Aluminum sulfate preparation equipment

Abstract

The application provides an aluminum sulfate preparation device, and relates to the technical field of chemical engineering equipment. The aluminum sulfate preparation device comprises a pretreatment unit, a chemical reaction unit and a concentration adjustment unit connected in sequence. The pretreatment unit is provided with at least two premix feeding ports and a premix discharge port, and is used for receiving and mixing materials input from all the premix feeding ports. The chemical reaction unit is provided with at least two reaction feeding ports and a reaction discharge port, one of the reaction feeding ports is communicated with the premix discharge port of the pretreatment unit, and the chemical reaction unit is used for performing chemical reaction on materials input from all the reaction feeding ports to generate slurry. The concentration adjustment unit is provided with at least two slurry adjustment feeding ports and a slurry adjustment discharge port, one of the slurry adjustment feeding ports is communicated with the reaction discharge port of the chemical reaction unit, and the concentration adjustment unit is used for adjusting the concentration of the slurry. The application improves the production equipment to improve the production efficiency and the production capacity.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to an aluminum sulfate preparation device. Background Technology

[0002] In traditional aluminum sulfate production processes, the core equipment typically consists only of preparation tanks and storage tanks. This process has significant drawbacks: it involves multiple steps, making the entire process an intermittent, single-batch operation. Because multiple steps must be completed sequentially in the preparation tank, the next step cannot begin until the previous one is finished. This discontinuous process, with significant waiting time between batches, results in low overall production efficiency and severely limited capacity. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide an aluminum sulfate preparation device that improves production efficiency and increases production capacity by improving the production equipment.

[0004] This application provides the following technical solution: This application provides an aluminum sulfate preparation device, which includes a pretreatment unit, a chemical reaction unit, and a concentration adjustment unit connected in sequence; wherein: The pretreatment unit has at least two premixed feed inlets and a premixed discharge outlet, and the pretreatment unit is used to receive and mix the materials input from all of the premixed feed inlets; The chemical reaction unit has at least two reaction inlets and reaction outlets, wherein one of the reaction inlets is connected to the premixed outlet of the pretreatment unit, and the chemical reaction unit is used to chemically react materials fed from all of the reaction inlets to generate a slurry. The concentration adjustment unit has at least two slurry inlets and slurry outlets, one of which is connected to the reaction outlet of the chemical reaction unit. The concentration adjustment unit is used to adjust the concentration of the slurry.

[0005] In some embodiments, the pretreatment unit includes a premixing tank, the top of which is connected to a premixing inlet and the bottom of which is connected to a premixing outlet.

[0006] In some embodiments, the pretreatment unit further includes a premixing mechanism, which is provided in the premixing tank and is used to mix the materials in the premixing tank.

[0007] In some embodiments, the chemical reaction unit includes at least one reaction tank, the top of which is connected to the reaction inlet and the bottom of which is connected to the reaction outlet.

[0008] In some embodiments, the chemical reaction unit further includes a reaction stirring mechanism, which is provided in the reaction tank and is used to stir the materials in the reaction tank.

[0009] In some embodiments, the chemical reaction unit includes multiple reaction tanks connected in series.

[0010] In some embodiments, the reaction vessel is a reaction vessel with a heat insulation layer on its sidewall and a safety valve.

[0011] In some embodiments, the chemical reaction unit further includes an exhaust gas treatment mechanism, which has an exhaust gas inlet and a purified gas outlet. The exhaust gas inlet is connected to the reaction exhaust gas outlet of the reactor. The exhaust gas treatment mechanism is used to wash, filter, and cool the exhaust gas from the reactor through liquid-phase mass transfer.

[0012] In some embodiments, the concentration adjustment unit includes a slurry preparation tank, the top of which is connected to the slurry preparation inlet, and the bottom of which is connected to the slurry preparation outlet.

[0013] In some embodiments, the aluminum sulfate preparation equipment further includes a filter press unit and a storage unit; wherein, the filter press unit has a filter press inlet and a filter press outlet, the filter press inlet and the slurry outlet are connected, and the filter press unit is used to filter the slurry. The storage unit has a storage inlet, which is connected to the filter press outlet. The storage unit is used to store the slurry after filter press treatment.

[0014] The embodiments of this application have the following advantages: This application provides an aluminum sulfate preparation device, which consists of three main parts connected sequentially: a pretreatment unit, a chemical reaction unit, and a concentration adjustment unit, forming a continuous production line. The pretreatment unit receives at least two materials (e.g., demineralized water and aluminum hydroxide) simultaneously through multiple premix inlets, where preliminary mixing and pretreatment occur to form a homogeneous premixed material, which is then output through a premix outlet. The chemical reaction unit receives the premixed material from the pretreatment unit and can also be supplemented with other reaction components (such as sulfuric acid) through other reaction inlets. Within this unit, the materials undergo a chemical reaction under controlled conditions to generate aluminum sulfate slurry. The concentration adjustment unit receives the slurry from the chemical reaction unit and can add dilution water or regulators through other slurry adjustment inlets to adjust the slurry's concentration, pH value, and other parameters, ultimately outputting a qualified aluminum sulfate product through a slurry adjustment outlet. Throughout the process, the material flows continuously between units, allowing subsequent processes to start without waiting for the previous process to complete, achieving continuous operation from feeding to discharging.

[0015] Therefore, by changing the original batch-based intermittent operation to a continuous process, idle waiting time between processes is eliminated, and synchronous processing of materials is achieved across different units, significantly shortening the production cycle and improving equipment utilization and unit-time capacity. The parallel and collaborative operation of multiple units allows pretreatment, reaction, and concentration adjustment to be performed simultaneously, avoiding the limitations of "one tank at a time" production in traditional processes. This is particularly suitable for large-scale industrial production, resulting in a significant increase in capacity. Each unit functions independently and reaction conditions (such as temperature, pressure, and feed ratio) can be controlled separately, which is beneficial for improving reaction efficiency and product consistency. The concentration adjustment unit can also flexibly adjust product specifications to meet diverse needs. The continuous process reduces the frequency of equipment start-ups and shutdowns, minimizing downtime caused by cleaning, material changes, etc., while also reducing the need for frequent operator intervention, which is conducive to achieving automated control.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an aluminum sulfate preparation apparatus provided in an embodiment of this application is shown.

[0019] Explanation of key component symbols: 100 - Pretreatment unit; 110 - Premix feed inlet; 120 - Premix tank; 130 - Premix stirring mechanism; 200 - Chemical reaction unit; 210 - Reaction inlet; 220 - Reaction tank; 221 - Safety valve; 230 - Reaction stirring mechanism; 300 - Concentration adjustment unit; 310 - Slurry inlet; 320 - Slurry mixing tank; 330 - Slurry mixing mechanism; 400-Filter Press Unit; 500 - Storage unit. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] In this application, unless otherwise expressly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] 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 one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] In traditional aluminum sulfate production processes, the core equipment typically consists only of a preparation tank and a storage tank. This process has significant drawbacks: it involves multiple steps, making the entire process an intermittent, single-batch operation. Because each step must be completed sequentially in the preparation tank, the next step cannot begin until the previous one is finished. This discontinuous batching and significant waiting time result in low overall production efficiency and severely limited capacity.

[0026] As shown in Figure 1, to solve the above-mentioned technical problems, this application provides an aluminum sulfate preparation device, which includes a pretreatment unit 100, a chemical reaction unit 200, and a concentration adjustment unit 300 connected in sequence; wherein: The pretreatment unit 100 has at least two premix inlets 110 and a premix outlet, and the pretreatment unit 100 is used to receive and mix materials input from all of the premix inlets 110; The chemical reaction unit 200 has at least two reaction inlets 210 and reaction outlets, wherein one of the reaction inlets 210 is connected to the premix outlet of the pretreatment unit 100, and the chemical reaction unit 200 is used to chemically react the materials fed from all of the reaction inlets 210 to generate a slurry. The concentration adjustment unit 300 has at least two slurry inlets 310 and slurry outlets, wherein one of the slurry inlets 310 is connected to the reaction outlet of the chemical reaction unit 200, and the concentration adjustment unit 300 is used to adjust the concentration of the slurry.

[0027] These embodiments provide an aluminum sulfate preparation apparatus for achieving continuous production of aluminum sulfate, overcoming the problems of low efficiency and limited capacity in traditional batch processes. The apparatus includes a pretreatment unit 100, a chemical reaction unit 200, and a concentration adjustment unit 300 connected in sequence. The composition and working process are described in detail below, taking into account the structure of each unit and the material flow direction.

[0028] The pretreatment unit 100 includes a premixing tank with a stirring device, and two premixing inlets 110 on its top: the first premixing inlet 110 is used to introduce demineralized water, and the second premixing inlet 110 is used to introduce aluminum hydroxide powder.

[0029] The premix tank has a premix outlet at the bottom, which is connected to the next unit via a pipe. The tank is equipped with a stirring paddle, which is driven by a motor and has an adjustable speed, to fully mix water and aluminum hydroxide powder to form a uniform suspension (i.e., premix slurry).

[0030] For example, in this embodiment, the demineralized water flow rate is controlled at 500 L / h, and aluminum hydroxide powder is continuously added at a rate of 180 kg / h through a screw feeder. After stirring, a premixed slurry with a solid content of about 25% is formed and continuously output through the premixed discharge port.

[0031] The chemical reaction unit 200 includes a corrosion-resistant reactor made of fluoropolymer-lined stainless steel, which possesses excellent acid resistance and sealing properties. Two reaction inlets 210 are located at the top of the reactor. The first reaction inlet 210 is connected to the premixed outlet of the pretreatment unit 100 and is used to receive the premixed slurry; the second reaction inlet 210 is used to introduce concentrated sulfuric acid.

[0032] The reactor is equipped with a high-efficiency stirrer and a temperature sensor (or thermometer) inside, and a reaction outlet is located at the bottom. During the reaction, the temperature is maintained between 0 and 125°C through jacket insulation to prevent violent exothermic reactions that could cause splashing or side reactions.

[0033] In this embodiment, concentrated sulfuric acid is added to the reactor in at least two portions via a metering pump, reacting with the premixed slurry under stirring. Typically, the reaction time is 30 to 45 minutes, generating a high-temperature slurry containing aluminum sulfate, which is continuously discharged through the reaction outlet. Alternatively, demineralized water can be injected into the reactor to initially dilute the high-temperature slurry containing aluminum sulfate and lower its temperature.

[0034] The concentration adjustment unit 300 includes a slurry preparation tank with two slurry preparation inlets 310 on its top: the first slurry preparation inlet 310 is connected to the reaction outlet of the chemical reaction unit 200 and is used to receive high-temperature reaction slurry. The second slurry preparation inlet 310 is used to replenish demineralized water to adjust the final product concentration.

[0035] The mixing tank is equipped with a stirring device and a mixing outlet at the bottom, which connects to the finished product storage tank or packaging system. The slurry concentration is monitored in real time by an online concentration meter, and the water replenishment flow rate is controlled accordingly to ensure that the final aluminum sulfate solution concentration is stabilized at the target concentration, such as 30±0.5%.

[0036] In this embodiment, after the reaction slurry enters the mixing tank, the water flow rate is dynamically adjusted according to the concentration detection results to complete dilution and homogenization, thereby obtaining an aluminum sulfate finished solution that meets industrial standards, which is then continuously output through the mixing outlet.

[0037] Clearly, this application achieves fully continuous operation, meaning that each unit operates in parallel and materials flow continuously without waiting for the previous process to finish. Compared to traditional intermittent production (which takes a long time per batch), this equipment can achieve stable continuous production, increase capacity, reduce unit energy consumption, and significantly improve product quality stability.

[0038] For example, based on the above embodiments, this embodiment adds sensors and a PLC control system to each unit: The pretreatment unit 100 is equipped with a level gauge and a pH sensor.

[0039] The chemical reaction unit 200 is equipped with a temperature sensor, a pressure sensor and a conductivity sensor.

[0040] The concentration adjustment unit 300 is equipped with a density meter and an automatic regulating valve.

[0041] All data is connected to the central control cabinet, enabling automatic closed-loop control of feed flow rate, reaction temperature, and dilution ratio, further improving production stability and safety. The specific operation process can be controlled by staff or by preset parameters.

[0042] In some embodiments, the pretreatment unit 100 includes a premixing tank 120, the top of which is connected to a premixing inlet 110, and the bottom of which is connected to a premixing outlet.

[0043] In these embodiments, the pretreatment unit 100 includes a premixing tank 120 for preliminary mixing of the raw materials.

[0044] For example, the premix tank 120 is a vertical cylindrical container made of 316L stainless steel with a polished inner wall to prevent material from sticking to the wall.

[0045] The premixing tank 120 has at least two premixing inlets 110 at its top: the first premixing inlet 110 is connected to the demineralized water pipeline. The second premixing inlet 110 is connected to the aluminum hydroxide powder screw conveyor. The premixing tank 120 has a premixing outlet at its bottom, which is connected to the chemical reaction unit 200 through a discharge pipe to achieve gravity-fed material discharge.

[0046] After mixing is complete, the premixed slurry flows continuously into the next unit through the bottom premix outlet.

[0047] For example, the bottom of the premix tank 120 is designed with a conical structure, which facilitates material discharge and reduces residue; the premix outlet is equipped with a pneumatic ball valve, which is controlled by a PLC to regulate the flow rate. A dust removal device is installed at the top to prevent aluminum hydroxide powder from being emitted as dust.

[0048] In some embodiments, the pretreatment unit 100 further includes a premixing mechanism 130, which is provided in the premixing tank 120 and is used to stir the materials in the premixing tank 120.

[0049] In these embodiments, the premixing mechanism 130 includes a stirring shaft, stirring blades, and a drive motor. The stirring shaft is vertically disposed inside the premixing tank 120, and its top protrudes from the top of the tank through a sealed bearing and is connected to the drive motor.

[0050] For example, the stirring blades are three-bladed propellers, installed at the lower part of the stirring shaft, and located in the material mixing area.

[0051] For example, the drive motor is a variable frequency motor.

[0052] During continuous operation, demineralized water and aluminum hydroxide powder enter the premixing tank 120 simultaneously from the top feed inlet. The premixing stirring mechanism 130 is immediately activated to forcibly stir the materials, forming a uniform suspension and preventing the aluminum hydroxide powder from settling or clumping. The uniformly mixed slurry flows continuously into the chemical reaction unit 200 under gravity through the bottom premixing outlet.

[0053] In some embodiments, the chemical reaction unit 200 includes at least one reaction tank 220, the top of which is connected to the reaction inlet 210, and the bottom of which is connected to the reaction outlet.

[0054] In this embodiment, the chemical reaction unit 200 includes at least one reaction tank 220, which serves as the core equipment for the neutralization reaction between sulfuric acid and aluminum hydroxide.

[0055] For example, the reaction tank 220 is a corrosion-resistant vertical container made of fluoropolymer-lined stainless steel. The top of the reaction tank 220 has at least two reaction inlets 210: the first reaction inlet 210 is connected to the premixed discharge port of the pretreatment unit 100 and is used to receive the premixed slurry; the second reaction inlet 210 is used to introduce concentrated sulfuric acid, with the flow rate precisely controlled by an acid-resistant metering pump. The bottom of the reaction tank 220 has a reaction discharge port, which is connected to the concentration adjustment unit 300 via a pipe, enabling continuous discharge of the reacted slurry.

[0056] For example, the reaction tank 220 is equipped with a reaction stirring mechanism 230, which includes a stirring shaft and anchor-type stirring blades, driven by a top motor to ensure that the reactants are fully mixed.

[0057] Optionally, the reaction tank 220 is equipped with a temperature sensor and a pH probe to monitor the reaction status in real time.

[0058] In some embodiments, the chemical reaction unit 200 further includes a reaction stirring mechanism 230, which is provided in the reaction tank 220 and is used to stir the materials in the reaction tank 220.

[0059] In these embodiments, the top of the reaction tank 220 is provided with at least two reaction inlets 210. The first reaction inlet 210 is connected to the premixed outlet of the pretreatment unit 100 and is used to receive the premixed slurry.

[0060] The reaction stirring mechanism 230 includes a stirring shaft, stirring blades, and a drive motor. The stirring shaft is vertically installed inside the reaction tank 220, and its top protrudes from the top of the tank through a mechanical seal and is connected to the drive motor. The stirring blades are an anchor-type configuration with an upward-pushing propeller composite structure, which can both prevent material settling and promote vertical circulation.

[0061] During the reaction, the premixed slurry and concentrated sulfuric acid are combined in the reaction tank 220. The reaction stirring mechanism 230 is immediately started to forcibly stir the mixture, ensuring that the acid and alkali are in full contact, avoiding local over-acidity or over-alkaliness, and improving the reaction uniformity and conversion rate.

[0062] In some embodiments, the chemical reaction unit includes multiple reaction tanks 220 connected in series.

[0063] In these embodiments, the chemical reaction unit 200 includes multiple reaction tanks 220 connected in series, specifically a first reaction tank 220 and a second reaction tank 220, which are connected by pipes to form a continuous reaction process.

[0064] The first reaction tank 220 has two reaction inlets 210 at its top. The first reaction inlet 210 is connected to the premixed discharge outlet of the pretreatment unit 100 and is used to receive the premixed slurry. The second reaction inlet 210 is used to introduce a portion of concentrated sulfuric acid. The first reaction tank 220 is equipped with a first reaction stirring mechanism 230 inside. A discharge outlet is located at the bottom and is connected to the top of the second reaction tank 220 via a pipe for preliminary reaction.

[0065] The top of the second reaction tank 220 is provided with a third reaction inlet 210 for adding the remaining concentrated sulfuric acid and receiving the intermediate reaction slurry from the first reaction tank 220; the interior is provided with a second reaction stirring mechanism 230. The bottom of the second reaction tank 220 is provided with a reaction outlet for discharging the aluminum sulfate slurry that has completed the reaction, so as to carry out a deep reaction.

[0066] Workflow: The premixed slurry and a portion of the sulfuric acid enter the first reaction tank 220 to begin the reaction. The slurry after the initial reaction flows into the second reaction tank 220. The remaining sulfuric acid is added to the second tank to complete the deep reaction. Finally, the slurry exits through the reaction outlet into the concentration adjustment unit 300.

[0067] Obviously, it's crucial to avoid localized over-acidity, intense exothermic reactions, and side reactions caused by adding acid all at once. Extending the total reaction time increases the conversion rate of aluminum hydroxide. Furthermore, a low initial temperature suppresses side reactions, while a high subsequent temperature promotes complete reaction.

[0068] In some embodiments, the reaction tank 220 is a reaction vessel with a heat insulation layer on the side wall and a safety valve 221.

[0069] In these embodiments, the specific implementation of the reaction tank 220 is engineered and optimized. The reaction tank 220 is specifically a reaction vessel, and an insulation layer and a safety valve 221 are further configured to improve the thermal efficiency, operational stability and intrinsic safety of the equipment.

[0070] The reactor has a reaction inlet 210 at the top and a reaction outlet at the bottom, and a reaction stirring mechanism 230 inside, with the same structure and function as before.

[0071] The side walls and bottom jacket of the reactor are provided with an insulation layer. For example, the insulation layer is composed of aluminum silicate fiber felt wrapped with a thin stainless steel plate. The insulation layer covers the outer surface of the reactor body and jacket, leaving only the top flange, instrument interface and discharge port exposed.

[0072] Clearly, this method can reduce heat loss during the reaction, maintain a stable reaction temperature, and thus, in conjunction with the heat generated by the reaction, eliminate the need for additional high-temperature steam, thereby achieving the goal of energy conservation and consumption reduction.

[0073] The reactor is equipped with a safety valve 221 at the top. For example, the safety valve 221 is a spring-loaded safety valve, model A27W-10T, with a nominal pressure of 1.0 MPa and a set opening pressure of 0.3 MPa. Typically, the reactor operates at a pressure not exceeding 0.18 MPa and a temperature not exceeding 125°C.

[0074] Safety valve 221 is vertically installed at the highest point of the top end cap of the reactor via a flange interface.

[0075] The discharge outlet is connected to an acid gas absorption device (such as an alkaline spray tower or a three-wash water pool) to prevent sulfuric acid mist from being directly emitted and polluting the environment.

[0076] In some embodiments, the chemical reaction unit 200 further includes a waste gas treatment mechanism, which has a waste gas inlet and a purified gas outlet. The waste gas inlet is connected to the reaction waste gas outlet of the reactor. The waste gas treatment mechanism is used to wash, filter, and cool the waste gas from the reactor through liquid phase mass transfer.

[0077] In these embodiments, the chemical reaction unit 200 is upgraded for environmental protection: an exhaust gas treatment mechanism is added to treat the acidic exhaust gas generated during the reaction process, thereby achieving clean production.

[0078] During the reaction of sulfuric acid and aluminum hydroxide, a small amount of acidic waste gas is generated due to the exothermic reaction and the water content of the raw materials. The main components are water vapor, sulfuric acid droplets, and a small amount of incompletely absorbed SO2 gas. This waste gas is discharged through the reaction waste gas outlet located at the top of the reactor. The reaction waste gas outlet is located next to safety valve 221 or shares a venting pipeline, but after branching, it is preferentially directed to the waste gas treatment mechanism.

[0079] The waste gas treatment unit includes a waste gas inlet and a purified gas outlet, and integrates washing, cooling and filtration functional modules.

[0080] The exhaust gas inlet is connected to the reaction exhaust port of the reactor via an acid-resistant pipe (such as PP material). The purified gas outlet is connected to the plant's ventilation system or a high-altitude emission pipe. The entire exhaust gas treatment system is a closed structure to ensure no leakage.

[0081] For example, the waste gas treatment unit adopts a three-wash water tank and uses a liquid phase mass transfer method to achieve the washing, cooling and filtration of waste gas through multi-stage synergistic action.

[0082] In some embodiments, the concentration adjustment unit 300 includes a slurry preparation tank 320, the top of which is connected to the slurry preparation inlet 310, and the bottom of which is connected to the slurry preparation outlet.

[0083] In these embodiments, the mixing tank 320 is a vertical cylindrical container with a polished inner wall to prevent material residue.

[0084] The top of the slurry preparation tank 320 is provided with at least two slurry preparation inlets 310. The first slurry preparation inlet 310 is connected to the reaction outlet of the chemical reaction unit 200 via a pipe and is used to receive high-temperature aluminum sulfate slurry from the reactor. The second slurry preparation inlet 310 is used to introduce demineralized water or dilute sulfuric acid solution for dilution or pH adjustment. The bottom of the slurry preparation tank 320 is provided with a slurry preparation outlet, which is connected to the finished product storage tank or packaging system via a pipe to achieve continuous discharge of the finished product.

[0085] For example, the mixing tank 320 is equipped with a mixing mechanism 330, which includes a mixing shaft and a propeller-type mixing blade, driven by a top motor to ensure that the added dilution water and the high-temperature slurry are mixed quickly and evenly.

[0086] For example, the tank is equipped with a temperature sensor and an online concentration meter (such as a refractometer or densitometer) to monitor the slurry temperature and concentration in real time. The signal from the online concentration meter is connected to the automatic control system, which provides feedback to adjust the makeup water flow rate at the second slurry feed inlet 310, thereby achieving closed-loop concentration control.

[0087] In some embodiments, the aluminum sulfate preparation equipment further includes a filter press unit 400 and a storage unit 500; wherein the filter press unit 400 has a filter press inlet and a filter press outlet, the filter press inlet and the slurry outlet are connected, and the filter press unit 400 is used to filter the slurry.

[0088] The storage unit 500 has a storage inlet and is connected to the filter press outlet. The storage unit 500 is used to store the slurry after filter press treatment.

[0089] In these embodiments, the post-processing flow of the aluminum sulfate preparation equipment is extended: a pressure filter unit 400 and a storage unit 500 are added for solid-liquid separation and temporary storage of the finished slurry after slurry preparation, to meet the industrial demand for aluminum sulfate solutions with low suspended solids and high clarity.

[0090] The filter press unit 400 includes a filter press, which can be a plate and frame filter press or a chamber filter press, and the main body material is reinforced polypropylene (acid corrosion resistant). The filter press unit 400 is equipped with a filter press inlet and a filter press outlet (for filtrate outlet). The filter press inlet is connected to the slurry outlet of the concentration adjustment unit 300 via an acid-resistant pipe (such as UPVC or PP material). The slurry is continuously or in batches fed into the filter press by a delivery pump (such as a diaphragm pump).

[0091] Working process: The prepared aluminum sulfate slurry enters the filter press chamber. A pressure of 0.6–1.0 MPa is applied, forcing the liquid through the filter cloth while solid impurities (such as unreacted aluminum hydroxide particles, silica sand carried in by the raw material, etc.) are trapped in the filter chamber. The filtered, clarified aluminum sulfate solution is discharged from the filter press outlet. The filter cake is periodically removed and can be recycled or disposed of in a harmless manner.

[0092] Storage unit 500 includes a finished product storage tank for temporary or long-term storage of the filtered finished product solution.

[0093] The storage unit 500 is provided with a storage inlet and a storage outlet, the storage outlet being used to connect to a packaging machine or a conveying system.

[0094] The storage inlet is connected to the filter outlet of the filter press unit 400 via a pipeline. The filtered clarified liquid flows by gravity or is pumped into the finished product storage tank.

[0095] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0096] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An aluminum sulfate preparation apparatus, characterized in that, The aluminum sulfate preparation equipment includes a pretreatment unit, a chemical reaction unit, and a concentration adjustment unit connected in sequence; wherein: The pretreatment unit has at least two premixed feed inlets and a premixed discharge outlet, and the pretreatment unit is used to receive and mix the materials input from all of the premixed feed inlets; The chemical reaction unit has at least two reaction inlets and reaction outlets, wherein one of the reaction inlets is connected to the premixed outlet of the pretreatment unit, and the chemical reaction unit is used to chemically react materials fed from all of the reaction inlets to generate a slurry. The concentration adjustment unit has at least two slurry inlets and slurry outlets, one of which is connected to the reaction outlet of the chemical reaction unit. The concentration adjustment unit is used to adjust the concentration of the slurry.

2. The aluminum sulfate preparation equipment according to claim 1, characterized in that, The pretreatment unit includes a premixing tank, the top of which is connected to the premixing inlet, and the bottom of which is connected to the premixing outlet.

3. The aluminum sulfate preparation equipment according to claim 2, characterized in that, The pretreatment unit further includes a premixing and stirring mechanism, which is provided in the premixing tank and is used to stir the materials in the premixing tank.

4. The aluminum sulfate preparation equipment according to claim 1, characterized in that, The chemical reaction unit includes at least one reaction tank, the top of which is connected to the reaction inlet and the bottom of which is connected to the reaction outlet.

5. The aluminum sulfate preparation equipment according to claim 4, characterized in that, The chemical reaction unit also includes a reaction stirring mechanism, which is provided in the reaction tank and is used to stir the materials in the reaction tank.

6. The aluminum sulfate preparation equipment according to claim 4, characterized in that, The chemical reaction unit comprises multiple reaction tanks connected in series.

7. The aluminum sulfate preparation equipment according to claim 4, characterized in that, The reaction vessel is a reaction vessel, the side wall of which has a heat insulation layer, and the reaction vessel has a safety valve.

8. The aluminum sulfate preparation equipment according to claim 7, characterized in that, The chemical reaction unit also includes a waste gas treatment mechanism, which has a waste gas inlet and a purified gas outlet. The waste gas inlet is connected to the reaction waste gas outlet of the reactor. The waste gas treatment mechanism is used to wash, filter, and cool the waste gas from the reactor through liquid phase mass transfer.

9. The aluminum sulfate preparation equipment according to claim 1, characterized in that, The concentration adjustment unit includes a slurry preparation tank, the top of which is connected to the slurry preparation inlet, and the bottom of which is connected to the slurry preparation outlet.

10. The aluminum sulfate preparation equipment according to claim 9, characterized in that, The aluminum sulfate preparation equipment further includes a filter press unit and a storage unit; wherein, the filter press unit has a filter press inlet and a filter press outlet, the filter press inlet and the slurry outlet are connected, and the filter press unit is used to filter the slurry. The storage unit has a storage inlet, which is connected to the filter press outlet. The storage unit is used to store the slurry after filter press treatment.

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