Reaction device for producing ferric trichloride and preparation method of ferric trichloride

Abstract

The invention provides a reaction device for producing ferric trichloride and a preparation method of the ferric trichloride, and the reaction device comprises a micro-nano bubble generation mechanism, an oxygen supply mechanism arranged on the micro-nano bubble generation mechanism, and a reaction kettle arranged on the micro-nano bubble generation mechanism, the micro-nano bubble generating mechanism is arranged at the top of the reaction kettle, the jet flow mechanism is arranged at the top of the reaction kettle and connected with the micro-nano bubble generating mechanism through a pipeline, oxygen is conveyed into the micro-nano bubble generator through the oxygen supply mechanism and converted into oxygen-enriched micro-nano bubbles, and then a part of stream containing the oxygen-enriched micro-nano bubbles is directly conveyed into the reaction kettle from the bottom of the reaction kettle; the other part of stream containing the oxygen-enriched micro-nano bubbles is conveyed into the reaction kettle from the top of the reaction kettle through the jet flow mechanism, and turbulent flow is formed in the reaction kettle, so that the contact area of oxygen and ferrous ions is increased, the heating speed of a reaction system is increased, the reaction is promoted to quickly reach a reaction end point, and the loss of a catalyst is reduced. The implementation cost is low, and popularization and implementation are convenient.

Description

Technical Field

[0001] The present application belongs to the technical field of industrial preparation of inorganic salts, and specifically relates to a reaction device for producing ferric chloride and a method for preparing ferric chloride. Background Art

[0002] In the prior art, the production of ferric chloride by catalytic oxidation of ferrous chloride with oxygen is an important chemical production process. This process usually uses oxygen as an oxidant and adds a suitable catalyst to accelerate the reaction rate. During the reaction, the ferrous chloride solution is fully contacted with oxygen in the reactor. Under the action of the catalyst, the ferrous ions Fe 2+ Oxidized to iron ions Fe 3+ , generating ferric chloride solution. Common catalysts include sodium nitrite, etc., which reduce the activation energy of the reaction through catalysis and improve the reaction efficiency.

[0003] In the prior art, oxygen is often transported into a ferrous chloride solution to convert ferrous ions Fe 2+ Oxidized to iron ion Fe 3+ , generating ferric chloride solution, but in the existing catalytic oxidation reaction equipment, oxygen reacts with ferrous ions Fe 2+ The contact area is small, the heat generated by the early reaction system itself is small, the reaction system heats up slowly, which is not conducive to the reaction reaching the end point quickly, the catalyst loss increases, the production efficiency is low, the production cost is high, the reaction time is too long, it is difficult to control the oxidation reaction process, and the ferrous ions Fe in the reaction system 2+ The risk of overoxidation is high, resulting in excessive production of nitrogen oxide pollutants during the reaction, which is not in line with the concept of green chemical production, so improvements are urgently needed. Summary of the invention

[0004] The present invention aims to solve the problem that in the prior art, in the process of preparing ferric chloride by catalytic oxidation, oxygen is used as a gas phase oxidant to react with the raw material ferrous chloride. In the actual reaction process, oxygen reacts with the ferrous ions Fe in the liquid phase. 2+ The contact area is small, the heat generated by the system itself in the early stage of the reaction is small, the reaction system heats up slowly, the reaction temperature is low, it is not conducive to the reaction to reach the end point quickly, the catalyst loss is increased, the production efficiency is low, and the production cost is high. A reaction device for producing ferric chloride is proposed.

[0005] In order to solve the technical problem proposed in this application, this application also proposes a preparation process of ferric chloride.

[0006] The present application adopts the following scheme: a reaction device for producing ferric chloride, comprising a micro-nano bubble generating mechanism, an oxygen supply mechanism arranged on the input end of the micro-nano bubble generating mechanism, a reactor arranged on the output end of the micro-nano bubble generating mechanism, and a jet mechanism arranged on the top of the reactor and connected to the pipeline of the micro-nano bubble generating mechanism, wherein the oxygen supply mechanism is used to transport oxygen to the micro-nano bubble generating mechanism, the micro-nano bubble generating mechanism is used to convert oxygen into oxygen-rich micro-nano bubbles, and the jet mechanism is used to inject a stream containing oxygen-rich micro-nano bubbles into the reactor, and the reactor is used to accommodate a ferrous chloride solution.

[0007] In some possible embodiments, a heating mechanism is further included between the oxygen supply mechanism and the micro-nano bubble generating mechanism, and the heating mechanism is used to heat liquid oxygen into gaseous oxygen.

[0008] In some possible embodiments, the jet mechanism includes a plurality of venturi ejectors disposed on the top of the reactor, and the venturi ejectors are used to absorb oxygen above the liquid surface of the ferrous chloride solution in the reactor and mix the oxygen-rich micro-nano bubbles with the ferrous chloride solution.

[0009] In some possible embodiments, a delivery pump group is further included between the micro-nano bubble generating mechanism and the plurality of the venturi ejectors, and the delivery pump group is used to deliver the oxygen-rich micro-nano bubbles to the venturi ejectors.

[0010] In some possible embodiments, the micro-nano bubble generating mechanism includes a shell, a bubble generating chamber provided on the shell, and an aeration tube provided in the bubble generating chamber. The shell is made of titanium, and the aeration tube is made of polytetrafluoroethylene. The aeration tube is used to disperse the gas phase and liquid phase in the bubble generating chamber to convert the oxygen input into the bubble generating chamber into oxygen-rich micro-nano bubbles.

[0011] In some possible embodiments, the particle size of the oxygen-rich micro-nano bubbles ranges from 0.05 μm to 0.3 μm.

[0012] In order to solve the technical problem raised in the present application, the present application also provides a preparation process of ferric chloride, which is prepared by using the above-mentioned reaction device for producing ferric chloride, comprising the following steps:

[0013] Initial mixing: injecting ferrous chloride solution raw material into the reactor, and simultaneously starting the micro-nano bubble generating mechanism to input the first stream A containing oxygen-rich micro-nano bubbles into the reactor from the bottom of the reactor;

[0014] Strong mixing preparation: Start the delivery pump group to deliver the oxygen-rich micro-nano bubble stream to the Venturi ejector located at the top of the reactor;

[0015] Strong mixing: Start the Venturi ejector to input the second stream B of oxygen-rich micro-nano bubbles into the reactor, and the first stream A and the second stream B collide in the reactor to form turbulence.

[0016] In some feasible embodiments, the initial mixing also includes delivering oxygen to the micro-nano bubble generating mechanism. During the oxygen delivery process, the oxygen temperature is heated to 100°C-300°C by electromagnetic induction heating. During the oxygen heating process, the temperature of the ferrous chloride solution raw material in the reactor is measured. When the temperature of the ferrous chloride solution raw material in the reactor reaches 60°C-65°C, the heating of the oxygen is stopped. The temperature range of the ferrous chloride solution in the reactor is 60°C-100°C.

[0017] In some feasible embodiments, in the strong mixing preparation, the volume of the reactor is defined as V1, the hourly circulation flow rate of the delivery pump group is defined as V2, and V1 and V2 satisfy the following relationship: 3≤V2 / V1≤5.

[0018] In some feasible embodiments, the operating pressure of the micro-nano bubble generating mechanism is 0.45 MPa-0.65 MPa; the Reynolds coefficient of the Venturi ejector is 1.5×10 5 ≤Re D ≤2×10 5 .

[0019] In some feasible embodiments, the flow rate of the venturi ejector nozzle is 130 m / s-145 m / s.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] The present application provides a reaction device for producing ferric chloride and a method for preparing ferric chloride, wherein the reaction device comprises a micro-nano bubble generating mechanism, an oxygen supply mechanism arranged on the input end of the micro-nano bubble generating mechanism, a reactor arranged on the output end of the micro-nano bubble generating mechanism, and a jet mechanism arranged on the top of the reactor and connected to the pipeline of the micro-nano bubble generating mechanism, wherein oxygen is transported to the micro-nano bubble generator through the oxygen supply mechanism, and after the oxygen is converted into oxygen-rich micro-nano bubbles, a part of the stream containing the oxygen-rich micro-nano bubbles is directly transported from the bottom of the reactor to the reactor, and another part of the stream containing the oxygen-rich micro-nano bubbles is transported from the top of the reactor to the reactor through the jet mechanism, thereby forming a turbulent flow system inside the reactor, increasing the contact area between oxygen and ferrous ions, and improving the heating rate of the reaction system, which is conducive to the reaction to quickly reach the reaction end point, reducing the loss of catalyst, and thus reducing the production cost, and has the advantages of high reaction efficiency, low implementation cost, and easy promotion and implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a reaction device for producing ferric chloride in the present application;

[0023] Figure 2 It is a structural schematic diagram of the micro-nano bubble generating mechanism of the present application;

[0024] Figure 3 Fe in Examples 1-3 and Comparative Examples 1-2 of the present application 3+ The concentration (C) of the reaction is plotted against the reaction time (T). DETAILED DESCRIPTION

[0025] Combination Figure 1-3 , Examples 1-3, and Comparative Examples 1-2 further illustrate the technical solutions provided by the present application.

[0026] like Figure 1 As shown, the present application provides a reaction device for producing ferric chloride, comprising a micro-nano bubble generating mechanism 1, an oxygen supply mechanism 2 arranged on the input end of the micro-nano bubble generating mechanism 1, a reactor 3 arranged on the output end of the micro-nano bubble generating mechanism 1, and a jet mechanism 4 arranged on the top of the reactor 3 and connected to the micro-nano bubble generating mechanism 1 through a pipeline, wherein the oxygen supply mechanism 2 is used to transport oxygen to the micro-nano bubble generating mechanism 1, the micro-nano bubble generating mechanism 1 is used to convert oxygen into oxygen-rich micro-nano bubbles, and the jet mechanism 4 is used to inject a stream containing oxygen-rich micro-nano bubbles into the reactor 3, and the reactor 3 is used to accommodate a ferrous chloride solution.

[0027] In the actual implementation process, a heating mechanism 6 is also included between the oxygen supply mechanism 2 and the micro-nano bubble generating mechanism 1, and the heating mechanism 6 is used to heat the liquid oxygen into gaseous oxygen.

[0028] In the actual implementation process, the heating mechanism uses an electromagnetic induction heating ring.

[0029] In actual implementation, the jet mechanism 4 includes a plurality of venturi ejectors 40 disposed on the top of the reactor 3. The venturi ejectors 40 are used to absorb oxygen above the liquid surface of the ferrous chloride solution in the reactor 3 and mix the oxygen-rich micro-nano bubbles with the ferrous chloride solution.

[0030] In the actual implementation process, a delivery pump group 5 is also included between the micro-nano bubble generating mechanism 1 and the venturi ejector 40 , and the delivery pump group 5 is used to deliver oxygen-rich micro-nano bubbles to the venturi ejector 40 .

[0031] In the actual implementation process, a reflux pipe is provided between the delivery pump group and the venturi ejector, and the reflux pipe is a disc-type reflux pipe to prolong the reaction time of the oxygen-rich micro-nano bubbles and the ferrous chloride raw material in the reactor.

[0032] In the actual implementation process, the micro-nano bubble generating mechanism 1 includes a shell 10, a bubble generating chamber 11 arranged on the shell 10, and an aeration tube 12 arranged in the bubble generating chamber 11. The shell 10 is made of titanium, and the aeration tube 12 is made of polytetrafluoroethylene. The aeration tube 12 is used to disperse the gas phase and liquid phase in the bubble generating chamber 11 to convert oxygen into oxygen-rich micro-nano bubbles.

[0033] Example 1

[0034] The preparation of ferric chloride comprises the following steps:

[0035] Step 101. Initial mixing: Add 10 ml 3 / h flow rate of 10% ferrous chloride solution raw material, according to the reaction requirements, hydrochloric acid is added in an equimolar ratio, and the micro-nano bubble generating mechanism is started while the ferrous chloride liquid solution raw material is injected, and the first stream A containing oxygen-rich micro-nano bubbles is input into the reactor from the bottom of the reactor. The flow rate of the first stream A is 20m 3 / h;

[0036] Wherein, step 101 also includes heating the temperature of oxygen to 100° C. by electromagnetic induction heating, measuring the temperature of the ferrous chloride solution raw material in the reactor during the oxygen heating process, and stopping heating the oxygen when the temperature of the ferrous chloride solution raw material in the reactor reaches 60° C.;

[0037] Wherein, the operating pressure of the micro-nano bubble generating mechanism in step 101 is 0.45 MPa;

[0038] Wherein, the median particle size of the oxygen-rich micro-nano bubbles in step 101 is 0.08 μm;

[0039] Step 102. Strong mixing preparation: start the delivery pump group to deliver the oxygen-rich micro-nano bubble stream to the venturi ejector located at the top of the reactor, wherein the volume of the reactor is V1 and the hourly circulation flow rate of the delivery pump group is V2, which satisfies: V2 / V1=3;

[0040] Step 103: Start the Venturi ejector to input the second stream B of oxygen-rich micro-nano bubbles into the reactor, and the first stream A and the second stream B collide in the reactor to form turbulence;

[0041] Among them, the Reynolds coefficient of the Venturi ejector is 1.5×10 5 ;

[0042] Among them, the mouth flow rate of the Venturi ejector is 130m / s.

[0043] Example 2

[0044] The preparation of ferric chloride comprises the following steps:

[0045] Step 101. Initial mixing: Add 15 ml 3 / h flow rate of 14% ferrous chloride solution raw material, according to the reaction requirements, hydrochloric acid is added in an equimolar ratio, and the micro-nano bubble generating mechanism is started while the ferrous chloride liquid solution raw material is injected, and the first stream A containing oxygen-rich micro-nano bubbles is input into the reactor from the bottom of the reactor. The flow rate of the first stream A is 30m 3 / h;

[0046] Wherein, step 101 also includes heating the temperature of oxygen to 200° C. by electromagnetic induction heating, measuring the temperature of the ferrous chloride solution raw material in the reactor during the oxygen heating process, and stopping heating the oxygen when the temperature of the ferrous chloride solution raw material in the reactor reaches 62° C.;

[0047] Wherein, the operating pressure of the micro-nano bubble generating mechanism in step 101 is 0.55 MPa;

[0048] Wherein, the median particle size of the oxygen-rich micro-nano bubbles in step 101 is 0.1 μm;

[0049] Step 102. Strong mixing preparation: start the delivery pump group to deliver the oxygen-rich micro-nano bubble stream to the venturi ejector located at the top of the reactor, wherein the volume of the reactor is V1 and the hourly circulation flow rate of the delivery pump group is V2, which satisfies: V2 / V1=4;

[0050] Step 103: Start the Venturi ejector to input the second stream B of oxygen-rich micro-nano bubbles into the reactor, and the first stream A and the second stream B collide in the reactor to form turbulence;

[0051] Among them, the Reynolds coefficient of the Venturi ejector is 1.8×10 5 ;

[0052] Among them, the mouth flow rate of the Venturi ejector is 140m / s.

[0053] Example 3

[0054] The preparation of ferric chloride comprises the following steps:

[0055] Step 101. Initial mixing: Add 20 ml 3 / h flow rate of 16% ferrous chloride solution raw material, according to the reaction requirements, hydrochloric acid is added in an equimolar ratio, and the micro-nano bubble generating mechanism is started while the ferrous chloride liquid solution raw material is injected, and the first stream A containing oxygen-rich micro-nano bubbles is input into the reactor from the bottom of the reactor. The flow rate of the first stream A is 40m 3 / h;

[0056] Wherein, step 101 also includes heating the temperature of oxygen to 300° C. by electromagnetic induction heating, measuring the temperature of the ferrous chloride solution raw material in the reactor during the oxygen heating process, and stopping heating the oxygen when the temperature of the ferrous chloride solution raw material in the reactor reaches 65° C.;

[0057] Wherein, the operating pressure of the micro-nano bubble generating mechanism in step 101 is 0.65 MPa;

[0058] Wherein, the particle size range of the oxygen-rich micro-nano bubbles in step 101 is 0.3 μm;

[0059] Step 102. Strong mixing preparation: start the delivery pump group to deliver the oxygen-rich micro-nano bubble stream to the venturi ejector located at the top of the reactor, wherein the volume of the reactor is V1 and the hourly circulation flow rate of the delivery pump group is V2, which satisfies: V2 / V1=5;

[0060] Step 103: Start the Venturi ejector to input the second stream B of oxygen-rich micro-nano bubbles into the reactor, and the first stream A and the second stream B collide in the reactor to form turbulence;

[0061] Among them, the Reynolds coefficient of the Venturi ejector is 2×10 5 ;

[0062] Among them, the mouth flow rate of the Venturi ejector is 145m / s.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 3 is that after the Venturi ejector is removed, only the micro-nano bubble generating mechanism at the bottom of the reactor is retained, and only the micro-nano bubble generator at the bottom of the reactor is used to transport the stream containing oxygen-rich micro-nano bubbles into the reactor.

[0065] Comparative Example 2

[0066] The difference between Comparative Example 2 and Example 3 is that after the micro-nano bubble generating mechanism at the bottom of the reactor is removed, only a plurality of venturi ejectors at the top of the reactor are retained, and the flow stream is transported into the reactor only through the venturi ejectors.

[0067] The following tests were performed during the preparation of ferric chloride in Example 1-3 and Comparative Example 1-2: the raw materials in the reactor were sampled every 5 minutes, and the iron ions Fe in the raw materials in the reactor were detected. 3+ concentration, and the reaction time (T) is used as the horizontal axis, and Fe 3+ The concentration (C) is the vertical coordinate for fitting Fe 3+ The concentration (C) of the reaction time (T) is plotted in Figure 2. The test results are shown in Figure 2. Figure 3 shown.

[0068] Depend on Figure 3 It can be seen that a reaction device for producing ferric chloride and a method for preparing ferric chloride are provided in Examples 1-3. A micro-nano bubble generating mechanism is arranged at the bottom of the reactor, and the oxygen-rich micro-nano bubbles generated by the micro-nano bubble generating mechanism are refluxed to the top of the reactor, and transported to the reactor through a venturi ejector. When the venturi ejector transports the stream containing oxygen-rich micro-nano bubbles into the reactor, the oxygen above the liquid surface of the coiled reactor is strongly mixed with the ferrous chloride solution raw material in the reactor. The stream at the top of the reactor will form turbulence in the reactor together with the stream at the bottom of the reactor, thereby significantly improving the residence time of the oxygen-rich micro-nano bubbles in the ferrous chloride solution raw material, increasing the contact area between oxygen and ferrous ions, and finally significantly improving the oxidation reaction efficiency, improving the heating rate of the reaction system, which is conducive to the reaction to quickly reach the reaction end point, reducing the loss of catalyst, so as to reduce the production cost.

[0069] In Comparative Example 1, after the Venturi ejector is removed, only the micro-nano bubble generating mechanism at the bottom of the reactor is retained. During the oxidation reaction, turbulence cannot be formed in the reactor, and the oxygen-rich micro-nano bubbles are input into the ferrous chloride solution raw material from the bottom of the reactor. The residence time of the oxygen-rich micro-nano bubbles in the ferrous chloride solution raw material is significantly reduced, and the contact area with the ferrous chloride solution raw material is reduced, thereby significantly reducing the oxidation reaction efficiency.

[0070] In Comparative Example 2, after the micro-nano bubble generating mechanism at the bottom of the reactor is removed, only a plurality of venturi ejectors at the top of the reactor are retained, and the venturi jet is wound through the air above the liquid surface of the reactor, and the stream with the air wound is input into the ferrous chloride solution raw material to realize the oxidation reaction of ferrous chloride. First, the content of oxygen-rich micro-nano bubbles in the stream generated by the venturi jet is reduced. Secondly, the particle size of the oxygen-rich micro-nano bubbles in the stream generated by the venturi jet is larger, and the contact area with the ferrous chloride solution raw material is smaller. Finally, only the venturi ejector is retained and turbulence cannot be formed in the reactor, and the residence time of the oxygen-rich micro-nano bubbles in the ferrous chloride solution raw material is significantly reduced, thereby significantly reducing the oxidation reaction efficiency.

[0071] The present application provides a reaction device for producing ferric chloride and a method for preparing ferric chloride, wherein the reaction device comprises a micro-nano bubble generating mechanism, an oxygen supply mechanism arranged on the input end of the micro-nano bubble generating mechanism, a reactor arranged on the output end of the micro-nano bubble generating mechanism, and a jet mechanism arranged on the top of the reactor and connected to the pipeline of the micro-nano bubble generating mechanism, wherein oxygen is transported to the micro-nano bubble generator through the oxygen supply mechanism, and after the oxygen is converted into oxygen-rich micro-nano bubbles, a part of the stream containing the oxygen-rich micro-nano bubbles is directly transported from the bottom of the reactor to the reactor, and another part of the stream containing the oxygen-rich micro-nano bubbles is transported from the top of the reactor to the reactor through the jet mechanism, thereby forming a turbulent flow system inside the reactor, increasing the contact area between oxygen and ferrous ions, and improving the heating rate of the reaction system, which is conducive to the reaction to quickly reach the reaction end point, reducing the loss of catalyst, and thus reducing the production cost, and has the advantages of high reaction efficiency, low implementation cost, and easy promotion and implementation.

[0072] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction device for producing ferric chloride, characterized in that, The invention comprises a micro-nano bubble generating mechanism (1), an oxygen supply mechanism (2) arranged at the input end of the micro-nano bubble generating mechanism (1), a reaction kettle (3) arranged at the output end of the micro-nano bubble generating mechanism (1), and a jet mechanism (4) arranged at the top of the reaction kettle (3) and connected to the pipeline of the micro-nano bubble generating mechanism (1), wherein the oxygen supply mechanism (2) is used to transport oxygen to the micro-nano bubble generating mechanism (1), the micro-nano bubble generating mechanism (1) is used to convert oxygen into oxygen-rich micro-nano bubbles, and the jet mechanism (4) is used to inject a stream containing oxygen-rich micro-nano bubbles into the reaction kettle (3), and the reaction kettle (3) is used to contain a ferrous chloride solution.

2. A reaction device for producing ferric chloride according to claim 1, characterized in that, It also comprises a heating mechanism (6) arranged between the oxygen supply mechanism (2) and the micro-nano bubble generating mechanism (1), wherein the heating mechanism (6) is used to heat liquid oxygen into gaseous oxygen.

3. A reaction device for producing ferric chloride according to claim 1, characterized in that, The jet mechanism (4) comprises a plurality of venturi ejectors (40) arranged on the top of the reactor (3), wherein the venturi ejectors (40) are used to absorb oxygen above the liquid surface of the ferrous chloride solution in the reactor (3) and to mix the oxygen-rich micro-nano bubbles with the ferrous chloride solution.

4. A reaction device for producing ferric chloride according to claim 3, characterized in that, It also includes a delivery pump group (5) arranged between the micro-nano bubble generating mechanism (1) and the venturi ejector (40), wherein the delivery pump group (5) is used to deliver oxygen-rich micro-nano bubbles to the venturi ejector (40).

5. A reaction device for producing ferric chloride according to claim 1, characterized in that, The micro-nano bubble generating mechanism (1) comprises a shell (10), a bubble generating chamber (11) arranged on the shell (10), and an aeration tube (12) arranged in the bubble generating chamber (11); the shell (10) is made of titanium, the aeration tube (12) is made of polytetrafluoroethylene, and the aeration tube (12) is used to disperse the gas phase and liquid phase in the bubble generating chamber (11) to convert oxygen into oxygen-rich micro-nano bubbles.

6. A reaction device for producing ferric chloride according to claim 1, characterized in that, The particle size of the oxygen-rich micro-nano bubbles ranges from 0.05 μm to 0.3 μm.

7. A process for preparing ferric chloride, using a reaction device for producing ferric chloride according to any one of claims 1 to 6, characterized in that: The following steps are involved: Initial mixing: injecting ferrous chloride solution raw material into the reactor, and simultaneously starting the micro-nano bubble generating mechanism to input the first stream A containing oxygen-rich micro-nano bubbles into the reactor from the bottom of the reactor; Strong mixing preparation: Start the delivery pump group to deliver the oxygen-rich micro-nano bubble stream to the Venturi ejector located at the top of the reactor; Strong mixing: Start the Venturi ejector to input the second stream B of oxygen-rich micro-nano bubbles into the reactor, and the first stream A and the second stream B collide in the reactor to form turbulence.

8. A process for preparing ferric chloride according to claim 7, characterized in that, in, The initial mixing also includes delivering oxygen to the micro-nano bubble generating mechanism. During the oxygen delivery process, the oxygen temperature is heated to 100°C-300°C by electromagnetic induction heating. During the oxygen heating process, the temperature of the ferrous chloride solution raw material in the reactor is measured. When the temperature of the ferrous chloride solution raw material in the reactor reaches 60°C-65°C, the heating of the oxygen is stopped. The temperature range of the ferrous chloride solution in the reactor is 60°C-100°C.

9. A process for preparing ferric chloride according to claim 7, characterized in that, in, In the strong mixing preparation, the volume of the reactor is defined as V1, and the circulation flow rate of the delivery pump group per hour is defined as V2. The V1 and V2 satisfy the following relationship: 3≤V2 / V1≤5.

10. A process for preparing ferric chloride according to claim 7, characterized in that: The operating pressure of the micro-nano bubble generating mechanism is 0.45MPa-0.65MPa; the Reynolds coefficient of the Venturi ejector is 1.5×10 5 ≤Re D ≤2×10 5 .

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