Fly ash slag salt separating, tempering and purifying integrated device

Abstract

The invention discloses a fly ash salt separation, conditioning and purification integrated device. The fly ash slag salt separating, tempering and purifying integrated device comprises a furnace body, a slag salt separating chamber, a tempering homogenizing chamber and an arch hole are formed in the furnace body, a first feeding port, a second feeding port, a salt discharging port and a tempering slag discharging port are formed in the furnace body, and dehydrated powdery fly ash and a first auxiliary material are fed into the slag salt separating chamber through the first feeding port to be melted and separated to obtain molten salt and molten slag; the molten salt is discharged through the salt discharging port, the molten slag flows into the tempering and homogenizing chamber through the arch hole, the second auxiliary material is fed into the tempering and homogenizing chamber through the second feeding port, the materials are tempered, clarified and homogenized in the tempering and homogenizing chamber to obtain target molten slag with a single component, and the target molten slag is discharged through the tempering and slag discharging port. According to the fly ash slag salt separating, tempering and purifying integrated device, in one furnace, slag / salt separation is completed, the functions of slag tempering, clarifying and homogenizing are achieved, complete resource utilization of waste incineration fly ash is achieved, and the zero landfill requirement is met.

Description

Technical Field

[0001] This invention relates to the field of waste incineration fly ash treatment technology, and in particular to an integrated device for fly ash residue salt separation, conditioning and purification. Background Technology

[0002] As a typical hazardous waste, the treatment of waste incineration fly ash requires a balance between chloride control and resource utilization. Currently, most methods employ water washing or promoting fly ash volatilization to capture chloride in flue gas, resulting in complex processes and low resource utilization rates. For example, water washing reduces the soluble salt content in fly ash, followed by high-temperature melting to separate slag and salt. However, this method is only suitable for fly ash with a chloride content ≤2%. Beyond this range, additional washing cycles are required, leading to a surge in energy consumption and costs. Furthermore, the fly ash needs to be dried again after washing, and the slag-salt co-utilization in the melted products is not fully realized, still posing a risk of secondary pollution. While chloride capture can be achieved through flue gas purification systems, this method relies on the volatility of salts in the fly ash, making it unsuitable for fly ash with high chloride content. The flue gas treatment system is also complex and has high operating costs. In addition, multi-unit series melting processes, where multiple units process in stages, with slag-salt separation and conditioning / homogenization completed by two furnaces connected by chutes, are prone to freezing due to sudden temperature drops, affecting continuous operation. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an integrated device for separating, conditioning, and purifying fly ash residue salt, which simplifies the process flow, reduces energy consumption and costs, improves resource utilization efficiency, and achieves the goal of zero landfill.

[0005] The fly ash slag-salt separation, conditioning, and purification integrated device of this invention includes a furnace body. The furnace body is provided with a slag-salt separation chamber, a conditioning and homogenization chamber, and an arched passage connecting the slag-salt separation chamber and the conditioning and homogenization chamber. The furnace body is provided with a first feeding port, a second feeding port, a salt discharge port, and a conditioning and slag discharge port. The first feeding port and the salt discharge port are respectively connected to the slag-salt separation chamber so that dehydrated powdered fly ash and a first auxiliary material are fed into the slag-salt separation chamber through the first feeding port to melt and separate molten salt and molten slag. The molten salt is discharged through the salt discharge port, and the molten slag flows into the conditioning and homogenization chamber through the arched passage. The second feeding port and the conditioning and slag discharge port are respectively connected to the conditioning and homogenization chamber so that a second auxiliary material is fed into the conditioning and homogenization chamber through the second feeding port. After conditioning, clarification, and homogenization in the conditioning and homogenization chamber, the material obtains a target molten slag with a single composition. The target molten slag is discharged through the conditioning and slag discharge port.

[0006] The fly ash slag salt separation, conditioning and purification integrated device of this invention not only completes the separation of slag / salt in one furnace, but also directly adds component regulators to solve the functions of conditioning, clarification and homogenization.

[0007] The slag after conditioning, impurity removal and homogenization meets the basic requirements for the next step of resource utilization, and can realize the complete resource utilization of waste incineration fly ash, achieving the "zero landfill" requirement.

[0008] In some embodiments, the slag-salt separation chamber and the conditioning and homogenization chamber are arranged at intervals in the horizontal direction, the arch is located between the slag-salt separation chamber and the conditioning and homogenization chamber, and the arch is connected to the bottom of the slag-salt separation chamber and the bottom of the conditioning and homogenization chamber, respectively.

[0009] In some embodiments, the salt discharge port is connected to the upper part of the slag-salt separation chamber.

[0010] In some embodiments, the height of the conditioning slag discharge port is lower than the height of the salt discharge port but higher than the height of the arch.

[0011] In some embodiments, the salt discharge port and the arch are located on opposite sides of the slag-salt separation chamber, and the conditioning slag discharge port and the arch are located on opposite sides of the conditioning and homogenization chamber.

[0012] In some embodiments, the first feed port is connected to the top of the slag-salt separation chamber, and the second feed port is connected to the top of the conditioning and homogenization chamber.

[0013] In some embodiments, the furnace body is provided with a first electrode, at least a portion of which is inserted into the slag-salt separation chamber. The first electrode is used to control the temperature in the slag-salt separation chamber to be 800–1350°C.

[0014] In some embodiments, the furnace body is provided with a second electrode, at least a portion of which is inserted into the conditioning and homogenizing chamber. The second electrode is used to control the temperature in the conditioning and homogenizing chamber to be 1400–1600°C.

[0015] In some embodiments, the furnace body is provided with a first flue and a second flue. The first flue is connected to the top of the slag-salt separation chamber, and the second flue is connected to the top of the conditioning and homogenization chamber. The pressure inside the furnace body is -5 to -50 Pa, so that the process flue gas in the slag-salt separation chamber is discharged through the first flue, and the process flue gas in the conditioning and homogenization chamber is discharged through the second flue.

[0016] In some embodiments, the density of the molten slag in the slag-salt separation chamber is 2.6–3.0 t / m³. 3The density of the molten salt in the slag-salt separation chamber is 1.8–2.0 t / m³. 3 .

[0017] In summary, the integrated fly ash slag-salt separation, conditioning, and purification device of this invention integrates the slag-salt separation chamber and the conditioning and homogenization chamber into a single furnace body, eliminating the risk of chute freezing and improving the structural compactness of the device. The slag-salt separation chamber and the conditioning and homogenization chamber are heated in sections, utilizing density differences to achieve stratified discharge of slag and salt, increasing the tolerance for Cl element to >2%. The horizontal height of the conditioning slag discharge port is lower than that of the salt discharge port, ensuring smooth discharge of molten slag and reducing manual intervention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the integrated fly ash slag salt separation, conditioning and purification device according to an embodiment of the present invention.

[0019] Figure label: 1-Furnace body, 101-Slag-salt separation chamber, 102-Tempering and homogenization chamber, 103-Arch, 104-First feed port, 105-Second feed port, 106-Salt discharge port, 107-Tempering and slag discharge port, 108-First electrode, 109-Second electrode, 110-First flue, 111-Second flue. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The integrated fly ash slag salt separation, conditioning and purification device of the present invention is described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the integrated fly ash slag-salt separation, conditioning, and purification device of this invention includes an integral furnace body 1. The interior of the furnace body 1 is divided into two functionally interconnected yet relatively independent process zones through physical structure (partition walls) and temperature field design: a slag-salt separation chamber 101 and a conditioning and homogenization chamber 102. The slag-salt separation chamber 101 and the conditioning and homogenization chamber 102 are connected by an arched opening 103 located at the bottom of the partition wall, allowing the material to flow in a predetermined direction. Feed ports and discharge ports are respectively provided on the upper part of the furnace body 1 corresponding to each chamber: a first feed port 104 and a salt discharge port 106 are connected to the slag-salt separation chamber 101; a second feed port 105 and a conditioning and slag discharge port 107 are connected to the conditioning and homogenization chamber 102.

[0023] This design realizes the process concept of "one furnace, two zones, and tiered processing". Fly ash first undergoes melting and preliminary salt / slag separation in the slag-salt separation chamber. The separated slag then flows into the conditioning and homogenization chamber for composition adjustment and purification, ultimately producing slag with stable composition that meets resource utilization standards. The entire process is carried out continuously within a closed furnace, eliminating the need for intermediate material transfer and fundamentally solving the problems of easy freezing of connecting chutes, large heat loss, and discontinuous operation in traditional dual-furnace series processes.

[0024] The first feeding port 104 and the salt discharge port 106 are respectively connected to the slag-salt separation chamber 101, so that the dehydrated powdered fly ash and the first auxiliary material (quartz sand) are fed into the slag-salt separation chamber 101 through the first feeding port 104 to melt and separate molten salt and molten slag. The molten salt is discharged through the salt discharge port 106, and the molten slag flows into the conditioning and homogenization chamber 102 through the arch 103.

[0025] Dehydrated powdered fly ash (moisture content ≤1%) and first-class auxiliary materials (such as quartz sand, or chlorine-containing fluxes such as NaCl, CaCl2, and waste salt added according to the composition) are added from the top into the slag-salt separation chamber 101 through the first feed port 104. The furnace temperature inside is precisely controlled at 800–1350℃ (preferably 800–1000℃ to suppress the volatilization of harmful substances) by electrode heating. At this temperature, the materials rapidly melt to form a high-temperature melt.

[0026] The melt is mainly composed of silicate slag with a relatively high density (density ρ≈2.6~3.0t / m³) and chloride molten salt with a relatively low density (density ρ≈1.8~2.0t / m³). The density difference between the two is significant (≥0.8t / m³), and they settle naturally in the molten pool under gravity to form a clear interface: the upper layer is molten salt and the lower layer is slag.

[0027] The salt discharge port 106 is located above or at the top of the slag-salt separation chamber 101, adapted to the height of the upper molten salt liquid level. The upper molten salt is discharged continuously or intermittently through this port to obtain a salt product that can be recycled or further processed.

[0028] An archway 103 is located on the bottom side wall of the slag-salt separation chamber 101, with its inlet height within the lower molten slag layer. The denser molten slag flows naturally into the adjacent conditioning and homogenization chamber 102 through this archway under the influence of static pressure difference. The archway design prevents the mixing of molten salt, ensuring separation purity.

[0029] The second feed port 105 and the conditioning and slag discharge port 107 are respectively connected to the conditioning and homogenization chamber 102 so that the second auxiliary material (quartz sand) is fed into the conditioning and homogenization chamber 102 through the second feed port 105. After the material is conditioned, clarified and homogenized in the conditioning and homogenization chamber 102, a target molten slag with a single composition is obtained. The target molten slag is discharged through the conditioning and slag discharge port 107.

[0030] The molten slag flowing from the slag-salt separation chamber enters the conditioning and homogenization chamber 102. A second auxiliary material, mainly silica sand (SiO2) or silicon-containing waste, is added from the top through the second feed port 105 to adjust the chemical composition of the molten slag (such as the critical SiO2 / CaO ratio).

[0031] The indoor environment provides a higher temperature (1400–1600°C) via electrodes. This high-temperature environment serves multiple purposes: Driving reaction: Promotes the full reaction and fusion of the added conditioning agent with the slag.

[0032] Promote homogenization: Improve melt fluidity and make the components evenly distributed at the microscale.

[0033] Deep clarification: Utilizing the characteristic that the viscosity of molten slag decreases at high temperatures, residual microbubbles, unmelted impurities, or trace amounts of metallic phases are further floated and separated, thereby improving the purity and uniformity of the molten slag.

[0034] The slag discharge port 107 is located on the side wall of the conditioned and homogenizing chamber 102, and its height is designed to be lower than the salt discharge port 106 but higher than the inlet of the arch 103. This ingenious elevation design ensures that the molten slag has sufficient residence time in the conditioned and homogenizing chamber 102 to complete the above process; only the target molten slag that has been fully conditioned, clarified and homogenized can be discharged from this port; and untreated molten slag or intermediate materials are prevented from flowing out in a short circuit.

[0035] That is, fly ash is the main material, with a mass fraction of 50-100%. Auxiliary materials include a Class I flux with a mass fraction of 0-50% and a Class II flux with a mass fraction of 0-20%. The Class I flux includes NaCl, CaCl2, NaCl+CaCl2, or solid waste containing chloride salts, such as hazardous waste incineration fly ash and waste salts; the Class II flux includes quartz sand (SiO2) or siliceous solid waste.

[0036] The integrated fly ash slag-salt separation, conditioning, and purification device of this invention not only completes the separation of slag and salt within a single furnace, but also directly adds component regulators, solving the functions of conditioning, clarification, and homogenization. Furthermore, it avoids the problem in related technologies where "the slag-salt separation process and the conditioning and homogenization process consist of two furnaces connected by a chute, which is prone to freezing."

[0037] The slag after conditioning, impurity removal and homogenization meets the basic requirements for the next step of resource utilization, and can realize the complete resource utilization of waste incineration fly ash, achieving the "zero landfill" requirement.

[0038] Optionally, such as Figure 1As shown, the slag-salt separation chamber 101 and the conditioning and homogenization chamber 102 are arranged at intervals in the left and right directions. The arch 103 is located between the slag-salt separation chamber 101 and the conditioning and homogenization chamber 102. The left end of the arch 103 is connected to the bottom of the slag-salt separation chamber 101, and the right end of the arch 103 is connected to the bottom of the conditioning and homogenization chamber 102.

[0039] Understandably, the fly ash melts within the slag-salt separation chamber 101. Utilizing the density difference between the molten slag and molten salt, the two high-temperature melts stratify within the chamber, with the upper layer being the molten salt layer and the lower layer being the molten slag layer. For example, the density of the molten slag within the slag-salt separation chamber 101 is 2.6–3.0 t / m³. 3 The density of molten salt in the slag-salt separation chamber 101 is 1.8–2.0 t / m³. 3 That is, the critical density difference between slag and molten salt is ≥0.8t / m³, achieving a clear stratified interface.

[0040] Optionally, such as Figure 1 As shown, the salt discharge port 106 is connected to the upper part of the slag-salt separation chamber 101, so that the upper layer of molten salt can be discharged through the salt discharge port 106. In addition, the height of the conditioning slag discharge port 107 is lower than the height of the salt discharge port 106 and higher than the height of the arch 103, ensuring that the molten slag after conditioning, clarification and homogenization can be smoothly discharged through the conditioning slag discharge port 107, and avoiding the direct discharge of untreated molten slag.

[0041] Specifically, such as Figure 1 As shown, the salt discharge port 106 and the arched tunnel 103 are located on the left and right sides of the slag-salt separation chamber 101, respectively, and the conditioning slag discharge port 107 and the arched tunnel 103 are located on the left and right sides of the conditioning and homogenization chamber 102, respectively.

[0042] Within the slag-salt separation chamber 101, the molten slag and molten salt form clear stratification due to their density difference, with molten salt on top and molten slag on the bottom. A salt discharge port 106 is located at the top of the slag-salt separation chamber 101, directly capturing the upper layer of molten salt and preventing molten slag from mixing in. An archway 103 is located at the bottom of the slag-salt separation chamber 101, allowing only the lower layer of molten slag to pass through, ensuring the physical separation of molten salt and molten slag. Through this stratified design, molten salt and molten slag flow in different areas, preventing mixing and improving separation efficiency. The archway 103 connects the bottom of the slag-salt separation chamber 101 to the bottom of the conditioning and homogenization chamber 102, allowing the molten slag to flow naturally into the conditioning and homogenization chamber 102, avoiding the problem of sudden temperature drops and freezing caused by chute connections.

[0043] The height of the slag discharge port 107 is lower than that of the salt discharge port 106 but higher than that of the arch 103, ensuring that the molten slag remains in the quenching and homogenization chamber 102 for a sufficient time to complete quenching, clarification, and homogenization. The position of the slag discharge port 107 above the arch 103 prevents insufficiently homogenized slag from being discharged directly from the arch 103, ensuring that only qualified slag is discharged. The quenching and homogenization chamber 102 adjusts the slag composition (e.g., SiO2 / CaO ratio) by adding a second auxiliary material (such as quartz sand) to meet the resource utilization requirements of subsequent building material preparation.

[0044] Optionally, such as Figure 1 As shown, the first feeding port 104 is connected to the top of the slag-salt separation chamber 101. Top feeding ensures a clear interface between molten salt and slag through gravity stratification. The second feeding port 105 is connected to the top of the conditioning and homogenization chamber 102. Top feeding can evenly disperse the material, expand the contact area with the high-temperature molten slag, and improve the homogenization effect.

[0045] Optionally, such as Figure 1 As shown, a first electrode 108 is provided on the furnace body 1. At least a portion of the first electrode 108 is inserted into the slag-salt separation chamber 101. The first electrode 108 is used to control the temperature in the slag-salt separation chamber 101 to be 800-1350°C. The temperature of the slag-salt separation chamber 101 ensures density difference and settling speed, preferably 800-1000°C (minimum volatilization rate).

[0046] like Figure 1 As shown, a second electrode 109 is provided on the furnace body 1. At least a portion of the second electrode 109 is inserted into the conditioning and homogenization chamber 102. The second electrode 109 is used to control the temperature in the conditioning and homogenization chamber 102 to be 1400-1600℃. The temperature of the conditioning and homogenization chamber 102 drives mineral phase transformation and impurity separation.

[0047] Optionally, such as Figure 1 As shown, the furnace body 1 is provided with a first flue 110 and a second flue 111. The first flue 110 is connected to the top of the slag-salt separation chamber 101, and the second flue 111 is connected to the top of the conditioning and homogenization chamber 102.

[0048] The furnace operates under negative pressure, with the pressure inside the furnace chamber 1 ranging from -5 to -50 Pa. This allows the process flue gas in the slag-salt separation chamber 101 to be discharged through the first flue 110, and the process flue gas in the conditioning and homogenization chamber 102 to be discharged through the second flue 111. The process flue gas can be centrally treated and ultimately discharged in compliance with emission standards.

[0049] In other words, the entire furnace operates under a slight negative pressure (-5 to -50 Pa). This negative pressure environment effectively prevents harmful gases from escaping, ensuring that all flue gas is drawn into subsequent purification systems (such as quenching, acid removal, and dust removal), ultimately achieving emissions compliance. Simultaneously, the slight negative pressure also helps maintain a stable atmosphere inside the furnace, controlling the reaction process.

[0050] The process principle of the integrated fly ash slag salt separation, conditioning and purification device according to an embodiment of the present invention is described below.

[0051] Slag-salt separation stage: Physical separation is achieved at a relatively low temperature (800–1350℃) by utilizing the density difference between molten slag and molten salt. This temperature ensures complete melting of fly ash while also minimizing energy consumption and inhibiting volatile pollutants (such as heavy metals and dioxins). The added first auxiliary material (such as silica sand) can adjust the initial basicity of the molten slag, improve fluidity, and promote separation.

[0052] Conditioning and purification stage: The separated slag is refined at a higher temperature (1400-1600℃). The high temperature not only causes the added conditioning agents (such as quartz sand) to melt rapidly and adjust the slag to the target composition (such as adjusting SiO2 / CaO from 1.0 to 1.8 to meet the requirements for preparing mineral wool, microcrystalline glass or cement admixtures), but also significantly reduces the impurity content and chemical inhomogeneity in the slag through high-temperature homogenization and clarification, producing a high-quality slag product with a single composition and stable performance.

[0053] Example 1: Waste incineration fly ash is dehydrated using steam, reducing its moisture content to ≤1%. If the fly ash moisture content is too high, the water will vaporize instantly in the slag-salt separation furnace, causing violent splashing of the molten material, leading to a chaotic interface between the molten slag and molten salt, and disrupting density stratification. Therefore, controlling the moisture content of the fly ash entering the furnace to ≤1% ensures the safe operation of the fly ash melting process and improves the effectiveness of slag-salt separation. For example, the moisture content can be reduced to 0.5%.

[0054] Dehydrated powdered fly ash is directly fed into the slag-salt separation chamber 101 through the first feed port 104. Quartz sand is fed into the slag-salt separation chamber 101 in a certain proportion through a screw conveyor. The SiO2 / CaO ratio in the molten pool is 1.0.

[0055] The slag-salt separation chamber 101 is heated by electrodes, and the average temperature of the molten pool is 1250℃. This is achieved by utilizing the density difference between the molten slag and molten salt (molten slag ρ≈2.8t / m³). 3 ) and molten salt (ρ≈1.9t / m 3 The two high-temperature melts in the furnace are separated into layers. The upper layer is the molten salt layer, which is discharged through the salt outlet 106. The lower layer is the molten slag layer, which flows from the arch 103 to the conditioning and homogenization chamber 102 to obtain molten slag, thus realizing the primary slag-salt separation.

[0056] Quartz sand is fed into the conditioning and homogenization chamber 102 through the second feed port 105. The material is heated by electrodes and the average temperature of the molten pool is 1500℃. After the material is conditioned, clarified and homogenized in the conditioning and homogenization chamber 102, a new slag with a single composition is obtained and discharged through the conditioning and slag discharge port 107. Its SiO2 / CaO=1.8.

[0057] The slag-salt separation chamber 101 and the conditioning and homogenization chamber 102 are respectively equipped with a first flue 110 and a second flue 111 to ensure the absorption of flue gas emissions. The furnace operates under negative pressure, with the negative pressure at -10Pa. The process flue gas can be centrally treated and ultimately discharged in compliance with standards.

[0058] Example 2: Waste incineration fly ash is dehydrated using steam, reducing the moisture content to 0.7%. The dehydrated powdered fly ash is directly sent to the slag-salt separation chamber 101. Glyphosate waste salt (NaCl content of 93.4%) is conveyed by a screw conveyor, and quartz sand is conveyed by a screw conveyor. The three materials are sent to the slag-salt separation chamber 101 in a mass fraction of 50:30:20. The SiO2 / CaO ratio in the molten pool is 1.0.

[0059] The slag-salt separation chamber 101 is heated by electrodes, and the average temperature of the molten pool is 850℃. This is achieved by utilizing the density difference between the molten slag and molten salt (molten slag ρ≈2.8t / m³). 3 ) and molten salt (ρ≈1.9t / m 3 The two high-temperature melts in the furnace are separated into layers. The upper layer is the molten salt layer, which is discharged through the salt outlet 106. The lower layer is the molten slag layer, which flows from the arch 103 to the conditioning and homogenization chamber 102 to obtain molten slag, thus realizing the primary slag-salt separation.

[0060] The molten slag enters the conditioning and homogenization chamber 102 through the arch 103. Quartz sand and bauxite are fed into the conditioning and homogenization chamber 102 through the second feed port 105. The materials are heated by electrodes, and the average temperature of the molten pool is 1500℃. After the materials are conditioned, clarified and homogenized in the conditioning and homogenization chamber 102, a new molten slag with a single composition is obtained. It is discharged through the conditioning and slag discharge port 107 to obtain the target molten slag with SiO2 / CaO=1.8.

[0061] In summary, the fly ash slag-salt separation, conditioning, and purification integrated device of this invention integrates the slag-salt separation chamber 101 and the conditioning and homogenization chamber 102 into a single furnace body 1, eliminating the risk of chute freezing and improving the structural compactness of the device. The slag-salt separation chamber 101 and the conditioning and homogenization chamber 102 are heated in sections, utilizing density differences to achieve stratified discharge of slag and salt, increasing the tolerance for Cl element to >2%. The horizontal height of the conditioning slag discharge port 107 is lower than that of the salt discharge port 106, ensuring smooth discharge of molten slag and reducing manual intervention.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 this invention.

[0063] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An integrated device for separating, conditioning, and purifying fly ash, slag, and salt, characterized in that, The furnace includes a furnace body, which contains a slag-salt separation chamber, a conditioning and homogenization chamber, and an arched passage connecting the slag-salt separation chamber and the conditioning and homogenization chamber. The furnace body has a first feeding port, a second feeding port, a salt discharge port, and a conditioning and slag discharge port. The first feeding port and the salt discharge port are respectively connected to the slag-salt separation chamber, so that dehydrated powdered fly ash and a first auxiliary material are fed into the slag-salt separation chamber through the first feeding port to melt and separate molten salt and molten slag. The molten salt is discharged through the salt discharge port, and the molten slag flows into the conditioning and homogenization chamber through the arched passage. The second feeding port and the conditioning and slag discharge port are respectively connected to the conditioning and homogenization chamber, so that a second auxiliary material is fed into the conditioning and homogenization chamber through the second feeding port. After conditioning, clarification, and homogenization in the conditioning and homogenization chamber, the material obtains a target molten slag with a single composition, which is discharged through the conditioning and slag discharge port.

2. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 1, characterized in that, The slag-salt separation chamber and the conditioning and homogenization chamber are arranged at intervals along the horizontal direction. The arch is located between the slag-salt separation chamber and the conditioning and homogenization chamber, and the arch is connected to the bottom of the slag-salt separation chamber and the bottom of the conditioning and homogenization chamber, respectively.

3. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 2, characterized in that, The salt discharge port is connected to the upper part of the slag-salt separation chamber.

4. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 3, characterized in that, The height of the conditioning slag discharge port is lower than the height of the salt discharge port but higher than the height of the arch.

5. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 4, characterized in that, The salt discharge port and the arch are located on opposite sides of the slag-salt separation chamber, and the conditioning slag discharge port and the arch are located on opposite sides of the conditioning and homogenization chamber.

6. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 2, characterized in that, The first feed port is connected to the top of the slag-salt separation chamber, and the second feed port is connected to the top of the conditioning and homogenization chamber.

7. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 1, characterized in that, The furnace body is provided with a first electrode, at least a portion of which is inserted into the slag-salt separation chamber. The first electrode is used to control the temperature in the slag-salt separation chamber to be 800-1350°C.

8. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 1, characterized in that, The furnace body is provided with a second electrode, at least a portion of which is inserted into the conditioning and homogenizing chamber. The second electrode is used to control the temperature in the conditioning and homogenizing chamber to be 1400-1600°C.

9. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 1, characterized in that, The furnace body is provided with a first flue and a second flue. The first flue is connected to the top of the slag-salt separation chamber, and the second flue is connected to the top of the conditioning and homogenization chamber. The pressure inside the furnace body is -5 to -50 Pa, so that the process flue gas in the slag-salt separation chamber is discharged through the first flue, and the process flue gas in the conditioning and homogenization chamber is discharged through the second flue.

10. The integrated fly ash slag salt separation, conditioning, and purification device according to claim 1, characterized in that, The density of the molten slag in the slag-salt separation chamber is 2.6–3.0 t / m³. 3 The density of the molten salt in the slag-salt separation chamber is 1.8–2.0 t / m³. 3 .

Images