Mineralization reaction device based on two-stage series gradient mineralization and operation method

Abstract

This invention provides a mineralization reaction device and its operation method based on two-stage series gradient mineralization. The mineralization reaction device includes: a mineralization reaction unit, comprising at least a first and a second mineralization reaction tank connected in series; a gradient control unit, including a mineralization addition subunit, wherein the outlet of the mineralizing agent storage tank is connected to the first and second mineralization reaction tanks via first and second addition pipelines, and first and second metering feeders are respectively installed on the first and second addition pipelines; an intelligent monitoring and control unit, including intelligent monitoring and control components, which are respectively connected to the stirring motors of the first and second mineralization reaction tanks and the first and second metering feeders; and a solid-liquid separation unit, with the slurry inlet connected to the outlet of the mineralization reaction unit. This mineralization reaction device and its operation method, through the coordinated operation of each unit and gradient control, can realize gradient mineralization, graded purification, and continuous production of the effluent from the pretreatment water system of a gypsum processing system.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial solid waste resource utilization and mineralization equipment, specifically relating to a mineralization reaction device and its operation method based on two-stage series gradient mineralization. Background Technology

[0002] In the industrial solid waste resource utilization process, mineralization reaction is the core and key step in converting solid waste into high-value-added products (such as calcium carbonate and ammonium sulfate). The reaction efficiency directly determines the purity, conversion rate, and resource utilization value of the product. The purified slurry after pretreatment (such as desulfurized gypsum pretreated with Ca) is rich in Ca... 2+ SO4 2- The slurry needs to undergo mineralization reactions to achieve ion conversion and product precipitation, ultimately yielding qualified mineralized products. Currently, most existing mineralization reaction devices adopt a single reaction tank structure, which can only achieve mineralization reactions under single conditions. This results in many insurmountable technical defects, and there is no technical connection with pretreatment equipment, making it impossible to form synergy, but there is no technical conflict.

[0003] Existing single-stage mineralization reactors cannot achieve gradient mineralization control based on changes in ion concentration and reaction progress in the slurry, resulting in incomplete mineralization reactions, uneven product purity, and problems such as agglomeration and impurity residue in some products due to unsuitable reaction conditions. Furthermore, existing devices lack precise gradient control structures, making it difficult to flexibly adjust key parameters such as reaction temperature, pH value, and mineralizer dosage, thus failing to meet the mineralization requirements of different pretreated slurries. In addition, existing devices are mostly open structures, resulting in low slurry utilization, limited mineralization reaction conversion rates, and a disconnect between solid-liquid separation and mineralization reactions, leading to low product recovery rates, cumbersome subsequent purification processes, and further increasing resource recovery costs. For example, single-stage mineralization reactor equipment, represented by CN202420567890.1, has a core structure consisting of only a single reactor, along with a simple stirring device and mineralizer addition port. It can only achieve mineralization under single conditions, cannot perform gradient control, and results in insufficient mineralization, low product purity, and low conversion rate. This equipment does not involve any pretreatment-related technologies, and its single-reaction structure cannot meet the needs of graded mineralization. Multi-stage parallel mineralization equipment, represented by CN202321987654.8, adopts a design of multiple reactors in parallel, with each reactor operating independently. It can only achieve simultaneous mineralization of multiple batches, and cannot achieve gradient progressive mineralization. Furthermore, the parameters of each reactor cannot be precisely coordinated and controlled, resulting in defects such as slurry waste, high energy consumption, and uneven product purity. This equipment also does not involve pretreatment-related technologies and fails to achieve gradient progressive reaction, thus failing to solve the core pain points of existing technologies.

[0004] Furthermore, existing mineralization equipment lacks a precise connection structure with pretreatment equipment, hindering continuous production. It also lacks closed-loop slurry circulation and gradient control components, resulting in low mineralization efficiency and product recovery rates. Specifically, existing mineralization reaction devices suffer from the following core defects, making it difficult to meet the requirements for gradient mineralization and precise purification of pretreated slurry. The root causes of these defects are clearly defined: (1) Low mineralization efficiency and insufficient reaction: The existing equipment adopts a single reaction tank structure, which cannot achieve gradient progressive mineralization. The ion conversion in the slurry is incomplete, and the mineralization reaction conversion rate is low. The root cause is that the equipment structure design is unreasonable, and the process difference of mineralization reaction is not considered. The reaction conditions cannot be accurately controlled according to the reaction stage, resulting in some ions not being completely converted and the reaction efficiency being low.

[0005] (2) Uneven product purity and poor classification effect: The existing equipment cannot achieve gradient control and the reaction conditions are simple, resulting in uneven particle size of mineralized products and residual impurities. It is impossible to achieve product classification and purification, and it is difficult to meet the raw material requirements of high value-added products. The root cause is that the equipment lacks gradient control components, cannot adjust mineralization parameters according to the reaction process, and has not designed a graded solid-liquid separation structure, so the products and impurities cannot be effectively separated.

[0006] (3) Inaccurate parameter control and poor adaptability: Existing equipment mostly uses manual adjustment of reaction parameters, which cannot monitor the reaction process in real time and automatically adjust key parameters such as temperature, pH value, and mineralizer addition amount. It is difficult to adapt to slurries with different components and concentrations after pretreatment. The root cause is that the equipment lacks perfect intelligent monitoring and control components, fails to realize closed-loop control of reaction parameters, and has poor adaptability due to lagging parameter adjustment.

[0007] (4) Low slurry utilization and high energy consumption: Most existing equipment is an open structure, and the slurry passes through the reaction tank once, without realizing the recycling of unreacted slurry, resulting in slurry waste; at the same time, each reaction unit operates independently, resulting in high energy consumption; the root cause is that the equipment is not designed with a closed-loop slurry circulation structure, resulting in low resource utilization and no optimized energy consumption design, resulting in energy waste.

[0008] (5) Unable to achieve continuous production and poor connectivity: The existing equipment is not designed with a precise connection structure with the pretreatment equipment. The slurry after pretreatment needs to be transferred manually, which makes it impossible to achieve continuous production of pretreatment-mineralization. The process is complicated and the labor cost is high. The root cause is that the equipment lacks a dedicated series conveying component and does not consider the collaborative needs of the whole process of solid waste resource utilization, resulting in poor connectivity.

[0009] With the increasing demands for industrial solid waste resource utilization and the continuous improvement of pretreatment technology, there is an urgent need for a mineralization reaction device that can achieve gradient mineralization, precise control, and continuous production. This device would solve the technical bottlenecks of existing single mineralization equipment, connect with pretreatment equipment to realize a closed-loop process for solid waste resource utilization, and promote the development of industrial solid waste resource utilization towards high efficiency, precision, and tiered management.

[0010] Therefore, given the current state of industrial solid waste resource utilization, there is an urgent need for a new type of mineralization reaction device to overcome the technical bottlenecks of existing devices. Summary of the Invention

[0011] The first objective of this invention is to provide a mineralization reaction apparatus based on two-stage serial gradient mineralization, thereby solving at least one of the aforementioned technical problems.

[0012] The second objective of this invention is to provide an operating method for a mineralization reaction device based on two-stage series gradient mineralization.

[0013] To achieve the first objective of this invention, the following technical solution is adopted: A mineralization reaction device based on two-stage tandem gradient mineralization, comprising: It includes a mineralization reaction unit, a gradient control unit, a solid-liquid separation unit, and an intelligent monitoring and control unit; among which, The mineralization reaction unit includes at least a first mineralization reaction tank and a second mineralization reaction tank connected in series. The slurry feed of the first mineralization reaction tank is the effluent from the pretreatment water system of the gypsum processing system. The bottom slurry outlet of the first mineralization reaction tank is connected to the top slurry inlet of the second mineralization reaction tank, which is used to perform graded mineralization treatment on the effluent from the pretreatment water system of the gypsum processing system, which is the slurry. The gradient control unit includes a mineralization addition subunit, which includes a mineralization agent storage bin, a first addition pipe, a second addition pipe, a first metering feeder, and a second metering feeder. The outlet of the mineralization agent storage bin is connected to the dosing port of the first mineralization reaction tank via the first addition pipe and to the dosing port of the second mineralization reaction tank via the second addition pipe. The first metering feeder is mounted on the first addition pipe, and the second metering feeder is mounted on the second addition pipe. This is used to gradient control the amount of mineralization agent added from the mineralization agent storage bin to the first and second mineralization reaction tanks, ensuring that the amount of mineralization agent added to the first mineralization reaction tank is greater than the amount added to the second mineralization reaction tank, thus forming a mineralization agent addition gradient. The intelligent monitoring and control unit includes an intelligent monitoring and control component, which is connected to the stirring motor, the first metering feeder, and the second metering feeder of the first mineralization reaction tank and the second mineralization reaction tank, respectively, for controlling the stirring speed in the first mineralization reaction tank and the second mineralization reaction tank, as well as the amount of mineralizing agent added in the first mineralization reaction tank and the second mineralization reaction tank. The slurry inlet of the solid-liquid separation unit is connected to the discharge outlet of the mineralization reaction unit, and is used to perform solid-liquid separation on the discharge from the mineralization reaction unit to output clear liquid and mineralization products.

[0014] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the first mineralization reaction tank has a cylindrical body with an arc-shaped bottom surface; the second mineralization reaction tank has a cylindrical body with a conical bottom surface, preferably with a cone angle of 40~60°.

[0015] This invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, a first temperature jacket is provided on the side wall of the first mineralization reaction tank to regulate the reaction temperature inside the first mineralization reaction tank; a second temperature jacket is provided on the side wall of the second mineralization reaction tank to regulate the reaction temperature inside the second mineralization reaction tank; preferably, the intelligent monitoring and control component is also signal-connected to the first temperature jacket and the second temperature jacket respectively, and adjusts the heating temperature of the first temperature jacket and the second temperature jacket to control the reaction temperature inside the first mineralization reaction tank and the second mineralization reaction tank.

[0016] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the reaction temperature in the first mineralization reaction tank is greater than the reaction temperature in the second mineralization reaction tank, forming a temperature gradient. Preferably, the reaction temperature in the first mineralization reaction tank is 60~70 ℃ and the reaction temperature in the second mineralization reaction tank is 40~50 ℃.

[0017] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the pH in the first mineralization reaction tank is greater than the pH in the second mineralization reaction tank, forming a pH gradient; more preferably, the pH in the first mineralization reaction tank is 8.0~8.5 and the pH in the second mineralization reaction tank is 7.0~7.5.

[0018] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the amount of mineralizing agent added in the first mineralization reaction tank is 5-8 wt%, and the amount of mineralizing agent added in the second mineralization reaction tank is 3-5 wt%.

[0019] The present invention is a mineralization reaction device based on two-stage serial gradient mineralization. Preferably, the reaction time of the first-stage mineralization reaction in the first mineralization reaction tank is 20-30 min, and the reaction time of the second-stage mineralization reaction in the second mineralization reaction tank is 15-20 min.

[0020] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the mineralization reaction unit further includes a series conveying assembly, which includes a series conveying pipeline, a conveying pump, and a flow regulating valve. The inlet end of the series conveying pipeline is connected to the bottom outlet of the first mineralization reaction tank, and the outlet end is connected to the top inlet of the second mineralization reaction tank. The conveying pump and the flow regulating valve are sequentially arranged on the series conveying pipeline in the direction of material flow.

[0021] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, a flow meter is also provided on the series conveying pipeline. The flow meter is located downstream of the flow regulating valve and is used to detect the flow rate downstream of the flow regulating valve.

[0022] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the intelligent monitoring and control component is also connected to the delivery pump, the flow regulating valve and the flow meter respectively, and controls the operation of the delivery pump and the flow regulating valve according to the flow signal received from the flow meter.

[0023] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the gradient control unit further includes a pH control subunit. The pH control subunit includes a first pH detector and a second pH detector; The first pH detector is installed on the side wall of the first mineralization reaction vessel and is used to detect the pH inside the first mineralization reaction vessel. The second pH meter is installed on the side wall of the second mineralization reaction vessel and is used to detect the pH inside the second mineralization reaction vessel; The intelligent monitoring and control component is also connected to the first pH detector and the second pH detector respectively, and controls the first metering feeder according to the pH signal received from the first pH detector and controls the second metering feeder according to the pH signal received from the second pH detector, so as to adjust the amount of mineralizer fed by the first metering feeder and the second metering feeder, thereby controlling the pH in the first mineralization reaction tank and the second mineralization reaction tank.

[0024] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the gradient control unit further includes a temperature control subunit. The temperature control subunit includes a first temperature detector and a second temperature detector. The first temperature detector is installed on the side wall of the first mineralization reaction vessel and is used to detect the reaction temperature inside the first mineralization reaction vessel. The second temperature detector is installed on the side wall of the second mineralization reaction vessel and is used to detect the reaction temperature inside the second mineralization reaction vessel; The intelligent monitoring and control component is also connected to the first temperature detector and the second temperature detector respectively, and controls the first temperature jacket according to the temperature signal received from the first temperature detector and controls the second temperature jacket according to the temperature signal received from the second temperature detector, so as to adjust the heating temperature of the first temperature jacket and the second temperature jacket, thereby controlling the reaction temperature in the first mineralization reaction tank and the second mineralization reaction tank.

[0025] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the mineralization reaction device further includes a slurry circulation component, which includes a circulation pipeline, a circulation pump, and a one-way valve. The slurry inlet of the circulation pipeline is connected to the clear liquid outlet of the solid-liquid separation unit, and the slurry outlet is connected to the slurry inlet of the first mineralization reaction tank. The circulation pump and the one-way valve are respectively installed on the circulation pipeline.

[0026] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, a turbidity detector is installed on the clear liquid output pipe of the solid-liquid separation unit to detect the turbidity of the clear liquid from the solid-liquid separation unit.

[0027] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the intelligent monitoring and control component is also connected to the circulation pump, the one-way valve and the turbidity detector respectively, and controls the circulation pump and the one-way valve according to the turbidity signal received from the turbidity detector, so that the clear liquid in the solid-liquid separation unit is discharged when the turbidity is ≤ 15 NTU, otherwise it is circulated to the first mineralization reaction tank.

[0028] The present invention relates to a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the solid-liquid separation unit includes a graded filter, the inlet end of which is connected to the outlet of the mineralization reaction unit for graded filtration of the output of the mineralization reaction unit. The filtrate is output as clear liquid, and the mineralization product is output with the turbid liquid.

[0029] The present invention is a mineralization reaction device based on two-stage series gradient mineralization. Preferably, the solid-liquid separation unit further includes a sedimentation tank and a product collection tank. The feed end of the sedimentation tank is connected to the turbid liquid outlet of the graded filter. The sedimentation tank and the product collection tank are arranged in sequence according to the material flow direction for sequentially sedimenting and collecting the turbid liquid from the graded filter.

[0030] The present invention is based on a mineralization reaction device for two-stage series gradient mineralization. Preferably, the mineralizing agent includes any one or more combinations of ammonium bicarbonate, sodium carbonate, and sodium bicarbonate.

[0031] To achieve the second objective of the present invention, an operating method for a mineralization reaction apparatus based on two-stage series gradient mineralization is also provided, wherein the operating method uses the aforementioned mineralization reaction apparatus.

[0032] The beneficial effects of this invention are as follows: This invention relates to a mineralization reaction device and its operation method based on two-stage series gradient mineralization. Through the coordinated work of each unit and gradient control, it can realize gradient mineralization, graded purification and continuous production of the effluent from the pretreatment water system of the gypsum processing system.

[0033] This invention relates to a mineralization reaction device and its operation method based on a two-stage series gradient mineralization, which has significant gradient mineralization effect and greatly improved mineralization efficiency: through a two-stage series gradient mineralization structure, combined with gradient control of reaction temperature, pH value, and mineralizer addition amount, progressive mineralization of slurry is achieved, solving the problem of insufficient mineralization in existing equipment. The mineralization reaction conversion rate is ≥98%, which is more than 40% higher than that of existing single mineralization equipment. Ion conversion is thorough, and the mineralization effect is stable and quantifiable.

[0034] This invention relates to a mineralization reaction device and its operation method based on two-stage series gradient mineralization. The product is graded and purified to meet the purity standard: the solid-liquid separation unit realizes the graded filtration and purification of mineralization products. The coarse and fine products can be adapted to the preparation needs of different high value-added products. The purity of the mineralization product is ≥97%, which is more than 35% higher than that of the existing equipment. This solves the problems of uneven product purity and impurity residue in the existing equipment and enhances the value of resource utilization. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the mineralization reaction device based on two-stage series gradient mineralization in one embodiment of the present invention. Detailed Implementation

[0036] The technical solution and its effects of the present invention will be further described below with reference to specific embodiments / examples. The following embodiments / examples are only for illustrating the content of the present invention, and the invention is not limited to the following embodiments or examples. Simple modifications made to the present invention based on the concept of the present invention are all within the scope of protection claimed by the present invention.

[0037] like Figure 1 As shown, this invention provides a mineralization reaction device based on two-stage series gradient mineralization. It includes a mineralization reaction unit, a gradient control unit, a solid-liquid separation unit, and an intelligent monitoring and control unit; among which, The mineralization reaction unit includes at least a first mineralization reaction tank 11 and a second mineralization reaction tank 12 connected in series. The slurry feed of the first mineralization reaction tank 11 is the effluent from the pretreatment water system of the gypsum processing system. The bottom slurry outlet of the first mineralization reaction tank 11 is connected to the top slurry inlet of the second mineralization reaction tank 12, which is used to perform graded mineralization treatment on the effluent from the pretreatment water system of the gypsum processing system, which is used as slurry. The gradient control unit includes a mineralization addition subunit, which includes a mineralizer storage bin 21, a first addition pipe 22, a second addition pipe 23, a first metering feeder 24, and a second metering feeder 25. The outlet of the mineralizer storage bin 21 is connected to the dosing port of the first mineralization reaction tank 11 via the first addition pipe 22 and to the dosing port of the second mineralization reaction tank 12 via the second addition pipe 23. The first metering feeder 24 is mounted on the first addition pipe 22, and the second metering feeder 25 is mounted on the second addition pipe 23. This gradient control unit is used to control the amount of mineralizer added from the mineralizer storage bin 21 to the first and second mineralization reaction tanks 11 and 12, ensuring that the amount of mineralizer added to the first mineralization reaction tank 11 is greater than the amount of mineralizer added to the second mineralization reaction tank 12, thus forming a mineralizer addition gradient. The intelligent monitoring and control unit includes an intelligent monitoring and control component 31, which is connected to the stirring motors of the first mineralization reaction tank 11 and the second mineralization reaction tank 12, the first metering feeder 24 and the second metering feeder 25 respectively, and is used to control the stirring speed in the first mineralization reaction tank 11 and the second mineralization reaction tank 12, as well as the amount of mineralizing agent added in the first mineralization reaction tank 11 and the second mineralization reaction tank 12. The slurry inlet of the solid-liquid separation unit is connected to the discharge outlet of the mineralization reaction unit, and is used to perform solid-liquid separation on the discharge from the mineralization reaction unit to output clear liquid and mineralization products.

[0038] Those skilled in the art will understand that the effluent from the pretreatment water system of a gypsum processing system contains calcium ions (Ca²⁺).+ SO4 2 When gypsum (CaSO4·2H2O) is mixed with a mineralizing agent (carbonate), the carbonate ions in the mineralizing agent undergo transformation reactions with the calcium ions and gypsum ions in the slurry, respectively, as follows: Ca 2+ +CO3 2 →CaCO3↓;CaSO4 2H2O + CO3 2 →CaCO3↓+SO4 2 +2H₂O, thus forming calcium carbonate precipitate and sulfate ions; among which, the calcium carbonate precipitate is output as a mineralization product; SO₄²⁻ 2 The sulfate impurities in the mineralized products are reduced by outputting the clarified liquid.

[0039] In the first mineralization reaction vessel 11, a high dosage of mineralizing agent can promote the rapid precipitation of CaCO3, and following the homogeneous nucleation mechanism, a large number of fine crystal nuclei are rapidly generated, providing "seeds" for subsequent growth. At the same time, some SO4 is removed through co-precipitation. 2 Released into the liquid phase; in the second mineralization reaction vessel 12, a mineralizing agent dosage gradient is formed through lower mineralizing agent dosage, and the residual gypsum is further converted to increase Ca. 2+ The conversion rate is high, and following the heterogeneous growth mechanism, epitaxial growth is performed on existing crystal nuclei, suppressing secondary nucleation, and obtaining calcium carbonate with uniform particle size and high purity.

[0040] This invention relates to a mineralization reaction device based on a two-stage series gradient mineralization process. Through the coordinated operation of each unit and gradient control, it can achieve gradient mineralization, graded purification, and continuous production of the effluent from the pretreatment water system of a gypsum processing system. Specifically, the mineralization reaction unit, through a mineralizer addition subunit, gradient-controlled the amount of mineralizer added from the mineralizer storage tank 21 to the first mineralization reaction tank 11 and the second mineralization reaction tank 12, ensuring that the amount of mineralizer added in the first mineralization reaction tank 11 is greater than that in the second mineralization reaction tank 12. This creates a gradient in the amount of mineralizer added, ensuring a gradual and progressive mineralization reaction, which helps to achieve gradient mineralization and graded purification of the effluent from the pretreatment water system of the gypsum processing system. The intelligent monitoring and control unit, through the intelligent monitoring and control component 31, can intelligently control the gradient adjustment of the mineralizer addition amount.

[0041] In one embodiment, the mineralizing agent includes any one or more combinations of ammonium bicarbonate, sodium carbonate, and sodium bicarbonate.

[0042] In one embodiment, the body of the first mineralization reaction tank 11 is cylindrical with an arc-shaped bottom structure; preferably, the radius of the arc-shaped bottom structure is 120~180 mm, such as 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm and 180 mm and any value and range within this range, so as to facilitate uniform mixing of the slurry and avoid material residue; The second mineralization reaction tank 12 has a cylindrical body with a conical bottom structure. The cone angle is preferably 40-60°, such as 40°, 45°, 50°, 55° and 60°, as well as any value and range within this range, so as to facilitate the precipitation and output of mineralization products.

[0043] In this invention, the first mineralization reaction tank 11 and the second mineralization reaction tank 12 have different tank structures.

[0044] In this invention, both the first mineralization reaction vessel 11 and the second mineralization reaction vessel 12 are made of corrosion-resistant and high-temperature-resistant materials, such as 316L stainless steel, to adapt to the acid and alkaline environment of the mineralization reaction.

[0045] In one embodiment, the top of the first mineralization reaction tank 11 is provided with a sealing cover, which is connected by sealing bolts to prevent the volatilization of the mineralizing agent and the splashing of the slurry inside; and / or the top of the second mineralization reaction tank 12 is provided with a sealing cover, which is connected by sealing bolts to prevent the volatilization of the mineralizing agent and the splashing of the slurry inside.

[0046] In one embodiment, a first temperature jacket is provided on the side wall of the first mineralization reaction tank 11 to regulate the reaction temperature inside the first mineralization reaction tank 11; a second temperature jacket is provided on the side wall of the second mineralization reaction tank 12 to regulate the reaction temperature inside the second mineralization reaction tank 12, thereby achieving gradient regulation of the two-stage reaction temperature and ensuring the efficiency of the mineralization reaction.

[0047] In one embodiment, the heating method for the first temperature jacket and the second temperature jacket includes heating from a low-grade waste heat system (such as a low-grade waste heat system of a power plant, utilizing its waste heat of 80~100 ℃) and / or electric heating. When electric heating is used, the electric heating power is 5~8 kW, such as 5 kW, 6 kW, 7 kW and 8 kW, and any value and range within this range.

[0048] In one embodiment, the intelligent monitoring and control component 31 is also signal-connected to the first temperature jacket and the second temperature jacket respectively, and adjusts the heating temperature of the first temperature jacket and the second temperature jacket, thereby controlling the reaction temperature in the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0049] Those skilled in the art will understand that the intelligent monitoring and control component 31 is also signal-connected to the first temperature jacket and the second temperature jacket respectively, meaning that the intelligent monitoring and control component 31 is connected to the first heating switch signal on the first temperature jacket and the intelligent monitoring and control component 31 is connected to the second heating switch signal on the second temperature jacket.

[0050] In a preferred embodiment, the reaction temperature in the first mineralization reaction tank 11 is greater than the reaction temperature in the second mineralization reaction tank 12, forming a temperature gradient, thereby improving the efficiency of the mineralization reaction and achieving energy saving and consumption reduction; preferably, the reaction temperature in the first mineralization reaction tank 11 is 60~70 ℃, such as 60 ℃, 65 ℃ and 70 ℃, and any value and range within this range; the reaction temperature in the second mineralization reaction tank 12 is 40~50 ℃, such as 40 ℃, 45 ℃ and 50 ℃, and any value and range within this range.

[0051] In one embodiment, a first stirring paddle is provided inside the first mineralization reaction tank 11. Preferably, the blades of the first stirring paddle are of an anchor-type or a paddle-type structure. The structural characteristics of the anchor-type and paddle-type structures make them particularly suitable for the arc-shaped bottom structure of the first mineralization reaction tank 11 and the slurry state with a large amount of mineralizing agent, which helps to achieve uniform stirring. When the first stirring paddle is of an anchor-type structure, its diameter is 800~1000 mm, such as 800 mm, 850 mm, 900 mm, 950 mm and 1000 mm, and any value and range within this range. When the first stirring paddle is of an anchor-type structure, the stirring speed is 300~500 r / min, such as 300 r / min, 350 r / min, 400 r / min, 450 r / min and 500 r / min. The speed of the stirring blade, including any value and range within that range, helps to uniformly mix the slurry and the added mineralizing agent in the first mineralization reaction tank 11, achieving a preliminary mineralization reaction and adapting to the preliminary ion conversion of the effluent from the pretreatment water system of the gypsum processing system. When the first stirring blade is a paddle structure, the stirring speed is 280~520 r / min, such as 280 r / min, 350 r / min, 400 r / min, 450 r / min and 520 r / min, including any value and range within that range, which helps to uniformly mix the slurry and the added mineralizing agent in the first mineralization reaction tank 11, achieving a preliminary mineralization reaction and adapting to the preliminary ion conversion of the effluent from the pretreatment water system of the gypsum processing system. The second mineralization reaction tank 12 is equipped with a second stirring impeller. Preferably, the impeller blades are of a propeller type or a turbine type. The propeller and turbine types are particularly suitable for the conical bottom structure of the second mineralization reaction tank 12 and the slurry state with a relatively small amount of mineralizing agent, which helps to achieve deep stirring and mineralization reaction of the slurry. The diameter of the second stirring impeller is 600~800 mm, such as 600 mm, 650 mm, 700 mm, 750 mm and 800 mm, and any value and range within this range. When the second stirring impeller is of a propeller type, the stirring speed is 800~1000 r / min, such as 800 r / min, 850 r / min, 900 r / min, 950 r / min and 1000 r / min, and any value and range within this range, which helps to achieve deep stirring and mineralization reaction of the slurry in the second mineralization reaction tank 12. When the second stirring impeller is of a turbine type, the stirring speed is 780~1050 r / min. r / min, such as 780 r / min, 850 r / min, 900 r / min, 950 r / min, 1000 r / min and 1050 r / min, and any value and range within this range, helps to achieve deep stirring and mineralization reaction of the slurry in the second mineralization reaction tank 12.

[0052] In one embodiment, the volume of the first mineralization reaction tank 11 is greater than the volume of the second mineralization reaction tank 12; preferably, the volume of the first mineralization reaction tank 11 is 8~12 m³. 3 For example, 8 m 3 9 m 3 10 m 3 11 m 3 and 12 m 3 And any value and range within that range; the volume of the second mineralization reaction vessel 12 is 6~8 m³. 3 For example, 6 m 3 7 m 3 and 8 m 3 And any value within that range and the range of values.

[0053] In one embodiment, the pH in the first mineralization reaction tank 11 is greater than the pH in the second mineralization reaction tank 12, forming a pH gradient to adapt to the mineralization reaction requirements at different stages; preferably, the pH in the first mineralization reaction tank 11 is 8.0~8.5, such as 8.0, 8.1, 8.2, 8.3, 8.4 and 8.5, and any value and range within this range; the pH in the second mineralization reaction tank 12 is 7.0~7.5, such as 7.0, 7.1, 7.2, 7.3, 7.4 and 7.5, and any value and range within this range.

[0054] In one embodiment, the amount of mineralizing agent added in the first mineralization reaction tank 11 is 5~8 wt%, such as 5wt%, 6wt%, 7wt%, and 8wt%, or any value and range within that range; the amount of mineralizing agent added in the second mineralization reaction tank 12 is 3~5 wt%, such as 3wt%, 3.5wt%, 4wt%, 4.5wt%, and 5wt%, or any value and range within that range.

[0055] In this invention, the first mineralization reaction tank 11 can ensure uniform mixing of slurry and mineralizing agent to achieve preliminary mineralization reaction and adapt to the preliminary ion conversion of purified slurry after pretreatment; the second mineralization reaction tank 12 can achieve deep stirring and mineralization reaction of slurry; the reaction parameters of the second mineralization reaction tank 12 and the reaction parameters of the first mineralization reaction tank 11 form a gradient difference, which is the core structure for achieving gradient mineralization, ensuring complete ion conversion and improved product purity.

[0056] In one embodiment, the reaction time of the primary mineralization reaction in the first mineralization reaction tank 11 is 20-30 min, such as 20 min, 25 min, 30 min, and any value and range within this range; the reaction time of the secondary mineralization reaction in the second mineralization reaction tank 12 is 15-20 min, such as 15 min, 17 min, and 20 min, and any value and range within this range.

[0057] In one embodiment, the mineralization reaction unit further includes a series conveying assembly, which includes a series conveying pipe 13, a conveying pump 14, and a flow regulating valve 15. The inlet end of the series conveying pipe 13 is connected to the bottom outlet of the first mineralization reaction tank 11, and the outlet end is connected to the top inlet of the second mineralization reaction tank 12. The conveying pump 14 and the flow regulating valve 15 are sequentially arranged on the series conveying pipe 13 according to the material flow direction, for connecting the first mineralization reaction tank 11 and the second mineralization reaction tank 12 in series within the mineralization reaction unit. Preferably, the diameter of the series conveying pipe 13 is 80~120 mm, such as 80 mm, 90 mm, 100 mm, 110 mm, and 120 mm, and any value or range within this range. Preferably, the conveying pump 14 is a variable frequency centrifugal pump, and its flow rate is preferably 10~15 m³ / s. 3 Adjustable within / h, for example, 10 m 3 / h、11 m 3 / h、12 m 3 / h、13 m 3 / h、14 m 3 / h and 15 m 3 / h and any value and range within that range help ensure smooth slurry delivery.

[0058] In one embodiment, the series conveying pipe 13 is made of corrosion-resistant rubber to avoid slurry corrosion.

[0059] In a preferred embodiment, a flow meter 16 is also provided on the series conveying pipeline 13. The flow meter 16 is located downstream of the flow regulating valve 15 and is used to detect the flow rate downstream of the flow regulating valve 15.

[0060] In a preferred embodiment, the intelligent monitoring and control component 31 is also connected to the delivery pump 14, the flow regulating valve 15, and the flow meter 16 respectively, and controls the operation of the delivery pump 14 and the flow regulating valve 15 according to the flow signal received from the flow meter 16, such as the start and stop of the delivery pump 14, the start and stop of the flow regulating valve 15, and the opening degree, etc., so that the amount of slurry delivered to the second mineralization reaction tank 12 can be precisely adjusted according to the mineralization reaction process (first-stage mineralization reaction process) in the first mineralization reaction tank 11, so as to realize the coordinated connection of the two-stage reaction.

[0061] In one embodiment, the series conveying pipeline 13 is provided with a connection interface for connecting to the outlet of the pretreatment water system of the gypsum processing system, so as to realize continuous production from pretreatment to mineralization. The connection is only a pipeline connection and does not involve any structural improvement of the pretreatment slurry system of the gypsum processing system.

[0062] In one embodiment, the gradient control unit further includes a pH control subunit; The pH control subunit includes a first pH detector 111 and a second pH detector 121; The first pH detector 111 is installed on the side wall of the first mineralization reaction tank 11 and is used to detect the pH inside the first mineralization reaction tank 11. The second pH meter 121 is installed on the side wall of the second mineralization reaction tank 12 and is used to detect the pH inside the second mineralization reaction tank 12. The intelligent monitoring and control component 31 is also connected to the first pH detector 111 and the second pH detector 121 respectively, and controls the first metering feeder 24 according to the pH signal received from the first pH detector 111 and controls the second metering feeder 25 according to the pH signal received from the second pH detector 121, so as to adjust the amount of mineralizer fed by the first metering feeder 24 and the second metering feeder 25, thereby controlling the pH in the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0063] In one embodiment, the gradient control unit further includes a temperature control subunit; The temperature control subunit includes a first temperature detector 112 and a second temperature detector 122; The first temperature detector 112 is installed on the side wall of the first mineralization reaction vessel 11 and is used to detect the reaction temperature inside the first mineralization reaction vessel 11. The second temperature detector 122 is installed on the side wall of the second mineralization reaction vessel 12 and is used to detect the reaction temperature inside the second mineralization reaction vessel 12. The intelligent monitoring and control component 31 is also connected to the first temperature detector 112 and the second temperature detector 122 respectively, and controls the first temperature jacket according to the temperature signal received from the first temperature detector 112 and controls the second temperature jacket according to the temperature signal received from the second temperature detector 122, so as to adjust the heating temperature of the first temperature jacket and the second temperature jacket, thereby controlling the reaction temperature in the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0064] In one embodiment, the first pH meter 111 and the first temperature meter 112 are installed inside the first mineralization reaction tank 11, and extend into the slurry to a depth of 100-150 mm, such as 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, and 150 mm, or any value and range within this range, for real-time monitoring of the reaction parameters inside the first mineralization reaction tank 11; the second pH meter 121 and the second temperature meter 122 are installed inside the second mineralization reaction tank 12, and extend into the slurry to a depth of 100-150 mm, such as 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, and 150 mm, or any value and range within this range, for real-time monitoring of the reaction parameters inside the second mineralization reaction tank 12.

[0065] In one embodiment, a first level gauge 113 is provided on the side wall of the first mineralization reaction tank 11 for detecting the liquid level inside the first mineralization reaction tank 11; preferably, the intelligent monitoring and control component 31 is also signal-connected to the first level gauge 113 and controls the slurry inlet valve of the first mineralization reaction tank 11 according to the received liquid level signal from the first level gauge 113, so as to adjust the slurry inlet of the first mineralization reaction tank 11; and / or, A second level gauge 123 is provided on the side wall of the second mineralization reaction tank 12 for detecting the liquid level inside the second mineralization reaction tank 12; preferably, the intelligent monitoring and control component 31 is also connected to the second level gauge 123 for signal connection, and controls the delivery pump 14 and the flow regulating valve 15 according to the liquid level signal received from the second level gauge 123, so as to regulate the slurry feeding situation of the second mineralization reaction tank 12.

[0066] In one embodiment, the mineralization reaction device further includes a slurry circulation component, which includes a circulation pipe 51, a circulation pump 52, and a one-way valve 53. The slurry inlet of the circulation pipe 51 is connected to the clear liquid outlet of the solid-liquid separation unit, and the slurry outlet is connected to the slurry inlet of the first mineralization reaction tank 11, forming a closed-loop circulation. This circulation circulates the clear liquid from the solid-liquid separation unit to the first mineralization reaction tank 11, allowing the clear liquid from the solid-liquid separation unit to be circulated back to the first mineralization reaction tank 11 before complete reaction, thus improving the utilization rate of the slurry. The circulation pump 52 and the one-way valve 53 are respectively installed on the circulation pipe 51 to provide circulation power and prevent slurry backflow, ensuring stable operation of the slurry circulation component and avoiding slurry waste.

[0067] In a preferred embodiment, a turbidity detector 44 is installed on the clear liquid output pipe of the solid-liquid separation unit to detect the turbidity of the clear liquid from the solid-liquid separation unit, thereby determining whether the reaction is complete based on the turbidity of the clear liquid, so that if the reaction is not complete, it can be recycled to the first mineralization reaction tank 11 for another mineralization reaction.

[0068] In a preferred embodiment, the intelligent monitoring and control component 31 is also connected to the circulation pump 52, the one-way valve 53, and the turbidity detector 44 respectively, and controls the circulation pump 52 and the one-way valve 53 according to the turbidity signal received from the turbidity detector 44, so that the clear liquid in the solid-liquid separation unit is discharged when the turbidity is ≤ 15 NTU, otherwise it is circulated to the first mineralization reaction tank 11, thereby realizing intelligent control of the slurry circulation component.

[0069] In one embodiment, the solid-liquid separation unit includes a graded filter 41, the inlet end of which is connected to the outlet of the mineralization reaction unit for graded filtration of the discharge (slurry containing mineralization products) from the mineralization reaction unit, with the filtrate being output as clear liquid and the mineralization products being output with the turbid liquid.

[0070] In one embodiment, the graded filter 41 has a double-layer filtration structure; preferably, the pore size of the upper filter is 8~12 μm, such as 8 μm, 9 μm, 10 μm, 11 μm and 12 μm and any value and range within this range, which traps large particles of mineralized products; the pore size of the lower filter is 4~6 μm, such as 4 μm, 5 μm and 6 μm and any value and range within this range, thereby trapping small particles of mineralized products, thus enabling the graded separation and purification of mineralized products, ensuring that the product purity is ≥97%.

[0071] In one embodiment, the graded filter 41 is a centrifugal grader, and the first-stage separation precision is 5~10μm, such as 5 μm, 6 μm, 7 μm, 8 μm, 9 μm and 10 μm and any value and range within this range, thereby retaining large particles of mineralized products; the second-stage separation precision is ≤5μm, such as 5 μm, 4 μm, 3 μm and any value and range within this range, thereby retaining small particles of mineralized products, thus enabling the graded separation and purification of mineralized products, ensuring product purity ≥97%.

[0072] In a preferred embodiment, the solid-liquid separation unit further includes a sedimentation tank 42 and a product collection tank 43. The feed end of the sedimentation tank 42 is connected to the turbid liquid outlet of the graded filter 41. The sedimentation tank 42 and the product collection tank 43 are arranged sequentially according to the material flow direction to precipitate and collect the turbid liquid from the graded filter 41 in sequence.

[0073] In this invention, the effluent from the mineralization reaction unit enters the graded filter 41 for two-stage filtration, which separates and retains the mineralized products. The clear liquid passes through the filter screen and is output through the clear liquid outlet, while the turbid liquid (containing the retained mineralized products) is discharged from the turbid liquid outlet and enters the sedimentation tank 42 for sedimentation and concentration (e.g., settling or slow flow). The solid particles (mineralized products) settle to the bottom under gravity. The mineralized product slurry concentrated at the bottom enters the product collection tank 43 for temporary storage, which facilitates subsequent deslurrying, drying, or direct utilization / disposal.

[0074] In a preferred embodiment, the sedimentation tank 42 includes a first sedimentation tank and a second sedimentation tank. The first sedimentation tank is connected to the outlet of the turbid liquid filtered in the first stage of the graded filter 41, and the second sedimentation tank is connected to the outlet of the turbid liquid filtered in the second stage of the graded filter 41. The sedimentation tank is used to settle the coarse mineralized products (large particles) after the first stage filtration and the fine mineralized products (small particles) after the second stage filtration in the graded filter 41, so as to realize the graded sedimentation and purification of mineralized products.

[0075] In a preferred embodiment, the product collection tank 43 includes a first product collection tank and a second product collection tank, wherein the first product collection tank is connected to the bottom outlet of the first sedimentation tank and the second product collection tank is connected to the bottom outlet of the second sedimentation tank, for collecting coarse mineralized products (large particles) and fine mineralized products (small particles) respectively, thereby realizing the graded purification of mineralized products and meeting the raw material requirements of different high value-added products, which is different from the existing single filtration structure.

[0076] The present invention also provides an operating method for a mineralization reaction device based on two-stage series gradient mineralization, wherein the operating method uses the aforementioned mineralization reaction device.

[0077] In one implementation, the operating method includes: Two-stage gradient mineralization: The effluent from the pretreatment water system of the gypsum processing system is fed as slurry to the mineralization reaction unit for graded mineralization treatment; wherein... First, it enters the first mineralization reaction tank 11 and undergoes a primary mineralization reaction with the mineralizing agent added through the mineralizing agent storage bin 21, the first addition pipe 22, and the first metering feeder 24 in the mineralization addition subunit, thereby removing the Ca from the slurry. 2+ Initially converted into mineral products, the gypsum in the slurry is converted into SO4.2- During the preferred period, the reaction temperature in the first mineralization reaction tank 11 is controlled at 60~70 ℃, the pH value is 8.0~8.5, the amount of mineralizer added is 5~8 wt% of the mass of the slurry inside, the stirring speed is 300~500 r / min, and the reaction time is 20~30 min. Then, the slurry after primary mineralization reaction in the first mineralization reaction tank 11 is transferred to the second mineralization reaction tank 12, with the flow rate controlled at 10~15 m³ / s. 3 / h, and undergoes a deep mineralization reaction with the mineralizer added via the mineralizer storage bin 21, the second addition pipe 23, and the second metering feeder 25 in the mineralizer addition subunit, ensuring ionic Ca 2+ SO4 2- Complete transformation to form a gradient mineralization effect; preferably, the reaction temperature in the second mineralization reaction tank 12 is controlled at 40~50 ℃, the pH value is 7.0~7.5, the amount of mineralizer added is 3~5 wt% of the mass of the slurry, the stirring speed is 800~1000 r / min, and the reaction time is 15~20 min to achieve deep mineralization reaction of the slurry; Staged solid-liquid separation and slurry circulation: The slurry after reaction in the second mineralization reaction tank 12 is sent to the solid-liquid separation unit for solid-liquid separation, SO4 2- The slurry is output along with the clarified liquid and calcium carbonate as a mineralization product. First, the slurry after reaction in the second mineralization reaction tank 12 is sent to the graded filter 41 and sedimentation tank 42 in the solid-liquid separation unit for graded filtration and sedimentation. The separated coarse product (particle size 5~10μm) and fine product (particle size ≤5μm) enter the corresponding product collection tank 43 for graded purification. The filtered clarified liquid (filtrate, i.e., the incompletely reacted slurry) is circulated back to the first mineralization reaction tank 11 through the slurry circulation assembly (preferably through the circulation pipe 51 and the circulation pump 52) for renewed mineralization reaction, improving slurry utilization and achieving closed-loop circulation. Intelligent control and continuous operation: Throughout the mineralization process, the gradient control unit and the intelligent monitoring and control unit monitor the temperature, pH value and flow rate of each pipeline of the first mineralization reaction tank 11 and the second mineralization reaction tank 12 in real time, and automatically adjust the relevant parameters according to the detected signals. The gradient mineralization effect is stable, the mineralization reaction conversion rate is ≥98%, and the purity of the mineralization product is ≥97%. The equipment can operate continuously and is suitable for large-scale industrial production.

[0078] This invention relates to a mineralization reaction device and its operation method based on a two-stage series gradient mineralization process. Through the coordinated operation of each unit and gradient control, it enables gradient mineralization, graded purification, and continuous production of effluent from the pretreatment water system of a gypsum processing system. Specifically, (1) To solve the technical problems of low mineralization efficiency and insufficient reaction of existing equipment, a two-stage series gradient mineralization structure is designed to realize the gradient progressive mineralization of the pretreated purified slurry, ensure the mineralization reaction conversion rate ≥98%, improve the ion conversion efficiency, and overcome the inherent defects of a single reaction tank.

[0079] (2) To solve the technical problems of uneven product purity and poor classification effect of existing equipment, a gradient control unit and a solid-liquid separation unit are added to realize the classification and purification of mineral products, ensuring that the purity of mineral products is ≥97% and meeting the raw material requirements of high value-added products.

[0080] (3) To solve the technical problems of inaccurate parameter control and poor adaptability of existing equipment, design an intelligent monitoring and control unit to realize real-time monitoring and automatic control of key parameters such as reaction temperature, pH value and mineralizer addition amount, adapt to slurry with different components and concentrations after pretreatment, and improve equipment adaptability.

[0081] (4) To solve the technical problems of low slurry utilization and high energy consumption of existing equipment, a closed-loop slurry circulation component is designed to realize the recycling of incompletely reacted slurry, reduce slurry waste, and optimize the energy consumption distribution of the first mineralization reaction tank 11 and the second mineralization reaction tank 12 to achieve energy saving and consumption reduction, with energy consumption reduced by more than 30% compared with existing equipment.

[0082] (5) To solve the technical problems of existing equipment being unable to achieve continuous production and poor connection, by connecting the slurry inlet of the first mineralization reaction tank 11 to the pretreatment water system outlet of the gypsum processing system, the pretreatment water system of the gypsum processing system is precisely connected, thereby realizing continuous production of pretreatment-mineralization, simplifying the process flow, reducing labor costs, and adapting to large-scale industrial applications.

[0083] The present invention will be further illustrated by the following examples.

[0084] Example 1 (S1) A mineralization reaction device A1 based on two-stage tandem gradient mineralization, such as Figure 1 As shown, it includes a mineralization reaction unit, a gradient control unit, a solid-liquid separation unit, and an intelligent monitoring and control unit; wherein, The mineralization reaction unit includes at least a first mineralization reaction tank 11 and a second mineralization reaction tank 12 connected in series. The slurry feed of the first mineralization reaction tank 11 is the effluent from the pretreatment water system of the gypsum processing system. The bottom slurry outlet of the first mineralization reaction tank 11 is connected to the top slurry inlet of the second mineralization reaction tank 12, which is used to perform graded mineralization treatment on the effluent from the pretreatment water system of the gypsum processing system, which is used as slurry. The gradient control unit includes a mineralization addition subunit, which includes a mineralization agent storage tank 21, a first addition pipe 22, a second addition pipe 23, a first metering feeder 24, and a second metering feeder 25. The outlet of the mineralization agent storage tank 21 is connected to the dosing port of the first mineralization reaction tank 11 via the first addition pipe 22 and to the dosing port of the second mineralization reaction tank 12 via the second addition pipe 23. The first metering feeder 24 is mounted on the first addition pipe 22, and the second metering feeder 25 is mounted on the second addition pipe 23. These subunits are used to gradient control the amount of mineralization agent added from the mineralization agent storage tank 21 to the first mineralization reaction tank 11 and the second mineralization reaction tank 12. The intelligent monitoring and control unit includes an intelligent monitoring and control component 31, which is connected to the stirring motors of the first mineralization reaction tank 11 and the second mineralization reaction tank 12, the first metering feeder 24 and the second metering feeder 25 respectively, and is used to control the stirring speed in the first mineralization reaction tank 11 and the second mineralization reaction tank 12, as well as the amount of mineralizing agent added in the first mineralization reaction tank 11 and the second mineralization reaction tank 12. The slurry inlet of the solid-liquid separation unit is connected to the discharge outlet of the mineralization reaction unit, and is used to perform solid-liquid separation on the discharge from the mineralization reaction unit to output clear liquid and mineralization products.

[0085] Example 2 (S2) A mineralization reaction device A2 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The first mineralization reaction tank 11 is provided with a first temperature jacket on its side wall for regulating the reaction temperature inside the first mineralization reaction tank 11; the second mineralization reaction tank 12 is provided with a second temperature jacket on its side wall for regulating the reaction temperature inside the second mineralization reaction tank 12; the intelligent monitoring and control component 31 is also connected to the first temperature jacket and the second temperature jacket respectively, and adjusts the heating temperature of the first temperature jacket and the second temperature jacket to control the reaction temperature inside the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0086] Example 3 (S3) A mineralization reaction device A3 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The mineralization reaction unit further includes a series conveying assembly, which includes a series conveying pipeline 13, a conveying pump 14, and a flow regulating valve 15; wherein, the inlet end of the series conveying pipeline 13 is connected to the bottom outlet of the first mineralization reaction tank 11, and the outlet end is connected to the top inlet of the second mineralization reaction tank 12; the conveying pump 14 and the flow regulating valve 15 are arranged sequentially on the series conveying pipeline 13 in the direction of material flow. A flow meter 16 is also installed on the series conveying pipeline 13. The flow meter 16 is located downstream of the flow regulating valve 15 and is used to detect the flow rate downstream of the flow regulating valve 15. The intelligent monitoring and control component 31 is also connected to the delivery pump 14, the flow regulating valve 15 and the flow meter 16 respectively, and controls the operation of the delivery pump 14 and the flow regulating valve 15 according to the flow signal received from the flow meter 16.

[0087] Example 4 (S4) A mineralization reaction device A4 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The gradient control unit further includes a pH control subunit; The pH control subunit includes a first pH detector 111 and a second pH detector 121; The first pH detector 111 is installed on the side wall of the first mineralization reaction tank 11 and is used to detect the pH inside the first mineralization reaction tank 11. The second pH meter 121 is installed on the side wall of the second mineralization reaction tank 12 and is used to detect the pH inside the second mineralization reaction tank 12. The intelligent monitoring and control component 31 is also connected to the first pH detector 111 and the second pH detector 121 respectively, and controls the first metering feeder 24 according to the pH signal received from the first pH detector 111 and controls the second metering feeder 25 according to the pH signal received from the second pH detector 121, so as to adjust the amount of mineralizer fed by the first metering feeder 24 and the second metering feeder 25, thereby controlling the pH in the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0088] Example 5 (S5) A mineralization reaction device A5 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The gradient control unit also includes a temperature control subunit; The temperature control subunit includes a first temperature detector 112 and a second temperature detector 122; The first temperature detector 112 is installed on the side wall of the first mineralization reaction vessel 11 and is used to detect the reaction temperature inside the first mineralization reaction vessel 11. The second temperature detector 122 is installed on the side wall of the second mineralization reaction vessel 12 and is used to detect the reaction temperature inside the second mineralization reaction vessel 12. The intelligent monitoring and control component 31 is also connected to the first temperature detector 112 and the second temperature detector 122 respectively, and controls the first temperature jacket according to the temperature signal received from the first temperature detector 112 and controls the second temperature jacket according to the temperature signal received from the second temperature detector 122, so as to adjust the heating temperature of the first temperature jacket and the second temperature jacket, thereby controlling the reaction temperature in the first mineralization reaction tank 11 and the second mineralization reaction tank 12.

[0089] Example 6 (S6) A mineralization reaction device A6 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The mineralization reaction device further includes a slurry circulation assembly, which includes a circulation pipe 51, a circulation pump 52, and a one-way valve 53; wherein, the slurry inlet end of the circulation pipe 51 is connected to the clear liquid outlet of the solid-liquid separation unit, and the slurry outlet end is connected to the slurry inlet of the first mineralization reaction tank 11; the circulation pump 52 and the one-way valve 53 are respectively installed on the circulation pipe 51; A turbidity detector 44 is installed on the clear liquid output pipe of the solid-liquid separation unit to detect the turbidity of the clear liquid from the solid-liquid separation unit. The intelligent monitoring and control component 31 is also connected to the circulating pump 52, the one-way valve 53 and the turbidity detector 44 respectively, and controls the circulating pump 52 and the one-way valve 53 according to the turbidity signal received from the turbidity detector 44, so that the clear liquid in the solid-liquid separation unit is discharged when the turbidity is ≤ 15 NTU, otherwise it is circulated to the first mineralization reaction tank 11.

[0090] Example 7 (S7) A mineralization reaction device A7 based on two-stage cascade gradient mineralization differs from Example 1 only in the following ways: The solid-liquid separation unit includes a graded filter 41, the inlet end of which is connected to the outlet of the mineralization reaction unit for graded filtration of the output of the mineralization reaction unit. The filtrate is output as clear liquid, and the mineralization product is output with the turbid liquid. The solid-liquid separation unit also includes a sedimentation tank 42 and a product collection tank 43. The feed end of the sedimentation tank 42 is connected to the turbid liquid outlet of the graded filter 41. The sedimentation tank 42 and the product collection tank 43 are arranged in sequence according to the material flow direction, and are used to precipitate and collect the turbid liquid from the graded filter 41 in sequence.

[0091] Example 8 (S8) A mineralization reaction device A8 based on two-stage tandem gradient mineralization differs from Example 7 only in the following ways: The sedimentation tank 42 includes a first sedimentation tank and a second sedimentation tank. The first sedimentation tank is connected to the outlet of the turbid liquid from the first stage filtration in the graded filter 41, and the second sedimentation tank is connected to the outlet of the turbid liquid from the second stage filtration in the graded filter 41. The sedimentation tank is used to settle the coarse mineralized products (large particles) after the first stage filtration and the fine mineralized products (small particles) after the second stage filtration in the graded filter 41, so as to realize the graded sedimentation and purification of mineralized products. The product collection tank 43 includes a first product collection tank and a second product collection tank. The first product collection tank is connected to the bottom outlet of the first sedimentation tank, and the second product collection tank is connected to the bottom outlet of the second sedimentation tank. It is used to collect coarse mineral products (large particles) and fine mineral products (small particles) respectively, so as to realize the graded purification of mineral products and meet the raw material requirements of different high value-added products, which is different from the existing single filtration structure.

[0092] Application Examples 1-8 (Y1-8) An operating method for a mineralization reaction device A1 based on the aforementioned two-stage tandem gradient mineralization, wherein, The reaction temperature in the first mineralization reaction vessel 11 is 65 ℃, and the reaction temperature in the second mineralization reaction vessel 12 is 45 ℃. The pH in the first mineralization reaction tank 11 is 8.2, and the pH in the second mineralization reaction tank 12 is 7.2. The amount of mineralizing agent added in the first mineralization reaction tank 11 is 6.5 wt%, and the amount of mineralizing agent added in the second mineralization reaction tank 12 is 4 wt%. The reaction time for the primary mineralization reaction in the first mineralization reaction tank 11 is 25 min, and the reaction time for the secondary mineralization reaction in the second mineralization reaction tank 12 is 18 min. The stirring speed of the first mineralization reaction vessel 11 is 400 r / min, and the stirring speed of the second mineralization reaction vessel 12 is 900 r / min; The mineralizing agent is ammonium bicarbonate.

[0093] Application Examples 9-16 (Y9-16) The operation method of the mineralization reaction device A1 based on the aforementioned two-stage tandem gradient mineralization differs from that of Example 1 only in the following aspects: The reaction temperature in the first mineralization reaction vessel 11 is 60 ℃, and the reaction temperature in the second mineralization reaction vessel 12 is 40 ℃; The pH in the first mineralization reaction tank 11 is 8.0, and the pH in the second mineralization reaction tank 12 is 7.0; The amount of mineralizing agent added in the first mineralization reaction tank 11 is 5 wt%, and the amount of mineralizing agent added in the second mineralization reaction tank 12 is 3 wt%. The reaction time for the primary mineralization reaction in the first mineralization reaction tank 11 is 20 min, and the reaction time for the secondary mineralization reaction in the second mineralization reaction tank 12 is 15 min. The stirring speed of the first mineralization reaction vessel 11 is 300 r / min, and the stirring speed of the second mineralization reaction vessel 12 is 800 r / min; The mineralizing agent is sodium carbonate.

[0094] Application Examples 17-24 (Y17-24) The operation method of the mineralization reaction device A1 based on the aforementioned two-stage tandem gradient mineralization differs from that of Example 1 only in the following aspects: The reaction temperature in the first mineralization reaction vessel 11 is 70 ℃, and the reaction temperature in the second mineralization reaction vessel 12 is 50 ℃; The pH in the first mineralization reaction tank 11 is 8.5, and the pH in the second mineralization reaction tank 12 is 7.5; the dosage of the mineralizing agent in the first mineralization reaction tank 11 is 8 wt%, and the dosage of the mineralizing agent in the second mineralization reaction tank 12 is 5 wt%. The reaction time for the primary mineralization reaction in the first mineralization reaction tank 11 is 30 min, and the reaction time for the secondary mineralization reaction in the second mineralization reaction tank 12 is 20 min. The stirring speed of the first mineralization reaction vessel 11 is 500 r / min, and the stirring speed of the second mineralization reaction vessel 12 is 1000 r / min; The mineralizing agent is sodium bicarbonate.

[0095] In the application examples 1-24 of this invention, the gradient mineralization effect is stable throughout the entire mineralization process; the mineralization reaction conversion rate is ≥98%, which is more than 40% higher than that of the existing process when the mineralization reaction unit uses a single mineralization reaction tank; the purity of the mineralization product is ≥97%, which is more than 35% higher than that of the existing process when the mineralization reaction unit uses a single mineralization reaction tank; the equipment can operate continuously and is suitable for large-scale industrial production; and the energy consumption of the equipment is reduced by more than 30% compared with the existing mineralization equipment.

[0096] The above embodiments / examples are only used to illustrate the content of the present invention and are not limited thereto. Any simple changes made to the present invention based on the concept of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A mineralization reaction device based on two-stage tandem gradient mineralization, characterized in that, The mineralization reaction device includes a mineralization reaction unit, a gradient control unit, a solid-liquid separation unit, and an intelligent monitoring and control unit; wherein... The mineralization reaction unit includes at least a first mineralization reaction tank (11) and a second mineralization reaction tank (12) connected in series. The slurry feed of the first mineralization reaction tank (11) is the effluent from the pretreatment water system of the gypsum processing system. The bottom slurry outlet of the first mineralization reaction tank (11) is connected to the top slurry inlet of the second mineralization reaction tank (12) for graded mineralization treatment of the effluent from the pretreatment water system of the gypsum processing system, which is the slurry. The gradient control unit includes a mineralization addition subunit, which includes a mineralizer storage tank (21), a first addition pipe (22), a second addition pipe (23), a first metering feeder (24), and a second metering feeder (25). The outlet of the mineralizer storage tank (21) is connected to the dosing port of the first mineralization reaction tank (11) via the first addition pipe (22), and to the dosing port of the second mineralization reaction tank (12) via the second addition pipe (23). The first metering feeder (24) is installed on the first addition pipe (22), and the second metering feeder (25) is installed on the second addition pipe (23). The feeder is used to gradient control the amount of mineralizer added from the mineralizer storage tank (21) to the first mineralization reaction tank (11) and the second mineralization reaction tank (12), so that the amount of mineralizer added in the first mineralization reaction tank (11) is greater than the amount of mineralizer added in the second mineralization reaction tank (12), thus forming a mineralizer addition gradient. The intelligent monitoring and control unit includes an intelligent monitoring and control component (31), which is connected to the stirring motor of the first mineralization reaction tank (11) and the second mineralization reaction tank (12), the first metering feeder (24) and the second metering feeder (25) respectively, and is used to control the stirring speed in the first mineralization reaction tank (11) and the second mineralization reaction tank (12), as well as the amount of mineralizing agent added in the first mineralization reaction tank (11) and the second mineralization reaction tank (12); The slurry inlet of the solid-liquid separation unit is connected to the discharge outlet of the mineralization reaction unit, and is used to perform solid-liquid separation on the discharge from the mineralization reaction unit to output clear liquid and mineralization products.

2. The mineralization reaction apparatus according to claim 1, characterized in that, The first mineralization reaction vessel (11) has a cylindrical body with an arc-shaped bottom; the second mineralization reaction vessel (12) has a cylindrical body with a conical bottom, preferably with a cone angle of 40~60°; and / or, A first temperature jacket is provided on the side wall of the first mineralization reaction tank (11) to regulate the reaction temperature inside the first mineralization reaction tank (11); a second temperature jacket is provided on the side wall of the second mineralization reaction tank (12) to regulate the reaction temperature inside the second mineralization reaction tank (12); preferably, the intelligent monitoring and control component (31) is also signal-connected to the first temperature jacket and the second temperature jacket respectively, and adjusts the heating temperature of the first temperature jacket and the second temperature jacket to control the reaction temperature inside the first mineralization reaction tank (11) and the second mineralization reaction tank (12); and / or, The reaction temperature in the first mineralization reaction tank (11) is greater than the reaction temperature in the second mineralization reaction tank (12), forming a temperature gradient; preferably, the reaction temperature in the first mineralization reaction tank (11) is 60~70 ℃ and the reaction temperature in the second mineralization reaction tank (12) is 40~50 ℃.

3. The mineralization reaction apparatus according to claim 1 or 2, characterized in that, The pH in the first mineralization reaction tank (11) is greater than the pH in the second mineralization reaction tank (12), forming a pH gradient; preferably, the pH in the first mineralization reaction tank (11) is 8.0~8.5 and the pH in the second mineralization reaction tank (12) is 7.0~7.5; and / or, The amount of mineralizing agent added in the first mineralization reaction tank (11) is 5~8 wt%, and the amount of mineralizing agent added in the second mineralization reaction tank (12) is 3~5 wt%; and / or, The reaction time for the primary mineralization reaction in the first mineralization reaction tank (11) is 20-30 min, and the reaction time for the secondary mineralization reaction in the second mineralization reaction tank (12) is 15-20 min.

4. The mineralization reaction apparatus according to any one of claims 1-3, characterized in that, The mineralization reaction unit also includes a series conveying assembly, which includes a series conveying pipe (13), a conveying pump (14), and a flow regulating valve (15); wherein, the inlet end of the series conveying pipe (13) is connected to the bottom outlet of the first mineralization reaction tank (11), and the outlet end is connected to the top inlet of the second mineralization reaction tank (12); the conveying pump (14) and the flow regulating valve (15) are arranged sequentially on the series conveying pipe (13) in the direction of material flow. Preferably, a flow meter (16) is also provided on the series conveying pipeline (13), and the flow meter (16) is located downstream of the flow regulating valve (15) for detecting the flow rate downstream of the flow regulating valve (15); Preferably, the intelligent monitoring and control component (31) is also connected to the delivery pump (14), the flow regulating valve (15) and the flow meter (16) respectively, and controls the operation of the delivery pump (14) and the flow regulating valve (15) according to the flow signal received from the flow meter (16).

5. The mineralization reaction apparatus according to any one of claims 1-4, characterized in that, The gradient control unit further includes a pH control subunit; The pH control subunit includes a first pH detector (111) and a second pH detector (121). The first pH detector (111) is installed on the side wall of the first mineralization reaction tank (11) and is used to detect the pH inside the first mineralization reaction tank (11); The second pH meter (121) is installed on the side wall of the second mineralization reaction tank (12) and is used to detect the pH inside the second mineralization reaction tank (12); The intelligent monitoring and control component (31) is also connected to the first pH detector (111) and the second pH detector (121) respectively, and controls the first metering feeder (24) according to the pH signal received from the first pH detector (111) and controls the second metering feeder (25) according to the pH signal received from the second pH detector (121) to adjust the amount of mineralizer fed by the first metering feeder (24) and the second metering feeder (25), thereby controlling the pH in the first mineralization reaction tank (11) and the second mineralization reaction tank (12).

6. The mineralization reaction apparatus according to any one of claims 1-5, characterized in that, The gradient control unit also includes a temperature control subunit; The temperature control subunit includes a first temperature detector (112) and a second temperature detector (122); The first temperature detector (112) is installed on the side wall of the first mineralization reaction tank (11) to detect the reaction temperature inside the first mineralization reaction tank (11); The second temperature detector (122) is installed on the side wall of the second mineralization reaction vessel (12) to detect the reaction temperature inside the second mineralization reaction vessel (12); The intelligent monitoring and control component (31) is also connected to the first temperature detector (112) and the second temperature detector (122) respectively, and controls the first temperature jacket according to the temperature signal received from the first temperature detector (112) and controls the second temperature jacket according to the temperature signal received from the second temperature detector (122) to adjust the heating temperature of the first temperature jacket and the second temperature jacket, thereby controlling the reaction temperature in the first mineralization reaction tank (11) and the second mineralization reaction tank (12).

7. The mineralization reaction apparatus according to any one of claims 1-6, characterized in that, The mineralization reaction device further includes a slurry circulation assembly, which includes a circulation pipe (51), a circulation pump (52), and a one-way valve (53); wherein, the slurry inlet end of the circulation pipe (51) is connected to the clear liquid outlet of the solid-liquid separation unit, and the slurry outlet end is connected to the slurry inlet of the first mineralization reaction tank (11); the circulation pump (52) and the one-way valve (53) are respectively installed on the circulation pipe (51); Preferably, a turbidity detector (44) is installed on the clear liquid output pipe of the solid-liquid separation unit to detect the turbidity of the clear liquid from the solid-liquid separation unit; Preferably, the intelligent monitoring and control component (31) is also connected to the circulating pump (52), the one-way valve (53) and the turbidity detector (44) respectively, and controls the circulating pump (52) and the one-way valve (53) according to the turbidity signal received from the turbidity detector (44) so ​​that the clear liquid in the solid-liquid separation unit is discharged when the turbidity is ≤ 15 NTU, otherwise it is circulated to the first mineralization reaction tank (11).

8. The mineralization reaction apparatus according to any one of claims 1-7, characterized in that, The solid-liquid separation unit includes a graded filter (41), the inlet end of which is connected to the outlet of the mineralization reaction unit, for graded filtration of the output of the mineralization reaction unit, with the filtrate being output as clear liquid and the mineralization product being output with the turbid liquid. Preferably, the solid-liquid separation unit further includes a sedimentation tank (42) and a product collection tank (43). The feed end of the sedimentation tank (42) is connected to the turbid liquid outlet of the graded filter (41). The sedimentation tank (42) and the product collection tank (43) are arranged in sequence according to the material flow direction for sedimentation and collection of the turbid liquid from the graded filter (41) in sequence.

9. The mineralization reaction apparatus according to any one of claims 1-8, characterized in that, The mineralizing agent includes any one or more combinations of ammonium bicarbonate, sodium carbonate, and sodium bicarbonate.

10. An operation method for a mineralization reaction device based on two-stage series gradient mineralization, characterized in that, The operation method is carried out using the mineralization reaction apparatus described in any one of claims 1-9.

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