Automatic pH value control device for preparing polyaluminum chloride

Abstract

The utility model discloses an automatic pH value control device for preparing polyaluminum chloride, and belongs to the field of polyaluminum chloride production process control. The device comprises a hydrochloric acid storage tank, a solid feeding port, an acid dissolution reaction kettle, a flocculant storage tank, a flocculation basin, an alkali liquor storage tank, a dropwise adding pump, an actuator, a pH meter, a controller, a polymerization reaction kettle and a curing tank. The acid dissolution reaction kettle with a solid feeding opening in the top is connected with the hydrochloric acid storage tank through a pipeline, a discharging opening of the acid dissolution reaction kettle is connected with a feeding opening of the flocculation basin through the conveying pump, the flocculant storage tank is connected with the flocculation basin through a pipeline, a discharging opening of the flocculation basin is connected with a feeding opening of the polymerization reaction kettle through the conveying pump, and the alkali liquor storage tank is connected with the polymerization reaction kettle. The pH meter arranged in the polymerization reaction kettle is connected with the controller, the actuator is respectively connected with the dropwise adding pump and the controller, and the polymerization reaction kettle is connected with the curing pool through a pipeline. According to the automatic device, tedious manual operation is reduced, and the automation level is improved; and the impurity removal equipment improves the polymerization reaction rate and also increases the purity of the product.

Description

Technical Field

[0001] This utility model relates to an automatic pH control device for the preparation of polyaluminum chloride, belonging to the field of polyaluminum chloride production process control. Background Technology

[0002] In the production of polyaluminum chloride (PAC), pH control is crucial for product quality and process stability. Traditional methods typically rely on manual detection and adjustment of the alkali dripping rate. This method is not only cumbersome but also slow, failing to meet the demands of high-precision, high-efficiency production. Furthermore, the preparation of PAC generates numerous impurities, some of which may react with key components in the reaction system, consuming reactants and reducing the concentration of effective components participating in the polymerization reaction, thus slowing down the reaction rate and lowering the purity of the PAC product. Therefore, developing a device capable of automatically controlling the alkali dripping based on pH and removing impurities is of great significance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an automatic pH control device for the preparation of polyaluminum chloride. The device automatically controls the pH of the reaction solution by controlling the dropwise addition of liquid alkali, and is equipped with a purification device to remove impurities during the reaction process, thereby improving the purity of the reaction solution and the level of automation.

[0004] The technical solution adopted in this utility model is as follows: An automatic pH control device for preparing polyaluminum chloride includes a hydrochloric acid storage tank, a solid feed port, an acid dissolution reactor, a flocculant storage tank, a flocculation tank, an alkali storage tank, a drip pump, an actuator, a pH meter, a controller, a polymerization reactor, and a maturation tank. The solid feed port is located at the top of the acid dissolution reactor, which is connected to the hydrochloric acid storage tank via a pipeline. The outlet of the acid dissolution reactor is connected to the inlet of the flocculation tank via a valve and a feed pump. The flocculant storage tank is connected to the flocculation tank via a valve and a pipeline. The outlet of the flocculation tank is connected to the inlet of the polymerization reactor via a valve and a feed pump. The alkali storage tank is connected to the polymerization reactor via a drip pump. The pH meter installed inside the polymerization reactor is connected to the controller. One end of the actuator is connected to the controller, and the other end is connected to the drip pump. The outlet of the polymerization reactor is connected to the maturation tank via a valve.

[0005] The beneficial effects of this invention are as follows: The pH meter in this device monitors the pH value of the reaction solution in real time and transmits the signal to the controller. The controller then uses the received pH value to control the actuator, adjusting the on / off state of the dripping pump to control the addition of liquid alkali. The device is also equipped with a flocculation tank. By adding flocculant to the reaction solution, impurities in the solution precipitate and are then filtered, resulting in a pure aluminum chloride solution. This device achieves automatic pH monitoring, reducing the tedious manual detection and adjustment, and improving the level of automation. The removal of impurities from the reaction solution not only increases the polymerization rate but also enhances the purity of the polyaluminum chloride product. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of an automatic pH control device for preparing polyaluminum chloride.

[0007] In the diagram: 1. Hydrochloric acid storage tank, 2. Solid feed port, 3. Acid dissolution reactor, 4. Flocculant storage tank, 5. Flocculation tank, 6. Alkali storage tank, 7. Dropping pump, 8. Actuator, 9. pH meter, 10. Controller, 11. Polymerization reactor, 12. Maturation tank. Detailed Implementation

[0008] Figure 1 An automatic pH control device for preparing polyaluminum chloride is provided. The device includes a hydrochloric acid storage tank 1, a solid feed port 2, an acid dissolution reactor 3, a flocculant storage tank 4, a flocculation tank 5, an alkali storage tank 6, a drip pump 7, an actuator 8, a pH meter 9, a controller 10, a polymerization reactor 11, and a maturation tank 12. Solid feed port 2 is located at the top of acid dissolution reactor 3. Acid dissolution reactor 3 is connected to hydrochloric acid storage tank 1 by pipeline. The discharge port of acid dissolution reactor 3 is connected to the inlet of flocculation tank 5 through valve and feed pump. Flocculant storage tank 4 is connected to flocculation tank 5 by pipeline through valve. The discharge port of flocculation tank 5 is connected to the inlet of polymerization reactor 11 through valve and feed pump. Alkali storage tank 6 is connected to polymerization reactor 11 through drip pump 7. pH meter 9 installed inside polymerization reactor 11 is connected to controller 10. Actuator 8 is connected to controller 10 at one end and to drip pump 7 at the other end. The discharge port of polymerization reactor 11 is connected to maturation tank 12 by pipeline through valve.

[0009] When using the above technical solution, the raw materials are first pretreated by crushing and grinding the bauxite to achieve a certain particle size to facilitate the subsequent acid dissolution reaction. The ground bauxite powder is added to the acid dissolution reactor 3 through the solid feed port 2. A certain concentration and amount of hydrochloric acid is added to the acid dissolution reactor 3 by opening the valve at the bottom of the hydrochloric acid storage tank 1 and starting the stirring device. The acid dissolution reaction is carried out under appropriate temperature and stirring conditions. During the reaction, the alumina in the bauxite reacts with the hydrochloric acid to generate an aluminum chloride solution. The valve at the bottom of the acid dissolution reactor 3 is opened, and the aluminum chloride solution is pumped into the flocculation tank 5 through a feed pump. The valve at the bottom of the flocculant storage tank 4 is opened, and an appropriate amount of flocculant or precipitant is added to the flocculation tank 5 and stirred to cause impurities in the solution to precipitate. The precipitate is then separated by filtration or sedimentation to obtain a relatively pure aluminum chloride solution. Open the valve at the bottom of the flocculation tank 5 to transfer the purified aluminum chloride solution to the polymerization reactor 11 via a transfer pump. Liquid alkali from the alkali storage tank 6 is added to the polymerization reactor 11 as a polymerization agent via a drip pump 7. The polymerization reaction proceeds under appropriate temperature and stirring conditions. The pH range required for polyaluminum chloride production is set to pH < 8. During the polymerization reaction, a pH meter 9 monitors the pH value of the reaction solution in real time and transmits the signal to the controller 10. The controller 10 compares the received pH value with the preset pH range. When pH ≥ 8, the controller 10 controls the actuator 8 to shut off the drip pump 7, controlling the dripping of liquid alkali to maintain pH < 8. After the polymerization reaction is complete, open the valve at the bottom of the polymerization reactor 11 to place the reaction product into the maturation tank 12 for maturation. During maturation, the structure of the polyaluminum chloride is further stabilized, and its performance is optimized. The matured polyaluminum chloride product can be dried as needed to produce a solid product.

Claims

1. A pH automatic control device for preparing polyaluminum chloride, comprising a hydrochloric acid storage tank (1), a solid feeding port (2), an acid dissolution reaction kettle (3), an alkali storage tank (6), and a polymerization reaction kettle (11), characterized in that: It further comprises a dripping pump (7), an actuator (8), a pH meter (9), a controller (10), the lye storage tank (6) is connected with the polymerization reactor (11) through the dripping pump (7), the pH meter (9) installed in the polymerization reactor (11) is connected with the controller (10), one end of the actuator (8) is connected with the controller (10), and the other end is connected with the dripping pump (7), the solid feeding port (2) is arranged at the top of the acid-dissolving reactor (3), and the acid-dissolving reactor (3) is connected with the hydrochloric acid storage tank (1) through a pipeline.

2. The apparatus of claim 1, wherein: It further comprises a flocculant storage tank (4) and a flocculation tank (5), the discharge port of the acid-dissolving reactor (3) is connected with the feeding port of the flocculation tank (5) through a valve and a feeding pump, the flocculant storage tank (4) is connected with the flocculation tank (5) through a pipeline, and the discharge port of the flocculation tank (5) is connected with the feeding port of the polymerization reactor (11) through a valve and a feeding pump.

3. The apparatus of claim 2, wherein: It further comprises a maturation tank (12), and the discharge port of the polymerization reactor (11) is connected with the maturation tank (12) through a pipeline.

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