Process and device for secondary recovery of vanadium from calcium roasting vanadium extraction waste liquid

Abstract

The invention discloses a process and device for secondary recovery of vanadium from calcium roasting vanadium extraction waste liquid, and belongs to the technical field of hydrometallurgy. The invention discloses a process for secondary recovery of vanadium from calcium roasting vanadium extraction waste liquid. The process comprises the following steps: step 1, preparing calcium roasting-acid leaching-ammonium salt vanadium precipitation waste liquid; 2, a vanadium precipitation agent is added; step 3, stirring and precipitating; step 4, separating a vanadium material from tailings; and 5, filtering and drying the vanadium material to obtain a vanadium product. The tailings are used as production waste liquid and are repeatedly used; the magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate compound suspension is used for replacing ammonium salt to serve as a catalytic induction precipitator of vanadium, ammonium polyvanadate particles are added as an induction core, rapid growth of ammonium polyvanadate is promoted, and the reaction time is shortened. Under the low-temperature condition, targeted vanadium precipitation is conducted, vanadium precipitation products are enriched in the center of a vortex through low-speed stirring in a reaction container and discharged in time, and high-purity ammonium polyvanadate products are obtained.

Description

Technical Field

[0001] The invention relates to the technical field of hydrometallurgy, and in particular to a process and a device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid. Background Art

[0002] Vanadium is an important strategic scarce resource in the world. It is widely distributed in the earth's crust, accounting for about 0.02% of the mass of the earth's crust, ranking 22nd in the metal content of the earth's crust. my country's vanadium ore resources mainly come in two forms, namely vanadium-titanium magnetite and vanadium-containing stone coal, which are mainly distributed in Panxi area of ​​Sichuan and Chengde area of ​​Hebei. About 20% of my country's vanadium production comes from stone coal, more than 70% comes from vanadium-titanium magnetite, and a small part comes from other vanadium extraction raw materials. Vanadium-titanium magnetite is smelted in a blast furnace, and vanadium is reduced into molten iron to obtain vanadium-containing molten iron; the obtained vanadium-containing molten iron is blown in a converter, and vanadium is oxidized into slag to obtain vanadium slag, which is the main raw material for subsequent vanadium extraction. The vanadium slag is then roasted, leached, precipitated and calcined to obtain the final product V2O5. Vanadium is further extracted from the residual liquid after precipitation, which is the secondary recovery of vanadium.

[0003] The sodium roasting-water leaching vanadium extraction process is very mature and can effectively extract vanadium in industrial production. However, it is also found in the production process that the process has certain limitations: 1) The calcium content in the vanadium slag must be strictly limited to less than 2.5% to avoid the formation of water-insoluble calcium vanadate, which reduces the recovery rate of vanadium; 2) When NaCl or Na2SO4 is used as a roasting additive, polluting gases such as Cl2 and SO2 will be generated, causing environmental pollution and corroding equipment; 3) There are also a large amount of sodium salts in the wastewater and vanadium extraction tailings. The vanadium extraction tailings cannot be recycled for blast furnace smelting of vanadium-titanium magnetite, but can only be piled up, causing land waste and pollution, and cannot be recycled; 4) Most sodium salts have a low melting point, and melting at high temperatures can easily cause furnace sticking and rotary kiln ringing, which greatly reduces the production capacity and life of the equipment. Compared with the sodium roasting method, the calcium roasting method has no corrosive gas emissions during the roasting process, the ringing phenomenon of the rotary kiln is reduced, and the restrictions on calcium, silicon and other components in the vanadium slag are reduced. It has a wider applicability and has gradually become the mainstream vanadium extraction production process. However, in the acid leaching process, in addition to V being leached into the leachate, a large number of impurity elements are also leached. Since the content of Al, Fe, K, and Ca in the original ore is much higher than that of V, the concentration of these elements in the leachate is also higher than that of V. In addition, the leachate is repeatedly circulated back to the leaching process, and impurity elements continue to accumulate. The content of vanadium in the waste liquid of calcium roasting-acid leaching-ammonium salt vanadium precipitation is much lower than that of impurity elements. The conventional process of vanadium extraction requires a large amount of reagents, and a large amount of impurity elements enter the vanadium precipitation product, resulting in poor product quality. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the prior art vanadium precipitation device and process are not economical to continue to recover vanadium, and to propose a process and device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid, comprising the following steps: Step 1: preparing the waste liquid of calcination roasting-acid leaching-ammonium salt precipitation of vanadium; Step 2: The temperature is controlled within the range of 5℃-15℃, and vanadium precipitation agent is added; Step 3: stirring and settling; Step 4: Separating vanadium materials and tailings; Step 5: The vanadium material is filtered and dried to obtain the vanadium product. The tailings are reused as production waste liquid.

[0006] In order to promote the rapid growth of ammonium polyvanadate, preferably, the vanadium precipitating agent is a composite suspension of magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate.

[0007] In order to further improve the reaction rate, the magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension has a Mg2+ concentration of 0.1-0.5 mol / L, an NH4+ concentration of 1-3 mol / L, a hydrogen peroxide concentration of 0.01-0.05 mol / L, and an ammonium polyvanadate concentration of 2-6 g / L.

[0008] Furthermore, the fineness of the ammonium polyvanadate is 10-20 μm.

[0009] Furthermore, the molar ratio of the amount of ammonium salt in the vanadium precipitation process to the amount of vanadium in the waste liquid of calcination roasting-acid leaching-ammonium salt vanadium precipitation is 2:1-5:1.

[0010] Preferably, the vanadium precipitation time is 10 min-20 min, and the stirring speed is 100-500 r / min.

[0011] A device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid comprises a multi-stage reaction vessel, wherein the multi-stage reaction vessels are sequentially connected through a tailing material discharge pipe, a vanadium liquid feeding pipe is fixedly arranged on the first-stage reaction vessel, a vanadium material discharge pipe is fixedly arranged on the bottom of the multi-stage reaction vessels, a vanadium precipitant feeding pipe is fixedly arranged on the multi-stage reaction vessels, and a stirring assembly is arranged in the multi-stage reaction vessels.

[0012] In order to facilitate the centralized collection of vanadium materials and tailings and reduce the output ports, centralized discharge is beneficial to reduce labor. Preferably, multiple groups of vanadium material discharge pipes are connected through a vanadium material discharge collection pipe, and the tailings discharge pipes of the last stage are connected through a tailings discharge collection pipe.

[0013] In order to facilitate stirring in the reaction container and accelerate the reaction rate, preferably, the stirring assembly includes multiple groups of stirring rods, and the multiple groups of stirring rods are rotatably arranged in the reaction container respectively. The multiple levels of reaction containers are all removably provided with top covers, and a stirring motor is fixedly arranged on the top cover. One end of the stirring rod is fixedly connected to the output end of the stirring motor, and a stirring blade is fixedly arranged on the stirring rod. The vanadium precipitant feeding pipe is fixedly arranged on the top cover.

[0014] In order to stir and mix the suspension and to subdivide it, the reaction effect with the calcification roasting-acid leaching-ammonium salt vanadium precipitation waste liquid can be improved. Furthermore, a receiving tray is fixedly arranged on the stirring rod, the output end of the vanadium precipitation agent feeding pipe is connected to the receiving tray, a through hole is opened on the receiving tray, and a stirring plate is fixedly arranged on the bottom of the top cover, and the stirring plate extends into the receiving tray.

[0015] Compared with the prior art, the present invention provides a process and device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid, which has the following beneficial effects: 1. This process for secondary recovery of vanadium from calcified roasting vanadium extraction waste liquid uses a magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension to replace ammonium salt as a catalytic induced precipitant for vanadium. Ammonium polyvanadate particles are added as "inducing nuclei" to promote the rapid growth of ammonium polyvanadate through catalytic induction, increase the vanadium precipitation rate in a targeted manner, and shorten the reaction time. Reacting under low temperature conditions reduces the formation of impurity precipitates, and a "vortex" is formed by low-speed stirring in the reaction vessel. The vanadium precipitation product is enriched in the center of the "vortex" and discharged in time, reducing the mixing of other harmful impurities during the vanadium precipitation process, so as to obtain a high-purity ammonium polyvanadate product, which can improve the economic benefits of vanadium smelters and make full use of waste resources; 2. The device for secondary recovery of vanadium from calcified roasting vanadium extraction waste liquid can strengthen recovery by setting up a multi-stage reaction vessel, significantly improve the vanadium precipitation rate, and can carry out continuous vanadium precipitation production operations to shorten the vanadium precipitation time and improve unit production efficiency; the reaction is carried out at room temperature, no heating equipment is required, energy consumption is reduced, safety risks are reduced, and the impurity content of the precipitated product can be significantly reduced, providing a raw material basis for the subsequent process to obtain high-purity vanadium pentoxide; 3. The device for secondary recovery of vanadium from calcined roasting vanadium extraction waste liquid has a receiving tray fixedly arranged on the stirring rod. When the vanadium precipitation agent is added into the reaction container through the vanadium precipitation agent feeding pipe, the vanadium precipitation agent suspension will fall into the receiving tray. At this time, since the stirring rod stirs with the stirring blade, the receiving tray can be rotated at the same time. During the rotation, the stirring plate can stir and collide the suspension in the receiving tray, which can not only stir and mix the suspension, but also subdivide it, so as to improve the reaction effect with the calcined roasting-acid leaching-ammonium salt vanadium precipitation waste liquid; 3. The device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid starts a stirring motor to rotate a stirring rod, and the stirring rod can stir the reaction container with a stirring blade to improve the reaction effect.

[0016] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention uses magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension to replace ammonium salt as a catalytic induced precipitant of vanadium, and ammonium polyvanadate particles are added as "inducing nuclei" to promote the rapid growth of ammonium polyvanadate, and through catalytic induction, the vanadium precipitation rate is targeted to be increased and the reaction time is shortened. The reaction is carried out under low temperature conditions to reduce the generation of impurities, and a "vortex" is formed by low-speed stirring in the reaction vessel. The vanadium precipitation product is enriched in the center of the "vortex" and discharged in time, reducing the mixing of other harmful impurities in the vanadium precipitation process, so as to obtain a high-purity ammonium polyvanadate product, which can improve the economic benefits of vanadium smelters and make full use of waste resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid proposed by the present invention; Figure 2 This is a front view of a device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid proposed by the present invention; Figure 3 This is a schematic structural diagram of a reaction vessel of a device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid proposed by the present invention; Figure 4 The present invention proposes a device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid Figure 3 Enlarged view of part A.

[0018] In the figure: 1. vanadium liquid feeding pipe; 2. stirring motor; 3. vanadium precipitant feeding pipe; 4. stirring rod; 5. stirring blade; 6. vanadium material discharge pipe; 7. tailing material discharge pipe; 8. reaction vessel; 9. vanadium material discharge collection pipe; 10. tailing material discharge collection pipe; 11. receiving tray; 12. through hole; 13. stirring plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] Example: A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid, comprising the following steps: Step 1: preparing the waste liquid of calcination roasting-acid leaching-ammonium salt precipitation of vanadium; First, prepare the calcination roasting-acid leaching-ammonium salt vanadium precipitation waste liquid, and add it into the first stage reaction vessel 8 located in the multi-stage reaction vessel 8 through the vanadium liquid feeding pipe 1; Step 2: The temperature is controlled within the range of 5℃-15℃, and vanadium precipitation agent is added; The temperature in the multi-stage reaction vessel 8 is maintained within the range of 5°C-15°C, and then the vanadium precipitant is sequentially added into the multi-stage reaction vessel 8 through the vanadium precipitant feeding pipe 3. In the hydrometallurgical process, the vanadium precipitant is used to convert the vanadium ions in the solution into insoluble vanadium compounds, thereby realizing the separation and recovery of vanadium; Step 3: stirring and settling; After adding the vanadium precipitation agent into the reaction container 8, the stirring motor 2 is started to rotate the stirring rod 4, and the stirring rod 4 can stir at a low speed in the reaction container 8 through the stirring blade 5. After stirring for a certain period of time, precipitation is performed. The vanadium precipitation time is 10min-20min, and the stirring speed is 100-500r / min; Step 4: Separating vanadium materials and tailings; During the precipitation process, the tailings are firstly passed through the tailings discharge pipe 7 to enter the next stage reaction vessel 8, while the vanadium precipitated materials are discharged through the vanadium material discharge pipe 6; Step 5: The vanadium material is filtered and dried to obtain the vanadium product. The tailings are reused as production waste liquid; The vanadium precipitation material discharged from the vanadium material discharge pipe 6 is filtered and dried to finally obtain the ammonium polyvanadate product, and the tailings are used as production waste liquid and enter the next-level reaction vessel 8 through the tailings discharge pipe 7 for reuse. The continuous vanadium precipitation production operation can shorten the vanadium precipitation time and improve the unit production efficiency; the reaction is carried out at a low temperature, and no heating equipment is required, which reduces energy consumption and safety risks, and can also significantly reduce the impurity content of the precipitated product, providing a raw material basis for the subsequent process to obtain high-purity vanadium pentoxide.

[0022] When in use, magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension is used to replace ammonium salt as a catalytic induced precipitant of vanadium, and ammonium polyvanadate particles are added as "inducing nuclei". Through catalytic induction, the rapid growth of ammonium polyvanadate is promoted, the vanadium precipitation rate is targeted to be increased, and the reaction time is shortened. The reaction is carried out under low temperature conditions to reduce the generation of impurities, and a "vortex" is formed by low-speed stirring in the reaction vessel 8. The vanadium precipitation product is enriched in the center of the "vortex" and discharged in time, reducing the mixing of other harmful impurities in the vanadium precipitation process, so as to obtain a high-purity ammonium polyvanadate product.

[0023] Commonly used vanadium precipitants include sodium hydroxide, ammonium carbonate, ammonia water, oxalic acid, sodium sulfide, etc. Here, we prefer the vanadium precipitant to be a magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension. By using the magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension instead of ammonium salt as a catalytic induced precipitant of vanadium, ammonium polyvanadate particles are added as "nuclei" to promote the rapid growth of ammonium polyvanadate.

[0024] Moreover, the magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension has a Mg2+ concentration of 0.1-0.5 mol / L, an NH4+ concentration of 1-3 mol / L, a hydrogen peroxide concentration of 0.01-0.05 mol / L, and an ammonium polyvanadate concentration of 2-6 g / L. The fineness of the ammonium polyvanadate is 10-20 μm. The molar ratio of the amount of ammonium salt in the vanadium precipitation process to the amount of vanadium in the calcination roasting-acid leaching-ammonium salt vanadium precipitation waste liquid is 2:1-5:1.

[0025] Mg(NH3)22+ in the compound solution has a stronger ability to bind to V in the solution than NH4+, which increases the precipitation reaction rate. At the same time, the ammonium polyvanadate particles are added as the "core", and trace amounts of hydrogen peroxide are used to "clean" the surface to expose more active sites. Mg(NH3)22+ is adsorbed on the surface of the ammonium polyvanadate particles, which increases the reaction activity with the vanadate ions in the solution and promotes the selective and rapid growth of ammonium polyvanadate. Through catalytic induction, under low temperature conditions, the vanadium precipitation rate is targeted to be increased, the reaction time is shortened, the vanadium precipitation product is removed in time, and the mixing of other harmful impurities in the vanadium precipitation process is reduced to obtain a high-purity ammonium polyvanadate product.

[0026] Reference Figure 1-Figure 4, a device for secondary recovery of vanadium from calcified roasting vanadium extraction waste liquid, including the above-mentioned process for secondary recovery of vanadium from calcified roasting vanadium extraction waste liquid, and also including a multi-stage reaction vessel 8, the reaction vessel 8 is provided with two to six stages, here, we prefer three stages, the three-stage reaction vessel 8 is sequentially connected through the tailing discharge pipe 7 to form a series form, that is, the tailing discharge pipe 7 of the upper-stage reaction vessel 8 is connected with the vanadium liquid feeding pipe 1 of the lower-stage reaction vessel 8, the first-stage reaction vessel 8 is fixedly provided with a vanadium liquid feeding pipe 1, the bottom of the three-stage reaction vessel 8 is fixedly provided with a vanadium material discharge pipe 6, and the three-stage reaction vessel 8 is fixedly provided with a vanadium precipitant feeding pipe 3, which is convenient for adding vanadium precipitants into the corresponding reaction vessel 8, and the preparation of the agent is simple, the dosage is low and the economic benefit is obvious. A stirring component is provided in the multi-stage reaction vessel 8, and the materials can be fully mixed by stirring to improve the reaction effect. By setting up a multi-stage reaction vessel 8, the recovery can be enhanced, the vanadium precipitation rate can be significantly improved, and the continuous vanadium precipitation production operation can be carried out to shorten the vanadium precipitation time and improve the unit production efficiency; the reaction is carried out at room temperature, no heating equipment is required, energy consumption is reduced, safety risks are reduced, and the impurity content of the precipitated product can be significantly reduced, providing a raw material basis for the subsequent process to obtain high-purity vanadium pentoxide.

[0027] Reference Figure 1 and Figure 3 , connect multiple groups of vanadium material discharge pipes 6 through the vanadium material discharge collection pipe 9, and connect the tailings discharge pipe 7 of the last stage through the tailings discharge collection pipe 10. When in use, connect multiple groups of vanadium material discharge pipes 6 through the vanadium material discharge collection pipe 9 to facilitate the centralized collection of vanadium precipitated materials. Similarly, connect the tailings discharge pipe 7 of the last stage through the tailings discharge collection pipe 10 to facilitate the collection of tailings, reduce output ports, and improve the use effect.

[0028] Reference Figure 3 The stirring assembly includes multiple groups of stirring rods 4, and the stirring rods 4 are provided with two to six groups, preferably three groups. The three groups of stirring rods 4 are rotated and arranged in the corresponding reaction containers 8 respectively. Top covers are removably provided on the three groups of reaction containers 8, and the top covers are fixed to the reaction containers 8 with bolts or buckles. Here, we prefer buckles, which are convenient for assembly and disassembly, and convenient for cleaning the reaction container 8 to improve the use effect. A stirring motor 2 is fixedly provided on the top cover, and one end of the stirring rod 4 is fixedly connected to the output end of the stirring motor 2, and a stirring blade 5 is fixedly provided on the stirring rod 4. Moreover, a vanadium precipitation agent feeding pipe 3 is fixedly provided on the top cover. When in use, the stirring motor 2 is started to rotate the stirring rod 4, and the stirring rod 4 can stir with the stirring blade 5 in the reaction container 8 to improve the reaction effect.

[0029] Reference Figure 3 and Figure 4A receiving tray 11 is fixedly provided on one end of the stirring rod 4 close to the top cover, and the output end of the vanadium precipitant feeding pipe 3 is connected to the receiving tray 11. A through hole 12 is opened on the receiving tray 11, and a stirring plate 13 is fixedly provided on the bottom of the top cover, and the stirring plate 13 is extended into the receiving tray 11. When in use, by fixing the receiving tray 11 on the stirring rod 4, when the vanadium precipitant is added into the reaction vessel 8 through the vanadium precipitant feeding pipe 3, the vanadium precipitant suspension will fall into the receiving tray 11. At this time, the stirring rod 4 stirs with the stirring blade 5, and can rotate with the receiving tray 11 at the same time. During the rotation, the stirring plate 13 can stir and impact the suspension in the receiving tray 11, which can not only stir and mix the suspension, but also subdivide it, so as to improve the reaction effect with the calcination roasting-acid leaching-ammonium salt vanadium precipitation waste liquid.

[0030] In the present invention, taking the waste liquid of vanadium extraction from calcified roasting of vanadium slag in a vanadium smelter in Panxi area as an example, the vanadium-containing acid leaching solution contains V5.25g / L, P0.125g / L, Mn13.54g / L, Fe0.064g / L, SiO20.52g / L, Al0.021g / L, and the catalytic induction-low temperature flash precipitation process steps of the waste liquid of calcified roasting vanadium extraction are as follows: The vanadium precipitation rate reached 99.31% and the purity of ammonium polyvanadate product reached 99.41% by adopting the catalytic induction-low-temperature flash vanadium precipitation process of calcification roasting vanadium extraction waste liquid.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid, characterized in that: The following steps are involved: Step 1: preparing the waste liquid of calcination roasting-acid leaching-ammonium salt precipitation of vanadium; Step 2: The temperature is controlled within the range of 5℃-15℃, and vanadium precipitation agent is added; Step 3: stirring and settling; Step 4: Separating vanadium materials and tailings; Step 5: The vanadium material is filtered and dried to obtain the vanadium product, and the tailings are reused as production waste liquid.

2. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 1, characterized in that: The vanadium precipitating agent is a composite suspension of magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate.

3. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 2, characterized in that: The magnesium salt-ammonium salt-hydrogen peroxide-ammonium polyvanadate composite suspension has a Mg2+ concentration of 0.1-0.5 mol / L, an NH4+ concentration of 1-3 mol / L, a hydrogen peroxide concentration of 0.01-0.05 mol / L, and an ammonium polyvanadate concentration of 2-6 g / L.

4. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 2, characterized in that: The fineness of the ammonium polyvanadate is 10-20 μm.

5. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 2, characterized in that: The molar ratio of the amount of ammonium salt used in the vanadium precipitation process to the amount of vanadium in the waste liquid of calcination roasting-acid leaching-ammonium salt vanadium precipitation is 2:1-5:

1.

6. A process for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 1, characterized in that: The vanadium precipitation time is 10min-20min, and the stirring speed is 100-500r / min.

7. A device for secondary recovery of vanadium from waste liquor of vanadium extraction by calcination roasting, applied to the process for secondary recovery of vanadium from waste liquor of vanadium extraction by calcination roasting as claimed in any one of claims 1 to 6, characterized in that: It also comprises a multi-stage reaction container (8), wherein the multi-stage reaction containers (8) are connected in sequence through a tailing material discharge pipe (7), a vanadium liquid feeding pipe (1) is fixedly arranged on the first-stage reaction container (8), a vanadium material discharge pipe (6) is fixedly arranged on the bottom of each of the multi-stage reaction containers (8), and a vanadium precipitant feeding pipe (3) is fixedly arranged on each of the multi-stage reaction containers (8), and a stirring assembly is arranged inside each of the multi-stage reaction containers (8).

8. The device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 7, characterized in that: The plurality of groups of vanadium material discharge pipes (6) are connected via a vanadium material discharge collection pipe (9), and the tailing material discharge pipes (7) at the last stage are connected via a tailing material discharge collection pipe (10).

9. The device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 7, characterized in that: The stirring assembly comprises a plurality of groups of stirring rods (4), the plurality of groups of stirring rods (4) being rotatably arranged in a reaction container (8), the plurality of reaction containers (8) being provided with a detachable top cover, a stirring motor (2) being fixedly arranged on the top cover, one end of the stirring rod (4) being fixedly connected to an output end of the stirring motor (2), a stirring blade (5) being fixedly arranged on the stirring rod (4), and the vanadium precipitation agent feeding pipe (3) being fixedly arranged on the top cover.

10. The device for secondary recovery of vanadium from calcification roasting vanadium extraction waste liquid according to claim 9, characterized in that: A receiving tray (11) is fixedly provided on the stirring rod (4), an output end of the vanadium precipitation agent feeding pipe (3) is connected to the receiving tray (11), a through hole (12) is provided on the receiving tray (11), a stirring plate (13) is fixedly provided on the bottom of the top cover, and the stirring plate (13) extends into the receiving tray (11).

Images