potential for the sulfur dissolution reaction, with a value ranging from 0.3V to 0.5V. This is the initiation potential of the side reaction, with a value ranging from 0.7. -0.9V. If the real-time potential information deviates from the potential range, adjust the stirring rate using the following calculation formula:

[0052] in, for t Stirring rate at all times; This is the initial stirring rate; β This is the rate adjustment coefficient; for t System potential at time; To set the midpoint of the potential range; This is the critical potential for the sulfur dissolution reaction. This is the initiation potential of the side reaction.

[0053] in The value range is 0.3-0.6.

[0054] During the reaction process, when the potential is monitored three times consecutively... When the difference is ≤ ±0.02V, the reaction is considered to have entered the stable phase, and the stirring rate should be maintained. Reaction to set time The reaction is then stopped. The set duration is determined by the following formula:

[0055] in, The reaction time required for the stable phase; This is the initial sulfur content information; The residual sulfur content in the waste residue when the potential is stable; This represents the sulfur dissolution rate during the stable phase.

[0056] S400. Solid-liquid separation is performed on the leaching mixture to obtain sulfur-containing liquid and leaching residue.

[0057] A plate and frame filter press was used to separate the solid and liquid components of the leaching mixture. The filtration pressure was controlled at 0.3-0.5 MPa to obtain sulfur-containing liquid and leaching residue.

[0058] S500. Extracts sulfur from sulfur-containing liquid.

[0059] In one possible implementation, step S500, extracting sulfur from the sulfur-containing liquid, includes: S510. Obtain the initial sulfur concentration information in the sulfur-containing liquid.

[0060] Three sulfur-containing liquid samples were taken, and the sulfur concentration was detected by inductively coupled plasma atomic emission spectrometry. The average value was taken as the initial sulfur concentration information.

[0061] S520. Determine the initial flow rate of the ion exchange column based on the initial sulfur concentration information, and start enriching sulfur in the sulfur-containing solution at the initial flow rate of the ion exchange column to obtain the sulfur-enriched solution and the sulfur-poor solution.

[0062] The initial flow rate of the ion exchange column is calculated using the following formula:

[0063] in, The initial flow rate of the ion exchange column; The velocity coefficient of the exchange column; This provides initial sulfur concentration information. This represents the cross-sectional area of ​​the ion exchange column.

[0064] in The value range is 0.8-1.2.

[0065] In one possible implementation, step S500, extracting sulfur from the sulfur-containing liquid, further includes: S530. Obtain real-time sulfur concentration information in sulfur-containing liquid.

[0066] An online sampling port was installed on the feed channel of the sulfur-containing liquid flowing through the ion exchange column. An automatic sampling device was used to extract the stream sample in real time, with each sample volume being 20 mL. After extraction, the sample was immediately filtered through a filter membrane to remove suspended impurities to avoid interfering with the detection results. Subsequently, the sample was placed in a constant-temperature detection cell and analyzed using an ICP-OES instrument. t The sulfur concentration at any given time is the real-time sulfur concentration information.

[0067] S540. Adjust the flow rate of the ion exchange column based on real-time sulfur concentration information.

[0068] Adjust the ion exchange column flow rate using the following formula:

[0069] in, for Flow rate of ion exchange column at any given time; The velocity coefficient of the exchange column; This provides real-time sulfur concentration information. Let be the cross-sectional area of ​​the ion exchange column; This is the flow rate correction factor.

[0070] in The value range is 0.9-1.1. When When it is greater than 1.1, The value is 0.9; when When less than 0.9, The value is 1.1; in other cases, The value is 1.0.

[0071] In one possible implementation, step S500, extracting sulfur from the sulfur-containing liquid, further includes: S560. Determine the concentration information of the leaching agent in the sulfur-poor solution.

[0072] Take a sample of the sulfur-poor solution and use acid-base titration to determine the concentration of its effective components, and set the target concentration of the leachate after regeneration.

[0073] S570. Calculate the amount of leaching agent to be added based on the leaching agent concentration information and the target leaching agent concentration information.

[0074] The amount of leaching agent to be added is calculated using the following formula:

[0075] in, This refers to the dosage of the regenerant; V is the correction factor for regenerant addition; V is the volume of lean sulfur liquid (m³). The target concentration for regeneration; This refers to the concentration of the effective components in the lean sulfur solution. This refers to the molar mass of the regenerant.

[0076] in The value ranges from 1.05 to 1.1.

[0077] S580. Add leaching agent to the sulfur-poor solution according to the amount of leaching agent added, so as to prepare a regenerated leaching agent.

[0078] Take a sample of the regenerated leachate and test its performance indicators such as the concentration of effective components and pH value. If the performance meets the standards, it is sent to the leaching process for reuse; if it does not meet the standards, add more regenerated agent and retest until it meets the standards.

[0079] S600. Modify the leaching residue.

[0080] In one possible implementation, step S600, modifying the leaching residue, includes: S610. Determine the silica content and residual sulfur content in the leaching residue.

[0081] The leaching residue was sampled, and the contents of major components such as SiO2, Al2O3, and CaO in the residue were detected by X-ray fluorescence spectrometry. The residual sulfur content ω was detected by ICP-OES. To determine the composition and characteristics of the residue.

[0082] S620. Determine the mineral powder ratio and cementitious material ratio based on the silica content and the residual sulfur content.

[0083] The mineral powder blending ratio is determined by the following formula:

[0084] The cementitious material ratio is determined by the following formula:

[0085] in, For the mineral powder blending ratio, The proportion of cementitious materials; In the residue content; This refers to the residual sulfur content in the residue.

[0086] S630. Prepare a slurry by mixing leaching residue, mineral powder and cementing material in a certain proportion.

[0087] The mineral powder used is blast furnace slag powder, and the cementing material is PO 42.5 cement. The residue, mineral powder, and cementing material are mixed evenly in proportion, and an appropriate amount of water is added to stir into a slurry.

[0088] S640. Pour the slurry into a mold and place it in an aging chamber for aging.

[0089] In one possible implementation, S640. pouring the slurry into a mold and placing it in an aging tank for aging includes: S641. Determine the aging temperature based on the remaining sulfur content.

[0090] The aging temperature is determined using the following formula:

[0091] in, T 20 represents the optimal aging temperature; 20 represents the baseline aging temperature; 2 represents the temperature adjustment coefficient. This refers to the residual sulfur content in the residue.

[0092] S642. Pour the slurry into a mold and place it in an aging chamber, and age it for 28 days at the aging temperature.

[0093] During the aging process, the humidity should be maintained at no less than 90%. After aging, the compressive strength of the modified residue is tested using a pressure testing machine, and the leaching amount of harmful substances is tested using a leaching toxicity detector.

[0094] The beneficial effects of the waste residue sulfur extraction method provided by this invention are as follows: Compared with the prior art, this invention first obtains the characteristic particle size information and initial sulfur content information of the waste residue and pre-treats the waste residue. Then, based on this information, it determines the leaching agent ratio and prepares the leaching agent. This allows the entire sulfur extraction process to conform to the actual characteristics of the waste residue from the source, avoiding the problem of deviating from the actual situation of the waste residue caused by relying solely on experience to set parameters. This lays the foundation for the efficient operation of subsequent stages. The pre-treated waste residue and the prepared leaching agent are then added to the reactor for leaching reaction, providing a suitable initial environment for the separation of sulfur from the waste residue. This ensures the smooth start of the leaching reaction and reduces reaction delays or low efficiency caused by unsuitable initial conditions.

[0095] By acquiring real-time potential information of the reaction system during the reaction process and dynamically adjusting the stirring rate and reaction time based on this information, the system can respond to changes in the reaction process in real time, ensuring that the reaction is always in the optimal state for sulfur leaching. This avoids incomplete leaching caused by fixed reaction conditions and prevents excessive energy consumption, thus improving the accuracy and efficiency of the leaching reaction. Solid-liquid separation is then performed on the leached mixture to obtain sulfur-containing liquid and leaching residue, achieving effective separation of sulfur from the solid waste. This creates conditions for subsequent separate treatment of the sulfur-containing liquid and leaching residue, allowing the subsequent stages of the entire process to proceed in an orderly manner.

[0096] Extracting sulfur from sulfur-containing solutions effectively separates and recovers sulfur resources from the liquid, improving the utilization rate of sulfur resources, reducing waste, and transforming sulfur elements that might otherwise be lost with the waste liquid into reusable resources. Modifying the leaching residue alters its properties, making it suitable for secondary use and avoiding the environmental burden caused by direct disposal. This achieves a closed-loop resource utilization system for waste residue treatment, meeting the requirements of green environmental protection and resource recycling.

[0097] The optimal crushing particle size is determined based on characteristic particle size information and initial sulfur content information. The waste residue is then crushed according to this optimal particle size, ensuring that the crushed residue particle size better meets the requirements of the subsequent leaching reaction. This avoids insufficient contact between the leaching agent and sulfur due to excessively large particle size, while also preventing increased stirring energy consumption and difficulties in subsequent solid-liquid separation due to excessively small particle size, further optimizing the pretreatment effect. The initial stirring rate is determined based on the optimal crushing particle size. Then, the waste residue and leaching agent are added proportionally, and the leaching reaction is initiated with the initial stirring rate. This ensures that the initial stirring conditions of the leaching reaction are compatible with the waste residue particle size, guaranteeing sufficient mixing of the waste residue and leaching agent in the initial stage of the reaction, providing a good start for the efficient leaching reaction.

[0098] The system determines whether real-time potential information deviates from the preset potential range and accordingly decides whether to adjust the stirring rate. It also re-determines the stirring rate when deviations occur and does not adjust it when it does not, making stirring rate adjustment more targeted and scientific. This avoids reaction instability caused by blind adjustment and further improves the controllability of the reaction process. The system obtains the initial sulfur concentration information of the sulfur-containing solution and determines the initial flow rate of the ion exchange column accordingly. Using this flow rate to enrich sulfur and obtain sulfur-enriched and sulfur-depleted solutions allows the operating parameters of the ion exchange column to match the initial state of the sulfur-containing solution, improving the efficiency and effectiveness of sulfur enrichment and reducing resource waste during the enrichment process.

[0099] By acquiring real-time sulfur concentration information of the sulfur-containing solution and adjusting the ion exchange column flow rate accordingly, the system can adapt to changes in sulfur concentration in the solution in real time, ensuring high enrichment efficiency throughout the enrichment process and avoiding a decrease in enrichment effect due to changes in sulfur concentration. The concentration of the leaching agent in the sulfur-poor solution is measured, and the dosage is calculated based on this information and the target concentration of the leaching agent. This allows for the preparation of regenerated leaching agent, achieving recycling of the leaching agent, reducing the total consumption of leaching agent, lowering treatment costs, and also reducing environmental pollution caused by waste leaching agent.

[0100] The silica and residual sulfur content in the leaching residue were measured to determine the proportions of mineral powder and cementitious materials. These three components were then mixed in a specific ratio to form a slurry, which was then aged in an aging chamber. This process ensured that the modification parameters were precisely matched to the compositional characteristics of the residue, guaranteeing good secondary utilization performance. The aging temperature was determined based on the residual sulfur content, and the residue was aged at this temperature for 28 days. This further optimized the aging process, ensuring the final performance stability of the modified residue and maintaining good performance in subsequent applications.

[0101] The entire process, through close coordination and collaboration among its various stages, forms a complete system from waste residue pretreatment to sulfur extraction, residue modification, and leaching agent regeneration. This effectively solves the problems of previous processes that focused only on single-stage parameter control and had broken process logic. It significantly improves the stability of sulfur extraction efficiency, enhances residue modification effects, and greatly reduces leaching agent consumption, making the entire sulfur extraction process more coherent and efficient. It fully meets the actual needs of waste residue resource utilization in industrial production, improving economic benefits while minimizing negative environmental impacts.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0103] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0104] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A method for sulfur extraction from waste residue, characterized in that, include: Obtain characteristic particle size information and initial sulfur content information of the waste residue, and pretreat the waste residue; The leaching agent ratio is determined and the leaching agent is prepared based on the characteristic particle size information and the initial sulfur content information; The pretreated waste residue and the prepared leaching agent are put into the reaction vessel to carry out the leaching reaction; During the reaction process, real-time potential information of the reaction system is obtained, and the stirring rate and reaction time are dynamically adjusted based on the real-time potential information. The leaching mixture was subjected to solid-liquid separation to obtain a sulfur-containing solution and leaching residue. Extract sulfur from the sulfur-containing solution; The leaching residue is modified.

2. The method for sulfur extraction from waste residue as described in claim 1, characterized in that, The process of obtaining characteristic particle size information and initial sulfur content information of the waste residue, and pre-treating the waste residue, includes: The optimal crushing particle size is determined based on the characteristic particle size information and the initial sulfur content information; The waste residue is crushed according to the optimal crushing particle size to obtain pretreated waste residue.

3. The method for sulfur extraction from waste residue as described in claim 2, characterized in that, The step of adding the pretreated waste residue and the prepared leaching agent into the reaction vessel for leaching reaction includes: The initial stirring rate is determined based on the optimal crushing particle size. The pretreated waste residue is added to the reactor in proportion, and then the prepared leaching agent is slowly added. Stirring is started at the initial stirring rate to initiate the leaching reaction.

4. The method for sulfur extraction from waste residue as described in claim 1, characterized in that, The step of acquiring real-time potential information of the reaction system during the reaction process, and dynamically adjusting the stirring rate and reaction time based on the real-time potential information, includes: To obtain real-time potential information of the reaction system during the reaction process; Determine whether the real-time potential information deviates from the preset potential range, and decide whether to adjust the stirring rate based on the determination result.

5. The method for sulfur extraction from waste residue as described in claim 4, characterized in that, The step of determining whether to adjust the stirring rate based on the judgment result includes: If the real-time potential information deviates from the potential range, the stirring rate is re-determined based on the real-time potential information; if the real-time potential information does not deviate from the potential range, the stirring rate is not adjusted.

6. The method for sulfur extraction from waste residue as described in claim 1, characterized in that, The extraction of sulfur from the sulfur-containing solution includes: Obtain the initial sulfur concentration information in the sulfur-containing liquid; The initial flow rate of the ion exchange column is determined based on the initial sulfur concentration information, and sulfur in the sulfur-containing solution is enriched starting at the initial flow rate of the ion exchange column, thereby obtaining a sulfur-enriched solution and a sulfur-poor solution.

7. The method for sulfur extraction from waste residue as described in claim 6, characterized in that, The extraction of sulfur from the sulfur-containing solution further includes: Obtain real-time sulfur concentration information in the sulfur-containing liquid; The flow rate of the ion exchange column is adjusted based on the real-time sulfur concentration information.

8. The method for sulfur extraction from waste residue as described in claim 6, characterized in that, The extraction of sulfur from the sulfur-containing solution further includes: The concentration of the leaching agent in the sulfur-poor solution was determined; The amount of leaching agent to be added is calculated based on the leaching agent concentration information and the target leaching agent concentration information; The leaching agent is added to the sulfur-poor solution according to the specified amount of leaching agent to facilitate the preparation of a regenerated leaching agent.

9. The method for sulfur extraction from waste residue as described in claim 1, characterized in that, The modification treatment of the leaching residue includes: The silica content and residual sulfur content in the leaching residue were determined. The mineral powder ratio and the cementitious material ratio are determined based on the silica content and the residual sulfur content. The leaching residue, mineral powder, and cementing materials are mixed in a specific ratio to form a slurry. The slurry is poured into a mold and placed in an aging chamber for aging.

10. The method for sulfur extraction from waste residue as described in claim 9, characterized in that, The step of pouring the slurry into a mold and placing it in an aging tank for aging includes: The aging temperature is determined based on the remaining sulfur content. The slurry is poured into a mold and placed in an aging chamber, and aged for 28 days at the aging temperature.

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