Iron oxide preparation equipment based on venturi

Abstract

This application relates to an iron oxide preparation device based on a Venturi tube, comprising a reaction vessel, a Venturi tube, a circulating pump, an oxygen storage device, and a mixing cylinder. The reaction vessel contains a solid-liquid mixture and is equipped with a circulating gas outlet, a circulating liquid outlet, and a circulating liquid inlet. The mixing cylinder mixes air and oxygen before introducing it into the Venturi tube. The liquid reactant enters the Venturi tube via the circulating pump. After thorough mixing of gas and liquid in the Venturi tube, the mixture returns to the reaction vessel. A stainless steel heating tube provides a heating environment within the reaction vessel. The device also includes a filter tank, a fine-pore baffle, a liquid level sensor, a temperature sensor, and an oxygen content sensor. This application achieves the technical benefits of ensuring sufficient reaction between oxygen in the air and the solid-liquid mixture, producing iron oxide yellow, iron oxide red, and iron oxide black according to different proportions, improving the versatility of the device, increasing the efficiency of the circulating pump, extending its service life, ensuring the reaction proceeds at suitable temperature and oxygen content, and facilitating product discharge.

Description

Technical Field

[0001] This utility model relates to the field of iron oxide preparation technology, and in particular to an iron oxide preparation device based on a venturi tube. Background Technology

[0002] In the chemical production field, the preparation of iron oxide is a crucial step. Iron oxide has diverse applications, widely used in numerous industries such as coatings, ceramics, and electronics. With the continuous development of these industries, higher demands are being placed on the quality and quantity of iron oxide. High-quality iron oxide can improve product performance and quality, while stable production volume can meet market demand and drive the development of related industries. Therefore, continuously improving and optimizing iron oxide preparation technology is of great significance to the entire chemical industry and related downstream industries.

[0003] In traditional iron oxide preparation processes, a blower is typically used to ensure sufficient reaction between the solid-liquid mixture and oxygen. This method involves introducing air or oxygen into the reactor using a blower to increase the contact between the reactants and oxygen. Alternatively, a stirring device can be used to agitate the reactants, promoting oxygen dissolution and diffusion, thereby improving reaction efficiency. Some processes also employ intermittent aeration, introducing oxygen into the reactor at regular intervals.

[0004] However, traditional methods such as blower aeration have significant drawbacks. Blower aeration is energy-intensive and can easily cause uneven gas distribution during the aeration process, leading to insufficient contact between reactants and oxygen, thus affecting reaction efficiency and the quality of iron oxide preparation. While stirring devices can promote oxygen diffusion to some extent, their effect is limited for some highly viscous solid-liquid mixtures, making it difficult to ensure sufficient contact between reactants and oxygen. Intermittent aeration also cannot provide a continuous and stable supply of oxygen, which is detrimental to the continuous progress of the reaction. Utility Model Content

[0005] This invention solves the problems of high energy consumption and insufficient contact between reactants and oxygen in the blower-driven gas method, and proposes an iron oxide preparation device based on a venturi tube to fully consume the oxygen in the mixed gas.

[0006] To achieve the above objectives, the following technical solution is proposed: An iron oxide preparation device based on a Venturi tube includes a reaction vessel, a Venturi tube, a circulating pump, an oxygen storage device, and a mixing cylinder. The bottom of the reaction vessel is conical, and a discharge port is located at the lowest point of the bottom of the reaction vessel. A discharge valve is provided on the discharge port. The reaction vessel contains a solid-liquid mixture for preparing iron oxide. A circulating gas outlet is located above the liquid surface of the solid-liquid mixture in the reaction vessel, and a circulating liquid outlet is located below the liquid surface of the solid-liquid mixture in the reaction vessel. The bottom of the reaction vessel is... The circulating liquid inlet and the mixing cylinder are equipped with an air inlet connected to the circulating air outlet via a gas pipe, an oxygen inlet connected to the air outlet of an oxygen storage device via a gas pipe, and a mixed gas outlet connected to the air inlet of a Venturi tube via a gas pipe. The liquid inlet of the Venturi tube is connected to the liquid outlet of the circulating pump, the liquid inlet of the circulating pump is connected to the circulating liquid outlet, the gas-liquid outlet of the Venturi tube is connected to the circulating liquid inlet, a filter tank is provided between the circulating liquid outlet and the liquid inlet of the circulating pump, and a stainless steel heating tube is provided inside the reaction vessel.

[0007] The air inside the reactor sequentially passes through the circulating outlet, the air inlet of the mixing cylinder, the mixed gas outlet of the mixing cylinder, the air inlet of the Venturi tube, and the gas-liquid outlet of the Venturi tube before returning to the reactor to form a circulating gas channel. Through continuous circulation, the oxygen in the air reacts fully with the solid-liquid mixture. In addition, to prevent the oxygen in the air from being depleted, the mixing cylinder is equipped with an oxygen inlet for replenishing oxygen. The oxygen inlet is connected to the outlet of the oxygen storage device, so that oxygen is introduced into the mixing cylinder to mix with the air. The liquid reactants in the solid-liquid mixture sequentially pass through the circulating liquid outlet, the liquid inlet of the circulating pump, the liquid outlet of the circulating pump, the liquid inlet of the Venturi tube, the gas-liquid outlet of the Venturi tube, and the circulating liquid inlet before returning to the reactor to form a liquid circulation channel. Stainless steel heating tubes provide the heating environment for iron oxide preparation. The mixed gas enters the throat of the Venturi tube through the inlet. Driven by a circulating pump, the gas flows from the throat to the gas-liquid outlet of the Venturi tube, and further enters the reactor from the bottom through the liquid inlet. The Venturi tube ensures thorough gas-liquid mixing, and the mixed gas moves upwards, fully consuming the oxygen in the mixture. This invention can produce iron oxide yellow, iron oxide red, and iron oxide black according to different ratios of solid-liquid reactants, improving the versatility of the apparatus.

[0008] Preferably, the circulating outlet is provided with a circulating inlet pipe that extends into the interior of the filter tank. The outlet of the circulating inlet pipe is located at 1 / 3 to 1 / 2 of the height inside the filter tank. The filter tank is connected to the inlet of the circulating pump through the circulating outlet pipe, and the inlet of the circulating outlet pipe is located at 1 / 3 of the height inside the filter tank to the liquid surface.

[0009] Preferably, the reactor is provided with a perforated baffle for placing solid reactants, and the perforated baffle has a number of through holes with an inner diameter smaller than the minimum diameter of the solid reactants.

[0010] Preferably, a liquid level sensor is provided above the circulation outlet to detect the liquid level of the liquid reactants.

[0011] Preferably, a temperature sensor is provided in the middle of the reactor to detect the degree of reaction.

[0012] Preferably, the mixing cylinder is equipped with an oxygen content sensor to detect the oxygen content inside the mixing cylinder, the outlet of the oxygen storage device is equipped with an oxygen valve to regulate the oxygen flow rate of the oxygen storage device, and the connecting pipe between the mixing cylinder outlet and the venturi tube inlet is equipped with a gas flow meter to detect the input flow rate of the mixed gas.

[0013] Preferably, the circulating inlet is located above the outlet, and the circulating inlet is equipped with an inlet valve.

[0014] The beneficial effects of this invention are as follows: This device uses a Venturi tube instead of the traditional blower method, reducing energy consumption. The special structure of the Venturi tube allows for thorough mixing of gas and liquid, solving the problem of uneven gas distribution in traditional blower methods, and increasing the contact opportunities between reactants and oxygen, thereby improving reaction efficiency and the quality of iron oxide preparation. The circulation system ensures continuous reaction, and the stainless steel heating tube provides a suitable reaction temperature, making the entire preparation process more stable and efficient, representing a significant improvement and enhancement compared to traditional iron oxide preparation technologies. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of the device of this utility model.

[0016] The components include: 1. Reactor; 2. Venturi tube; 3. Circulating pump; 4. Oxygen storage device; 5. Filter tank; 6. Mixing cylinder; 7. Fine-pore baffle; 8. Stainless steel heating tube; 9. Liquid level sensor; 10. Temperature sensor; 11. Oxygen content sensor; 12. Oxygen valve; 13. Breathing valve; 14. Circulating liquid outlet; 15. Circulating gas outlet; 16. Discharge port; 17. Discharge valve; 18. Circulating liquid inlet; 19. Liquid inlet valve; 20. Gas flow meter. Detailed Implementation

[0017] Example: This embodiment proposes an iron oxide preparation device based on a Venturi tube, referring to... Figure 1The reactor comprises a reaction vessel 1, a venturi tube 2, a circulating pump 3, an oxygen storage device 4, and a mixing cylinder 6. The reaction vessel 1 contains a solid-liquid mixture for preparing iron oxide. The reaction vessel 1 has a circulating air outlet 15 above the liquid surface of the solid-liquid mixture and a circulating liquid outlet 14 below the liquid surface of the solid-liquid mixture. The bottom of the reaction vessel 1 has a circulating liquid inlet 18. The mixing cylinder 6 has an air inlet connected to the circulating air outlet 15 via a gas pipe, an oxygen inlet connected to the outlet of the oxygen storage device 4 via a gas pipe, and a mixed gas outlet connected to the inlet of the venturi tube 2 via a gas pipe. The liquid inlet of the venturi tube 2 is connected to the liquid outlet of the circulating pump 3, the liquid inlet of the circulating pump 3 is connected to the circulating liquid outlet 14, and the gas-liquid outlet of the venturi tube 2 is connected to the circulating liquid inlet 18. The reaction vessel 1 is equipped with a stainless steel heating tube 8.

[0018] The air inside the reactor 1 passes sequentially through the circulating outlet 15, the air inlet of the mixing cylinder 6, the mixed gas outlet of the mixing cylinder 6, the inlet of the venturi tube 2, and the gas-liquid outlet of the venturi tube 2 before returning to the reactor 1 to form a circulating air channel. Through continuous circulation, the oxygen in the air reacts fully with the solid-liquid mixture. In addition, to prevent the oxygen in the air from being consumed, the mixing cylinder 6 is provided with an oxygen inlet for replenishing oxygen. The oxygen inlet is connected to the outlet of the oxygen storage device 4, so that oxygen is input into the mixing cylinder 6 to mix with the air. The liquid reactants in the solid-liquid mixture pass sequentially through the circulating liquid outlet 14, the liquid inlet of the circulating pump 3, the liquid outlet of the circulating pump 3, the liquid inlet of the venturi tube 2, the gas-liquid outlet of the venturi tube 2, and the circulating liquid inlet 18 before returning to the reactor 1 to form a liquid circulation channel. The stainless steel heating tube 8 provides a heating environment for the preparation of iron oxide. The mixed gas enters the throat of the Venturi tube 2 through the inlet. Under the action of the circulating pump 3, the gas flows from the throat to the gas-liquid outlet of the Venturi tube 2, and further enters the interior of the reactor 1 from the bottom through the circulating liquid inlet 18. The Venturi tube 2 ensures thorough mixing of gas and liquid, and the mixed gas moves from bottom to top, fully consuming the oxygen in the mixed gas. This invention can produce iron oxide yellow, iron oxide red, and iron oxide black according to different ratios of solid-liquid mixed reactants, improving the versatility of the device.

[0019] A filter tank 5 is provided between the circulation outlet 14 and the inlet of the circulation pump 3. The circulation outlet 14 is provided with a circulation inlet pipe that extends into the interior of the filter tank 5. The outlet of the circulation inlet pipe is located at 1 / 3 to 1 / 2 of the height inside the filter tank 5. The filter tank 5 is connected to the inlet of the circulation pump 3 through the circulation outlet pipe. The inlet of the circulation outlet pipe is located at 1 / 3 of the height inside the filter tank 5 to the liquid surface.

[0020] Because the Venturi tube 2 is used to spray the gas-liquid mixture upwards at high speed from the bottom of the reactor 1, some solid reactants will rise to the upper reaction liquid and be drawn out by the circulating pump 3. In order to prevent solid reactants from entering the circulating pump 3 and affecting its service life, the present invention provides a filter tank 5 between the circulating liquid outlet 14 and the liquid inlet of the circulating pump 3. After the mixed gas and liquid-solid reactants drawn out by the circulating pump 3 from the reactor 1 enter the filter tank 5, the mixed gas moves upward under the action of gas pressure and the solid reactants settle downwards under the action of gravity. At this time, the pure liquid located between the liquid surface and the solid is drawn out by the circulating pump 3 from the circulating liquid outlet pipe, which improves the efficiency of the circulating pump 3 and extends its service life.

[0021] The reactor 1 is provided with a perforated partition 7 for placing solid reactants. The perforated partition 7 has several through holes with an inner diameter smaller than the minimum diameter of the solid reactants.

[0022] The purpose of this invention is to provide a perforated baffle 7 to prevent solid reactants from depositing at the bottom of the reactor 1, which would result in insufficient contact with the mixed gas. With the perforated baffle 7 in place, the mixed gas can pass through the various holes in the baffle 7 and fully contact the solid reactants.

[0023] A liquid level sensor 9 is installed above the circulation outlet 14 to detect the liquid reactant level. When the liquid reactant level in the reactor 1 is lower than the circulation outlet 14, the circulation pump 3 is turned off to prompt the addition of liquid reactant.

[0024] A temperature sensor 10 is installed in the middle of the reactor 1 to detect the degree of reaction. When the temperature sensor 10 detects that the temperature is lower than the set reaction temperature, the stainless steel heating tube 8 is activated to heat the solid-liquid reactants. When the temperature sensor 10 detects that the temperature is higher than the set reaction temperature, the heating of the stainless steel heating tube 8 is stopped, so that the temperature inside the reactor 1 is maintained at a suitable temperature for the formation of iron oxide.

[0025] The mixing cylinder 6 is equipped with an oxygen content sensor 11 for detecting the oxygen content inside the mixing cylinder 6. The outlet of the oxygen storage device 4 is equipped with an oxygen valve 12 for adjusting the oxygen flow rate of the oxygen storage device 4. A gas flow meter 20 is installed on the connecting pipe between the gas outlet of the mixing cylinder 6 and the inlet of the venturi tube 2 for detecting the input flow rate of the mixed gas.

[0026] When the oxygen content sensor 11 detects that the oxygen content in the mixing cylinder 6 is lower than the set value, the oxygen valve 12 is opened; when the oxygen content sensor 11 detects that the oxygen content in the mixing cylinder 6 is higher than the set value, the oxygen valve 12 is closed, or the opening degree of the oxygen valve 12 is set according to the oxygen content gradient.

[0027] The bottom of the reactor 1 is provided with an inverted cone shape, and the lowest end of the bottom of the reactor 1 is provided with a discharge port 16. The discharge port 16 is provided with a discharge valve 17. The circulating liquid inlet 18 is located above the discharge port 16, and the circulating liquid inlet 18 is provided with a liquid inlet valve 19.

[0028] During the iron oxide preparation reaction, the discharge valve 17 is closed. When the reaction is complete, the circulation pump 3 stops working, the liquid inlet valve 19 is closed, and then the discharge valve 17 is opened. At this time, the product after the reaction can flow out from the discharge port.

[0029] When used to prepare iron oxide yellow, the solid-liquid mixture comprises iron sheet placed on a perforated partition 7 and a ferrous sulfate solution that completely soaks the iron sheet.

[0030] When preparing ferric oxide yellow, the stainless steel heating tube 8 is needed to raise the reaction temperature to 80 to 90 degrees Celsius. The ferrous sulfate solution is above air with an oxygen content of less than 21%. Since the oxygen in the air oxidizes the ferric ions, the consumed oxygen needs to be continuously replenished from the oxygen storage device.

[0031] When used to prepare iron oxide red, the solid-liquid mixture comprises iron sheet placed on a perforated partition 7 and a mixed solution of ferrous sulfate and ferric nitrate that completely soaks the iron sheet.

[0032] When preparing iron oxide red, the stainless steel heating tube 8 is needed to raise the reaction temperature to 80 to 90 degrees Celsius. The mixed solution of ferrous sulfate and ferric nitrate is above air with an oxygen content of less than 21%. Since the oxygen in the air oxidizes the iron ions, the consumed oxygen needs to be continuously replenished from the oxygen storage device.

[0033] When used to prepare iron oxide black, the solid-liquid mixture comprises iron hydroxide placed on a fine-pore partition 7 and a calcium hydroxide solution or sodium hydroxide solution completely immersed in the iron hydroxide.

[0034] When preparing iron oxide black, the calcium hydroxide solution or sodium hydroxide solution is placed on top of air with an oxygen content of less than 21%. Since the oxygen in the air needs to oxidize iron ions, the consumed oxygen needs to be continuously replenished from the oxygen storage device.

[0035] This device replaces the traditional blower aeration method with a Venturi tube, reducing energy consumption. The special structure of the Venturi tube allows for thorough gas-liquid mixing, solving the problem of uneven gas distribution caused by traditional blower aeration, and increasing the contact opportunities between reactants and oxygen, thereby improving reaction efficiency and the quality of iron oxide preparation. The circulation system ensures continuous reaction, and the stainless steel heating tube provides a suitable reaction temperature, making the entire preparation process more stable and efficient, representing a significant improvement over traditional iron oxide preparation technologies.

Claims

1. An iron oxide preparation device based on a venturi tube, characterized in that, The reactor includes a reactor (1), a venturi tube (2), a circulating pump (3), an oxygen storage device (4), and a mixing cylinder (6). The bottom of the reactor (1) is conical, and the lowest point of the bottom of the reactor (1) is provided with a discharge port (16). The discharge port (16) is provided with a discharge valve (17). The reactor (1) contains a solid-liquid mixture for preparing iron oxide. The reactor (1) is provided with a circulating gas outlet (15) above the liquid surface of the solid-liquid mixture, and a circulating liquid outlet (14) below the liquid surface of the solid-liquid mixture. The bottom of the reactor (1) is provided with a circulating liquid inlet (18). The mixing cylinder (6) is provided with an air inlet connected to the circulating air outlet (15) via a gas pipe, an oxygen inlet connected to the outlet of the oxygen storage device (4) via a gas pipe, and a mixed gas outlet connected to the inlet of the venturi tube (2) via a gas pipe. The liquid inlet of the venturi tube (2) is connected to the liquid outlet of the circulating pump (3). The liquid inlet of the circulating pump (3) is connected to the circulating liquid outlet (14). The gas-liquid outlet of the venturi tube (2) is connected to the circulating liquid inlet (18). A filter tank (5) is provided between the circulating liquid outlet (14) and the liquid inlet of the circulating pump (3). A stainless steel heating tube (8) is provided inside the reaction vessel (1).

2. The iron oxide preparation device based on a Venturi tube according to claim 1, characterized in that, The circulating outlet (14) is provided with a circulating inlet pipe that extends into the filter tank (5). The outlet of the circulating inlet pipe is located at 1 / 3-1 / 2 of the height inside the filter tank (5). The filter tank (5) is connected to the inlet of the circulating pump (3) through the circulating outlet pipe. The inlet of the circulating outlet pipe is located at 1 / 3 of the height inside the filter tank (5) to the liquid surface.

3. The iron oxide preparation device based on a Venturi tube according to claim 1, characterized in that, The reactor (1) is provided with a perforated partition (7) for placing solid reactants. The perforated partition (7) has several through holes with an inner diameter smaller than the minimum diameter of the solid reactants.

4. The iron oxide preparation apparatus based on a Venturi tube according to claim 1, characterized in that, A liquid level sensor (9) is provided above the circulating outlet (14) to detect the liquid level of the liquid reactants.

5. The iron oxide preparation apparatus based on a Venturi tube according to claim 1, characterized in that, The reactor (1) is equipped with a temperature sensor (10) in the middle to detect the degree of reaction.

6. The iron oxide preparation apparatus based on a Venturi tube according to claim 1, characterized in that, The mixing cylinder (6) is equipped with an oxygen content sensor (11) to detect the oxygen content in the mixing cylinder (6). The outlet of the oxygen storage device (4) is equipped with an oxygen valve (12) to regulate the oxygen flow rate of the oxygen storage device (4). The gas flow meter (20) is installed on the connecting pipe between the gas outlet of the mixing cylinder (6) and the inlet of the venturi tube (2) to detect the input flow rate of the mixed gas.

7. The iron oxide preparation apparatus based on a Venturi tube according to claim 1, characterized in that, The circulating inlet (18) is located above the outlet (16), and the circulating inlet (18) is equipped with an inlet valve (19).

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