CN113398870A

CN113398870A - Preparation equipment of vulcanized zero-valent iron composite nano material

Info

Publication number: CN113398870A
Application number: CN202110848831.4A
Authority: CN
Inventors: 王伟; 张伟贤
Original assignee: Shanghai Ailun Beisi Environmental Technology Co ltd
Current assignee: Shanghai Ailun Beisi Environmental Technology Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-09-17
Anticipated expiration: 2041-07-27
Also published as: CN113398870B

Abstract

The application discloses preparation equipment of compound nano-material of zero-valent iron vulcanizes belongs to zero-valent iron vulcanizes technical field, including reation kettle, stirring structure, drip structure and control structure. The stirring structure is used for stirring the mixed solution in the reaction kettle, so that the ferric salt solution and the sulfide solution are mixed more uniformly to accelerate the reaction speed. The sulphide solution in this embodiment adopts the mode of adding dropwise to drop into the reation kettle, and the control structure is used for controlling the speed that the structure of dripping will sulphide solution drips into reation kettle. The preparation equipment of the zero-valent iron sulfide composite nano material disclosed by the invention is provided with a control structure for controlling the dropping speed of the dropping nozzle, and the dropping speed of the sulfide solution is adjusted according to the difference of the volume of the iron salt solution in the reaction kettle when the iron salt solution is vulcanized each time, so that the high vulcanizing speed of the zero-valent iron and the high quality of the obtained zero-valent iron sulfide material are ensured.

Description

Preparation equipment of vulcanized zero-valent iron composite nano material

Technical Field

The invention relates to the technical field of zero-valent iron sulfide, in particular to equipment for preparing a zero-valent iron sulfide composite nano material.

Background

In recent years, nano zero-valent iron particles are widely used for removing trichloroethylene in underground water due to the advantages of large specific surface area, high corrosion reaction speed, high cost benefit, environmental friendliness and the like. Researchers even improve the trichloroethylene removing capability by modifying the nano zero-valent iron, such as synthesizing a bimetallic material, coating the surface of the material, synthesizing a copolymer, adding calcium alginate and the like, and also add sulfide during the synthesis process of the nano zero-valent iron.

CN202010911917.2 discloses a sulfurized nano zero-valent iron, its preparation method and use, wherein a sulfurized nano zero-valent iron composite nano material can be obtained by dripping a sulfide solution into an iron salt solution, and the dripping speed is fixed at 180 drops/min, and the effect is optimal.

When the existing zero-valent iron sulfide material is manufactured, a sulfide solution is dripped into an iron salt solution at a fixed speed, but when the zero-valent iron sulfide material is manufactured each time, the volume of the iron salt solution is different, the sulfide solution is dripped at the same speed, the vulcanization speed and effect are different, and the quality of the obtained zero-valent iron sulfide material is different.

Disclosure of Invention

The invention discloses a preparation device of a vulcanized zero-valent iron composite nano material, which aims to solve the problems.

The technical scheme adopted by the invention for solving the technical problems is as follows:

based on the above purpose, the invention discloses a preparation device of a vulcanized zero-valent iron composite nano material, which comprises the following steps:

a reaction kettle;

the stirring structure is arranged on the reaction kettle;

the dripping structure comprises a dripping nozzle for dripping liquid into the reaction kettle; and

and the control structure is used for controlling the dropping speed of the dropping nozzle.

Optionally: the drip structure is including being used for control the control knob of the dropping liquid speed of drip nozzle, the control structure is used for control the knob is worked as when the knob rotates along first direction, the dropping liquid speed grow of drip nozzle.

Optionally: the control structure includes:

floating blocks;

the first end of the control rod is rotatably connected with the floating block; and

the rotating rod is rotatably connected with the reaction kettle, the first end of the rotating rod is connected with the second end of the control rod, and the second end of the rotating rod is connected with the knob;

when the floating block moves towards the top of the reaction kettle, the control rod drives the rotating rod and the knob to rotate along a first direction.

Optionally: the control structure further comprises a sliding rod, the sliding rod is connected with the floating block, and the sliding rod is connected with the reaction kettle in a sliding manner;

the control rod is connected with the rotating rod in a sliding mode.

Optionally: the first end of dwang is provided with the spout, the spout is followed radially running through of dwang the dwang, the control lever joint in the spout.

Optionally: be provided with connecting hole and spacing groove on reation kettle's the lateral wall, the connecting hole with the spacing groove intercommunication, the dwang is located in the connecting hole, just the dwang with be provided with the sealing layer between the reation kettle, the control lever joint in the spacing inslot.

Optionally: the water dripping structure further comprises a switch, the switch is located the knob deviates from one side of the floating block, the switch is located above the control rod, and when the control rod leaves the switch, the water dripping nozzle begins to face towards liquid dripped into the reaction kettle.

Optionally: the stirring structure includes:

the servo motor is arranged on the reaction kettle;

the stirring shaft is in transmission connection with the servo motor and is positioned in the reaction kettle; and

the stirring blade is arranged on the stirring shaft.

Optionally: the slide bar deviates from the one end of floating block with servo motor is connected, works as the floating block drives the slide bar orientation when reation kettle's top removes, servo motor control the slew velocity of (mixing) shaft increases.

Optionally: the floating block is spherical.

Compared with the prior art, the invention has the following beneficial effects:

the preparation equipment of the zero-valent iron sulfide composite nano material disclosed by the invention is provided with a control structure for controlling the dropping speed of the dropping nozzle, and the dropping speed of the sulfide solution is adjusted according to the difference of the volume of the iron salt solution in the reaction kettle when the iron salt solution is vulcanized each time, so that the high vulcanizing speed of the zero-valent iron and the high quality of the obtained zero-valent iron sulfide material are ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram of an apparatus for preparing a zero-valent iron sulfide composite nanomaterial, disclosed in the embodiment of the invention, in a first state;

FIG. 2 is a schematic diagram of an apparatus for preparing a zero-valent iron sulfide composite nanomaterial, disclosed by an embodiment of the invention, in a second state;

FIG. 3 shows a schematic view of a reaction vessel disclosed in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a stirring structure disclosed in the embodiments of the present invention;

FIG. 5 is a schematic diagram of a drip configuration as disclosed in an embodiment of the present invention;

FIG. 6 is a schematic diagram of a control structure disclosed in an embodiment of the present invention;

fig. 7 shows a schematic view of a swivelling lever as disclosed in an embodiment of the present invention.

In the figure:

110-a reaction kettle; 111-a reaction chamber; 112-a feed inlet; 113-a discharge port; 114-a limiting groove; 115-connecting hole; 116-drip holes; 117-first mounting hole; 118-a second mounting hole; 120-stirring structure; 121-a servo motor; 122-a stirring shaft; 123-stirring blades; 130-a drip structure; 131-a water tank; 132-a connecting tube; 133-a drip nozzle; 134-a switch; 135-turn knob; 140-a control structure; 141-floating blocks; 142-a control lever; 143-rotating rods; 1431-chute; 144-sliding bar.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as disclosed in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example (b):

referring to fig. 1 to 7, an embodiment of the present invention discloses a preparation apparatus for a zero-valent iron sulfide composite nanomaterial, which includes a reaction kettle 110, a stirring structure 120, a dripping structure 130, and a control structure 140. The reaction kettle 110 is used as a container, and the ferric salt solution and the sulfide solution can react in the reaction kettle 110, so as to obtain the nanometer zero-valent iron sulfide. The stirring structure 120 is used for stirring the mixed solution in the reaction kettle 110, so that the ferric salt solution and the sulfide solution are mixed more uniformly, and the reaction speed is increased. The sulfide solution in this embodiment is added into the reaction kettle 110 dropwise, and the control structure 140 is used to control the speed of the dripping structure 130 dripping the sulfide solution into the reaction kettle 110.

The preparation equipment for the zero-valent iron sulfide composite nanomaterial disclosed in the embodiment is provided with the control structure 140 for controlling the dropping speed of the dropping nozzle 133, and when the ferric salt solution is vulcanized at every time, the dropping speed of the sulfide solution is adjusted according to the difference of the volume of the ferric salt solution in the reaction kettle 110, so that the zero-valent iron is ensured to have a faster vulcanizing speed and the obtained zero-valent iron sulfide material has higher quality.

The reaction kettle 110 comprises a reaction cavity 111, a feed inlet 112, a discharge outlet 113, a limiting groove 114, a connecting hole 115, a dropping hole 116, a first mounting hole 117 and a second mounting hole 118, wherein the feed inlet 112, the discharge outlet 113, the limiting groove 114, the connecting hole 115, the dropping hole 116, the first mounting hole 117 and the second mounting hole 118 are all communicated with the reaction cavity 111. The feed inlet 112, the drip hole 116, the first mounting hole 117 and the second mounting hole 118 are disposed at the top of the reaction vessel 110, the discharge outlet 113 is disposed at the bottom of the reaction vessel 110, and the limiting groove 114 and the connecting hole 115 are disposed at the side wall of the reaction vessel 110. Ferric salt solution can be put into the reaction chamber 111 from the feeding hole 112, and the vulcanized nano zero-valent iron suspension after the reaction can flow out from the discharging hole 113 and enter the next flocculation precipitation process. The drip nozzle 133 of the drip structure 130 may be installed at the drip hole 116, and the stirring shaft 122 of the stirring structure 120 is installed at the first installation hole 117.

The stirring structure 120 includes a servo motor 121, a stirring shaft 122, and a stirring blade 123. The servo motor 121 is installed on the top of the reaction kettle 110, one end of the stirring shaft 122 is in transmission connection with the servo motor 121, the other end of the stirring shaft 122 penetrates through the first installation hole 117 and then extends into the reaction cavity 111, and the stirring blade 123 is installed on the part of the stirring shaft 122 located in the reaction cavity 111. The servo motor 121 drives the stirring shaft 122 and the stirring blade 123 to rotate, so as to stir the ferric salt solution and the sulfide solution in the reaction chamber 111, so that the mixing is more uniform.

When the mixed solution in the reaction chamber 111 is less, the stirring blade 123 only needs to rotate slowly, the mixed solution in the reaction chamber 111 can be driven to keep a faster rotating speed, when the mixed solution in the reaction kettle 110 is more, the stirring blade 123 is required to have a faster stirring speed, the mixed solution can be enabled to have a faster rotating speed, the rotating speed of the stirring shaft 122 and the stirring blade 123 can be controlled by the servo motor 121, and therefore, no matter how many the mixed solution in the reaction chamber 111 is, the mixed solution can be kept at a certain rotating speed, and the zero-valent iron can be better vulcanized.

The water dropping structure 130 includes a water tank 131, a knob 135, a connection pipe 132, a drip nozzle 133, and a switch 134. The water tank 131 is connected to the reaction kettle 110, one end of the connection pipe 132 is communicated with the water tank 131, and the other end of the connection pipe 132 is communicated with the drip nozzle 133 (the drip nozzle 133 is installed at the drip hole 116).

The knob 135 is installed at a sidewall of the water tank 131, and by rotating the knob 135, a dropping speed of the drop nozzle 133 may be changed, and referring to fig. 5, when the knob 135 is rotated in a first direction, the dropping speed of the drop nozzle 133 is increased, and when the knob 135 is rotated in a second direction opposite to the first direction, the dropping speed of the drop nozzle 133 is decreased.

The knob 135 may be used to change the dropping speed of the nozzle 133 by changing the water flow rate in the connection pipe 132 or changing the water pressure in the connection pipe 132. That is, a pressure control device or a flow control device may be provided between the knob 135 and the connection pipe 132 so that the dropping speed of the dropping nozzle 133 is changed when the knob 135 is rotated.

In this embodiment, referring to fig. 1, the clockwise direction in fig. 1 is taken as the first direction, and the counterclockwise direction in fig. 1 is taken as the second direction.

The switch 134 is used to control the opening and closing of the connection tube 132 or the drip nozzle 133. The switch 134 may be controlled by sliding, referring to fig. 1 and 5, when an object contacts the bottom of the switch 134 and pushes the switch 134 to move upward for a small distance, the switch 134 controls the connection pipe 132 or the dropping nozzle 133 to close, and at this time, the dropping nozzle 133 does not drop the sulfide solution into the reaction chamber 111. When the object at the bottom of the switch 134 is separated from the switch 134, the switch 134 moves downward under the control of the reset structure, and the dropping nozzle 133 or the connection pipe 132 is opened from the new state to the connected state, and at this time, the dropping nozzle 133 begins to drop the sulfide solution into the reaction chamber 111.

Of course, the sliding switch 134 is only one embodiment of the present embodiment, and in other embodiments, the switch 134 may be configured in other structures, and only when an object contacts the bottom of the switch 134, the switch 134 turns off the connection tube 132 or the drip nozzle 133, and when the object is separated from the switch 134, the connection tube 132 and the drip nozzle 133 are turned on again.

Referring to fig. 3, the limiting groove 114 penetrates through the sidewall of the reaction vessel 110 along the wall thickness direction of the sidewall of the reaction vessel 110, the connection hole 115 extends along the sidewall of the reaction vessel 110, one end of the connection hole 115 is communicated with the limiting groove 114, and the other end of the connection hole 115 extends to the end surface of the sidewall of the reaction vessel 110.

The control structure 140 includes a floating block 141, a control lever 142, and a rotating lever 143. The floating block 141 is positioned in the reaction chamber 111, the floating block 141 can float on the liquid level of the mixed solution, and the floating block 141 is spherical, so that the resistance to the rotating mixed solution can be reduced. The rotating rod 143 is installed in the connecting hole 115, the rotating rod 143 is rotatably connected with the reaction kettle 110, and a sealing layer is arranged between the rotating rod 143 and the reaction kettle 110. The first end of the rotating rod 143 is located in the limiting groove 114, the second end of the rotating rod 143 extends out of the connecting hole 115 and then is connected with the knob 135, and the knob 135 can rotate synchronously with the rotating rod 143. The first end of the control rod 142 is rotatably connected with the floating block 141, the second end of the control rod 142 passes through the limiting groove 114, and the part of the control rod 142, which is located in the limiting groove 114, is connected with the rotating rod 143, so that when the floating block 141 floats up and down, the control rod 142 can drive the rotating rod 143 to rotate, and further drive the knob 135 to rotate.

Specifically, referring to fig. 1, when the liquid level in the reaction chamber 111 rises, the floating block 141 moves toward the top of the reaction kettle 110, the first end of the control rod 142 tilts upward, the second end of the control rod 142 rotates downward, the control rod 142 drives the rotating rod 143 to rotate along the first direction, and meanwhile, the knob 135 also rotates along the first direction along with the rotating rod 143, and the dropping speed of the dropping nozzle 133 increases. Accordingly, when the liquid level in the reaction chamber 111 decreases, the second end of the control rod 142 tilts upward, which drives the rotating rod 143 and the knob 135 to rotate together in the second direction, and the dropping speed of the dropping nozzle 133 decreases.

It should be noted that each time the iron salt solution is not continuously added into the reaction chamber 111, the volume of the iron salt solution added into the reaction chamber 111 is different, and the above-mentioned "liquid level rising" and "liquid level falling" refer to the comparison between the current liquid level and the last liquid level.

Referring to fig. 1, the switch 134 is located on a side of the knob 135 facing away from the floating block 141, and the switch 134 is located above the control rod 142. In the initial stage of putting the iron salt solution, the liquid level in the reaction chamber 111 is at the bottom, the second end of the control rod 142 is tilted upwards and is abutted against the switch 134, at this time, the dripping nozzle 133 cannot drip the sulfide solution into the reaction chamber 111, and meanwhile, the switch 134 limits the control rod 142, so that the floating block 141 cannot sink infinitely, the floating block 141 is prevented from contacting the stirring blade 123, and the stirring blade 123 and the floating block 141 are protected; when the reaction chamber 111 is slightly and gradually raised, the floating block 141 is raised to move the second end of the control rod 142 away from the range of the switch 134, and the drip nozzle 133 starts to operate. In this embodiment, the position of the limiting groove 114 is set to be lower to ensure that the floating block 141 drives the limiting block to leave the range of the switch 134 after the iron salt solution is added each time.

Referring to fig. 1 and 3, the limiting groove 114 is not regular, which is to limit the angle of the control rod 142 through the limiting groove 114, on one hand, when the second end of the control rod 142 is tilted upwards, the pressure of the control rod 142 on the switch 134 can be reduced through the limitation of the limiting groove 114, so that the switch 134 is prevented from being damaged due to excessive pressure; on the other hand, when the iron salt solution is too much and the first end of the control rod 142 is tilted upwards, the limiting groove 114 can limit the rising height of the floating block 141, so as to avoid the collision between the floating block 141 and the reaction kettle 110 and further avoid the damage of the floating block 141.

When the stirring structure 120 drives the mixed solution to rotate, the liquid level of the mixed solution is in a state of higher outside and lower inside under the action of centripetal force. If the control rod 142 is fixedly connected to the rotating rod 143, the floating block 141 may approach the edge of the reaction kettle 110 when ascending, which may cause inaccurate measurement of the actual change of the liquid level of the mixed solution by the floating block 141, and thus the dropping speed of the dropping nozzle 133 may not be the optimal speed.

Therefore, a sliding rod 144 may be disposed on the top of the floating block 141, one end of the sliding rod 144 is connected to the floating block 141, the other end of the sliding rod 144 is clamped in the second mounting hole 118, and the sliding rod 144 is slidably connected to the reaction vessel 110. At this time, since the distance between the floating block 141 and the rotating rod 143 is changed when the floating block 141 floats up and down, the control rod 142 and the rotating rod 143 can be slidably connected to ensure that the floating block 141 can float normally.

Based on this, when the liquid level in the reaction chamber 111 rises, the floating block 141 approaches the top of the reaction vessel 110 vertically upward under the restriction of the sliding rod 144, and the first end of the control rod 142 moves leftward relative to the rotating rod 143 while tilting upward, and the distance between the end surface of the second end of the control rod 142 and the rotating rod 143 decreases.

Wherein, be provided with spout 1431 at the first end of dwang 143, spout 1431 runs through dwang 143 along the radial of dwang 143, and the control lever 142 joint is in spout 1431.

Since the position of the floating block 141 is vertically changed when the liquid level in the reaction chamber 111 is changed, and the rotation speeds of the mixed solutions at different liquid levels controlled by the servo motor 121 are the same, the height change amount of the floating block 141 is the actual change amount of the liquid level of the mixed solution in the reaction chamber 111.

Referring to fig. 3, in order to ensure that the sulfide solution dropped from the dropping nozzle 133 does not fall on the control rod 142, the dropping hole 116 and the second mounting hole 118 may be arranged in a staggered manner.

As a preferred embodiment of this embodiment, the sliding rod 144 is connected to the servo motor 121 through an intermediate connection member, so that when the sliding rod 144 moves upward, the servo motor 121 controls the rotation speed of the stirring shaft 122 to increase, and when the sliding rod 144 moves downward, the servo motor 121 controls the rotation speed of the stirring shaft 122 to decrease, thereby forming a fully automatic processing.

The preparation equipment of the vulcanized zero-valent iron composite nano material disclosed by the embodiment works as follows:

firstly, putting an iron salt solution into the reaction kettle 110, and as the liquid level of the iron salt solution rises in the reaction cavity 111, the floating block 141 drives the control rod 142 to leave the switch 134, at this time, the dripping nozzle 133 begins to drip a sulfide solution into the reaction cavity 111, and when the floating block 141 continues to rise, the speed of dripping the liquid into the reaction cavity 111 by the dripping nozzle 133 can be gradually increased; meanwhile, as the sliding rod 144 gradually rises, the servo motor 121 controls the rotation speed of the stirring shaft 122 to gradually increase to adapt to the gradually increased liquid.

The preparation equipment of the zero-valent iron sulfide composite nanomaterial disclosed in the embodiment can realize full-automatic control of the dripping speed of the sulfide solution and the stirring speed of the mixed solution, so that the preparation equipment of the zero-valent iron sulfide composite nanomaterial can be used for preparing the zero-valent iron sulfide material at the optimal dripping speed and stirring speed of the sulfide solution no matter how much ferric salt solution is put into the reaction kettle 110, and the high efficiency of the preparation and the high quality of the zero-valent iron sulfide material can be ensured.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The preparation equipment of the vulcanized zero-valent iron composite nano material is characterized by comprising the following steps:

a reaction kettle;

the stirring structure is arranged on the reaction kettle;

2. The apparatus for preparing a zero-valent iron sulfide composite nanomaterial according to claim 1, wherein the water dropping structure comprises a control knob for controlling a dropping speed of the nozzle, the control structure being configured to control the knob, the dropping speed of the nozzle becoming greater when the knob is rotated in a first direction.

3. The apparatus for preparing a zero-valent iron sulfide composite nanomaterial of claim 2, wherein the control structure comprises:

floating blocks;

4. The apparatus for preparing zero-valent iron sulfide composite nanomaterial according to claim 3, wherein the control structure further comprises a slide bar, the slide bar is connected with the floating block and is connected with the reaction kettle in a sliding manner;

the control rod is connected with the rotating rod in a sliding mode.

5. The apparatus for preparing a zero-valent iron sulfide composite nanomaterial according to claim 4, wherein a sliding groove is formed at a first end of the rotating rod, the sliding groove penetrates through the rotating rod along a radial direction of the rotating rod, and the control rod is clamped in the sliding groove.

6. The equipment for preparing the zero-valent iron sulfide composite nano material as claimed in claim 4, wherein a connecting hole and a limiting groove are arranged on the side wall of the reaction kettle, the connecting hole is communicated with the limiting groove, the rotating rod is positioned in the connecting hole, a sealing layer is arranged between the rotating rod and the reaction kettle, and the control rod is clamped in the limiting groove.

7. The apparatus for preparing zero-valent iron sulfide composite nanomaterial according to claim 4, wherein the dripping structure further comprises a switch located on a side of the knob facing away from the floating block and above the control lever, and when the control lever leaves the switch, the dripping nozzle starts to drip liquid into the reaction kettle.

8. The apparatus for preparing zero-valent iron sulfide composite nanomaterial according to claim 4, wherein the stirring structure comprises:

the servo motor is arranged on the reaction kettle;

the stirring blade is arranged on the stirring shaft.

9. The apparatus of claim 8, wherein an end of the slide bar facing away from the floating block is connected to the servo motor, and when the floating block drives the slide bar to move toward the top of the reaction kettle, the servo motor controls the rotation speed of the stirring shaft to increase.

10. The apparatus for preparing a zero-valent iron sulfide composite nanomaterial according to any one of claims 3 to 9, wherein the float is spherical.