A new nickel sulfate production device and a nickel sulfate production method

Abstract

The present invention discloses a novel nickel sulfate production device and a method for producing nickel sulfate. The device includes a negative pressure air extraction device, a hydrogen gas alarm, a control device, a first reaction kettle, a second reaction kettle, an upper reflux pipeline and a lower reflux pipeline arranged between the first reaction kettle and the second reaction kettle, and an upper reflux mortar pump and a lower reflux mortar pump respectively arranged on the upper reflux pipeline and the lower reflux pipeline. The method includes steps such as pre-reaction, reflux reaction, discharging, and hydrogen gas content control. The device and method disclosed in the present invention for preparing nickel sulfate can effectively reduce the hydrogen gas concentration in the reaction device, greatly reduce the risk of hydrogen gas explosion; can improve the dissolution rate of nickel beans and increase the output. In addition, the production method disclosed in the present invention only adds hydrogen peroxide when the hydrogen gas concentration is high, which can effectively reduce the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy, and particularly to a novel nickel sulfate production device and a nickel sulfate production method. Background Art

[0002] In the prior art, for the device that uses nickel beans (or nickel powder, nickel blocks, nickel grains) to react with sulfuric acid solution to produce nickel sulfate, a common reaction kettle with a stirring paddle is usually adopted. The reaction process is usually to add nickel beans at the bottom of the reaction kettle first, and then add sulfuric acid solution or add hydrogen peroxide and sulfuric acid solution, and start the stirring paddle to start the reaction. However, the existing nickel dissolution devices and methods have several problems: when using nickel beans and sulfuric acid solution as reaction raw materials, a large amount of hydrogen gas will be generated during the reaction of nickel with sulfuric acid. Hydrogen gas is a combustible gas. When the hydrogen gas concentration in the reaction kettle reaches a certain level, it is easy to produce an explosion hazard. Moreover, due to the relatively large density of nickel beans, they usually sink to the bottom of the reaction kettle, and it is difficult for the ordinary stirring paddle of the reaction kettle to fully stir the nickel beans at the bottom of the kettle, resulting in low reaction efficiency; when using nickel beans, sulfuric acid and hydrogen peroxide as reaction raw materials, because the price of hydrogen peroxide is relatively high, the production cost will be greatly increased. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a novel nickel sulfate production device and a nickel sulfate production method, which specifically include the following content:

[0004] A novel nickel sulfate production device, characterized in that it includes a negative pressure exhaust device, a hydrogen gas alarm, a control device, a first reaction kettle, a second reaction kettle, an upper reflux pipeline and a lower reflux pipeline arranged between the first reaction kettle and the second reaction kettle, and an upper reflux mortar pump and a lower reflux mortar pump respectively arranged on the upper reflux pipeline and the lower reflux pipeline; a negative pressure air outlet is arranged at the top of the first reaction kettle, a discharge port is arranged on the side wall of the first reaction kettle, a discharge valve is arranged at the discharge port, a first discharge port is arranged at the bottom of the first reaction kettle, and a first discharge valve is arranged at the first discharge port; a sulfuric acid input pipe, a pure water input pipe, and a hydrogen peroxide input pipe are arranged on the second reaction kettle, and a hydrogen peroxide input valve is arranged on the hydrogen peroxide input pipe; a second discharge port is arranged at the bottom of the second reaction kettle, and a second discharge valve is arranged at the second discharge port; one end of the negative pressure exhaust device is communicated with the inside of the first reaction kettle through the negative pressure air outlet, and the other end of the negative pressure exhaust device is connected with the hydrogen gas alarm; the control device includes an input system, a calculation system, and a control system. One end of the input system is signal-connected to the hydrogen gas alarm, and the other end is signal-connected to the calculation system; one end of the control system is signal-connected to the calculation system, and the other end is signal-connected to the hydrogen peroxide input valve.

[0005] Specifically, the first reaction kettle includes a water outlet area at the top, a buffer area in the upper middle part, a reaction area in the lower middle part, and an aeration area at the bottom. A discharge port is arranged on the side wall of the water outlet area, a first reflux outlet is arranged on the side wall of the buffer area, a first reflux inlet is arranged at the bottom of the aeration area, and a porous bottom support plate is arranged at the top of the aeration area; a second reflux inlet is arranged at the upper part of the side wall of the second reaction kettle, and a second reflux outlet is arranged at the lower part of the side wall of the second reaction kettle. The second reflux inlet is connected to the first reflux outlet through an upper reflux pipeline, and the second reflux outlet is connected to the first reflux inlet through a lower reflux pipeline.

[0006] Specifically, a bottom aeration device is arranged in the aeration area at the bottom of the first reaction kettle. The bottom aeration device includes an air inlet communicated with the outside and at least one perforated pipe communicated with the air inlet. The perforated pipe is horizontally arranged in the aeration area at the bottom of the reaction kettle, and a plurality of ventilation holes opening downward are arranged on the perforated pipe.

[0007] Specifically, the bottom aeration device includes a plurality of connected perforated pipes, and the plurality of perforated pipes are uniformly distributed in the horizontal direction.

[0008] Specifically, the first reaction kettle further includes a three-phase separation area, and the three-phase separation area is arranged between the water outlet area at the top and the buffer area in the upper middle part; the novel nickel sulfate production device further includes a negative pressure extraction air pipe and a three-phase separator arranged in the three-phase separation area; the negative pressure extraction air pipe includes a first end and a second end. The first end of the negative pressure extraction air pipe is connected to a negative pressure extraction device, and the second end of the negative pressure extraction air pipe passes through a negative pressure air outlet at the top of the first reaction kettle and extends into the three-phase separation area of the first reaction kettle to be connected to the three-phase separator.

[0009] Specifically, a feed inlet is further arranged on the side wall of the buffer area in the upper middle part of the first reaction kettle; the novel nickel sulfate production device further includes a feeding device, and the feeding device includes a hopper with a nitrogen sealing system, a feeding pipe and a check valve; one end of the feeding pipe is connected to the discharge port of the hopper, and the other end is connected to the feed inlet of the first reaction kettle. The check valve is arranged at the connection between the feeding pipe and the outlet of the hopper.

[0010] Specifically, the device further includes an alkali spray tower, and the alkali spray tower is connected to the negative pressure extraction device.

[0011] Specifically, a stirring device is further arranged in the second reaction kettle.

[0012] A method for producing nickel sulfate by using the novel nickel sulfate production device disclosed by the present invention includes the following steps:

[0013] (1) Pre-reaction: Add appropriate amounts of nickel beans and a pre-prepared sulfuric acid solution into the first reaction kettle in proportion, and turn on the aeration device and the negative pressure extraction device;

[0014] (2) Reflux reaction: Start the upper reflux mortar pump, transfer the mixed slurry in the buffer zone of the first reactor to the second reactor through the upper reflux pipeline for reaction, and add sulfuric acid and pure water to the second reactor through the sulfuric acid input pipe and the pure water input pipe; when the liquid in the second reactor reaches a certain volume, start the lower reflux mortar pump, and input the reaction system in the second reactor back to the first reactor through the lower reflux pipeline;

[0015] (3) Discharging: When the liquid level in the first reactor is higher than the discharge port, first take a sample for detection through the discharge port. When the nickel concentration in the sample is greater than or equal to 120 g / L, discharge through the discharge port to the outside of the first reactor;

[0016] (4) When all the nickel beans added in step (1) are completely reacted, stop feeding the second reactor, close the first mortar pump and the second mortar pump, stop the reflux of the reaction system, and at the same time open the first discharge valve and the second discharge valve to discharge all the reaction liquid in the first reactor and the second reactor;

[0017] (5) Hydrogen content control: During the reaction process, continuously detect the hydrogen content in the gas discharged from the first reactor through a hydrogen alarm connected to the negative pressure exhaust device, and input the hydrogen content information into the calculation system through the input system of the control device. When the calculation system detects that the hydrogen content > the set threshold a, send a control instruction to the control system, and the control system controls the hydrogen peroxide input valve on the hydrogen peroxide input pipe of the second reactor to open, and start adding hydrogen peroxide to the second reactor; when it is detected that the hydrogen content ≤ the set threshold a, control the hydrogen peroxide input valve to close through the control device, and stop adding hydrogen peroxide to the second reactor.

[0018] Specifically, the set threshold a is 10000 ppm.

[0019] Advantages of the present invention:

[0020] (1) A bottom aeration device is provided at the bottom of the first reactor, and a large amount of air is introduced into the reaction system through the perforated pipe of the aeration device. On the one hand, it can dilute the hydrogen concentration in the reactor and control the hydrogen concentration below the explosion limit, effectively preventing the occurrence of explosion; on the other hand, a large amount of gas enters the reaction system, which can stir the reaction liquid and the nickel powder and a small number of small nickel beans precipitated at the bottom of the reactor, improving the reaction rate;

[0021] (2) A pre-reaction is carried out in the first reactor, and then the slurry of the pre-reaction is introduced into the second reactor through the upper reflux pipe for reflux reaction, and the reaction system between the first reactor and the second reactor is circulated by using the lower reflux pipeline. In the second reactor, nickel powder is mainly dissolved into nickel sulfate, and in the first reactor, nickel beans are mainly dissolved into nickel powder. On the one hand, it can increase the agitation of the reaction system and improve the overall reaction rate. On the other hand, it can avoid the appearance of large nickel beans in the second reactor, thus avoiding the impact of nickel beans on the stirring device, reducing the loss of the stirring device, and improving the service life of the reaction device. At the same time, a porous bottom support plate is arranged at the top of the aeration zone of the first reactor. On the one hand, it can prevent nickel beans from sinking to the bottom and increase the contact between nickel beans and sulfuric acid solution. On the other hand, it can also prevent nickel beans from entering the lower reflux pipeline and causing blockage;

[0022] (3) The hydrogen concentration in the exhaust gas from the first reactor is monitored by a hydrogen gas alarm. When the hydrogen concentration is higher than 10,000 ppm, the hydrogen peroxide input valve is controlled to open by the control device, and hydrogen peroxide is added to the second reactor, so as to reduce the generation rate of hydrogen in the reaction system and reduce the safety risk of production. The principle is as follows:

[0023] ①: Ni + H2O2 → NiO + H2O

[0024] ②: NiO + H2SO4 → NiSO4 + H2↑

[0025] ③ = ① + ②: Ni + H2O2 + H2SO4 → NiSO4 + 2H2O + H2↑

[0026] ④: Ni + H2SO4 → NiSO4 + H2↑

[0027] In the whole reaction system, the hydrogen generation rate is only related to the acidity. After adding hydrogen peroxide, in an acidic environment, reaction ① occurs preferentially. Nickel beans will be first oxidized by hydrogen peroxide into nickel oxide and then react with sulfuric acid. In this reaction process, due to the generation of water, the acidity decreases and the pH of the solution increases. Therefore, the hydrogen generation rate will decrease.

[0028] When the hydrogen concentration is lower than 10,000 ppm, the hydrogen peroxide input valve is controlled to close by the control device, and the addition of hydrogen peroxide to the second reactor is stopped. In the prior art, the dissolution rate of nickel is increased by adding hydrogen peroxide. In the present invention, hydrogen peroxide is only added when the hydrogen concentration is high, aiming to reduce the generation rate of hydrogen and control the production cost. Of course, if the cost is not concerned and rapid preparation of nickel sulfate is required, the hydrogen peroxide input valve can be kept open and hydrogen peroxide can be continuously introduced;

[0029] (4) A negative pressure exhaust device is arranged at the top of the first reactor, which can timely extract hydrogen and acid mist and reduce the hydrogen concentration in the reactor;

[0030] (5) The nickel bean feeding device of the device disclosed in the present invention adopts a hopper with a nitrogen sealing system. When feeding, first open the top cover of the hopper, add nickel beans into the hopper, then close the top cover, open the nitrogen sealing system, and fill nitrogen into the hopper. When the air pressure in the hopper reaches a certain set value, open the one-way valve at the bottom of the hopper to feed the first reactor. After the feeding is completed, close the one-way valve. During this process, due to the nitrogen sealing effect in the hopper, it can effectively prevent the gas in the first reactor from leaking during feeding, causing potential safety hazards. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of the novel nickel sulfate production device disclosed in the present invention;

[0032] Figure 2 is a schematic diagram of the signal transmission between the hydrogen gas alarm, the control device, and the hydrogen peroxide input valve in the device disclosed in the present invention. Detailed Embodiments

[0033] The present invention will be described in detail below with reference to the drawings and specific embodiments. The embodiments shown below do not limit the content of the invention described in the claims in any way. In addition, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention described in the claims.

[0034] Refer to the attached Figure 1, a new nickel sulfate production device, including a negative pressure exhaust device, a hydrogen gas alarm (not shown in the figure), an alkali spray tower (not shown in the figure), a control device, a first reaction kettle 1, a second reaction kettle 2, an upper reflux pipeline 3 and a lower reflux pipeline 4 arranged between the first reaction kettle 1 and the second reaction kettle 2, and an upper reflux mortar pump 5 and a lower reflux mortar pump 6 respectively arranged on the upper reflux pipeline 3 and the lower reflux pipeline 4; a negative pressure air outlet 7 is arranged at the top of the first reaction kettle 1, a discharge port 8 is arranged on the side wall of the first reaction kettle 1, a discharge valve is arranged at the discharge port, a first discharge port 27 is arranged at the bottom of the first reaction kettle 1, and a first discharge valve is arranged at the first discharge port 27; a sulfuric acid input pipe 9, a pure water input pipe 10, and a hydrogen peroxide input pipe 11 are arranged at the top of the second reaction kettle 2, and a hydrogen peroxide input valve 12 is arranged on the hydrogen peroxide input pipe 11; a second discharge port 28 is arranged at the bottom of the second reaction kettle 2, and a second discharge valve is arranged at the second discharge port 28; one end of the negative pressure exhaust device is communicated with the inside of the first reaction kettle 1 through the negative pressure air outlet 7, and the other end of the negative pressure exhaust device is connected with the hydrogen gas alarm and the alkali spray tower. The specific connection method can be: a main pipe and a branch pipe are arranged at the air outlet of the negative pressure exhaust device. The main pipe leads the discharged gas into the alkali spray tower, and the branch pipe leads a part of the discharged gas to the hydrogen gas alarm. The hydrogen gas alarm is used to detect the concentration of hydrogen in the gas, and the alkali spray tower is used to absorb substances such as acid in the discharged gas; the control device includes an input system, a calculation system and a control system. One end of the input system is signal-connected to the hydrogen gas alarm, and the other end is signal-connected to the calculation system; one end of the control system is signal-connected to the calculation system, and the other end is signal-connected to the hydrogen peroxide input valve 12. The signal connection here can be an electrical connection or other forms of signal connection, which is not limited here.

[0035] In an embodiment of the present invention, the first reaction kettle 1 includes a water outlet area 13 at the top, a buffer area 14 in the upper middle part, a reaction area in the lower middle part and an aeration area 15 at the bottom. A discharge port 8 is arranged on the side wall of the water outlet area 13, a first reflux outlet is arranged on the side wall of the buffer area 14, a first reflux inlet is arranged at the bottom of the aeration area 15, and a porous bottom support plate 16 is arranged at the top of the aeration area 15. The bottom support plate 16 is horizontally arranged in the first reaction kettle 1, and the periphery of the bottom support plate 16 is connected to the side wall of the first reaction kettle 1. The bottom support plate 16 is used to place nickel beans, and the nickel beans are stacked on the bottom support plate to form a nickel bean stacking area 17; a second reflux inlet is arranged at the upper part of the side wall of the second reaction kettle 2, and a second reflux outlet is arranged at the lower part of the side wall of the second reaction kettle 2. The second reflux inlet is connected to the first reflux outlet through the upper reflux pipeline 3, and the second reflux outlet is connected to the first reflux inlet through the lower reflux pipeline 4. The reaction system transported in the upper reflux pipeline 3 is mainly nickel sulfate and supplemented by nickel powder, and the reaction system transported in the lower reflux pipeline 4 is mainly nickel powder and supplemented by nickel sulfate.

[0036] In one embodiment of the present invention, a bottom aeration device is provided in the aeration zone 15 at the bottom of the first reactor 1. The bottom aeration device includes an air inlet 18 communicating with the outside and at least one perforated pipe communicating with the air inlet. The perforated pipe is horizontally arranged in the aeration zone 15 at the bottom of the reactor, and a plurality of ventilation holes opening downward are provided on the perforated pipe.

[0037] In one embodiment of the present invention, the bottom aeration device includes a plurality of connected perforated pipes 19, and the plurality of perforated pipes 19 are uniformly distributed in the horizontal direction.

[0038] In one embodiment of the present invention, the first reactor 1 further includes a three-phase separation zone 20, and the three-phase separation zone 20 is arranged between the water outlet zone 13 at the top and the buffer zone 14 in the middle; the novel nickel sulfate production device further includes a negative pressure extraction air pipe 21 and a three-phase separator arranged in the three-phase separation zone 20; the negative pressure extraction air pipe 21 includes a first end and a second end. The first end of the negative pressure extraction air pipe 21 is connected to a negative pressure extraction device, and the second end of the negative pressure extraction air pipe 21 passes through the negative pressure air outlet 7 at the top of the first reactor 1 and extends into the three-phase separation zone of the first reactor 1 to be connected to the three-phase separator 22. The three-phase separator 22 can separate the gas, liquid, and solid phases in the reaction system. The second end of the negative pressure extraction air pipe 21 is connected to the gas separation end of the three-phase separator 22, and the second end of the negative pressure extraction air pipe 21 is communicated with the top of the gas chamber of the three-phase separator 22.

[0039] In one embodiment of the present invention, a feed inlet is further provided on the side wall of the buffer zone 14 in the middle of the first reactor 1; the novel nickel sulfate production device further includes a feeding device, and the feeding device includes a hopper 23 with a nitrogen sealing system and a feeding pipe 24; one end of the feeding pipe 24 is connected to the discharge port 8 of the hopper 23, and the other end is connected to the feed inlet of the first reactor 1. A one-way valve 25 is provided at the connection between the feeding pipe 24 and the outlet of the hopper 23. The top of the hopper 23 with a nitrogen sealing system adopted in the present invention is provided with a top cover that can be opened. The nitrogen sealing system includes a nitrogen input system and a gas discharge system, and the nitrogen pressure in the hopper 23 can be controlled by controlling the nitrogen input system and the gas discharge system. When feeding the hopper 23, first open the top cover of the hopper 23, add nickel beans to the hopper 23, then close the top cover, open the nitrogen sealing system, and fill nitrogen into the hopper 23. When the air pressure in the hopper 23 reaches a certain set value, open the one-way valve at the bottom of the hopper 23 to feed into the first reactor, and close the one-way valve after the feeding is completed. During this process, due to the nitrogen sealing effect in the hopper, it can effectively prevent the gas in the first reactor from leaking during feeding, causing potential safety hazards.

[0040] In one embodiment of the present invention, the second reactor 2 is further provided with a stirring device 26.

[0041] A method for producing nickel sulfate using the novel nickel sulfate production device disclosed in the present invention, comprising the following steps:

[0042] (1) Pre-reaction: Add an appropriate amount of nickel beans and a pre-prepared sulfuric acid solution to the first reaction kettle 1 in proportion, and turn on the aeration device and the negative pressure exhaust device;

[0043] (2) Reflux reaction: Turn on the upper reflux mortar pump 5, transfer the mixed slurry in the buffer zone 14 of the first reaction kettle 1 to the second reaction kettle 2 through the upper reflux pipeline for reaction, and add sulfuric acid and pure water to the second reaction kettle 2 through the sulfuric acid input pipe 9 and the pure water input pipe 10; When the liquid in the second reaction kettle 2 reaches a certain volume, turn on the lower reflux mortar pump 6, and input the reaction system in the second reaction kettle 2 back into the first reaction kettle 1 through the lower reflux pipeline;

[0044] (3) Discharging: When the liquid level in the first reaction kettle 1 is higher than the discharge port 8, first take a sample for detection through the discharge port 8. When the nickel concentration in the sample is greater than or equal to 120 g / L, discharge to the outside of the first reaction kettle 1 through the discharge port 8;

[0045] (4) When the nickel beans added in step (1) are completely reacted, stop feeding the second reaction kettle 2, close the first mortar pump 5 and the second mortar pump 6, stop the reflux of the reaction system, and at the same time open the first discharge valve and the second discharge valve to discharge all the reaction liquids in the first reaction kettle 1 and the second reaction kettle 2;

[0046] (5) Hydrogen content control: During the reaction process, continuously detect the hydrogen content in the gas discharged from the first reaction kettle 1 through a hydrogen alarm connected to the negative pressure exhaust device. When the detected hydrogen content > the set threshold a, control the hydrogen peroxide input valve 12 on the hydrogen peroxide input pipe 11 of the second reaction kettle 2 to open through the control device, and start adding hydrogen peroxide to the second reaction kettle 2; When the detected hydrogen content ≤ the set threshold a, control the hydrogen peroxide input valve 12 to close through the control device, and stop adding hydrogen peroxide to the second reaction kettle 2. The signal transmission relationship between the control device disclosed in the present invention and the hydrogen alarm and the hydrogen peroxide input valve 12 is as shown in the appendix Figure 2 shown. The hydrogen alarm transmits the hydrogen concentration signal to the input system of the control device. The input system transmits the signal to the calculation system. The calculation system compares the real-time hydrogen concentration with the set threshold, calculates the control signal, and transmits the control signal to the control system. The control system controls the opening and closing of the hydrogen peroxide input valve 12 according to the control signal.

[0047] In an embodiment of the present invention, the set threshold a is 10000 ppm.

[0048] The device disclosed in the present invention is provided with a bottom aeration device at the bottom of the first reaction kettle 1. A large amount of air is introduced into the reaction system through the perforated pipe 19 of the aeration device. On the one hand, it can dilute the hydrogen concentration in the reaction kettle, control the hydrogen concentration below the explosion limit, and effectively prevent the occurrence of explosion; on the other hand, a large amount of gas entering the reaction system can stir the reaction liquid and the nickel beans on the bottom supporting plate 16, improving the reaction rate.

[0049] The device disclosed in the present invention conducts a pre-reaction in the first reaction kettle 1, and then uses the upper return pipe to introduce the pre-reacted slurry into the second reaction kettle 2 for a reflux reaction, and uses the lower return pipe 4 to realize the circulation of the reaction system between the first reaction kettle 1 and the second reaction kettle 2. On the one hand, it can increase the disturbance of the reaction system and improve the reaction efficiency; on the other hand, it can avoid the appearance of large nickel beans in the second reaction kettle 2, thereby avoiding the impact of nickel beans on the stirring device 26, reducing the loss of the stirring device 26, and improving the service life of the reaction device; at the same time, a porous bottom supporting plate 16 is arranged at the top of the aeration zone 15 of the first reaction kettle 1. On the one hand, it can prevent the nickel beans from sinking to the bottom, increasing the contact between the nickel beans and the sulfuric acid solution; on the other hand, it can also prevent the nickel beans from entering the lower return pipe 4 and causing blockage.

[0050] The device disclosed in the present invention monitors the hydrogen concentration in the exhaust gas of the first reaction kettle 1 through a hydrogen gas detector. When the hydrogen concentration is higher than 10000 ppm, the hydrogen peroxide input valve 12 is controlled to open by the control device, and hydrogen peroxide is added to the second reaction kettle 2, so as to reduce the generation rate of hydrogen in the reaction system (it is better to clarify this principle), reducing the safety risk of production; when the hydrogen concentration is lower than 10000 ppm, the hydrogen peroxide input valve 12 is controlled to close by the control device, and the addition of hydrogen peroxide to the second reaction kettle 2 is stopped. In the prior art, hydrogen peroxide is added to increase the nickel dissolution rate. In the present invention, hydrogen peroxide is only added when the hydrogen concentration is high, aiming to reduce the generation rate of hydrogen and control the production cost. Of course, if the cost is not concerned and rapid preparation of nickel sulfate is required, the hydrogen peroxide input valve 12 can be kept open continuously to continuously introduce hydrogen peroxide.

[0051] The device disclosed in the present invention is provided with a negative pressure exhaust device at the top of the first reaction kettle 1, which can timely extract hydrogen and acid mist, reducing the hydrogen concentration in the reaction kettle.

[0052] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0053] Unless otherwise expressly stipulated and defined, the terms "arranged" and "connected" shall be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and can be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A new nickel sulfate production device, characterized in that, It includes a negative pressure exhaust device, a hydrogen gas alarm, a control device, a first reaction kettle, a second reaction kettle, an upper reflux pipeline and a lower reflux pipeline arranged between the first reaction kettle and the second reaction kettle, and an upper reflux mortar pump and a lower reflux mortar pump respectively arranged on the upper reflux pipeline and the lower reflux pipeline; a negative pressure air outlet is arranged at the top of the first reaction kettle, a discharge port is arranged on the side wall of the first reaction kettle, and a discharge valve is arranged at the discharge port; a first discharge port is arranged at the bottom of the first reaction kettle, and a first discharge valve is arranged at the first discharge port; a sulfuric acid input pipe, a pure water input pipe and a hydrogen peroxide input pipe are arranged on the second reaction kettle, and a hydrogen peroxide input valve is arranged on the hydrogen peroxide input pipe; a second discharge port is arranged at the bottom of the second reaction kettle, and a second discharge valve is arranged at the second discharge port; one end of the negative pressure exhaust device is communicated with the inside of the first reaction kettle through the negative pressure air outlet, and the other end of the negative pressure exhaust device is connected with the hydrogen gas alarm; the control device includes an input system, a calculation system and a control system, one end of the input system is signal-connected with the hydrogen gas alarm, and the other end is signal-connected with the calculation system; one end of the control system is signal-connected with the calculation system, and the other end is signal-connected with the hydrogen peroxide input valve; the first reaction kettle includes a water outlet area at the top, a buffer area in the upper middle part, a reaction area in the lower middle part and an aeration area at the bottom, a discharge port is arranged on the side wall of the water outlet area, a first reflux outlet is arranged on the side wall of the buffer area, a first reflux inlet is arranged at the bottom of the aeration area, and a porous bottom support plate is arranged at the top of the aeration area; a second reflux inlet is arranged at the upper part of the side wall of the second reaction kettle, a second reflux outlet is arranged at the lower part of the side wall of the second reaction kettle, the second reflux inlet is connected with the first reflux outlet through the upper reflux pipeline, and the second reflux outlet is connected with the first reflux inlet through the lower reflux pipeline; a feed inlet is further arranged on the side wall of the buffer area in the upper middle part of the first reaction kettle; the novel nickel sulfate production device further includes a feeding device, and the feeding device includes a hopper with a nitrogen sealing system, a feeding pipe and a one-way valve; one end of the feeding pipe is connected with the discharge port of the hopper, and the other end is connected with the feed inlet of the first reaction kettle, and the one-way valve is arranged at the connection of the feeding pipe and the hopper outlet; it further includes an alkali spray tower, and the alkali spray tower is connected with the negative pressure exhaust device.

2. A novel nickel sulfate production device according to claim 1, characterized in that, A bottom aeration device is arranged in the aeration area at the bottom of the first reaction kettle, and the bottom aeration device includes an air inlet communicated with the outside and at least one perforated pipe communicated with the air inlet, the perforated pipe is horizontally arranged in the aeration area at the bottom of the reaction kettle, and a plurality of ventilation holes opening downward are arranged on the perforated pipe.

3. A novel nickel sulfate production device according to claim 2, characterized in that, The bottom aeration device includes a plurality of connected perforated pipes, and the plurality of perforated pipes are uniformly distributed along the horizontal direction.

4. A novel nickel sulfate production device according to claim 1, characterized in that, The first reactor further includes a three-phase separation zone, which is arranged between the water outlet zone at the top and the buffer zone in the upper middle part; the novel nickel sulfate production device further includes a negative pressure extraction air pipe and a three-phase separator arranged in the three-phase separation zone; the negative pressure extraction air pipe includes a first end and a second end. The first end of the negative pressure extraction air pipe is connected to a negative pressure extraction device, and the second end of the negative pressure extraction air pipe passes through the negative pressure air outlet at the top of the first reactor and extends into the three-phase separation zone of the first reactor to be connected to the three-phase separator.

5. A novel nickel sulfate production device according to claim 1, characterized in that, The second reactor is further provided with a stirring device.

6. A method for producing nickel sulfate using the novel nickel sulfate production device according to any one of claims 1-5, characterized in that, It includes the following steps: (1) Pre-reaction: Add an appropriate amount of nickel beans and a pre-prepared sulfuric acid solution to the first reactor in proportion, and turn on the aeration device and the negative pressure extraction device; (2) Reflux reaction: Turn on the upper reflux mortar pump, transfer the mixed slurry in the buffer zone of the first reactor to the second reactor through the upper reflux pipeline for reaction, and add sulfuric acid and pure water to the second reactor through the sulfuric acid input pipe and the pure water input pipe; when the liquid in the second reactor reaches a certain volume, turn on the lower reflux mortar pump, and input the reaction system in the second reactor back into the first reactor through the lower reflux pipeline; (3) Discharging: When the liquid level in the first reactor is higher than the discharge port, first take a sample for detection through the discharge port. When the nickel concentration in the sample is greater than or equal to 120 g / L and discharging, discharge from the first reactor through the discharge port; (4) When the nickel beans added in step (1) are completely reacted, stop feeding the second reactor, close the first mortar pump and the second mortar pump, stop the reflux of the reaction system, and at the same time open the first discharge valve and the second discharge valve to discharge all the reaction liquids in the first reactor and the second reactor; (5) Hydrogen content control: During the reaction process, continuously detect the hydrogen content in the gas discharged from the first reactor through a hydrogen alarm connected to the negative pressure extraction device, and input the hydrogen content information into the calculation system through the input system of the control device. When the calculation system detects that the hydrogen content > the set threshold a, send a control instruction to the control system, and the control system controls the hydrogen peroxide input valve on the hydrogen peroxide input pipe of the second reactor to open, and start adding hydrogen peroxide to the second reactor; when it is detected that the hydrogen content ≤ the set threshold a, control the hydrogen peroxide input valve to close through the control device, and stop adding hydrogen peroxide to the second reactor.

7. A method for producing nickel sulfate according to claim 6, characterized in that, The set threshold a is 10,000 ppm.

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