Cadmium Waste Residue Recovery System Based on Chaotic Variable-Speed Stirring Technology

Abstract

The present invention belongs to the technical field of chemical engineering equipment, and provides a cadmium waste residue recovery system based on chaotic variable-speed stirring technology, including an intermediate water tank; an electrochemical treatment unit, the water outlet of the intermediate water tank is communicated with the water inlet of the electrochemical treatment unit, and the electrochemical treatment unit performs electrochemical treatment on sewage through electrochemical treatment technology; a chaotic stirring and flocculation unit, the water inlet of the chaotic stirring and flocculation unit is connected to the water outlet of the electrochemical treatment unit, and the chaotic stirring and flocculation unit is used for flocculating sewage containing impurity ions; a post-treatment unit, the water inlet of the post-treatment unit is communicated with the water outlet of the chaotic stirring and flocculation unit, and the post-treatment unit is used for separating the flocculated sewage to finally obtain clarified liquid. The present invention realizes the effective purification and recovery treatment of cadmium-containing sewage through the overall planning and design of electrochemical treatment technology and ion exchange technology, and through chaotic variable-speed stirring technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical equipment, and particularly relates to a cadmium waste residue recovery system based on chaotic variable-speed stirring technology. Background Art

[0002] Many harmful elements and their compounds are discharged into water bodies along with the development of industrial production, leading to serious water pollution problems. Among such problems, heavy metal pollution is very prominent. The main sources of heavy metal water pollution include industrial fields such as metallurgy and chemical engineering. Common heavy metals causing water pollution include cadmium, copper, zinc, lead, etc. Among them, cadmium (Cd) is a highly toxic substance that has toxic biological effects even at concentrations almost smaller than those of any common mineral, and due to its widespread existence, it is easily dissolved and transported in water, becoming an important cause of environmental pollution. At present, the treatment methods for cadmium-containing wastewater include physical methods and chemical methods. The ion exchange technology in physical methods and the electrochemistry technology in chemical methods can be used to achieve the efficient removal of heavy metals in water. The main purpose of using mechanical stirring in the flocculation stage is to make the materials mix fully and improve the working efficiency of the next-stage process. There are generally two different types of mixing regions in the flocculation tank: a chaotic mixing region and an isolated mixing region. The existence of the isolated mixing region limits the mass transfer process of the materials, resulting in a decrease in the quality of the final product. Increasing the chaotic mixing region is an important way to improve the mixing and stirring of materials in different regions and reduce the energy consumption during the stirring process. Optimizing the heavy metal sewage treatment process has great application prospects in achieving the process goal of energy conservation and emission reduction. Summary of the Invention

[0003] The purpose of the present invention is to provide a cadmium waste residue recovery system based on chaotic variable-speed stirring technology to solve the above problems, and achieve the purpose of effectively purifying and recovering cadmium-containing sewage through the overall planning and design of electrochemistry treatment technology and ion exchange technology, and through chaotic variable-speed stirring technology.

[0004] To achieve the above purpose, the present invention provides the following solution: A cadmium waste residue recovery system based on chaotic variable-speed stirring technology, comprising:

[0005] An intermediate water tank;

[0006] An electrochemistry treatment unit, the water outlet of the intermediate water tank is communicated with the water inlet of the electrochemistry treatment unit, and the electrochemistry treatment unit performs electrochemistry treatment on sewage through electrochemistry treatment technology;

[0007] A chaotic stirring and flocculation unit, the water inlet of the chaotic stirring and flocculation unit is connected to the water outlet of the electrochemistry treatment unit, and the chaotic stirring and flocculation unit is used for flocculation treatment of sewage containing impurity ions;

[0008] A post-treatment unit, the water inlet of the post-treatment unit is connected to the water outlet of the chaotic stirring and flocculation unit, and the post-treatment unit is used for separating the sewage after flocculation treatment to finally obtain clarified liquid.

[0009] Preferably, the electrochemical treatment unit includes a parallel electrochemical pump and an electrochemical system. The water outlet of the intermediate water tank is connected to the water inlet of the electrochemical system through the parallel electrochemical pump. The electrochemical system is used for removing metal ions in the sewage and monitoring the content of cadmium metal in the sewage. The water outlet of the electrochemical system is connected to the water inlet of the chaotic stirring and flocculation unit.

[0010] Preferably, the chaotic stirring and flocculation unit includes an aeration tank and a stirring and flocculation tank. The water inlet of the aeration tank is connected to the water inlet of the aeration tank. The water outlet of the aeration tank is connected to the water inlet of the stirring and flocculation tank. A chaotic stirring part is arranged in the stirring and flocculation tank. The chaotic stirring part stirs the sewage at a chaotic rotation speed to form larger flocs in the sewage. The water outlet of the stirring and flocculation tank is connected to the post-treatment unit.

[0011] Preferably, the chaotic stirring part includes a motor, a rotation speed sensor and a chaotic control circuit. The motor is vertically arranged at the center of the top of the stirring and flocculation tank. One end of a stirring shaft is fixedly connected coaxially with the output shaft of the motor. The other end of the stirring shaft is fixedly connected with a stirring paddle. The stirring paddle is immersed in the stirring and flocculation tank. The rotation speed sensor is arranged corresponding to the stirring shaft. The rotation speed sensor is used for monitoring the rotation speed of the stirring shaft. The motor and the rotation speed sensor are respectively electrically connected to the chaotic control circuit.

[0012] Preferably, the stirring paddle includes two groups of radial blades and four groups of axial blades. The two groups of radial blades are fixedly connected in sequence from top to bottom at the end of the stirring shaft away from the motor. The four groups of axial blades are respectively vertically fixedly connected between the two groups of radial blades. The four groups of axial blades are evenly distributed on the radial blades.

[0013] Preferably, the chaotic control circuit includes a chaotic mapping control element, a speed input element and a speed output element. The speed input element is electrically connected to the rotation speed sensor. The speed output element is electrically connected to the motor. The chaotic mapping control element is used for analyzing the value transmitted by the speed input element and controlling the rotation speed of the motor through the speed output element.

[0014] Preferably, the chaotic rotation speed controlled by the chaotic mapping control element (15)

[0015]

[0016] In the formula, is the base speed, that is, the speed at which the motor operates stably collected by the rotation speed sensor, is the speed boundary; is the chaos control term, that is, the chaos sequence generated by the chaos mapping.

[0017] Preferably, the post-treatment unit includes a thickener, a clarifier and a neutralization tank. The water inlet of the thickener is communicated with the water outlet of the stirring and flocculation tank. The upper part of the thickener is communicated with the clarifier through a pipeline. The bottom of the thickener is communicated with the neutralization tank through a sludge pump. The clarifier is used to obtain the final upper clarified liquid, and the neutralization tank is used to perform acid-base neutralization treatment on the treated sewage.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects: The main function of the intermediate water tank is to temporarily store the cadmium-containing sewage generated during production; the main function of the electrochemical treatment unit is to adjust and remove the elements in the cadmium-containing sewage flowing into the intermediate water tank, and to monitor the cadmium metal content in the cadmium-containing sewage in real time; the main function of the chaotic stirring and flocculation unit is to quickly form larger flocs in the sewage treated by the electrochemical treatment unit, improve the subsequent precipitation effect and purification efficiency; the main function of the post-treatment unit is to separate the clarified liquid from the flocculated sewage and neutralize the sludge. Overall, the present invention realizes the effective purification and recovery treatment of cadmium-containing sewage through the overall planning and design of electrochemical treatment technology and ion exchange technology. In the ion exchange technology, the method of strengthening mechanical stirring is adopted, and the chaotic rotation speed is used for flocculation operation, achieving the effects of more accurate chaotic stirring rotation speed range, wide blade action range and strong stirring and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is the operation flow chart of the cadmium waste residue recovery system of the present invention;

[0021] Figure 2 is the connection schematic diagram of the cadmium waste residue recovery system of the present invention;

[0022] Figure 3 is the schematic diagram of the chaotic stirring and flocculation unit of the present invention;

[0023] Figure 4 is the schematic diagram of the stirring paddle of the present invention;

[0024] Figure 5 This is the chaotic speed diagram of the motor of the present invention;

[0025] Among them, 1. Intermediate water tank; 2. Parallel electrochemical pump; 3. Electrochemical system; 4. Aeration tank; 5. Stirring and flocculation tank; 6. Stirring paddle; 7. Chaotic control circuit; 8. Motor; 9. Stirring shaft; 10. Speed sensor; 11. Thickening tank; 12. Sludge pump; 13. Clarification tank; 14. Neutralization tank; 15. Chaotic mapping control element; 16. Speed input element; 17. Speed output element; 18. Radial blade; 19. Axial blade. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Referring to Figures 1-5 as shown, the present invention provides a cadmium waste residue recovery system based on chaotic variable-speed stirring technology, including:

[0029] Intermediate water tank 1;

[0030] Electrochemical treatment unit, the water outlet of the intermediate water tank 1 is communicated with the water inlet of the electrochemical treatment unit, and the electrochemical treatment unit performs electrochemical treatment on the sewage through electrochemical treatment technology;

[0031] Chaotic stirring and flocculation unit, the water inlet of the chaotic stirring and flocculation unit is connected to the water outlet of the electrochemical treatment unit, and the chaotic stirring and flocculation unit is used for flocculation treatment of the sewage containing impurity ions;

[0032] Post-treatment unit, the water inlet of the post-treatment unit is communicated with the water outlet of the chaotic stirring and flocculation unit, and the post-treatment unit is used for separating the flocculated sewage to finally obtain clarified liquid.

[0033] The main function of the intermediate water tank 1 is to temporarily store the cadmium-containing sewage generated during production; the main function of the electrochemical treatment unit is to adjust and remove the elements in the cadmium-containing sewage flowing into the intermediate water tank 1, and to monitor the cadmium metal content in the cadmium-containing sewage in real time; the main function of the chaotic stirring and flocculation unit is to quickly form larger flocs in the sewage treated by the electrochemical treatment unit, improve the later precipitation effect and the purification efficiency; the main function of the post-treatment unit is to separate the clarified liquid from the flocculated sewage and to neutralize the sludge. Overall, the present invention realizes the effective purification and recovery treatment of cadmium-containing sewage through the overall planning and design of electrochemical treatment technology and ion exchange technology. In the ion exchange technology, an enhanced mechanical stirring method is adopted, and the chaotic rotation speed is used for flocculation operation, achieving the effects of a more accurate chaotic stirring speed range, a wide range of impeller action, and a strong stirring and mixing effect.

[0034] In a further optimized scheme, the electrochemical treatment unit includes a parallel electrochemical pump 2 and an electrochemical system 3. The outlet of the intermediate water tank 1 is connected to the inlet of the electrochemical system 3 through the parallel electrochemical pump 2. The electrochemical system 3 is used to remove metal ions in the sewage and monitor the cadmium metal content in the sewage. The outlet of the electrochemical system 3 is connected to the inlet of the chaotic stirring and flocculation unit.

[0035] The parallel electrochemical pump 2 adopts a multi-stage parallel mode, which can keep the cadmium-containing sewage flowing into the electrochemical system 3 from the intermediate water tank 1 in a large flow and continuously. The parallel mode can improve the conveying efficiency. The liquid storage device and the ion exchange membrane provided in the parallel electrochemical pump 2 can effectively adjust the element content in the cadmium-containing sewage. The ion exchange membrane can control the passage of ions, filter out unnecessary ions, avoid damage to the mechanical components of the pump body during transportation, and improve the stability of the continuous operation of the pump body.

[0036] The electrochemical system 3 adopts an HSJ - electrochemical system. The HSJ - electrochemical system is a wastewater treatment technology that uses electric energy instead of chemical reagents and membrane materials. It has a modular design, can well remove metal ions in the cadmium-containing sewage, and can realize the function of real-time monitoring of the cadmium metal content in the cadmium-containing sewage.

[0037] In a further optimized scheme, the chaotic stirring and flocculation unit includes an aeration tank 4 and a stirring and flocculation tank 5. The inlet of the aeration tank 4 is connected to the inlet of the aeration tank 4. The outlet of the aeration tank 4 is connected to the inlet of the stirring and flocculation tank 5. A chaotic stirring part is arranged in the stirring and flocculation tank 5. The chaotic stirring part stirs the sewage at a chaotic rotation speed to form larger flocs in the sewage. The outlet of the stirring and flocculation tank 5 is connected to the post-treatment unit.

[0038] Such as Figure 2As shown in the figure, the stirring and flocculation tank 5 is arranged on the outlet side of the aeration tank 4 and is directly superposed and connected with the aeration tank 4 by means of a draft tube. The aeration tank 4 adopts a compressed air aeration process, and a separate water inlet compartment is used to improve the aeration degree of the sewage, enhance the oxygenation capacity in the sewage, and slow-release the organic matter concentration in the sewage.

[0039] In a further optimized solution, the chaotic stirring part includes a motor 8, a rotational speed sensor 10, and a chaotic control circuit 7. The motor 8 is vertically arranged at the center of the top of the stirring and flocculation tank 5. One end of a stirring shaft 9 is fixedly connected coaxially with the output shaft of the motor 8. The other end of the stirring shaft 9 is fixedly connected with a stirring paddle 6. The stirring paddle 6 is immersed in the stirring and flocculation tank 5. The rotational speed sensor 10 is arranged corresponding to the stirring shaft 9. The rotational speed sensor 10 is used to monitor the rotational speed of the stirring shaft 9. The motor 8 and the rotational speed sensor 10 are respectively electrically connected to the chaotic control circuit 7.

[0040] The motor 8 is a three-phase asynchronous motor with a large rotational power, which can better meet the requirements of the stirring operation.

[0041] As Figure 3 shown, when it is necessary to perform stirring and flocculation operations on the sewage in the stirring and flocculation tank 5, the chaotic control circuit 7 controls the motor 8 to rotate. The rotation of the motor 8 drives the stirring shaft 9 to rotate. When the stirring shaft 9 rotates, it drives the stirring paddle 6 to rotate in the sewage to stir the sewage. The chaotic control circuit 7 controls the rotational speed of the motor 8 through the rotational speed information of the stirring shaft 9 transmitted by the rotational speed sensor 10 to achieve the effect of stirring at a chaotic rotational speed.

[0042] In a further optimized solution, the stirring paddle 6 includes two groups of radial blades 18 and four groups of axial blades 19. The two groups of radial blades 18 are fixedly connected in sequence from top to bottom at one end of the stirring shaft 9 away from the motor 8. The four groups of axial blades 19 are respectively vertically fixedly connected between the two groups of radial blades 18. The four groups of axial blades 19 are evenly distributed on the radial blades 18.

[0043] By setting the stirring paddle 6 in the form of a frame-type mechanical stirring paddle composed of two groups of radial blades 18 and four groups of axial blades 19, it has the characteristics of strong structural stability and large stirring range. The swirling stirring of this stirring paddle is used to enhance the mixing flow intensity of the highly viscous fluid in the flocculation tank, effectively enhance the axial flow effect of the highly viscous fluid, and can enhance the mixing effect of the flocculant and thickener in the stirring and flocculation tank 5 with the fluid, further improving the efficiency and flocculation effect of the sewage flocculation process.

[0044] For a further optimized solution, the chaos control circuit 7 includes a chaos mapping control element 15, a speed input element 16, and a speed output element 17. The speed input element 16 is electrically connected to the rotational speed sensor 10, and the speed output element 17 is electrically connected to the motor 8. The chaos mapping control element 15 is used to analyze the value transmitted by the speed input element 16 and control the rotational speed of the motor 8 through the speed output element 17.

[0045] The chaos mapping control element 15 is generated by the Chua's circuit. The Chua's circuit is a simple non-linear electronic circuit design that can exhibit chaos theory. Its energy storage elements are two capacitors and an inductor, there is an active resistor, a non-linear resistor made of two diodes, and a negative impedance converter, which is composed of three linear resistors and an operational amplifier.

[0046] For a further optimized solution, the chaotic rotational speed controlled by the chaos mapping control element 15 has the expression of

[0047]

[0048] In the formula, is the base speed, that is, the speed at which the motor 8 operates stably collected by the rotational speed sensor 10, is the speed boundary; is the chaos control term, that is, the chaotic sequence generated by the chaos mapping.

[0049] As Figure 3 [[ID=Z5]]shown, the rotational speed sensor 10 collects the rotational speed signal of the stirring shaft 9 and feeds the signal back to the chaos mapping control element 15 through the speed input element 16. The chaos mapping control element 15 generates an input voltage for controlling the motor 8 to generate a chaotic rotational speed. The input voltage is transmitted to the motor 8 through the speed output element 17, causing the motor 8 to produce a chaotic rotation effect and driving the stirring paddle 6 to rotate at a chaotic rotational speed to perform flocculation stirring on the sewage. Through the closed-loop control of the speed input element 16, the chaos mapping control element 15, and the speed output element 17, the chaotic rotational speed range of the motor can be made more precise, the effective action range of the paddle is wide, and the stirring and mixing effect is strong.

[0050] For a further optimized solution, the post-treatment unit includes a thickener 11, a clarifier 13, and a neutralization tank 14. The water inlet of the thickener 11 is connected to the water outlet of the stirring and flocculation tank 5. The upper part of the thickener 11 is connected to the clarifier 13 through a pipeline. The bottom of the thickener 11 is connected to the neutralization tank 14 through a sludge pump 12. The clarifier 13 is used to obtain the final upper clarified liquid, and the neutralization tank 14 is used to perform acid-base neutralization treatment on the treated sewage.

[0051] The thickener 11 is a solid-liquid separation device that utilizes gravitational sedimentation. After the sewage in the stirring and flocculation tank 5 flows into the thickener 11, it is used to achieve the solid-liquid separation of the sewage in the thickener 11.

[0052] The clarifier 13 is a device for removing suspended solids and colloids in water. When the upper-layer liquid in the thickener 11 flows into the clarifier through a pipeline, by removing the suspended solids and alternates in the water, the solid-liquid separation of colloids, flocculent particles and water in the clarifier 13 is achieved, and finally the upper-layer clarified liquid is obtained.

[0053] The sludge pump 12 is a transport machine for transporting high-viscosity fluids. It is used to transport the sludge at the bottom of the thickener 11 to the neutralization tank 14, so that the metal element pollutants are separated from the liquid, facilitating the upper-layer liquid in the thickener 11 to flow into the clarifier 13.

[0054] The neutralization tank 14 is a mechanical device for neutralizing wastewater. An acidic solution tank and an alkaline neutralization tank are provided in the neutralization tank. The pH meter sensor is used to monitor the acidity and alkalinity of the liquid in the tank, and the acid-base neutralization treatment of the sewage is achieved.

[0055] The working process of this embodiment is as follows: The sewage in the intermediate water tank 1 enters the electrochemical system 3 through the parallel electrochemical pump 2. In the electrochemical system 3, the metal ions in the cadmium-containing sewage are removed, and the cadmium metal content in the water is monitored. The sewage treated by the electrochemical system 3 undergoes aeration treatment in the aeration tank 4 to increase the oxygen content, and then enters the stirring and flocculation tank 5. By adding a flocculant in the stirring and flocculation tank 5, and controlling the motor 8 to rotate at a chaotic speed through the chaotic control circuit 7, the motor 8 drives the stirring paddle 6 through the stirring shaft 9 to stir the sewage in the stirring and flocculation tank 5. Then, the sewage with a large amount of flocs enters the thickener 11 through a pipeline. In the thickener 11, the flocculated solid sludge sinks to the bottom of the thickener 11 by gravitational sedimentation. Then, the sludge at the bottom of the thickener 11 is pumped to the neutralization tank 14 by the sludge pump 12 for sewage neutralization. The upper-layer liquid at the top of the thickener 11 flows into the clarifier 13 through a pipeline. By adding a separation agent to the clarifier 13, the suspended solids and flocculent particles in the water are separated from the water, and finally the upper-layer clarified liquid is obtained.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. Cadmium waste residue recovery system based on chaotic variable-speed stirring technology, characterized in that, Comprising: Intermediate water tank (1); Electrochemical treatment unit, the water outlet of the intermediate water tank (1) is communicated with the water inlet of the electrochemical treatment unit, and the electrochemical treatment unit performs electrochemical treatment on sewage through electrochemical treatment technology; Chaotic stirring and flocculation unit, the water inlet of the chaotic stirring and flocculation unit is connected to the water outlet of the electrochemical treatment unit, and the chaotic stirring and flocculation unit is used for flocculation treatment of sewage containing impurity ions; Post-treatment unit, the water inlet of the post-treatment unit is communicated with the water outlet of the chaotic stirring and flocculation unit, and the post-treatment unit is used for separating the flocculated sewage and neutralizing the sludge to finally obtain clarified liquid; The chaotic stirring and flocculation unit includes an aeration tank (4) and a stirring and flocculation tank (5), the water inlet of the aeration tank (4) is communicated with the water outlet of the electrochemical treatment unit, the water outlet of the aeration tank (4) is communicated with the water inlet of the stirring and flocculation tank (5), a chaotic stirring part is arranged in the stirring and flocculation tank (5), and the chaotic stirring part stirs the sewage at a chaotic rotation speed to form large flocs in the sewage, and the water outlet of the stirring and flocculation tank (5) is communicated with the post-treatment unit; The chaotic stirring part includes a motor (8), a rotation speed sensor (10) and a chaotic control circuit (7), the motor (8) is vertically arranged at the center of the top of the stirring and flocculation tank (5), one end of a stirring shaft (9) is fixedly connected coaxially with the output shaft of the motor (8), the other end of the stirring shaft (9) is fixedly connected with a stirring paddle (6), the stirring paddle (6) is immersed in the stirring and flocculation tank (5), the rotation speed sensor (10) is arranged corresponding to the stirring shaft (9), the rotation speed sensor (10) is used for monitoring the rotation speed of the stirring shaft (9), and the motor (8) and the rotation speed sensor (10) are respectively electrically connected to the chaotic control circuit (7).

2. The cadmium waste residue recovery system based on the chaotic variable-speed stirring technology according to claim 1, characterized in that: The electrochemical treatment unit includes a parallel electrochemical pump (2) and an electrochemical system (3), the water outlet of the intermediate water tank (1) is communicated with the water inlet of the electrochemical system (3) through the parallel electrochemical pump (2), the electrochemical system (3) is used for removing metal ions in the sewage and monitoring the content of cadmium metal in the sewage, and the water outlet of the electrochemical system (3) is communicated with the water inlet of the chaotic stirring and flocculation unit.

3. The cadmium waste residue recovery system based on the chaotic variable-speed stirring technology according to claim 1, wherein: The stirring paddle (6) includes two groups of radial blades (18) and four groups of axial blades (19), the two groups of radial blades (18) are fixedly connected to the end of the stirring shaft (9) far from the motor (8) in sequence from top to bottom, the four groups of axial blades (19) are respectively vertically fixedly connected between the two groups of radial blades (18), and the four groups of axial blades (19) are evenly distributed on the radial blades (18).

4. The cadmium waste residue recovery system based on the chaotic variable-speed stirring technology according to claim 1, wherein: The chaos control circuit (7) includes a chaos mapping control element (15), a speed input element (16) and a speed output element (17). The speed input element (16) is electrically connected to the rotational speed sensor (10), the speed output element (17) is electrically connected to the motor (8), and the chaos mapping control element (15) is configured to analyze the value transmitted by the speed input element (16) and control the rotational speed of the motor (8) through the speed output element (17).

5. The cadmium waste residue recovery system based on the chaotic variable-speed stirring technology according to claim 1, characterized in that: The post-treatment unit includes a thickener (11), a clarifier (13) and a neutralization tank (14). The water inlet of the thickener (11) is communicated with the water outlet of the stirring and flocculation tank (5). The upper part of the thickener (11) is communicated with the clarifier (13) through a pipeline. The bottom of the thickener (11) is communicated with the neutralization tank (14) through a sludge pump (12). The clarifier (13) is used to obtain the final upper clarified liquid, and the neutralization tank (14) is used to perform acid-base neutralization treatment on the treated sewage.

6. The cadmium waste residue recovery system based on the chaotic variable-speed stirring technology according to claim 4, wherein: The chaotic rotational speed controlled by the chaotic mapping control element (15) has the expression In the formula, is the base speed, that is, the speed at which the motor (8) operates stably collected by the rotational speed sensor (10), is the speed boundary; is the chaos control term, that is, the chaos sequence generated by the chaos mapping.

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