Device for improving the maturation degree of magnesium oxide agent and method for treating wastewater using magnesium oxide agent

Abstract

The application provides a device for improving the curing degree of magnesium oxide medicament and a method for treating wastewater by using the magnesium oxide medicament, and relates to the technical field of wastewater treatment in steel production. The device comprises a pre-curing container, which is used for mixing magnesium oxide powder with pre-curing water and performing a hydration reaction to generate pre-curing slurry; a medicament preparation container, which is used for receiving the pre-curing slurry and mixing the pre-curing slurry with preparation water to generate completely cured magnesium oxide medicament; a second liquid inlet pipeline, which is used for injecting the preparation water into the medicament preparation container; a negative pressure generating structure on the second liquid inlet pipeline is used for sucking the pre-curing slurry from the pre-curing container into the second liquid inlet pipeline through a communication pipeline, and then mixing the pre-curing slurry with the preparation water, so that the pre-curing slurry and the preparation water enter the medicament preparation container together; a disturbance mechanism is used for keeping the preparation water and the pre-curing slurry in a moving state; and a liquid outlet pipeline is in communication with the medicament preparation container and is used for outputting the completely cured magnesium oxide medicament. The application increases the hydration degree of the magnesium oxide and improves the purification efficiency of the magnesium oxide medicament on wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology in steel production, and particularly to an apparatus for improving the maturation degree of magnesium oxide reagent and a method for treating wastewater using magnesium oxide reagent. Background Technology

[0002] Zero-discharge technology for wastewater in steel enterprises is a comprehensive application technology for the complex treatment of wastewater from steel production. Zero discharge refers to the activity of infinitely reducing pollutant and energy emissions to zero. That is, industrial wastewater generated by various enterprises during the production process can be completely reused after appropriate technical treatment, and no wastewater will be discharged into the external water environment. Its purpose is to achieve zero wastewater discharge while making it a resource.

[0003] In recent years, the three-stage process of "dual-membrane method + salt concentration + evaporation crystallization" has become a commonly used technology in the field of zero-discharge wastewater treatment in the steel industry, demonstrating significant advantages in improving water resource utilization efficiency and reducing environmental risks. However, during this process, with the separation of treatment and cascade reuse, the salt content of the wastewater gradually increases, forming concentrated brine with a TDS (Total Dissolved Solids) value exceeding 2000 mg / L. This concentrated brine contains a high concentration of silica, which can clog nanofiltration membranes, increasing the frequency of chemical cleaning, shortening the service life, increasing membrane replacement frequency, and causing irreversible damage to the equipment. Simultaneously, the evaporator heat exchanger and falling film tubes are affected by silica scale, requiring high-pressure and chemical cleaning on average every six months, impacting the overall economic efficiency and stability of the process. How to effectively remove silica from the concentrated brine is one of the key factors restricting the development of zero-discharge wastewater technology.

[0004] Currently, wastewater silica removal processes can be categorized into four types: ion exchange, reverse osmosis, electrocoagulation, and chemical flocculation. Among these, chemical flocculation technology is the most widely used and mature. Magnesium oxide (MgO) is the most commonly used silica removal agent in chemical flocculation. Its silica removal mechanism can be summarized as follows: magnesium oxide particles hydrate in water to form complex colloidal particles of MgO and Mg(OH)2. Silicate compounds in the water undergo ion exchange with the Mg(OH)2 colloidal particles, forming insoluble magnesium silicate compounds, ultimately achieving silica removal. However, due to its unique high-temperature formation mechanism, magnesium oxide has a long hydration time and a relatively slow effect. When magnesium oxide hydrates in water, it first reacts with water to fill the lattice defects formed by high-temperature calcination. Then, the Mg(OH)2 stress generated on the particle surface causes the magnesium oxide particle surface to crack, exposing the MgO inside the particles, which continues to react with water, accelerating the hydration process of the MgO particle core. This reaction lasts for a considerable time; it is generally believed that larger particles disappear almost completely after 24 hours. However, when silicates are present in water, the reaction between MgO and silicates is an in-situ reaction. The resulting products gradually encapsulate the unexposed MgO core, preventing it from further reacting with the silicates in the solution. The hydration reaction then stops, and the magnesium oxide encapsulated by the reaction products cannot continue to react. Therefore, when using magnesium oxide as a silicate remover, it is crucial to perform pre-hydration to allow time for the magnesium oxide to react with silicates. This effectively solves the problem of low magnesium oxide utilization. Thus, the utilization efficiency and reaction effect of magnesium oxide directly affect the efficiency and technical and economic indicators of the entire silicate removal process system.

[0005] There are two main methods to improve the utilization efficiency of magnesium oxide in existing technologies. The first is to extend the hydration time of magnesium oxide, and the second is to improve the lattice and particle size of magnesium oxide. The first method, extending the hydration time, involves adding a magnesium oxide dosing tank, allowing two dosing devices to operate alternately. While one device is adding the reagent, the other mixes and stirs the magnesium oxide and water to extend the hydration reaction time, promote the hydration and breakup of magnesium oxide particles, and improve the utilization efficiency. After the dosing is complete, the system switches to dosing mode. However, adding a magnesium oxide dosing tank increases the floor space and equipment investment, and both devices need to be kept on standby or operating alternately, increasing operating costs. The second method, improving the lattice and particle size of magnesium oxide, involves controlling the reaction temperature for magnesium oxide formation. By using staged heating and temperature maintenance, the particle size and lattice defect formation of magnesium oxide are influenced, resulting in magnesium oxide with high reactivity and a suitable hydration particle size. However, since most magnesium oxide used in water treatment is a byproduct of industrial reactions, magnesium oxide with special properties needs to be customized, which increases the price of the reagents and the cost of water treatment.

[0006] In view of this, based on years of experience in production design in this and related fields, the applicant has designed a device for improving the curing degree of magnesium oxide reagent and a method for treating wastewater using magnesium oxide reagent through repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention

[0007] The purpose of this invention is to provide an apparatus for improving the hydration degree of magnesium oxide reagent and a method for treating wastewater using magnesium oxide reagent, thereby improving the purification efficiency of magnesium oxide reagent for wastewater by increasing the hydration degree of magnesium oxide.

[0008] To achieve the above objectives, the present invention proposes an apparatus for improving the aging degree of magnesium oxide reagent, wherein the apparatus for improving the aging degree of magnesium oxide reagent comprises: A pre-curing container is used to mix magnesium oxide powder with pre-curing water and carry out a hydration reaction to generate pre-curing slurry. A dispensing container is used to receive the pre-cooked slurry and mix it with dispensing water to generate a fully cooked magnesium oxide agent; The second liquid inlet pipe is used to inject the medicine preparation water into the medicine preparation container. The second liquid inlet pipe is equipped with a negative pressure generating structure, and the medicine preparation water generates negative pressure when it flows through the negative pressure generating structure. A connecting pipe connects the pre-curing container to the negative pressure generating structure. The negative pressure is used to draw the pre-curing slurry from the pre-curing container through the connecting pipe into the second liquid inlet pipe, where it is mixed with the medicine preparation water and then enters the medicine preparation container together. A disturbance mechanism is provided inside the drug preparation container to keep the drug preparation water and the pre-cooked slurry in motion; The liquid outlet pipe is connected to the drug preparation container and is used to output the fully matured magnesium oxide reagent.

[0009] This invention also proposes a method for treating wastewater using magnesium oxide, wherein the method includes: A predetermined amount of magnesium oxide powder is added to a pre-curing container, and pre-curing water is injected into the pre-curing container to a predetermined level while continuously stirring. Part of the magnesium oxide undergoes a hydration reaction and forms a pre-curing slurry. The pre-cured slurry is introduced from the pre-curing container into the dosing container, dosing water is injected into the dosing container and the pre-cured slurry and the dosing water are adjusted to a predetermined mixing ratio, so that the pre-cured slurry and the dosing water are in continuous contact until all the magnesium oxide has undergone a hydration reaction to form a fully cured magnesium oxide agent. The fully matured magnesium oxide agent is added to the production wastewater for chemical flocculation.

[0010] Compared with the prior art, the present invention has the following features and advantages: The present invention proposes an apparatus for improving the maturation degree of magnesium oxide reagent and a method for treating wastewater using magnesium oxide reagent. By using a pre-maturation step, the maturation degree of magnesium oxide reagent is improved, thereby increasing the utilization efficiency of magnesium oxide. Attached Figure Description

[0011] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0012] Figure 1 This is a schematic diagram of the wastewater treatment method using magnesium oxide reagent proposed in this invention; Figure 2 This is a schematic diagram of the device for improving the aging degree of magnesium oxide reagent proposed in this invention; Figure 3 This is a flowchart illustrating the use of magnesium oxide to treat wastewater in one embodiment of the present invention.

[0013] Explanation of reference numerals in the attached figures

[0014] 100. Apparatus for improving the maturation degree of magnesium oxide reagent; 1. First stirrer; 2. First liquid inlet pipe; 3. Exhaust port; 4. Screw conveying mechanism; 5. Precision weighing mechanism; 6. Overflow pipe; 7. Pre-maturation container; 8. Connecting pipe; 9. Automatic regulating valve; 10. Negative pressure generating structure; 11. Second liquid inlet pipe; 12. Dosing container; 13. Guide tube; 14. Foot plate; 15. Liquid outlet pipe; 16. Second stirrer. Detailed Implementation

[0015] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, and these should all be considered to fall within the scope of the invention.

[0016] This invention proposes a device 100 for improving the aging degree of magnesium oxide reagents, such as... Figure 2 As shown, the device for improving the aging degree of magnesium oxide reagent includes: Pre-curing container 7 is used to mix magnesium oxide powder with pre-curing water and carry out a hydration reaction to generate pre-curing slurry; The dispensing container 12 is used to receive the pre-cooked slurry and mix it with the dispensing water to generate a fully cooked magnesium oxide agent; The second liquid inlet pipe 11 is used to inject the medicine preparation water into the medicine preparation container 12. The second liquid inlet pipe 11 is equipped with a negative pressure generating structure 10. When the medicine preparation water flows through the negative pressure generating structure 10, negative pressure is generated. The connecting pipe 8 connects the pre-cooking container 7 and the negative pressure generating structure 10. The negative pressure is used to draw the pre-cooked slurry from the pre-cooking container 7 into the second liquid inlet pipe 11 through the connecting pipe 8 and mix it with the medicine preparation water before entering the medicine preparation container 12. A disturbance mechanism is installed inside the drug preparation container 12 to keep the drug preparation water and pre-cooked slurry in motion. The liquid outlet pipe 15 is connected to the drug preparation container 12 and is used to output the fully matured magnesium oxide reagent.

[0017] The device 100 proposed in this invention for improving the curing degree of magnesium oxide reagent has a pre-curing container 7 and a dispensing container 12. Magnesium oxide powder and pre-curing water are initially mixed in the pre-curing container 7 and undergo partial hydration reaction to generate a fluid pre-curing slurry, avoiding local overheating or uneven reaction caused by direct large-scale feeding. The pre-curing slurry and dispensing water are continuously moved in the dispensing container 12 by a disturbance mechanism, so that the remaining magnesium oxide particles can fully contact the water, and finally achieve complete hydration and conversion into magnesium hydroxide slurry (i.e., magnesium oxide reagent), which significantly improves the utilization rate of magnesium oxide and the activity of the reagent.

[0018] The device 100 proposed in this invention for improving the maturation degree of magnesium oxide preparation utilizes the negative pressure generated by the negative pressure generating structure 10 through the flow of the preparation water to automatically draw the pre-matured slurry into the second liquid inlet pipe 11. After being drawn in, the pre-matured slurry is immediately mixed with the high-speed flowing preparation water in the second liquid inlet pipe 11 in a turbulent flow. The mixing uniformity is better than that of stirring in a traditional container, which is beneficial to the subsequent complete maturation reaction.

[0019] The device 100 proposed in this invention for improving the curing degree of magnesium oxide reagent, through the pre-curing container 7, the negative pressure generating structure 10 and the dosing container 12, realizes the efficient and continuous preparation of magnesium oxide reagent, significantly improves the curing degree of magnesium oxide and reagent utilization rate, and at the same time reduces equipment cost, energy consumption and clogging risk, providing a stable and reliable dosing guarantee for wastewater treatment.

[0020] In an optional embodiment of the present invention, a first stirrer 1 is provided in the pre-curing container 7 for stirring and mixing magnesium oxide powder with pre-curing water to promote the hydration reaction.

[0021] This invention also proposes a method for treating wastewater using magnesium oxide reagents, such as... Figure 1 As shown, the methods for treating wastewater using magnesium oxide include: A predetermined amount of magnesium oxide powder is added into the pre-curing container 7, and pre-curing water is injected into the pre-curing container 7 to the predetermined liquid level and stirred continuously. Part of the magnesium oxide undergoes a hydration reaction and forms a pre-curing slurry. The pre-cured slurry is introduced from the pre-cured container 7 into the dosing container 12. Dosing water is injected into the dosing container 12 and the pre-cured slurry and dosing water are adjusted to a predetermined mixing ratio so that the pre-cured slurry and dosing water are in continuous contact until all the magnesium oxide has undergone a hydration reaction to form a fully cured magnesium oxide agent. Fully matured magnesium oxide reagent is added to the production wastewater for chemical flocculation.

[0022] The present invention proposes a method for treating wastewater using magnesium oxide as a reagent. First, pre-cooking is performed to partially hydrate the magnesium oxide and form a pre-cooked slurry with good fluidity. Then, complete cooking is performed. By adjusting the ratio and continuous contact, it is ensured that all magnesium oxide particles have sufficient time and water to complete the hydration reaction, thereby improving the cooking rate, reducing unreacted magnesium oxide residue, and significantly improving the degree of cooking and utilization of magnesium oxide.

[0023] The method for treating wastewater using magnesium oxide reagent proposed in this invention allows the pre-curing container 7 to operate intermittently or continuously, while the dosing container 12 adjusts the output of magnesium oxide reagent according to the real-time needs of wastewater treatment. This separates the preparation of magnesium oxide reagent from the addition of magnesium oxide powder, facilitating continuous, stable, and on-demand supply of reagents. It is highly adaptable and suitable for continuous wastewater treatment.

[0024] In an optional embodiment of the present invention, the pre-cured slurry is introduced from the pre-curing container 7 to the dosing container 12 by allowing the dosing water to flow through the negative pressure generating structure 10 to generate negative pressure, which then draws the pre-cured slurry from the pre-curing container 7 into the dosing container 12. Using the negative pressure generating structure 10 to draw the pre-cured slurry into the dosing container 12 reduces the number of components such as pumps, motors, and control valves, thus lowering equipment costs, installation space, and potential points of failure. Simultaneously, as the flow rate of the dosing water increases, the negative pressure increases, and the amount of pre-cured slurry drawn in automatically increases synchronously, achieving coarse ratio adjustment without additional control.

[0025] In an optional embodiment of the present invention, the apparatus 100 for improving the aging degree of magnesium oxide agent further includes: The dosing mechanism is used to quantitatively add magnesium oxide powder into the pre-curing container 7; The first liquid inlet pipe 2 is connected to the pre-cooking container 7 and is used to inject pre-cooking water into the pre-cooking container 7.

[0026] In this embodiment, magnesium oxide powder is quantitatively added into the pre-curing container 7 through a dosing mechanism, and production water is added into the pre-curing container 7 through the first liquid inlet pipe 2.

[0027] In an optional example of this embodiment, the dosing mechanism includes a screw conveyor 4 and a precision weighing mechanism 5. By adjusting the rotation speed or running time of the screw conveyor 4, magnesium oxide powder can be stably and continuously conveyed from the hopper to the pre-curing container 7, avoiding the randomness and unevenness of manual dosing. Simultaneously, the precision weighing mechanism 5 can employ a weighing hopper or a loss-in-weight feeder to measure the weight of the conveyed magnesium oxide powder in real time and compare it with a set value. This feedback controls the start / stop or rotation speed of the screw conveyor 4, achieving closed-loop metering and effectively improving dosing accuracy.

[0028] In an optional embodiment of this method, the apparatus 100 for increasing the aging degree of the magnesium oxide agent further includes: The first level gauge (not shown in the figure) is installed inside the pre-curing container 7 and is used to measure the level of liquid inside the pre-curing container 7. The first water inlet control valve (not shown in the figure) is installed on the first liquid inlet pipe 2, and the first water inlet control valve is connected to the first liquid level gauge signal. When the water level in the pre-curing container 7 is lower than the first predetermined liquid level, the first liquid level gauge controls the first water inlet control valve to open. When the water level reaches the first predetermined liquid level, the first liquid level gauge controls the first water inlet control valve to close, thereby ensuring that the liquid level in the pre-curing container 7 is always maintained within the set range, providing stable and sufficient pre-curing water for magnesium oxide powder, avoiding overflow or low concentration due to excessively high water level, and also avoiding powder accumulation, insufficient mixing or incomplete reaction due to excessively low water level.

[0029] In an optional embodiment of the present invention, the apparatus 100 for improving the aging degree of magnesium oxide agent further includes: The second level gauge is installed inside the drug preparation container 12 and is used to measure the liquid level inside the drug preparation container 12. Automatic regulating valve 9 is installed on the connecting pipe 8 and is connected to the signal of the second level gauge. When the liquid level in the dispensing container 12 is lower than the second predetermined liquid level, the second liquid level gauge controls the automatic regulating valve 9 to open; when the liquid level reaches the second predetermined liquid level, the second liquid level gauge controls the automatic regulating valve 9 to close.

[0030] In an optional embodiment of the invention, the negative pressure generating structure 10 is a diffuser with a Venturi structure. When the water used for dispensing medicine flows through the contraction section of the diffuser, the flow velocity increases and the pressure decreases, creating a negative pressure at the throat. In the expansion section, the flow velocity recovers and the pressure rises. The pre-cured slurry is drawn into the throat of the diffuser from the negative pressure interface, and comes into instantaneous contact with the high-speed flowing water used for dispensing medicine, generating intense turbulent shearing and mixing.

[0031] In an optional embodiment of the present invention, the disturbance mechanism includes a second stirrer 16 and a guide tube 13. The guide tube 13 is coaxially disposed inside the drug preparation container 12. A liquid inlet channel is provided at the bottom of the guide tube 13. The blades of the second stirrer 16 are located inside the guide tube 13. When the second stirrer 16 rotates, it generates lift and pushing force, so that the drug preparation water and the pre-cooked slurry water enter the guide tube 13 through the liquid inlet channel and continuously circulate and mix in the guide tube 13. The liquid outlet pipe 15 is connected to the guide tube 13.

[0032] During operation, the second agitator 16 rotates, generating lift and propulsion, causing the water for preparing the medicine and the pre-cooked slurry to enter the guide cylinder 13 through the bottom inlet channel and move upward within the guide cylinder 13. Subsequently, the slurry flows out from the top of the guide cylinder 13 and flows downward outside the guide cylinder 13, thus forming a complete liquid circulation. This liquid circulation effectively reduces the flow dead zone within the medicine preparation container 12, not only reducing local concentration differences or temperature unevenness, but also preventing magnesium oxide particles from settling and caking in the medicine preparation container 12.

[0033] In an optional embodiment, the bottom of the flow guide tube 13 is fixed to the bottom surface of the dispensing container 12 by a foot plate 14.

[0034] In an optional embodiment of the present invention, the pre-cooking container 7 and the dispensing container 12 are an integral cylindrical structure, with the pre-cooking container 7 and the dispensing container 12 arranged vertically and separated by a partition in the middle, thereby saving the footprint of the entire device and reducing equipment investment.

[0035] In an optional example of this implementation, the first stirrer 1 and the second stirrer 16 are coaxially arranged and driven by the same drive mechanism.

[0036] In an optional example, the drive mechanism is located on top of the pre-cooking container 7.

[0037] In an optional embodiment of the present invention, the top of the pre-curing container 7 is connected to an overflow pipe 6, and the other end of the overflow pipe 6 is connected to the dispensing container 12. Excess pre-curing slurry in the pre-curing container 7 is sent into the dispensing container 12 through the overflow pipe 6.

[0038] In an optional embodiment of the present invention, the top of the pre-curing container 7 is provided with an exhaust port 3 for discharging the gas generated by the hydration reaction into the atmosphere.

[0039] Please refer to Figure 3 As shown, the method for treating wastewater using magnesium oxide reagent and the apparatus 100 for improving the maturation degree of magnesium oxide reagent proposed in this invention will now be described in detail with reference to an embodiment.

[0040] In this embodiment, the apparatus 100 for improving the aging degree of magnesium oxide reagent includes: The pre-curing container 7 is a curing tank that can hold magnesium oxide and water, enabling the storage of magnesium oxide and water; The dosing container 12 is a dosing tank that can hold magnesium oxide and water, so as to realize the quantitative dosing of magnesium oxide and water and the storage of the reagent; The mixer includes a drive mechanism, a drive shaft, a first stirrer 1 and a second stirrer 16. The first stirrer 1 and the second stirrer 16 each include multiple rotatable blades. The drive mechanism drives the multiple rotatable blades to rotate through the drive shaft to achieve uniform mixing of magnesium oxide particles and water. Connecting pipe 8 is a liquid conveying pipe used to convey pre-cooked slurry to the dosing container 12; The first liquid inlet pipe 2 is a liquid conveying pipe that delivers pre-cooked water into the pre-cooked container 7. Exhaust port 3 is a pipe that allows gas to pass through, enabling the emission of gases generated during the pre-cooking process; The screw conveyor mechanism 4 is a power device for screw conveying, which realizes the conveying of magnesium oxide from the hopper to the pre-curing container 7; The precision weighing mechanism 5 is a device that can weigh the magnesium oxide in the hopper, thereby achieving accurate measurement of the amount of magnesium oxide added. Overflow pipe 6 is a liquid conveying pipe that enables excess pre-cured slurry to be conveyed from pre-cured container 7 to dosing container 12.

[0041] Automatic regulating valve 9 is a valve that can automatically adjust its opening to control and regulate the flow rate of pre-cooked slurry. A diffuser tube is a liquid delivery pipeline that uses a high-flow-rate liquid inlet to generate negative pressure and automatically add pre-cured magnesium oxide. The second liquid inlet pipe 11 is a liquid conveying pipe that delivers the water for drug preparation to the inside of the drug preparation container 12. Anchor plate 14: A steel plate fixed to the bottom of the dispensing container 12 to fix the guide tube 13 and guide the magnesium oxide agent; The guide tube 13 is a cylinder that guides the flow and mixing of magnesium oxide and water, so as to achieve full mixing of magnesium oxide and water; The liquid outlet pipe 15 is a liquid conveying pipe that enables the dispensing of the medicine from the preparation container 12.

[0042] In this embodiment, as Figure 3 As shown, the specific implementation process is as follows: Magnesium oxide powder is quantitatively added into the pre-curing container 7 via a screw conveyor 4 and a weighing mechanism 5. Pre-curing water is added into the pre-curing container 7 through the first inlet pipe 2. The water level is controlled by a first level gauge. Water intake stops when the water level reaches the first predetermined level of the pre-curing container 7, and resumes when the water level drops to the first predetermined level, with a quantitative amount of magnesium oxide added. The first stirrer 1 is rotated at high speed to ensure thorough mixing of the water and magnesium oxide particles. During this process, the magnesium oxide particles undergo a hydration reaction, completing the pre-curing process. The pre-cured magnesium oxide granules in the pre-curing container 7 are fed into the mixing container 12 via the negative pressure generated by the diffuser through the second inlet pipe 11 and the connecting pipe 8. The ratio of pre-cured slurry to mixing water is controlled by adjusting the opening of the automatic regulating valve 9. The valve 9 is controlled by a level gauge: when the liquid level in the mixing container 12 is lower than the second predetermined level, the mixing begins; when the liquid level in the mixing container 12 reaches the second predetermined level, the mixing stops. The magnesium oxide granules and mixing water are thoroughly mixed in the guide tube 13 fixed to the base plate 14 by the lift and pushing force generated by the rotation of the second agitator 16 to achieve complete curing. During this process, the sufficient agitation prevents the magnesium oxide granules from settling and caking in the mixing container. The prepared magnesium oxide reagent is sent to the desiliconization dosing point through the outlet pipe 15. Waste gas generated during pre-cooking and dosing is released into the atmosphere through the exhaust port 3 at the top, and excess pre-cooked slurry enters the dosing container 12 through the overflow pipe 6.

[0043] It should be noted that in this embodiment, both the pre-cooking water and the chemical preparation water can be production water. In the steel industry, production water refers to clarified water after coagulation and sedimentation treatment, or recycled water after physical, chemical and biological treatment, which can be used as raw material for producing boiler feedwater, circulating water and process water.

[0044] The apparatus 100 for improving the maturation degree of magnesium oxide reagent and the method for treating wastewater using magnesium oxide reagent proposed in this invention improve the maturation degree of magnesium oxide reagent through a pre-maturation step, thereby improving the utilization efficiency of magnesium oxide.

[0045] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. An apparatus for improving the aging degree of magnesium oxide reagent, characterized in that, The device for improving the aging degree of magnesium oxide reagent includes: A pre-curing container is used to mix magnesium oxide powder with pre-curing water and carry out a hydration reaction to generate pre-curing slurry. A dispensing container is used to receive the pre-cooked slurry and mix it with dispensing water to generate a fully cooked magnesium oxide agent; The second liquid inlet pipe is used to inject the medicine preparation water into the medicine preparation container. The second liquid inlet pipe is equipped with a negative pressure generating structure, and the medicine preparation water generates negative pressure when it flows through the negative pressure generating structure. A connecting pipe connects the pre-curing container to the negative pressure generating structure. The negative pressure is used to draw the pre-curing slurry from the pre-curing container through the connecting pipe into the second liquid inlet pipe, where it is mixed with the medicine preparation water and then enters the medicine preparation container together. A disturbance mechanism is provided inside the drug preparation container to keep the drug preparation water and the pre-cooked slurry in motion; The liquid outlet pipe is connected to the drug preparation container and is used to output the fully matured magnesium oxide reagent.

2. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The pre-curing container is equipped with a first stirrer for stirring and mixing magnesium oxide powder with pre-curing water to promote the hydration reaction.

3. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The apparatus for improving the aging degree of magnesium oxide reagent further includes: The dosing mechanism is used to quantitatively add magnesium oxide powder into the pre-curing container; The first liquid inlet pipe is connected to the pre-cooking container and is used to inject pre-cooking water into the pre-cooking container.

4. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 3, characterized in that, The apparatus for improving the aging degree of magnesium oxide reagent further includes: A first level gauge is installed inside the pre-curing container to measure the liquid level inside the pre-curing container; A first water inlet control valve is installed on the first liquid inlet pipe. The first water inlet control valve is connected to the first liquid level gauge. When the water level in the pre-curing container is lower than the first predetermined liquid level, the first liquid level gauge controls the first water inlet control valve to open. When the water level reaches the first predetermined liquid level, the first liquid level gauge controls the first water inlet control valve to close.

5. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The apparatus for improving the aging degree of magnesium oxide reagent further includes: The second level gauge is installed inside the drug preparation container and is used to measure the liquid level inside the drug preparation container; An automatic regulating valve is installed on the connecting pipeline. The automatic regulating valve is signal-connected to the second liquid level gauge. When the liquid level in the dispensing container is lower than a second predetermined liquid level, the automatic regulating valve is controlled to open. When the liquid level reaches the second predetermined liquid level, the second liquid level gauge controls the automatic regulating valve to close.

6. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The disturbance mechanism includes a second stirrer and a guide tube. The guide tube is coaxially arranged inside the drug preparation container. A liquid inlet channel is opened at the bottom of the guide tube. The blades of the second stirrer are located inside the guide tube. When the second stirrer rotates, it generates lift and thrust, so that the drug preparation water and the pre-cooked slurry water continuously circulate and mix in the guide tube. The liquid outlet pipe is connected to the guide tube.

7. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The top of the pre-cooking container is connected to an overflow pipe, and the other end of the overflow pipe is connected to the dispensing container. Excess pre-cooked slurry in the pre-cooking container is sent into the dispensing container through the overflow pipe.

8. The apparatus for improving the aging degree of magnesium oxide reagent as described in claim 1, characterized in that, The pre-curing container is equipped with an exhaust port at the top for releasing the gases produced by the hydration reaction into the atmosphere.

9. A method for treating wastewater using magnesium oxide reagent, characterized in that, The method for treating wastewater using magnesium oxide reagent includes: A predetermined amount of magnesium oxide powder is added to a pre-curing container, and pre-curing water is injected into the pre-curing container to a predetermined level while continuously stirring. Part of the magnesium oxide undergoes a hydration reaction and forms a pre-curing slurry. The pre-cured slurry is introduced from the pre-curing container into the dosing container, dosing water is injected into the dosing container and the pre-cured slurry and the dosing water are adjusted to a predetermined mixing ratio, so that the pre-cured slurry and the dosing water are in continuous contact until all the magnesium oxide has undergone a hydration reaction to form a fully cured magnesium oxide agent. The fully matured magnesium oxide agent is added to the production wastewater for chemical flocculation.

10. The method for treating wastewater using magnesium oxide as described in claim 9, characterized in that, The pre-cured slurry is introduced from the pre-curing container to the dispensing container by allowing the dispensing water to flow through a negative pressure generating structure to generate negative pressure, and using the negative pressure to draw the pre-cured slurry into the dispensing container.

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