A zinc powder waste residue recycling device

Abstract

The device is mainly used for zinc powder waste slag recycling treatment device of thermal zinc spraying, establishes an integrated waste slag treatment system, adopts high-efficiency electromagnetic induction heating technology, precise temperature control mechanism, combination design of rotary valve airlock and high-precision filter screen, breaks through the defects of low separation efficiency and gas leakage of traditional separation equipment, realizes gas-solid separation, introduces a high-temperature high-pressure reaction kettle for carbon dioxide green conversion process, and cooperatively realizes the recycling of zinc resources (recycled zinc can be directly used for thermal zinc spraying) and the environmental protection treatment of carbon dioxide (urea is generated), greatly improves the economy and sustainability.

Description

Technical Field

[0001] This utility model relates to the field of thermal spraying zinc technology, specifically to a device for recycling zinc powder and zinc oxide remaining after thermal spraying zinc in industrial production. Background Technology

[0002] Thermal spraying zinc technology, as a highly efficient metal surface corrosion protection process, occupies an important position in the industrial field. Its core principle is to melt zinc wire using a high-temperature heat source, atomize the molten zinc into microparticles with compressed air, and spray them at high speed onto a pre-treated substrate surface to form a uniform and dense zinc coating. During the thermal spraying zinc operation, due to energy loss and diffusion during the atomization and spraying of zinc powder, some zinc powder waste residue is always generated that does not effectively adhere to the substrate surface. This waste residue contains a large amount of zinc; direct disposal would result in a serious waste of zinc resources and, due to zinc's heavy metal properties, would pollute soil, water bodies, and other environmental elements, contradicting the current development concepts of green environmental protection and resource recycling. The zinc powder waste residue mainly consists of zinc and zinc oxide. Zinc oxide can be reduced by reacting with carbon monoxide at 500-800℃, and carbon dioxide can react with ammonia under high temperature and pressure to form urea, which plays a crucial role in industry, environmental protection, and medicine. Therefore, the recycling and treatment of zinc powder waste residue from thermal spraying zinc has significant practical significance and economic value. Summary of the Invention

[0003] The purpose of this invention is to recycle and reuse the waste residue after thermal zinc spraying, and to treat the carbon dioxide generated by the reaction in an environmentally friendly and green manner.

[0004] The technical solution of this utility model is: a zinc powder waste recycling and treatment device, mainly comprising: a blower, a main pipeline, a conveying pipeline, an electromagnetic coil, a temperature control cabinet, a control valve, gas cylinder I, an explosion-proof plate, a filter screen, a rotary valve air lock, a zinc powder collection tank, a feed inlet, gas cylinder II, a high-temperature and high-pressure reactor, a discharge outlet, and a urea collection tank. Its features are: the blower is connected to the main pipeline; a conveying pipeline is opened at the upper end of the main pipeline; two sets of electromagnetic coils are wound around the main pipeline and connected to the temperature control cabinet; gas cylinder I is connected to the main pipeline and is equipped with a control valve and an explosion-proof plate; a filter screen is installed on the cylinder wall of the main pipeline; a rotary valve air lock is installed at the lower end of the main pipeline, and the zinc powder collection tank is connected to the main pipeline; the feed inlet of the high-temperature and high-pressure reactor is connected to the main pipeline; gas cylinder II is connected to the high-temperature and high-pressure reactor and is equipped with a control valve and an explosion-proof plate; the urea collection tank is connected to the discharge outlet of the high-temperature and high-pressure reactor.

[0005] The blower (four-stroke-YMH0926) generates a continuous and stable air pressure difference, forming a directional airflow in the pipeline, which enables the zinc powder waste to overcome the friction of the inner wall of the pipeline and the weight of the waste itself, allowing the waste to move along the pipeline path.

[0006] The high-temperature and high-pressure reactor (GSH-1000L) provides the environment required for the reaction of ammonia and carbon dioxide. The reaction needs to be carried out under high temperature (about 180-200℃) and high pressure (about 15-25MPa) conditions to allow carbon dioxide and ammonia to react fully to form urea. Urea is used in agricultural production and can also be used in the pharmaceutical, plastics and other industrial fields, which can reduce carbon dioxide emissions to a certain extent.

[0007] The aforementioned electromagnetic coil, by winding an electromagnetic coil around the outside of the pipe, rectifies 220V or 380V AC power into DC power, filters the DC power, and then uses a thyristor to convert the DC power back into AC power. This generates high-frequency magnetic lines of force within the induction coil, inducing eddy currents on the surface of the metal pipe, thus heating the pipe from within. Alternatively, by directly winding the electromagnetic coil around the pipe, efficient and uniform heating is achieved through the principle of electromagnetic induction.

[0008] The temperature control cabinet (220V 10kW) has a built-in temperature sensor that monitors the temperature inside the heating pipe of the electromagnetic coil in real time and feeds the temperature signal back to the control system. The control system adjusts the output power according to the difference between the set temperature and the actual monitored temperature, using the switching characteristics of the thyristor, so that the temperature inside the pipe is controlled between 500-800℃, ensuring that zinc oxide and carbon monoxide react completely.

[0009] The control valve is used to open or close the gas output from the gas cylinder. When closed, it completely blocks gas flow, ensuring the cylinder's seal when not in use and preventing gas leakage; when open, it allows gas to flow out as needed to supply gas to subsequent equipment.

[0010] The gas cylinder I contains standard carbon monoxide gas.

[0011] The gas cylinder II contains ammonia standard gas.

[0012] The aforementioned explosion-proof plate, in high-purity carbon monoxide gas pipelines, may leak even a small amount, leading to air pollution or safety risks. The explosion-proof plate can achieve complete sealing through a tight metal sealing structure, preventing the pipeline from exploding or rupturing due to abnormal increase in internal pressure.

[0013] The filter screen intercepts zinc powder but allows carbon dioxide to pass through.

[0014] The rotary valve airlock controls the entry of zinc powder and blocks carbon dioxide, preventing the transported gas from flowing out.

[0015] Preferably, the blower (four-stroke - YMH0926) cylinder is made of aluminum alloy. The internal combustion engine crankshaft of the blower drives the blower impeller to rotate at high speed through belts and gears. When the impeller rotates, the blades push the air or gas, so that the airflow gains kinetic energy and is output in a directional manner through the pipeline.

[0016] Preferably, the main pipeline is made of a composite material of carbon steel and 310 stainless steel, which has excellent resistance to oxidation and acid and alkali corrosion (especially oxidizing media at high temperatures), and can resist the erosion of high-temperature flue gas, acidic solutions, molten metal and other substances in industrial environments.

[0017] Preferably, the filter screen is made of stainless steel with a 500-mesh wire mesh, capable of withstanding temperatures of several hundred degrees Celsius and intercepting zinc powder. The size of the filter screen can be customized according to the inner diameter of the pipe, suitable for industrial-grade zinc powder filtration.

[0018] Preferably, the high-temperature and high-pressure reactor (GSH-1000L) is made of stainless steel and carbon steel composite plate, capable of carrying out chemical reactions under high temperature and high pressure. It mainly consists of a motor reducer, magnetic coupler, reactor, and pressure gauge, and uses oil bath electric heating to control the temperature inside the reactor.

[0019] Preferably, the temperature control cabinet (220V 10kW) features a high-precision PID controller, a large-capacity solid-state relay, a built-in overcurrent protector, built-in heat sinks for core components, derating design for circuit components, and openings on both sides of the cabinet for effective heat dissipation, ensuring system stability.

[0020] Compared with the prior art, this utility model has the following advantages: through the waste residue recycling and reuse device after thermal zinc spraying, the zinc oxide in the waste residue can be converted into metallic zinc through a reduction process with a purity of over 99%, and can be reused in thermal zinc spraying or other industrial fields. The carbon dioxide generated by reducing zinc oxide can be synthesized into urea with ammonia under high temperature and pressure, which can be widely used in agricultural fertilizers, industrial raw materials and environmental protection fields.

[0021] This device is mainly used for the recycling and treatment of zinc powder waste residue from thermal zinc spraying. It establishes an integrated waste residue treatment system, adopts efficient electromagnetic induction heating technology, precise temperature control mechanism, and a combination design of rotary valve air lock and high-precision filter screen. It overcomes the defects of low separation efficiency and gas leakage in traditional separation equipment, realizes gas-solid separation, and introduces a high-temperature and high-pressure reactor for green carbon dioxide conversion process. It synergistically realizes the recycling of zinc resources (recovered zinc can be directly used for thermal zinc spraying) and the environmentally friendly treatment of carbon dioxide (generating urea), which greatly improves economic efficiency and sustainability. Attached Figure Description

[0022] Figure 1 This is a simplified structural diagram of the zinc powder waste recycling and processing device of this utility model; Figure 1In the middle: 1. Blower, 2. Main pipeline, 3. Material conveying pipeline, 4. Electromagnetic coil, 5. Temperature control cabinet, 6. Control valve, 7. Gas cylinder I, 8. Explosion-proof plate, 9. Filter screen, 10. Rotary valve air lock, 11. Zinc powder collection tank, 12. Feed inlet, 13. Gas cylinder II, 14. High temperature and high pressure reactor, 15. Discharge outlet, 16. Urea collection tank. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] (The blower (four-stroke-YMH0926), high-temperature and high-pressure reactor (GSH-1000L), and temperature control cabinet (220V 10kW) mentioned above can all be obtained from the market or private orders.)

[0025] The blower is connected to the main pipeline; a material conveying pipe is opened at the upper end of the main pipeline; two sets of electromagnetic coils are wound on the main pipeline and connected to the temperature control cabinet; gas cylinder I is connected to the main pipeline and is equipped with a control valve and an explosion-proof plate; a filter screen is installed on the cylinder wall of the main pipeline; a rotary valve air lock is installed at the lower end of the main pipeline, and the zinc powder collection tank is connected to the main pipeline; the feed inlet of the high-temperature and high-pressure reactor is connected to the main pipeline; gas cylinder II is connected to the high-temperature and high-pressure reactor and is equipped with a control valve and an explosion-proof plate; the urea collection tank is connected to the discharge outlet of the high-temperature and high-pressure reactor.

[0026] Zinc powder waste is poured into the conveying pipeline and then into the main pipeline. Carbon monoxide from gas cylinder I is introduced into the main pipeline via a control valve. A blower generates a directional airflow, propelling the waste within the main pipeline. Explosion-proof diaphragms ensure safe gas delivery. An electromagnetic coil wound around the main pipeline, under the control of a temperature control unit, heats the pipeline itself through electromagnetic induction, precisely maintaining an internal temperature of 500-800℃. Under these conditions, zinc oxide and carbon monoxide in the waste react fully to produce zinc powder and carbon dioxide (reaction formula: ZnO + CO → Zn + CO2). The resulting mixture continues to move to the filter screen, where a 500-mesh stainless steel filter screen intercepts solid zinc powder. A rotary valve airlock, through a periodically closed channel, stably delivers the zinc powder to the zinc powder collection tank, achieving zinc recovery. The generated carbon dioxide passes through the filter screen and enters the high-temperature, high-pressure reactor through the feed inlet. Ammonia gas in cylinder II is introduced into the reactor through a control valve. Under high temperature and high pressure conditions of 180-200℃ and 15-25MPa, carbon dioxide reacts with ammonia gas to produce urea (reaction formula: CO2+2NH3→CO(NH2)2+H2O). The generated urea is collected in the urea collection tank through the discharge port, completing the synergistic process of resource recycling and environmental protection.

[0027] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A zinc powder waste residue recycling and treatment device, mainly comprising: The components are: blower (1), main pipe (2), conveying pipe (3), electromagnetic coil (4), temperature control cabinet (5), control valve (6), gas cylinder I (7), explosion-proof sheet (8), filter screen (9), rotary valve air lock (10), zinc powder collection tank (11), feed inlet (12), gas cylinder II (13), high temperature and high pressure reactor (14), discharge port (15), and urea collection tank (16). The blower (1) is connected to the main pipe (2); the upper end of the main pipe (2) is connected to the conveying pipe (3); two sets of electromagnetic coils (4) are wound around the main pipe (2) and connected to the temperature control cabinet. (5) Connected; Gas cylinder I (7) is connected to the main pipeline and a control valve (6) and an explosion-proof plate (8) are installed; a filter screen (9) is installed on the cylinder wall of the main pipeline (2); the lower end of the main pipeline (2) is opened and a rotary valve gas lock (10) is installed; the zinc powder collection tank (11) is connected to the main pipeline (2); the feed port (12) of the high temperature and high pressure reactor (14) is connected to the main pipeline (2); Gas cylinder II (13) is connected to the high temperature and high pressure reactor (14) and a control valve (6) and an explosion-proof plate (8) are installed; the urea collection tank (16) is connected to the discharge port (15) of the high temperature and high pressure reactor (14).

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