Continuous separation device for ecological treatment of alkali residue

Abstract

This application relates to the technical field of alkali slag treatment equipment and discloses a continuous separation device for ecological treatment of alkali slag. It includes a crystal-inducing cloth sleeve installed at one end of a horizontal reaction tank. A disturbance mixing structure is movably installed at the end of the horizontal reaction tank near the crystal-inducing cloth sleeve. A slurry conveying structure is connected to one side of the crystal-inducing cloth sleeve. A supernatant discharge structure is fixedly installed at the end of the horizontal reaction tank away from the crystal-inducing cloth sleeve. A slag discharge structure is fixedly installed at the bottom of the horizontal reaction tank. In this application, lime slurry and coarse-particle calcium carbonate slurry are dispersed and flow together into the liquid to be treated at the crystal-inducing cloth sleeve and undergo a causticization reaction. After the reaction, the slurry enters the area where the slurry conveying structure is located after being subjected to the disturbance mixing structure. Subsequently, the supernatant is discharged, the coarse-particle calcium carbonate slurry is returned, and the bottom sludge is discharged. This effectively improves the stability of continuous stratified treatment of the reaction slurry and improves the continuous operation effect of liquid phase output, slurry return, and sludge discharge.

Description

Technical Field

[0001] This application relates to the technical field of alkali slag treatment equipment, specifically to a continuous separation device for ecological treatment of alkali slag. Background Technology

[0002] In the ecological treatment of alkali slag, after the pretreatment, a slurry containing liquid and solid particles is usually formed to be separated. Especially in the causticization and recovery stage, after the liquid to be treated reacts with lime milk, calcium carbonate particles will continue to be generated, so that the system gradually forms a multiphase mixed state containing an upper liquid phase, a middle suspended slurry and a lower sediment. In order to ensure that the entire ecological treatment process of alkali slag can be carried out continuously and stably, it is usually necessary to continuously stratify the slurry and complete the liquid phase export, slurry return and sediment discharge separately.

[0003] However, in the existing technology, on the one hand, the lime slurry is often added in a concentrated manner at the front end of the reaction, which can easily lead to an overly concentrated reaction in local areas. This results in uneven distribution of calcium carbonate particles in the early stage of formation, affecting the stability of the overall state of the slurry and hindering the smooth progress of the subsequent continuous separation process.

[0004] On the other hand, existing equipment often lacks a continuous stratified treatment structure for the upper liquid phase, the middle usable slurry, and the lower sludge when processing the above-mentioned reaction slurry. This leads to easy interference between the liquid phase extraction, slurry extraction, and sludge discharge in the later section, resulting in unclear liquid-solid interfaces, particles entrained in the upper liquid phase, unstable slurry extraction in the middle section, and unsmooth sludge discharge in the lower section. This affects the continuous operation of the alkali slag ecological treatment process.

[0005] Therefore, there is an urgent need for a continuous separation device that can achieve continuous stratified treatment of slurry in the ecological treatment of alkali residue, and take into account the upper liquid phase export, the middle slurry transport and the lower sediment discharge, so as to systematically solve the problems of insufficient continuous separation stability, mutual influence between slurry extraction and slag discharge and unsatisfactory overall operation effect in the existing technology. Summary of the Invention

[0006] To address the aforementioned technical issues, this application provides a continuous separation device for the ecological treatment of alkali slag, which enables continuous stratified treatment of the reaction slurry formed during the ecological treatment of alkali slag, while also taking into account the extraction of the upper liquid phase, the delivery of the middle slurry, and the discharge of the lower sediment, thereby improving the continuous stability of the overall treatment process.

[0007] To achieve the above objectives, this application provides the following technical solution: This application provides a continuous separation device for the ecological treatment of alkali residue, including a horizontal reaction tank. The horizontal reaction tank is fixedly equipped with an inlet for the liquid to be treated and a lime slurry input structure. The device is characterized in that: a crystal-inducing cloth sleeve is fixedly installed inside the front end of the horizontal reaction tank; a disturbance mixing structure for agitating and mixing the reaction slurry is movably installed at one end of the horizontal reaction tank near the crystal-inducing cloth sleeve, the disturbance mixing structure being located below the crystal-inducing cloth sleeve; a slurry conveying structure for extracting coarse-particle calcium carbonate slurry and conveying it to the crystal-inducing cloth sleeve is connected to one side of the crystal-inducing cloth sleeve; and a [missing information - likely a specific device or structure] is fixedly installed at the end of the horizontal reaction tank away from the crystal-inducing cloth sleeve. The horizontal reactor is equipped with a supernatant discharge structure for discharging the liquid phase, and a slag discharge structure for discharging sludge is fixedly installed at the bottom. Lime slurry and coarse-particle calcium carbonate slurry are dispersed and flow together into the liquid to be treated at the crystallizer sleeve and undergo a causticization reaction. After the reaction, the slurry enters the area where the slurry pick-and-place structure is located after being subjected to the disturbance mixing structure. Subsequently, the supernatant is discharged, the coarse-particle calcium carbonate slurry is returned, and the bottom sludge is discharged. Through the above settings, the causticization reaction, particle control, slurry return, liquid phase discharge, and sludge discharge processes can be integrated into the same horizontal reactor, which is beneficial to improving the continuity and processing stability of the entire causticization recovery process.

[0008] Furthermore, the crystallizer sleeve includes a material guiding structure for inputting lime slurry, and an annular sleeve for inputting coarse-particle calcium carbonate slurry is sleeved on the outside of the material guiding structure. A dispersion material distribution structure for dispersing lime slurry and coarse-particle calcium carbonate slurry into the liquid to be treated is fixedly connected to the discharge side of the material guiding structure and the annular sleeve. Through the above arrangement, the lime slurry and coarse-particle calcium carbonate slurry can form a co-flow relationship before entering the liquid to be treated, thereby improving the introduction state of lime slurry at the front end of the reaction.

[0009] Furthermore, the dispersing structure includes a conical diverter head fixedly connected to the discharge end of the material guiding structure. Multiple dispersing holes are opened on the outer periphery of the conical diverter head. An annular flow slit is formed between the discharge end of the annular sleeve and the conical diverter head. Through the above arrangement, lime slurry can be dispersed and discharged through multiple dispersing holes, and coarse-particle calcium carbonate slurry can be discharged synchronously along the outer periphery of the conical diverter head, thereby improving the dispersibility of the front-end dispersing area.

[0010] Furthermore, multiple dispersion holes are spaced apart circumferentially along the conical diverter head, and an annular flow guide slit is set around the area where the multiple dispersion holes are located. This allows the coarse-particle calcium carbonate slurry to be simultaneously discharged along the outside of the multiple dispersion holes when the lime slurry is dispersed and discharged through the multiple dispersion holes. Through the above arrangement, the lime slurry and the coarse-particle calcium carbonate slurry can form a more stable flow guide discharge state in terms of spatial distribution, thereby reducing the impact caused by the local concentrated introduction of lime slurry.

[0011] Furthermore, the material guiding structure is fixedly installed along the length of the horizontal reaction tank, and the annular sleeve is coaxially sleeved on the outside of the material guiding structure. The dispersing and distributing structure is fixedly connected to the front end of the material guiding structure and the annular sleeve, so that lime slurry is introduced into the dispersing and distributing structure from the material guiding structure, and coarse-particle calcium carbonate slurry is introduced into the dispersing and distributing structure from the annular sleeve. Through the above arrangement, lime slurry and coarse-particle calcium carbonate slurry can be introduced into the dispersing and distributing structure along a relatively concentrated forward path, which is beneficial to maintaining the consistency of the front-end distributing state.

[0012] Furthermore, the disturbance mixing structure includes a rotating support structure that is rotatably arranged along the length of the horizontal reaction tank. One side of the rotating support structure is connected to a drive structure for driving the rotating support structure to rotate. A disturbance structure for agitating the reaction slurry is fixedly arranged on the outside of the rotating support structure. Through the above arrangement, a disturbance effect can be continuously applied to the reaction slurry behind the crystallizing cloth sleeve, thereby providing conditions for subsequent contact and state adjustment of calcium carbonate particles.

[0013] Furthermore, the rotating support structure is installed through the middle section of the horizontal reaction tank, and the disturbance structure includes multiple disturbance blades fixedly arranged at intervals along the length of the rotating support structure. When the rotating support structure rotates, the multiple disturbance blades agitate the reaction slurry, keeping the calcium carbonate particles in the reaction slurry in a dispersed contact state. Through the above arrangement, the effective disturbance range of the reaction slurry in the middle section can be extended, which is beneficial to improving the particle state of calcium carbonate particles before they enter the separation zone.

[0014] Furthermore, the slurry conveying structure includes a slurry extraction pipe for extracting coarse-particle calcium carbonate slurry. One side of the slurry extraction pipe is connected to a conveying pipe for transporting coarse-particle calcium carbonate slurry. The end of the conveying pipe away from the slurry extraction pipe is connected to an annular sleeve. The slurry extraction pipe is fixedly installed between the supernatant discharge structure and the slag discharge structure. Through the above arrangement, the coarse-particle calcium carbonate slurry in the downstream area can be re-transported to the front crystallizer cloth sleeve, thereby forming a slurry circulation conveying path.

[0015] Furthermore, the supernatant discharge structure includes an overflow weir fixedly installed at the upper part of the rear section of the horizontal reaction tank. An outlet for discharging the upper liquid phase is opened on one side of the overflow weir. The outlet is connected to a discharge pipe for transporting the liquid phase. Through the above arrangement, the upper liquid phase in the rear section can be discharged first, which helps to reduce the residence time of the upper liquid phase in the subsequent area.

[0016] Furthermore, the slag discharge structure includes a slag collection trough fixedly installed at the lower rear section of the horizontal reactor for collecting slag. A slag discharge pipe for discharging slag is connected to one side of the slag collection trough. An opening and closing structure for controlling the discharge of slag is fixedly installed on the slag discharge pipe. Through the above configuration, the settled calcium carbonate slag can be collected and discharged in a controlled manner, thereby improving the stability of the slag discharge process.

[0017] Furthermore, the slurry intake end of the slurry intake pipe is fixedly located below the overflow weir, and the slurry intake end of the slurry intake pipe is set higher than the slag collection tank, so that after the upper liquid phase is discharged through the supernatant discharge structure, the coarse-particle calcium carbonate slurry in the middle area is extracted through the slurry intake pipe and transported to the crystallizer cloth sleeve, and the lower sludge is discharged through the slag discharge structure. Through the above settings, a stratified treatment state of upper liquid phase discharge, middle slurry intake and delivery, and lower sludge discharge can be formed in the rear section of the horizontal reactor, which is conducive to improving the liquid-solid separation and continuous operation effect in the rear section.

[0018] The technical solution provided in this application has the following advantages compared with the prior art: 1. This application improves the addition state of lime slurry in the initial region of the causticization reaction by setting a crystal-inducing cloth sleeve at the front end of the horizontal reaction tank and allowing lime slurry and coarse-particle calcium carbonate slurry to flow together and disperse into the liquid to be treated at the crystal-inducing cloth sleeve. This reduces the local reaction caused by the local concentrated introduction of lime slurry, thereby reducing the possibility of local scaling, local encapsulation and uneven reaction in the front end region, which is beneficial to improving the uniformity and stability of the causticization reaction.

[0019] 2. This application, by setting up a disturbance mixing structure, a slurry conveying structure, a supernatant discharge structure, and a slag discharge structure, enables the slurry after reaction to form a relatively clear liquid phase discharge area, slurry conveying area, and slag discharge area in the subsequent processing. This helps to reduce the impact of disordered dispersion of fine particles in the slurry in the later stage, improve the liquid-solid separation state, enhance the stability of coarse calcium carbonate slurry return and bottom slag discharge, and thus improve the continuous operation effect of the entire causticization recovery process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 this application. 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 structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the horizontal reaction vessel in an embodiment of this application; Figure 3 This is a schematic diagram showing the connection between the crystal-inducing fabric sleeve and the delivery pipe in an embodiment of this application; Figure 4 This is a cross-sectional view of the horizontal reaction vessel in an embodiment of this application; Figure 5This is a cross-sectional view of the crystal-inducing fabric sleeve in an embodiment of this application; Figure 6 for Figure 5 Enlarged view of the structure of section A; Figure 7 This is a schematic diagram of the structure of the annular sleeve in the embodiments of this application; Figure 8 This is a schematic diagram of the rotating support structure in an embodiment of this application.

[0022] Explanation of icon numbers: 1. Horizontal reaction vessel; 11. Inlet of liquid to be treated; 12. Lime slurry input structure; 13. Crystallizer cloth sleeve; 14. Disturbance mixing structure; 15. Slurry conveying structure; 16. Supernatant discharge structure; 17. Slag discharge structure; 2. Material guiding structure; 21. Annular sleeve; 22. Dispersing and distributing structure; 23. Conical diverter head; 24. Dispersing hole; 25. Annular tracing slot; 3. Rotational support structure; 31. Drive structure; 32. Disturbance structure; 33. Disturbance blade; 4. Slurry sampling pipe; 41. Conveying pipe; 5. Overflow weir; 51. Liquid outlet; 52. Drain pipe; 6. Slag collection trough; 61. Slag discharge pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] The present application will be further described below with reference to embodiments. Example 1

[0025] Reference Figure 1 - Figure 8 This embodiment provides a continuous separation device for the ecological treatment of alkali residue, which is mainly used to solve the problem that lime slurry is prone to forming a local concentrated reaction zone when added at the front end of the causticization reaction in the prior art, which leads to local scaling, local encapsulation and uneven reaction.

[0026] It should be noted that the alkaline slag resource utilization process corresponding to this application includes a desulfurization unit, a carbonization unit, an oxidation unit, a causticization recovery unit, and a tail gas treatment unit. The desulfurization unit is used to remove sulfides from the alkaline slag, the carbonization unit is used to convert the relevant components in the system and form the liquid to be treated for subsequent treatment, the oxidation unit is used to further reduce the content of organic matter and residual impurities in the system, the causticization recovery unit is used to complete the conversion of sodium carbonate to sodium hydroxide and generate calcium carbonate precipitate, and the tail gas treatment unit is used to absorb and treat the tail gas generated by each unit.

[0027] This embodiment mainly describes in detail the continuous separation device for ecological treatment of alkali residue used in the causticization recovery unit. The conventional reaction equipment, conventional separation equipment, conveying pipelines, valve assemblies, support assemblies, drive assemblies and control assemblies involved in other units are all conventional settings in the field and will not be described in detail here.

[0028] The continuous separation device for ecological treatment of alkali residue includes a horizontal reaction tank 1. The horizontal reaction tank 1 is preferably a horizontal cylindrical tank arranged along the length direction. The front end of the horizontal reaction tank 1 is provided with a liquid to be treated inlet 11 and a lime milk input structure 12. The front end of the horizontal reaction tank 1 is provided with a crystal-inducing cloth sleeve 13. The horizontal reaction tank 1 can be made of 304 stainless steel, 316L stainless steel or other alkali-resistant metal materials. Its inner wall is provided with an anti-corrosion lining to improve the durability of the equipment under high alkaline conditions.

[0029] Specifically, the front wall of the horizontal reactor 1 is provided with connection ports for installing the inlet 11 of the liquid to be treated, the lime slurry input structure 12, and the crystallizer cloth sleeve 13. The inlet 11 of the liquid to be treated is fixedly connected to the front wall of the horizontal reactor 1 and communicates with the interior of the horizontal reactor 1. The lime slurry input structure 12 is connected to the material guiding structure 2 through a flange, threaded joint, or welded joint. The crystallizer cloth sleeve 13 passes through the front wall of the horizontal reactor 1 and is fixedly connected to the horizontal reactor 1. A sealing connection structure is provided between the crystallizer cloth sleeve 13 and the front wall of the horizontal reactor 1 to prevent leakage of highly alkaline slurry from the penetration point.

[0030] The crystal-inducing material sleeve 13 includes a material guiding structure 2, an annular sleeve 21, and a dispersing material distribution structure 22. The material guiding structure 2 is used to input lime slurry and is preferably a hollow straight pipe arranged along the length of the horizontal reaction tank 1. One end of the material guiding structure 2 passes through the front wall of the horizontal reaction tank 1 and is connected to the lime slurry input structure 12. The other end of the material guiding structure 2 extends into the interior of the horizontal reaction tank 1 and is fixedly connected to the dispersing material distribution structure 22.

[0031] An annular sleeve 21 is fitted onto the outside of the material guiding structure 2. An annular flow channel is formed between the inner wall of the annular sleeve 21 and the outer wall of the material guiding structure 2. One end of the annular sleeve 21 is connected to the slurry delivery structure 15, and the other end extends to the location of the dispersing and distributing structure 22. The annular sleeve 21 can be fixedly connected to the material guiding structure 2 via a support ring, connecting rib, or positioning sleeve to ensure that the annular sleeve 21 and the material guiding structure 2 are arranged coaxially or approximately coaxially. The dispersing and distributing structure 22 is fixedly installed on the discharge side of the material guiding structure 2 and the annular sleeve 21, and is used to disperse lime slurry and coarse-grained calcium carbonate slurry into the liquid to be treated.

[0032] Specifically, the dispersing structure 22 includes a conical diverter head 23 fixedly connected to the discharge end of the material guiding structure 2. The interior of the conical diverter head 23 is connected to the interior of the material guiding structure 2. Multiple dispersing holes 24 are opened on the outer periphery of the conical diverter head 23. The multiple dispersing holes 24 are connected to the interior of the conical diverter head 23 respectively. The discharge end of the annular sleeve 21 extends to the outside of the conical diverter head 23. The discharge end of the annular sleeve 21 and the outer periphery of the conical diverter head 23 are spaced apart, and the gap between the two forms an annular flow-tracing slit 25 around the conical diverter head 23.

[0033] Multiple dispersion holes 24 are arranged at intervals along the circumference of the conical diverter head 23, and an annular flow-accompanying slit 25 is arranged around the area where the multiple dispersion holes 24 are located, so that the coarse-particle calcium carbonate slurry can form an accompanying outflow state along the outside of the dispersion holes 24.

[0034] The conical diverter head 23 is a frustum-shaped structure with a converging front end and a connecting rear end to the material guiding structure 2. Multiple dispersion holes 24 can be distributed at equal intervals along its circumference. After the lime slurry enters the conical diverter head 23 through the material guiding structure 2, it is dispersed and discharged through the multiple dispersion holes 24. After the coarse-particle calcium carbonate slurry enters the annular flow guide slit 25 through the annular sleeve 21, it is synchronously discharged along the outside of the multiple dispersion holes 24.

[0035] The material guiding structure 2 is set along the length of the horizontal reaction tank 1, the annular sleeve 21 is set around the material guiding structure 2, and the dispersing and distributing structure 22 is set at the front end of the material guiding structure 2 and the annular sleeve 21. Thus, the lime slurry and the coarse-particle calcium carbonate slurry form a relatively clear internal and external stratification before entering the liquid to be treated, that is, the lime slurry is dispersed and discharged on the inner side, and the coarse-particle calcium carbonate slurry is accompanied and discharged on the outer side.

[0036] In actual operation, the pre-treated liquid to be treated is fed into the front end of the horizontal reaction tank 1 through the liquid to be treated inlet 11. The lime slurry enters the material guiding structure 2 through the lime slurry input structure 12 and flows to the front conical diverter head 23. At the same time, the coarse-particle calcium carbonate slurry is fed into the annular sleeve 21 and enters the annular flow guide slit 25.

[0037] It should be noted that the operation process of this embodiment includes the initial start-up stage, the cycle establishment stage, and the continuous return stage. In the initial start-up stage, if there is calcium carbonate seed crystal slurry retained after the previous operation on site, the calcium carbonate seed crystal slurry can be pre-filled into the crystallizing cloth sleeve 13 through the slurry pipe 4, the conveying pipe 41, or the annular sleeve 21 before the liquid to be treated and the lime milk are continuously input, so that the annular sleeve 21 has coarse calcium carbonate slurry that can be discharged along with the lime milk when it starts up.

[0038] Without retaining calcium carbonate seed crystal slurry from the previous run, this embodiment does not require the subsequent return process to be formed immediately upon device startup. Instead, it first enters the dispersion startup stage. During the dispersion startup stage, lime slurry enters the conical diverter head 23 through the material guiding structure 2 and is dispersed into the liquid to be treated through multiple dispersion holes 24. The disturbance mixing structure 14 operates synchronously at low speed, so that the initially generated calcium carbonate particles are kept in a dispersed contact state in the front and middle sections of the horizontal reaction tank 1. After the middle section of the horizontal reaction tank 1 forms a calcium carbonate slurry with a particle size of D50 of 20μm-80μm that can still be pumped, the slurry taking and conveying structure 15 is then turned on, so that the middle coarse-particle calcium carbonate slurry is returned to the crystallizing and feeding sleeve 13 through the slurry taking pipe 4, the conveying pipe 41 and the annular sleeve 21.

[0039] In other words, in the initial stage of startup, this application first reduces the problem of excessive local reaction caused by concentrated introduction of lime slurry at a single point through multiple dispersion holes 24 and disturbance mixing structure 14. After the circulation is established, the crystal induction effect is further improved by the coarse-particle calcium carbonate slurry accompanying the return flow. The initial startup stage, circulation establishment stage and continuous return flow stage are different operating states of the same continuous processing process, and will not affect the technical effect of lime slurry co-flow dispersion and coarse-particle crystal induction return flow in the continuous operation state of this application.

[0040] At the dispersed material distribution structure 22, lime slurry is dispersed and discharged through multiple dispersion holes 24 on the outer periphery of the conical diverter head 23, no longer forming a single concentrated material flow. Meanwhile, coarse-particle calcium carbonate slurry is simultaneously discharged through the annular accompanying flow slit 25 along the outer side of multiple dispersion holes 24. This results in coarse-particle calcium carbonate slurry accompanying the lime slurry on the outer periphery while it is being introduced into the liquid to be treated. After the lime slurry comes into contact with the liquid to be treated, a causticization reaction occurs, generating sodium hydroxide and calcium carbonate.

[0041] It should be noted that in the traditional direct feeding method, lime slurry usually enters the liquid to be treated in a relatively concentrated stream, which can easily form a high reaction intensity in a local area in a short period of time. This causes calcium carbonate to precipitate rapidly near the lime slurry inlet, which can easily lead to local scaling, local encapsulation, and uneven reaction zone.

[0042] In this embodiment, the combination of the conical diverter head 23 and multiple dispersion holes 24 transforms the lime slurry from a single-point concentrated introduction to a multi-point dispersed introduction. At the same time, the coarse-particle calcium carbonate slurry is simultaneously discharged along the outer side of the lime slurry dispersion path through the annular flow guide 25. This significantly reduces the local concentration of lime slurry when it enters the liquid to be treated, and the reaction environment in the front-end reaction zone is more dispersed, which can reduce the local adhesion, local scaling and local encapsulation caused by excessive short-term reaction in local areas.

[0043] Furthermore, the simultaneous discharge of coarse-grained calcium carbonate slurry outside the lime slurry can also provide a surface for existing particles in the front reaction zone, making it easier for newly precipitated calcium carbonate to adhere to the surface of existing particles, rather than forming a large number of disordered fine particles in a localized area. In other words, this embodiment not only improves the way lime slurry enters, but also provides more favorable starting conditions for the subsequent formation of calcium carbonate.

[0044] It should be noted that in this application, coarse-particle calcium carbonate slurry does not refer to calcium carbonate slurry of any particle size, but rather to a returnable calcium carbonate suspension slurry that can be used as a front-end crystallizing and co-flowing material and can be stably extracted by the slurry extraction pipe 4 and transported by the slurry pump. Preferably, the D50 particle size of the calcium carbonate particles in the coarse-particle calcium carbonate slurry is 20μm-80μm, the D90 particle size is not greater than 150μm, and the solid content of the slurry is 5%-20%. Among them, fine particles with a particle size of less than 10μm are mainly dispersed with the upper liquid phase and preferentially discharged from the area where the supernatant discharge structure 16 is located. Calcium carbonate particles with a particle size of greater than 150μm or that have formed obvious agglomeration, deposition, or compaction are mainly settled into the slag collection tank 6 and discharged by the slag discharge structure 17. The slurry extraction pipe 4 extracts the middle calcium carbonate slurry that is located between the upper liquid phase and the lower slag and still has fluidity and pumpability.

[0045] In summary, this application actively changes the way lime slurry enters the liquid to be treated by using the front-end crystallizer sleeve 13, changing the lime slurry addition state from centralized introduction to dispersed introduction with flow, thereby effectively improving the uniformity of the front-end reaction and creating conditions for the orderly formation of calcium carbonate particles in the future. Example 2

[0046] Reference Figure 4 This embodiment provides a continuous separation device for the ecological treatment of alkali residue, which is mainly used to solve the problems in the prior art where the particle state of calcium carbonate after formation is difficult to control effectively, and the subsequent stage is prone to unstable liquid-solid separation, unsatisfactory slurry extraction effect and unsmooth slag discharge.

[0047] A disturbance structure 32 is provided in the middle section of the horizontal reaction tank 1, and a slurry conveying structure 15 is provided in the rear section of the horizontal reaction tank 1. A supernatant discharge structure 16 is provided above the slurry conveying structure 15, and a slag discharge structure 17 is provided below the slurry conveying structure 15. The slurry conveying structure 15 is connected to the crystallizer cloth sleeve 13, so that the particle control process in the rear section of this embodiment can work in coordination with the front reaction process.

[0048] The disturbance mixing structure 14 includes a rotating support structure 3, a driving structure 31, and a disturbance structure 32 disposed outside the rotating support structure 3, which are arranged along the length of the horizontal reaction tank 1. The rotating support structure 3 is preferably a rotating shaft that passes through the middle section of the horizontal reaction tank 1. The driving structure 31 is preferably a motor reduction drive assembly disposed outside the horizontal reaction tank 1. The disturbance structure 32 includes a plurality of disturbance blades 33 that are spaced apart along the length of the rotating support structure 3. The plurality of disturbance blades 33 can be plate-shaped, arc-shaped, or inclined plate-shaped structures and are spaced apart along the outer periphery of the rotating support structure 3 to continuously agitate the middle section slurry during rotation. The rotating shaft and the disturbance blades 33 are preferably made of 316L stainless steel. When the wear resistance requirement is high, a wear-resistant layer can also be provided on the surface of the disturbance blades 33.

[0049] The rotating support structure 3 is rotatably mounted on the horizontal reaction vessel 1 via a bearing seat. A mechanical seal or packing seal is provided at the penetration position between the rotating support structure 3 and the horizontal reaction vessel 1 to prevent leakage of the reaction slurry along the penetration position of the rotating support structure 3. The drive structure 31 is fixedly installed on the outside of the horizontal reaction vessel 1 or on the mounting base. The output end of the drive structure 31 is connected to the rotating support structure 3 via a coupling, sprocket assembly or gear assembly. Multiple disturbance blades 33 are fixedly connected to the rotating support structure 3 respectively. The fixing method can be welding, bolt connection or clamp connection to ensure that the disturbance blades 33 can rotate synchronously with the rotating support structure 3.

[0050] The slurry intake and delivery structure 15 includes an intake pipe 4 and a delivery pipe 41. The intake pipe 4 is fixedly installed on the rear side wall or rear end wall of the horizontal reactor 1. The intake end of the intake pipe 4 extends into the middle area of ​​the rear section of the horizontal reactor 1, preferably located between the supernatant discharge structure 16 and the slag discharge structure 17, and is used to extract coarse-particle calcium carbonate slurry in the middle of the rear section. One end of the delivery pipe 41 is connected to the intake pipe 4, and the other end is connected to the annular sleeve 21, thereby conveying the coarse-particle calcium carbonate slurry in the middle area of ​​the rear section back to the front annular sleeve 21. The connection between the intake pipe 4 and the horizontal reactor 1 can be a flange connection, a welded connection, or a threaded sealing connection. The delivery pipe 41 can be sealed to the intake pipe 4 and the annular sleeve 21 through flanges, clamps, or pipe joints. A slurry pump can be installed on the delivery pipe 41. The inlet end of the slurry pump is connected to the intake pipe 4, and the outlet end of the slurry pump is connected to the delivery pipe 41. The slurry pump is preferably a wear-resistant and alkali-resistant slurry pump.

[0051] To ensure that the slurry sampling pipe 4 can stably extract coarse-grained calcium carbonate slurry from the middle, the center height of the sampling end of the slurry sampling pipe 4 is preferably set at 35%-55% of the effective liquid level height in the horizontal reaction tank 1. The sampling end of the slurry sampling pipe 4 is lower than the weir height of the overflow weir 5 and higher than the upper edge of the slag collection tank 6 by 80mm-200mm, so that the slurry sampling pipe 4 avoids the upper low solid-liquid phase area and the lower slag compaction area. Preferably, the sampling end of the slurry sampling pipe 4 is set as a vertical sampling section, and two to four sets of lateral sampling holes are opened at intervals along the height direction of the vertical sampling section. The lateral sampling holes are set towards the middle slurry area of ​​the horizontal reaction tank 1 and do not directly face the bottom of the slag collection tank 6.

[0052] Meanwhile, when a protective cover is installed on the outside of the slurry pipe 4, an annular slurry inlet gap is formed between the protective cover and the slurry pipe 4. The lower edge of the protective cover is higher than the upper edge of the slag collection tank 6. The protective cover is used to prevent large slag that has obviously agglomerated or settled from directly entering the slurry pipe 4. The slurry pipe 4 simultaneously extracts the middle slurry from different height positions through multiple lateral slurry holes, so that the slurry extraction position does not depend on a single fixed height point. Thus, even when the liquid-solid stratification interface fluctuates up and down with the flow rate, concentration and disturbance state, it is still possible to extract the middle slurry containing coarse calcium carbonate and which is pumpable.

[0053] The slurry pump installed on the conveying pipe 41 is preferably a variable frequency wear-resistant and alkali-resistant slurry pump. The return flow rate of the slurry feeding structure 15 is preferably 5%-25% of the feed flow rate of the liquid to be treated. When the return flow rate is lower than this range, there is insufficient coarse calcium carbonate slurry entering the crystallizing cloth sleeve 13, and the crystallizing effect of the accompanying flow decreases. When the return flow rate is higher than this range, it may disturb the stratification state of the downstream section of the horizontal reaction tank 1. Therefore, by controlling the operating frequency of the slurry pump, the slurry pipe 4 is kept in a low-disturbance continuous slurry feeding state, thereby reducing the disturbance of the upper liquid phase and the lower sediment during the slurry feeding process.

[0054] The supernatant discharge structure 16 includes an overflow weir 5 fixedly installed at the upper rear section of the horizontal reaction tank 1. The overflow weir 5 can be welded or bolted to the inner wall of the horizontal reaction tank 1. An outlet 51 located on one side of the overflow weir 5 is opened on the side wall of the rear section of the horizontal reaction tank 1. The outlet 51 is connected to the drain pipe 52. The drain pipe 52 can be fixed to the outside of the horizontal reaction tank 1 by flange connection or welding connection.

[0055] The slag discharge structure 17 includes a slag collection trough 6 fixedly installed at the lower rear section of the horizontal reactor 1. The slag collection trough 6 can be formed by a downward indentation from the bottom of the horizontal reactor 1, or it can be a tank structure fixedly connected to the bottom of the horizontal reactor 1. One side of the slag collection trough 6 is connected to the slag discharge pipe 61, which is equipped with an opening and closing structure. The opening and closing structure can be a knife gate valve, a ball valve, or a wear-resistant slag discharge valve. The slurry intake end of the slurry intake pipe 4 is located below the overflow weir 5 and above the slag collection trough 6, thereby forming an upper liquid phase discharge zone, a middle slurry extraction zone, and a lower sediment collection and discharge zone in the rear section of the horizontal reactor 1.

[0056] The slag collection trough 6 is preferably a trough-shaped structure extending along the bottom of the horizontal reaction tank 1 to facilitate the collection of sedimented particles at the bottom. The opening and closing structure can be a knife gate valve or a wear-resistant valve to control the discharge of slag. The slurry sampling pipe 4 can be a side-opening slurry sampling end. If necessary, a protective cover can be installed on its outside to reduce the direct entry of larger slag particles into the slurry sampling pipe 4.

[0057] When the slurry sampling pipe 4 adopts a side-opening slurry sampling end, the end of the slurry sampling pipe 4 is closed, and several slurry sampling holes are opened on the side wall of the slurry sampling pipe 4 near the end. The slurry sampling holes are set towards the slurry area in the middle of the horizontal reaction tank 1. The protective cover can be fixedly sleeved on the outside of the slurry sampling end of the slurry sampling pipe 4. An interval space for slurry to enter is formed between the protective cover and the slurry sampling pipe 4 to prevent large pieces of sediment at the bottom from directly rushing into the slurry sampling pipe 4, while ensuring that the coarse calcium carbonate slurry in the middle can enter the slurry sampling pipe 4.

[0058] In actual operation, the slurry formed after the front-end reaction enters the middle section of the horizontal reaction tank 1. Under the action of the disturbance mixing structure 14, multiple disturbance blades 33 rotate with the rotating support structure 3 to continuously agitate the slurry. After being agitated in the middle section, the slurry enters the rear section area, where it gradually forms a stratified state consisting of an upper liquid phase, a middle section containing coarse-particle calcium carbonate slurry, and a lower sediment.

[0059] During continuous operation, the particle size and solids content of the slurry extracted by the slurry pipe 4 can be confirmed by taking samples at regular intervals. The sampling locations include the outlet of the slurry pipe 4, the outlet of the liquid discharge pipe 52, and the outlet of the slag discharge pipe 61. The D50 particle size of the calcium carbonate particles in the sample from the outlet of the slurry pipe 4 is preferably controlled between 20μm and 80μm, and the solids content is preferably controlled between 5% and 20%. The suspended solids content in the sample from the outlet of the liquid discharge pipe 52 is preferably lower than that in the sample from the outlet of the slurry pipe 4. The sample from the outlet of the slag discharge pipe 61 is mainly composed of sedimentary particles or agglomerated sludge with a particle size greater than 150μm. This allows for the differentiation of three different discharge states: the upper liquid phase, the middle coarse-particle calcium carbonate slurry that can be returned, and the lower sludge.

[0060] When the proportion of fine particles in the sample from the outlet of slurry pipe 4 increases or the solids content is lower than the set range, it indicates that the slurry sampling area is biased towards the upper liquid phase region. At this time, reduce the discharge rate of the drain pipe 52 or appropriately reduce the return flow rate of the slurry pump to restore the middle slurry layer. When the proportion of large sludge particles in the sample from the outlet of slurry pipe 4 increases or the load of the slurry pump increases significantly, it indicates that the slurry sampling area is affected by the lower sludge. At this time, increase the sludge discharge frequency of the sludge discharge structure 17 or temporarily reduce the operating frequency of the slurry pump to discharge the lower sludge in a timely manner. Through the above adjustments, the fixed slurry sampling pipe 4 is used in conjunction with the multi-height lateral slurry sampling holes, the variable frequency return flow rate, and the sludge discharge frequency to improve the stability of slurry sampling.

[0061] After the upper liquid phase of the rear section crosses the overflow weir 5, it is discharged from the outlet 51 and the drain pipe 52. The coarse-particle calcium carbonate slurry in the middle area of ​​the rear section is extracted by the slurry extraction pipe 4 and transported back to the front annular sleeve 21 through the conveying pipe 41. The calcium carbonate sludge settled in the lower part of the rear section is collected in the slag collection tank 6 and discharged through the slag discharge pipe 61.

[0062] By combining mid-stage perturbation, rear-stage stratification, and coarse particle return, a cyclical pathway is constructed that promotes the continued growth of calcium carbonate particles.

[0063] Specifically, after calcium carbonate is generated in the causticization reaction, if the system only contains newly generated fine particles without effective control, these fine particles are prone to long-term dispersion and suspension, resulting in unclear liquid-solid interface, fine particles entrained in the upper liquid phase, and unstable sedimentation of the lower sludge. In this embodiment, the slurry extracted and returned from the middle section of the rear section is not arbitrary slurry, but slurry containing more coarse calcium carbonate particles. After these coarse calcium carbonate particles are returned to the front end, they will become the surface on which newly precipitated calcium carbonate preferentially attaches and continues to grow.

[0064] It should be noted that this phenomenon has a clear professional basis. For precipitated particles such as calcium carbonate, when there are already large particle surfaces in the system, newly precipitated calcium carbonate is more likely to adhere to and deposit on the existing particle surfaces. This is a typical heterogeneous nucleation and crystal surface growth process. Compared with the formation of a large number of independent small crystal nuclei, the interfacial energy required to continue deposition on the surface of existing calcium carbonate particles is lower. Therefore, newly added calcium carbonate in the system tends to thicken and grow on the surface of existing particles, or form a more stable larger particle state through continuous contact between particles.

[0065] Meanwhile, the mid-section disturbance mixing structure 14 continuously agitates the slurry, keeping the calcium carbonate particles in motion, contact, and redistribution. This structure is not intended to break up the particles, but rather to prevent them from settling prematurely and to continuously increase the contact opportunities between the particle surface and the surrounding liquid phase, as well as with other particles. In this way, coarse particles can both serve as growth surfaces at the front end to participate in the attachment of new particles and maintain a high contact probability in the mid and rear sections, thereby increasing the possibility of particle aggregation and stratified sedimentation.

[0066] Specifically, this embodiment is achieved based on the following continuous mechanism: New calcium carbonate particles are generated at the front end.

[0067] The coarse-grained calcium carbonate slurry was extracted from the middle section of the latter part.

[0068] After the coarse-grained calcium carbonate slurry is returned to the front end, it provides a preferential attachment and growth surface for newly generated calcium carbonate.

[0069] The mid-section disturbances continue to maintain particle contact and surface growth conditions.

[0070] The coarser particles formed in the later stage are then separated, returned, and discharged as slag.

[0071] During this cycle, the proportion of coarse-grained calcium carbonate in the system gradually increases, making it easier to form a stable partition in the later stage, consisting of an upper liquid phase, a middle section of reusable slurry, and a lower sediment. This not only improves the liquid-solid separation state but also enhances the stability of the supernatant discharge, the reusability of the coarse-grained slurry, and the smoothness of the bottom sediment discharge.

[0072] Therefore, the core creative effect of this embodiment is that it does not rely on a single stirring component or slag discharge component to solve the problem, but actively controls the existence state and subsequent evolution process of calcium carbonate particles by coordinating the overall cooperation of the disturbance mixing structure 14, the slurry conveying structure 15 and the crystallizing cloth sleeve 13, so that calcium carbonate gradually changes from a disordered state in which a large number of fine particles are easily formed to a coarse particle-dominated state that is more conducive to stratification, return and slag discharge.

[0073] In this embodiment, the formation and return of coarse-grained calcium carbonate slurry do not rely on a single instantaneous reaction, but rather on a continuous cyclical process of initiation dispersion, particle generation, subsequent stratification, mid-section slurry extraction, and front-end return. In the initial stage of initiation, lime slurry is first dispersed and introduced through the conical diverter head 23 and multiple dispersion holes 24. After running for a period of time, pumpable coarse-grained calcium carbonate slurry is formed in the mid-section of the subsequent section, and then returned to the annular sleeve 21 by the slurry extraction pipe 4 and the delivery pipe 41. The coarse-grained calcium carbonate slurry is simultaneously discharged along the annular flow guide slit 25 on the outside of the lime slurry, so that the newly precipitated calcium carbonate preferentially adheres and grows on the surface of existing particles, thereby gradually increasing the proportion of settleable and returnable particles in the system.

[0074] In a preferred embodiment, the effective volume of the horizontal reaction tank 1 is 0.5 m³ to 2 m³, the continuous feed flow rate of the liquid to be treated is 0.5 m³ / h to 3 m³ / h, the lime slurry input flow rate is metered according to the sodium carbonate content in the liquid to be treated, the rotation speed of the agitation mixing structure 14 is 20 r / min to 80 r / min, the dispersion stage lasts for 10 min to 30 min, and then the slurry in the middle section of the downstream section is detected. When the calcium carbonate particles D50 in the slurry at the outlet of the slurry pipe 4 reach a particle size of more than 20 μm and the solid content reaches more than 5%, the slurry pump is turned on for continuous return. During the continuous return stage, the return flow rate of the slurry pump is controlled to be 5% to 25% of the feed flow rate of the liquid to be treated, thereby ensuring a stable source of accompanying slurry at the crystallizer cloth sleeve 13.

[0075] The overall working principle of this application is as follows: In actual operation, the liquid to be treated enters from the front end of the horizontal reaction tank 1, and the lime slurry is fed into the dispersing and distributing structure 22 through the material guiding structure 2, and dispersed into the liquid to be treated through multiple dispersing holes 24.

[0076] Simultaneously, the coarse-particle calcium carbonate slurry extracted from the middle section is transported to the dispersion and distribution structure 22 via the annular sleeve 21 and simultaneously discharged along the outer side of the lime slurry dispersion and discharge path. This allows the lime slurry to enter the liquid to be treated in a co-current dispersion manner within the front-end reaction area. This reduces the excessive local reaction caused by concentrated local introduction of lime slurry and introduces existing coarse-particle calcium carbonate onto the surface in the initial reaction area, providing conditions for the subsequent adhesion and growth of newly generated calcium carbonate.

[0077] After the front-end reaction, the slurry enters the middle section of the horizontal reaction tank 1. Under the action of the disturbance mixing structure 14, the calcium carbonate particles in the reaction slurry maintain continuous contact, migration and redistribution, so that the particle surface is in continuous contact with the surrounding liquid phase and the contact probability between particles is increased.

[0078] As the coarse calcium carbonate slurry extracted and returned to the front end continues to participate in the front-end reaction process, the newly precipitated calcium carbonate is more likely to adhere to, grow or aggregate on the surface of existing coarse particles, causing the calcium carbonate particles in the system to gradually change from a fine dispersed state to a larger particle state.

[0079] After entering the rear section of the horizontal reaction tank 1, the slurry gradually forms an upper liquid phase region, a middle coarse-particle calcium carbonate slurry region, and a lower sludge region. The upper liquid phase is discharged through the supernatant discharge structure 16, the middle coarse-particle calcium carbonate slurry is extracted through the slurry conveying structure 15 and sent back to the front crystallizer cloth sleeve 13, and the lower sludge is discharged through the slag discharge structure 17.

[0080] This forms a continuous treatment process involving front-end flow dispersion reaction, mid-stage particle state regulation, and rear-stage liquid-solid stratification, coarse particle return, and sludge discharge.

[0081] In summary, the core of this application does not lie in the independent function of a single structure, but in improving the lime slurry introduction state through the front-end crystallizing sleeve 13, maintaining continuous particle contact and migration conditions through the mid-section disturbance mixing structure 14, and forming a layered treatment path of coarse particle return, liquid phase discharge and sludge discharge through the rear-section slurry conveying structure 15, supernatant discharge structure 16 and slag discharge structure 17. This systematically solves the problems of uneven front-end reaction and fine particle dispersion and unstable liquid-solid separation in the prior art.

[0082] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this application.

Claims

1. A continuous separation device for ecological treatment of alkali residue, comprising a horizontal reaction tank (1), wherein the horizontal reaction tank (1) is fixedly provided with an inlet (11) for the liquid to be treated and a lime slurry input structure (12), characterized in that: The horizontal reaction vessel (1) is fixedly equipped with a crystal-inducing cloth sleeve (13) at its front end. A disturbance mixing structure (14) for agitating and mixing the reaction slurry is movably installed at one end of the horizontal reaction vessel (1) near the crystal-inducing cloth sleeve (13). The disturbance mixing structure (14) is located below the crystal-inducing cloth sleeve (13). A slurry conveying structure (15) for extracting coarse-particle calcium carbonate slurry and conveying it to the crystal-inducing cloth sleeve (13) is connected to one side of the crystal-inducing cloth sleeve (13). A supernatant discharge structure (16) for discharging the liquid phase is fixedly installed at the other end of the horizontal reaction vessel (1) away from the crystal-inducing cloth sleeve (13). A slag discharge structure for discharging sediment is fixedly installed at the bottom of the horizontal reaction vessel (1). In the structure (17), lime milk and coarse calcium carbonate slurry are dispersed and mixed at the crystallizer fabric sleeve (13) into the liquid to be treated and undergo a causticization reaction. After the reaction, the slurry enters the area of ​​the slurry conveying structure (15) after being acted upon by the disturbance mixing structure (14). Subsequently, the supernatant is discharged, the coarse calcium carbonate slurry is returned, and the bottom sediment is discharged. The crystallizer fabric sleeve (13) includes a guide structure (2) for inputting lime milk. An annular sleeve (21) for inputting coarse calcium carbonate slurry is sleeved on the outside of the guide structure (2). The discharge side of the guide structure (2) and the annular sleeve (21) is fixedly connected to a dispersion fabric structure (22) for dispersing lime milk and coarse calcium carbonate slurry into the liquid to be treated.

2. The continuous separation device for ecological treatment of alkali residue according to claim 1, characterized in that: The dispersing structure (22) includes a conical diverter head (23) fixedly connected to the discharge end of the material guiding structure (2). The conical diverter head (23) has multiple dispersing holes (24) on its outer periphery. An annular flow slit (25) is formed between the discharge end of the annular sleeve (21) and the conical diverter head (23) and the conical diverter head (23).

3. The continuous separation device for ecological treatment of alkali residue according to claim 2, characterized in that: Multiple dispersion holes (24) are spaced apart along the circumference of the conical diverter head (23), and the annular flow guide slit (25) is set around the area where multiple dispersion holes (24) are located, so that when lime slurry is dispersed and discharged through multiple dispersion holes (24), coarse calcium carbonate slurry is simultaneously discharged through the annular flow guide slit (25) along the outside of multiple dispersion holes (24).

4. The continuous separation device for ecological treatment of alkali residue according to claim 3, characterized in that: The material guiding structure (2) is fixedly installed along the length of the horizontal reaction tank (1). The annular sleeve (21) is coaxially sleeved on the outside of the material guiding structure (2). The dispersing and distributing structure (22) is fixedly connected to the front end of the material guiding structure (2) and the annular sleeve (21) so that lime slurry is introduced into the dispersing and distributing structure (22) by the material guiding structure (2) and coarse-particle calcium carbonate slurry is introduced into the dispersing and distributing structure (22) by the annular sleeve (21).

5. The continuous separation device for ecological treatment of alkali residue according to claim 1, characterized in that: The disturbance mixing structure (14) includes a rotating support structure (3) that is rotatably arranged along the length of the horizontal reaction tank (1). A drive structure (31) for driving the rotating support structure (3) to rotate is connected to one side of the rotating support structure (3). A disturbance structure (32) for agitating the reaction slurry is fixedly arranged on the outside of the rotating support structure (3).

6. The continuous separation device for ecological treatment of alkali residue according to claim 5, characterized in that: The rotating support structure (3) is rotatably installed through the middle section of the horizontal reaction tank (1). The disturbance structure (32) includes multiple disturbance blades (33) fixedly arranged at intervals along the length of the rotating support structure (3). When the rotating support structure (3) rotates, the multiple disturbance blades (33) move the reaction slurry, so that the calcium carbonate particles in the reaction slurry remain in a dispersed contact state.

7. The continuous separation device for ecological treatment of alkali residue according to claim 1, characterized in that: The slurry delivery structure (15) includes a slurry extraction pipe (4) for extracting coarse-particle calcium carbonate slurry. A delivery pipe (41) for conveying coarse-particle calcium carbonate slurry is connected to one side of the slurry extraction pipe (4). The end of the delivery pipe (41) away from the slurry extraction pipe (4) is connected to an annular sleeve (21). The slurry extraction pipe (4) is fixedly arranged between the supernatant discharge structure (16) and the slag discharge structure (17).

8. The continuous separation device for ecological treatment of alkali residue according to claim 7, characterized in that: The supernatant discharge structure (16) includes an overflow weir (5) fixedly installed at the upper rear section of the horizontal reaction tank (1). An outlet (51) for discharging the upper liquid phase is provided on one side of the overflow weir (5). The outlet (51) is connected to a drain pipe (52) for transporting the liquid phase.

9. The continuous separation device for ecological treatment of alkali residue according to claim 8, characterized in that: The slag discharge structure (17) includes a slag collection tank (6) fixedly installed at the lower rear section of the horizontal reaction tank (1) for collecting slag. A slag discharge pipe (61) for discharging slag is connected to one side of the slag collection tank (6). An opening and closing structure for controlling the discharge of slag is fixedly installed on the slag discharge pipe (61).

10. The continuous separation device for ecological treatment of alkali residue according to claim 9, characterized in that: The slurry-taking end of the slurry-taking pipe (4) is fixedly set below the overflow weir (5). The slurry-taking end of the slurry-taking pipe (4) is set higher than the slag collection tank (6) so that after the upper liquid phase is discharged through the supernatant discharge structure (16), the coarse-particle calcium carbonate slurry in the middle area is drawn through the slurry-taking pipe (4) and transported to the crystallizer cloth sleeve (13), and the lower sediment is discharged through the slag discharge structure (17).

Images